Materiały źródłowe

• #1 Understanding Rett Syndrome | International Rett Syndrome Foundation

  https://www.rettsyndrome.org/about-rett-syndrome/understanding-rett-syndrome/

  Rett syndrome is a genetic disorder, caused by a spontaneous pathogenic variant or mutation in a gene called MECP2 that is located on the X chromosome. This gene is important for brain development and for activating and deactivating other gene functions. When the MECP2 gene does not function properly, it can cause issues throughout the entire body. […] These mutations usually occur spontaneously and are typically not inherited, making Rett syndrome a sporadic genetic condition. They result from random changes in the genetic code that happen around the time of conception. Importantly, these mutations are not caused by anything the parents did or didn’t do.

• #2 Causes of Rett SyndromeEnvelope icon

  https://rettsyndromenews.com/causes/

  Rett syndrome is a rare genetic disorder that mostly affects females. The disease is characterized by normal early development, followed by slowed growth and a loss of motor control. As the disease progresses, patients may display symptoms such as repetitive motions, difficulty walking, and seizures. […] Almost all cases of Rett syndrome are caused by mutations in the MECP2 (methyl CpG binding protein 2) gene, which provides instructions for making a protein of the same name. […] The MeCP2 protein is involved in regulating the activity of other genes by modifying the structure of chromatin, the bundle of protein and DNA that makes up chromosomes. […] Scientists have identified mutations in the CDKL5 and FOXG1 genes in individuals who have atypical or congenital Rett syndrome, but it is not yet clear how these mutations cause the disease.

• #3 What Is Rett Syndrome?Envelope icon

  https://rettsyndromenews.com/what-is-rett-syndrome/

  Rett syndrome is a rare neurodevelopmental disorder that almost exclusively affects girls. It is estimated to occur in nearly one of every 10,000 female births. […] About 90–95% of Rett syndrome cases are caused by a mutation, or a change in DNA, in the MECP2 gene, which provides instructions to make the MECP2 protein. This protein regulates the activity of other genes by switching them on or off, and plays a critical role in brain development and function. […] More than 200 mutations have been identified in the MECP2 gene. In most cases, mutations in this gene occur spontaneously, which means they occur randomly. Rett syndrome can be inherited, but this is very rare — in fact occurring in less than 1% of cases. […] The specific type of mutation in MECP2 is thought to affect disease severity. […] Apart from the MECP2 gene, mutations in the CDKL5 or FOXG1 gene also have been linked to Rett syndrome. However, those mutations cause atypical types of the disease.

• #4 Rett Syndrome | National Institute of Neurological Disorders and Stroke

  https://www.ninds.nih.gov/health-information/disorders/rett-syndrome

  Nearly all cases of Rett syndrome are caused by a mutation in the methyl CpG binding protein 2, or MECP2 (pronounced meck-pea-two) gene. The MECP2 gene contains instructions for the synthesis of a protein called methyl cytosine binding protein 2 (MeCP2), which is needed for brain development and acts as one of the many biochemical switches that activate and deactivate gene functions. Because the MECP2 gene does not function properly in individuals with Rett syndrome, they may have too little MeCP2, or the MeCP2 they do have doesn’t work properly. […] Not everyone who has an MECP2 mutation has Rett syndrome. Scientists believe some cases may be caused by partial gene deletions, mutations in other parts of the MECP2 gene, or additional genes that have not yet been identified. Genetic and environmental factors can contribute to differences in the severity and types of symptoms found in individuals with Rett syndrome. Those may include: where the MECP2 mutation is located in the gene, how the individuals sex chromosomes interact, and other genes can make the symptoms worse or protect from the effects of the mutation.

• #5 Understanding Rett Syndrome | International Rett Syndrome Foundation

  https://www.rettsyndrome.org/about-rett-syndrome/understanding-rett-syndrome/

  Rett syndrome is a genetic disorder, caused by a spontaneous pathogenic variant or mutation in a gene called MECP2 that is located on the X chromosome. This gene is important for brain development and for activating and deactivating other gene functions. When the MECP2 gene does not function properly, it can cause issues throughout the entire body. […] These mutations usually occur spontaneously and are typically not inherited, making Rett syndrome a sporadic genetic condition. They result from random changes in the genetic code that happen around the time of conception. Importantly, these mutations are not caused by anything the parents did or didn’t do.

• #6 Rett Syndrome | Boston Children’s Hospital

  https://www.childrenshospital.org/conditions/rett-syndrome

  Rett syndrome results from disease-causing changes in the MECP2 gene located on the long arm of the X chromosome. This gene produces a protein called methyl-CpG binding protein 2, which is important for brain development and is believed to be involved in controlling the function of other genes. This protein is essential for the proper function of nerve cells and communication between neurons (brain cells). The specific job of the protein is not yet well understood. However, harmful changes in the gene lead to the symptoms of Rett syndrome. […] Rett syndrome most often occurs as a result of a sporadic, or newly occurring, change in the MECP2 gene that was not inherited from the child’s parents.

• #7 Causes of Rett SyndromeEnvelope icon

  https://rettsyndromenews.com/causes/

  Rett syndrome is a rare genetic disorder that mostly affects females. The disease is characterized by normal early development, followed by slowed growth and a loss of motor control. As the disease progresses, patients may display symptoms such as repetitive motions, difficulty walking, and seizures. […] Almost all cases of Rett syndrome are caused by mutations in the MECP2 (methyl CpG binding protein 2) gene, which provides instructions for making a protein of the same name. […] The MeCP2 protein is involved in regulating the activity of other genes by modifying the structure of chromatin, the bundle of protein and DNA that makes up chromosomes. […] Scientists have identified mutations in the CDKL5 and FOXG1 genes in individuals who have atypical or congenital Rett syndrome, but it is not yet clear how these mutations cause the disease.

• #8 Rett syndrome: MedlinePlus GeneticsLock

  https://medlineplus.gov/genetics/condition/rett-syndrome/

  Rett syndrome is part of a spectrum of disorders with the same genetic cause. Other disorders on the spectrum include PPM-X syndrome, MECP2 duplication syndrome, and MECP2-related severe neonatal encephalopathy. These other conditions can affect males. […] Mutations in a gene called MECP2 underlie almost all cases of classic Rett syndrome and some variant forms of the condition. This gene provides instructions for making a protein (MeCP2) that is critical for normal brain function. […] The MeCP2 protein is thought to help regulate the activity of genes in the brain. This protein may also control the production of different versions of certain proteins in brain cells. Mutations in the MECP2 gene alter the MeCP2 protein or result in the production of less protein, which appears to disrupt the normal function of neurons and other cells in the brain.

• #9 Rett Syndrome | Boston Children’s Hospital

  https://www.childrenshospital.org/conditions/rett-syndrome

  Rett syndrome results from disease-causing changes in the MECP2 gene located on the long arm of the X chromosome. This gene produces a protein called methyl-CpG binding protein 2, which is important for brain development and is believed to be involved in controlling the function of other genes. This protein is essential for the proper function of nerve cells and communication between neurons (brain cells). The specific job of the protein is not yet well understood. However, harmful changes in the gene lead to the symptoms of Rett syndrome. […] Rett syndrome most often occurs as a result of a sporadic, or newly occurring, change in the MECP2 gene that was not inherited from the child’s parents.

• #10 Rett Syndrome | National Institute of Neurological Disorders and Stroke

  https://www.ninds.nih.gov/health-information/disorders/rett-syndrome

  Nearly all cases of Rett syndrome are caused by a mutation in the methyl CpG binding protein 2, or MECP2 (pronounced meck-pea-two) gene. The MECP2 gene contains instructions for the synthesis of a protein called methyl cytosine binding protein 2 (MeCP2), which is needed for brain development and acts as one of the many biochemical switches that activate and deactivate gene functions. Because the MECP2 gene does not function properly in individuals with Rett syndrome, they may have too little MeCP2, or the MeCP2 they do have doesn’t work properly. […] Not everyone who has an MECP2 mutation has Rett syndrome. Scientists believe some cases may be caused by partial gene deletions, mutations in other parts of the MECP2 gene, or additional genes that have not yet been identified. Genetic and environmental factors can contribute to differences in the severity and types of symptoms found in individuals with Rett syndrome. Those may include: where the MECP2 mutation is located in the gene, how the individuals sex chromosomes interact, and other genes can make the symptoms worse or protect from the effects of the mutation.

• #11 What are the causes of Rett syndrome?

  https://www.medicalnewstoday.com/articles/what-causes-rett-syndrome

  Rett syndrome is a rare genetic condition. It occurs from genetic variations on the X chromosome that happen in the early stages of fetal development. […] Genetic variations on the X chromosome cause Rett syndrome, which is why it is more common in females. Females usually have two X chromosomes. […] Most cases of Rett syndrome occur due to a variation in the methyl CpG binding protein 2, or MECP2 gene. This gene contains the instructions for producing a protein necessary for brain development. It has the role of activating or deactivating gene functions during fetal development. […] Alterations in the MECP2 gene cause it to either produce insufficient amounts of the protein or a protein that the body cannot use. Due to these changes, the protein cannot help the brain develop normally, resulting in Rett syndrome.

• #12 What Is Rett Syndrome?Envelope icon

  https://rettsyndromenews.com/what-is-rett-syndrome/

  Rett syndrome is a rare neurodevelopmental disorder that almost exclusively affects girls. It is estimated to occur in nearly one of every 10,000 female births. […] About 90–95% of Rett syndrome cases are caused by a mutation, or a change in DNA, in the MECP2 gene, which provides instructions to make the MECP2 protein. This protein regulates the activity of other genes by switching them on or off, and plays a critical role in brain development and function. […] More than 200 mutations have been identified in the MECP2 gene. In most cases, mutations in this gene occur spontaneously, which means they occur randomly. Rett syndrome can be inherited, but this is very rare — in fact occurring in less than 1% of cases. […] The specific type of mutation in MECP2 is thought to affect disease severity. […] Apart from the MECP2 gene, mutations in the CDKL5 or FOXG1 gene also have been linked to Rett syndrome. However, those mutations cause atypical types of the disease.

• #13 The Causes of Rett Syndrome

  https://www.mastermindbehavior.com/post/rett-syndrome-causes

  Rett Syndrome is a rare genetic neurological disorder that primarily affects females. It occurs in about 1 in every 10,000 female births worldwide and is even rarer in boys. […] Nearly all cases of Rett Syndrome are caused by a mutation in the methyl CpG binding protein 2, or MECP2 gene. The MECP2 gene contains instructions for the synthesis of a protein called methyl cytosine binding protein 2 (MeCP2), which is vital for brain development and acts as one of the many biochemical switches that activate and deactivate gene functions. […] More than 900 different mutations have been found on the MECP2 gene, most located in eight different „hot spots.” A pathogenic mutation in the MECP2 gene leads to impaired MECP2 function, resulting in reduced production of Brain Derived Neurotrophic Factor (BDNF), a protein crucial for normal neuronal development.

• #14 Rett Syndrome – Pediatrics – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/pediatrics/congenital-neurologic-anomalies/rett-syndrome

  Rett syndrome is usually caused by a mutation in the methyl CpG binding protein 2 (MECP2) gene that results in its abnormal function. […] Rett syndrome is not always caused by an MECP2 mutation but may be caused by partial gene deletions, mutations in other genes (eg, CDKL5 and FOXG1 genes) that affect brain development in atypical Rett syndrome, mutations in other parts of the MECP2 gene, and possibly other genes that have not yet been identified.

• #15 Rett Syndrome: Causes and Treatment Options | Sunray ABA

  https://www.sunrayaba.com/post/rett-syndrome-causes-and-treatment-options

  Rett syndrome is predominantly caused by mutations in the methyl-CpG-binding protein 2 (MECP2) gene, located on the X chromosome. Nearly all cases (approximately 95%) are caused by mutations in the MECP2 gene. […] Over 200 different mutations in the MECP2 gene have been identified in people with Rett syndrome. The most common types include: Missense mutations (30-35%): Change a single amino acid in the protein, Nonsense mutations (35-40%): Create a premature stop signal, producing a shortened protein, Deletions or insertions (10-15%): Remove or add DNA segments, disrupting the protein’s structure, Large deletions (5-10%): Remove substantial portions of the gene. […] While MECP2 mutations account for approximately 95% of classic Rett syndrome cases, mutations in other genes can cause Rett-like conditions: CDKL5: Associated with an early-onset seizure variant of Rett syndrome, FOXG1: Associated with the congenital variant of Rett syndrome, CTNNB1: Can cause a neurodevelopmental disorder with some features similar to Rett syndrome.

• #16 Rett Syndrome: Practice Essentials, Background, Pathophysiology and Etiology

  https://emedicine.medscape.com/article/916377-overview

  Rett syndrome (RS) is related to various mutations on the MECP2 gene, which codes for methyl-CpG binding protein-2 (MECP2). […] The specific mutation on the gene related to RS (methyl-CpG binding protein-2 [MECP2]) was identified late in 1999. […] The mutations that cause RS are almost all sporadic. In families with a girl who has RS, the increased risk of having a second girl with the syndrome is reportedly less than 0.4%. However, recurrence in families can occur through mechanisms such as germline mosaicism. […] About 70% of RS cases are due to 4 missense mutations (ie, R106W, R133C, T158M, R306C) and 4 nonsense protein-truncating mutations (ie, R168X, R255X, R270X, R294X), which are large deletions that cause significant gene destruction, resulting in greater severity. […] RS is the first human disease determined to be caused by defects in a protein that regulates gene expression through interaction with methylated DNA.

• #17 Rett syndrome – biological pathways leading from MECP2 to disorder phenotypes | Orphanet Journal of Rare Diseases | Full Text

  https://ojrd.biomedcentral.com/articles/10.1186/s13023-016-0545-5

  At the moment, several hundred different mutations have been reported leading to RTT by loss or impaired function of MECP2 protein due to truncation, abnormal folding, or binding instability. […] This contributes to the variety of RTT phenotype and symptom severity. […] The effects of total absence of MECP2 protein were investigated in several model systems. […] In another mouse model, silencing MECP2 in GABAergic neurons led to severe RTT like phenotype. […] Sixty-seven percent of all MECP2 mutations found in humans are in eight hot spots: R106, R133, T158, R168, R255, R270, R294 and R306. […] Most of the mutations which cause RTT occur in the MDB region of MECP2. […] The examination and investigation of RTT females (and model systems) revealed that an impaired MECP2 influences biological pathways on many levels.

• #18 Rett Syndrome: Practice Essentials, Background, Pathophysiology and Etiology

  https://emedicine.medscape.com/article/916377-overview

  Rett syndrome (RS) is related to various mutations on the MECP2 gene, which codes for methyl-CpG binding protein-2 (MECP2). […] The specific mutation on the gene related to RS (methyl-CpG binding protein-2 [MECP2]) was identified late in 1999. […] The mutations that cause RS are almost all sporadic. In families with a girl who has RS, the increased risk of having a second girl with the syndrome is reportedly less than 0.4%. However, recurrence in families can occur through mechanisms such as germline mosaicism. […] About 70% of RS cases are due to 4 missense mutations (ie, R106W, R133C, T158M, R306C) and 4 nonsense protein-truncating mutations (ie, R168X, R255X, R270X, R294X), which are large deletions that cause significant gene destruction, resulting in greater severity. […] RS is the first human disease determined to be caused by defects in a protein that regulates gene expression through interaction with methylated DNA.

• #19 Rett Syndrome | National Institute of Neurological Disorders and Stroke

  https://www.ninds.nih.gov/health-information/disorders/rett-syndrome

  Although Rett syndrome is a genetic disorder, less than 1% of recorded cases are passed from one generation to the next. Most cases are spontaneous, which means the mutation occurs randomly. However, in some families of individuals affected by Rett syndrome, other family members have a mutation in the MECP2 gene. Families that already have an identified MECP2 mutation can get genetic testing to identify if they are carriers of the disorder. […] Some researchers suggest that the specific type of mutation in the MECP2 gene affects the severity of symptoms of Rett syndrome. Studies are underway to understand the mutations and genes contribute to the varied symptoms and severity of this disorder. […] Researchers also are trying to find other genes that may be involved in Rett syndrome. Some studies have helped to narrow the search for these genes, but much is still unknown about how these genes may cause or contribute to the disorder.

• #20 Rett Syndrome: Practice Essentials, Background, Pathophysiology and Etiology

  https://emedicine.medscape.com/article/916377-overview

  Rett syndrome (RS) is related to various mutations on the MECP2 gene, which codes for methyl-CpG binding protein-2 (MECP2). […] The specific mutation on the gene related to RS (methyl-CpG binding protein-2 [MECP2]) was identified late in 1999. […] The mutations that cause RS are almost all sporadic. In families with a girl who has RS, the increased risk of having a second girl with the syndrome is reportedly less than 0.4%. However, recurrence in families can occur through mechanisms such as germline mosaicism. […] About 70% of RS cases are due to 4 missense mutations (ie, R106W, R133C, T158M, R306C) and 4 nonsense protein-truncating mutations (ie, R168X, R255X, R270X, R294X), which are large deletions that cause significant gene destruction, resulting in greater severity. […] RS is the first human disease determined to be caused by defects in a protein that regulates gene expression through interaction with methylated DNA.

• #21 Understanding Rett Syndrome | International Rett Syndrome Foundation

  https://www.rettsyndrome.org/about-rett-syndrome/understanding-rett-syndrome/

  Rett syndrome is a genetic disorder, caused by a spontaneous pathogenic variant or mutation in a gene called MECP2 that is located on the X chromosome. This gene is important for brain development and for activating and deactivating other gene functions. When the MECP2 gene does not function properly, it can cause issues throughout the entire body. […] These mutations usually occur spontaneously and are typically not inherited, making Rett syndrome a sporadic genetic condition. They result from random changes in the genetic code that happen around the time of conception. Importantly, these mutations are not caused by anything the parents did or didn’t do.

• #22 Rett syndrome

  https://www.nhs.uk/conditions/rett-syndrome/

  Rett syndrome is a rare genetic disorder that affects brain development, resulting in severe mental and physical disability. […] Almost all cases of Rett syndrome are caused by a mutation (a change in the DNA) in the MECP2 gene, which is found on the X chromosome (one of the sex chromosomes). […] The MECP2 gene contains instructions for producing a particular protein (MeCP2), which is needed for brain development. The gene abnormality prevents nerve cells in the brain from working properly. […] There’s usually no family history of Rett syndrome, which means it’s not passed on from one generation to the next. Almost all cases (over 99%) are spontaneous, with the mutation occurring randomly.

• #23 Rett syndrome: MedlinePlus GeneticsLock

  https://medlineplus.gov/genetics/condition/rett-syndrome/

  Several conditions with signs and symptoms overlapping those of Rett syndrome have been found to result from mutations in other genes. These conditions, including FOXG1 syndrome and CDKL5 deficiency disorder, were previously thought to be variant forms of Rett syndrome. However, doctors and researchers have identified some important differences between the conditions, so they are now usually considered to be separate disorders. […] In more than 99 percent of people with Rett syndrome, there is no history of the disorder in their family. Many of these cases result from new mutations in the MECP2 gene. […] A few families with more than one affected family member have been described. These cases helped researchers determine that classic Rett syndrome and variants caused by MECP2 gene mutations have an X-linked dominant pattern of inheritance.

• #24 Rett Syndrome: Practice Essentials, Background, Pathophysiology and Etiology

  https://emedicine.medscape.com/article/916377-overview

  Rett syndrome (RS) is related to various mutations on the MECP2 gene, which codes for methyl-CpG binding protein-2 (MECP2). […] The specific mutation on the gene related to RS (methyl-CpG binding protein-2 [MECP2]) was identified late in 1999. […] The mutations that cause RS are almost all sporadic. In families with a girl who has RS, the increased risk of having a second girl with the syndrome is reportedly less than 0.4%. However, recurrence in families can occur through mechanisms such as germline mosaicism. […] About 70% of RS cases are due to 4 missense mutations (ie, R106W, R133C, T158M, R306C) and 4 nonsense protein-truncating mutations (ie, R168X, R255X, R270X, R294X), which are large deletions that cause significant gene destruction, resulting in greater severity. […] RS is the first human disease determined to be caused by defects in a protein that regulates gene expression through interaction with methylated DNA.

• #25 Rett Syndrome in Children | UMass Memorial Health

  https://www.ummhealth.org/health-library/rett-syndrome-in-children

  Rett syndrome is caused by changes (mutations) in a gene called MECP2. This gene makes a protein thats believed to control the functions of many other genes. It also has a key role in brain development. When there is less of the MECP2 protein, parts of the brain cant develop correctly. […] Rett syndrome is a genetic disorder, but its rarely passed down from parents to children. Instead, the gene mutation occurs randomly. So the risk of having more than one child with this condition is very smallless than 1 in 100.

• #26 Rett Syndrome – Child Neurology Foundation

  https://www.childneurologyfoundation.org/disorder/rett-syndrome/

  Rett syndrome (RTT) is a rare neurodevelopmental disorder that mostly affects girls. It is one of the most common genetic causes of intellectual disability. RTT is due to a difference in the MECP2 gene, which is important for the development of the brain. This gene is located on the X chromosome. […] We do not know why some children’s MECP2 gene changes, causing RTT. These changes occur randomly. As far as we know, neither the child or mother getting sick, being emotionally stressed, or being exposed to substances in the environment can cause RTT. […] The change to the MECP2 gene is spontaneous, meaning that it is not inherited from the child’s mother or the father. This means that if you have one child with RTT, your other children are not at a higher risk of having RTT, nor are their children.

• #27 Rett syndrome: MedlinePlus GeneticsLock

  https://medlineplus.gov/genetics/condition/rett-syndrome/

  Several conditions with signs and symptoms overlapping those of Rett syndrome have been found to result from mutations in other genes. These conditions, including FOXG1 syndrome and CDKL5 deficiency disorder, were previously thought to be variant forms of Rett syndrome. However, doctors and researchers have identified some important differences between the conditions, so they are now usually considered to be separate disorders. […] In more than 99 percent of people with Rett syndrome, there is no history of the disorder in their family. Many of these cases result from new mutations in the MECP2 gene. […] A few families with more than one affected family member have been described. These cases helped researchers determine that classic Rett syndrome and variants caused by MECP2 gene mutations have an X-linked dominant pattern of inheritance.

• #28 Causes of Rett SyndromeEnvelope icon

  https://rettsyndromenews.com/causes/

  Although Rett syndrome is a genetic disease, less than 1% of cases are inherited. The remainder of cases are caused by de novo (new) mutations. […] The MECP2 gene is located on the X-chromosome, which is one of the chromosomes whose inheritance helps determine biological sex. […] By contrast, males have only one X-chromosome, so if they inherit a mutant version of MECP2 they do not have a working copy of the gene. Without a functional version of MECP2, boys typically do not survive early infancy. […] Yet, there are a few reported cases of males with Rett syndrome. These individuals have one of the rarer mutations that causes the disease, and may reach adulthood.

• #29 Glossary & FAQs | International Rett Syndrome Foundation

  https://www.rettsyndrome.org/about-rett-syndrome/glossary-and-faqs/

  Rett syndrome is a genetic disorder. It is caused by a spontaneous pathogenic variant or mutation on a gene called MECP2 that is located on the X chromosome in 96% of clinically diagnosed individuals. […] Rett syndrome is not considered to be inherited. The MECP2 variant is currently believed to be de novo, passed from parent to child in less than 1% of recorded cases. […] In Rett syndrome, mutations in the MECP2 gene disrupt normal brain development, leading to the condition’s symptoms. […] A treatment approach that aims to correct or replace faulty genes responsible for a disease. In Rett syndrome, gene therapy research focuses on restoring or compensating for the function of the MECP2 gene, with the goal of reducing symptoms or reversing the condition’s effects.

• #30 Rett Syndrome: Practice Essentials, Background, Pathophysiology and Etiology

  https://emedicine.medscape.com/article/916377-overview

  Rett syndrome (RS) is related to various mutations on the MECP2 gene, which codes for methyl-CpG binding protein-2 (MECP2). […] The specific mutation on the gene related to RS (methyl-CpG binding protein-2 [MECP2]) was identified late in 1999. […] The mutations that cause RS are almost all sporadic. In families with a girl who has RS, the increased risk of having a second girl with the syndrome is reportedly less than 0.4%. However, recurrence in families can occur through mechanisms such as germline mosaicism. […] About 70% of RS cases are due to 4 missense mutations (ie, R106W, R133C, T158M, R306C) and 4 nonsense protein-truncating mutations (ie, R168X, R255X, R270X, R294X), which are large deletions that cause significant gene destruction, resulting in greater severity. […] RS is the first human disease determined to be caused by defects in a protein that regulates gene expression through interaction with methylated DNA.

• #31 Rett Syndrome in Children | UMass Memorial Health

  https://www.ummhealth.org/health-library/rett-syndrome-in-children

  Rett syndrome is caused by changes (mutations) in a gene called MECP2. This gene makes a protein thats believed to control the functions of many other genes. It also has a key role in brain development. When there is less of the MECP2 protein, parts of the brain cant develop correctly. […] Rett syndrome is a genetic disorder, but its rarely passed down from parents to children. Instead, the gene mutation occurs randomly. So the risk of having more than one child with this condition is very smallless than 1 in 100.

• #32 Rett Syndrome | National Institute of Neurological Disorders and Stroke

  https://www.ninds.nih.gov/health-information/disorders/rett-syndrome

  Although Rett syndrome is a genetic disorder, less than 1% of recorded cases are passed from one generation to the next. Most cases are spontaneous, which means the mutation occurs randomly. However, in some families of individuals affected by Rett syndrome, other family members have a mutation in the MECP2 gene. Families that already have an identified MECP2 mutation can get genetic testing to identify if they are carriers of the disorder. […] Some researchers suggest that the specific type of mutation in the MECP2 gene affects the severity of symptoms of Rett syndrome. Studies are underway to understand the mutations and genes contribute to the varied symptoms and severity of this disorder. […] Researchers also are trying to find other genes that may be involved in Rett syndrome. Some studies have helped to narrow the search for these genes, but much is still unknown about how these genes may cause or contribute to the disorder.

• #33 What Is Rett Syndrome?Envelope icon

  https://rettsyndromenews.com/what-is-rett-syndrome/

  Rett syndrome is a rare neurodevelopmental disorder that almost exclusively affects girls. It is estimated to occur in nearly one of every 10,000 female births. […] About 90–95% of Rett syndrome cases are caused by a mutation, or a change in DNA, in the MECP2 gene, which provides instructions to make the MECP2 protein. This protein regulates the activity of other genes by switching them on or off, and plays a critical role in brain development and function. […] More than 200 mutations have been identified in the MECP2 gene. In most cases, mutations in this gene occur spontaneously, which means they occur randomly. Rett syndrome can be inherited, but this is very rare — in fact occurring in less than 1% of cases. […] The specific type of mutation in MECP2 is thought to affect disease severity. […] Apart from the MECP2 gene, mutations in the CDKL5 or FOXG1 gene also have been linked to Rett syndrome. However, those mutations cause atypical types of the disease.

• #34 Rett syndrome Information | Mount Sinai – New York

  https://www.mountsinai.org/health-library/diseases-conditions/rett-syndrome

  Rett syndrome (RTT) is a disorder of the nervous system. This condition leads to developmental problems in children. It mostly affects language skills and hand use. […] Most RTT cases are due to a problem in the gene called MECP2. This gene is on the X chromosome. Females have 2 X chromosomes. Even when one chromosome has this defect, the other X chromosome is normal enough for the child to survive. […] Males born with this defective gene do not have a second X chromosome to make up for the problem. Therefore, the defect usually results in miscarriage, stillbirth, or very early death.

• #35 What are the causes of Rett syndrome?

  https://www.medicalnewstoday.com/articles/what-causes-rett-syndrome

  Rett syndrome is a rare genetic condition. It occurs from genetic variations on the X chromosome that happen in the early stages of fetal development. […] Genetic variations on the X chromosome cause Rett syndrome, which is why it is more common in females. Females usually have two X chromosomes. […] Most cases of Rett syndrome occur due to a variation in the methyl CpG binding protein 2, or MECP2 gene. This gene contains the instructions for producing a protein necessary for brain development. It has the role of activating or deactivating gene functions during fetal development. […] Alterations in the MECP2 gene cause it to either produce insufficient amounts of the protein or a protein that the body cannot use. Due to these changes, the protein cannot help the brain develop normally, resulting in Rett syndrome.

• #36 Causes of Rett SyndromeEnvelope icon

  https://rettsyndromenews.com/causes/

  Although Rett syndrome is a genetic disease, less than 1% of cases are inherited. The remainder of cases are caused by de novo (new) mutations. […] The MECP2 gene is located on the X-chromosome, which is one of the chromosomes whose inheritance helps determine biological sex. […] By contrast, males have only one X-chromosome, so if they inherit a mutant version of MECP2 they do not have a working copy of the gene. Without a functional version of MECP2, boys typically do not survive early infancy. […] Yet, there are a few reported cases of males with Rett syndrome. These individuals have one of the rarer mutations that causes the disease, and may reach adulthood.

• #37 Rett syndrome Information | Mount Sinai – New York

  https://www.mountsinai.org/health-library/diseases-conditions/rett-syndrome

  Rett syndrome (RTT) is a disorder of the nervous system. This condition leads to developmental problems in children. It mostly affects language skills and hand use. […] Most RTT cases are due to a problem in the gene called MECP2. This gene is on the X chromosome. Females have 2 X chromosomes. Even when one chromosome has this defect, the other X chromosome is normal enough for the child to survive. […] Males born with this defective gene do not have a second X chromosome to make up for the problem. Therefore, the defect usually results in miscarriage, stillbirth, or very early death.

• #38 Azthena logo with the word Azthena

  https://www.news-medical.net/health/Causes-of-Rett-Syndrome.aspx

  Most cases of Rett syndrome are caused by a genetic mutation that affects a gene called MECP2 present on the X chromosome. […] The mutation that causes this condition arises in one of two ways: […] As a sporadic or de novo mutation, meaning it is not inherited and occurs in individuals with no family history of the condition. Almost all cases of Rett syndrome are caused by a sporadic mutation. […] As a germline mutation inherited from mothers who are phenotypically normal but have a mutation in the MECP2 gene, which is located on the long arm of the X chromosome. […] Rett syndrome occurs in cases where one X chromosome with a normal MECP2 gene leads to half a child’s brain cells working properly, while an MECP2 mutation present on the other X chromosome causes the other half of the child’s brain cells to be abnormal and not function properly. […] On rare occasions, cases of Rett syndrome are seen in males when the child is born with more than one X chromosome (an XXY configuration), a condition referred to as Klinefelter’s syndrome.

• #39 Rett Syndrome: What It Is, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/6089-rett-syndrome

  Rett syndrome is a rare genetic and neurological condition that primarily affects girls. A genetic variant causes it and plays an important role in brain development. […] A genetic variant of the MECP2 gene causes most cases of Rett syndrome. This gene provides instructions to make the MECP2 protein. This protein holds the connection (synapse) between nerve cells and helps your child’s brain function as expected. […] Not all cases of Rett syndrome affect the MECP2 gene. Some gene variants (like deletions) or genetic variants to other genes, like CDJK5 and FOXG1, can lead to atypical types. Some unidentified genes can also cause symptoms. […] The genetic change occurs spontaneously (randomly). It’s not usually inherited.

• #40 Rett syndrome: MedlinePlus GeneticsLock

  https://medlineplus.gov/genetics/condition/rett-syndrome/

  Several conditions with signs and symptoms overlapping those of Rett syndrome have been found to result from mutations in other genes. These conditions, including FOXG1 syndrome and CDKL5 deficiency disorder, were previously thought to be variant forms of Rett syndrome. However, doctors and researchers have identified some important differences between the conditions, so they are now usually considered to be separate disorders. […] In more than 99 percent of people with Rett syndrome, there is no history of the disorder in their family. Many of these cases result from new mutations in the MECP2 gene. […] A few families with more than one affected family member have been described. These cases helped researchers determine that classic Rett syndrome and variants caused by MECP2 gene mutations have an X-linked dominant pattern of inheritance.

• #41 Rett Syndrome: Causes and Treatment Options | Sunray ABA

  https://www.sunrayaba.com/post/rett-syndrome-causes-and-treatment-options

  Rett syndrome is predominantly caused by mutations in the methyl-CpG-binding protein 2 (MECP2) gene, located on the X chromosome. Nearly all cases (approximately 95%) are caused by mutations in the MECP2 gene. […] Over 200 different mutations in the MECP2 gene have been identified in people with Rett syndrome. The most common types include: Missense mutations (30-35%): Change a single amino acid in the protein, Nonsense mutations (35-40%): Create a premature stop signal, producing a shortened protein, Deletions or insertions (10-15%): Remove or add DNA segments, disrupting the protein’s structure, Large deletions (5-10%): Remove substantial portions of the gene. […] While MECP2 mutations account for approximately 95% of classic Rett syndrome cases, mutations in other genes can cause Rett-like conditions: CDKL5: Associated with an early-onset seizure variant of Rett syndrome, FOXG1: Associated with the congenital variant of Rett syndrome, CTNNB1: Can cause a neurodevelopmental disorder with some features similar to Rett syndrome.

• #42 Rett’s Syndrome: Symptoms and Treatment | Doctor

  https://patient.info/doctor/rett-syndrome

  Rett syndrome is an X-linked neurodevelopmental condition characterised by loss of spoken language and hand use with the development of distinctive hand stereotypies. […] The culprit gene, methyl-CpG binding protein-2 (MECP2) was discovered in 1999. This gene on chromosome Xq28 encodes for a protein that is involved in the methylation and regulation of other genes’ activities. […] Mutations in MECP2 are found in 95-97% of those with typical Rett syndrome. However, in atypical cases, only 50-70% of cases have mutations in MECP2. […] It appears to arise as a sporadic mutation or chromosomal abnormality affecting the X chromosome. […] A severe early-onset Rett syndrome-like illness that often includes seizures or infantile spasms can be caused by mutation in the cyclin-dependent kinase-like 5 (CDKL5) gene. […] Another rare variant has been described associated with a FOXG1 gene on chromosome 14q13.2.

• #43 Rett syndrome: Genetics, clinical features, and diagnosis – UpToDate

  https://www.uptodate.com/contents/rett-syndrome-genetics-clinical-features-and-diagnosis

  Rett syndrome (RTT) is a severe neurodevelopmental disorder that occurs almost exclusively in females. […] Most cases result from pathogenic variants in the MECP2 gene. […] In most patients, RTT is caused by pathogenic variants in the MECP2 gene, which maps to Xq28 and encodes methyl-CpG binding protein 2 (MeCP2). […] Pathogenic variants in MECP2 have been detected in approximately 95 percent of classic sporadic RTT cases and 75 percent of atypical RTT cases. […] A minority of patients have atypical RTT caused by pathogenic variants in the CDKL5 or FOXG1 genes. […] There are three types of pathogenic variants in MECP2: missense, frameshift, and nonsense.

• #44 Rett syndrome: MedlinePlus GeneticsLock

  https://medlineplus.gov/genetics/condition/rett-syndrome/

  Several conditions with signs and symptoms overlapping those of Rett syndrome have been found to result from mutations in other genes. These conditions, including FOXG1 syndrome and CDKL5 deficiency disorder, were previously thought to be variant forms of Rett syndrome. However, doctors and researchers have identified some important differences between the conditions, so they are now usually considered to be separate disorders. […] In more than 99 percent of people with Rett syndrome, there is no history of the disorder in their family. Many of these cases result from new mutations in the MECP2 gene. […] A few families with more than one affected family member have been described. These cases helped researchers determine that classic Rett syndrome and variants caused by MECP2 gene mutations have an X-linked dominant pattern of inheritance.

• #45 Rett syndrome – biological pathways leading from MECP2 to disorder phenotypes | Orphanet Journal of Rare Diseases | Full Text

  https://ojrd.biomedcentral.com/articles/10.1186/s13023-016-0545-5

  Rett syndrome (RTT) is a rare disease but still one of the most abundant causes for intellectual disability in females. […] A single mutation in one gene, coding for methyl-CpG-binding protein 2 (MECP2), is responsible for the disease. […] Cause of RTT is in most cases a de novo mutation of MECP2 (methyl-CpG-binding protein 2) gene; which was discovered by Amir et al. […] However, as stated by Neul et al., not all mutations in MECP2 cause RTT and not all RTT patients have mutated MECP2. […] Some MECP2 mutations cause not RTT but a mild intellectual disability and mutations in two other genes can cause a RTT like phenotype, i.e. FOXG1 and CDKL5. […] Recent research was able to find a correlation between certain MECP2 mutations (or MECP2 variants) and some phenotypes, e.g. cardiorespiratory phenotype, but most of the biological pathways between gene and phenotype are not yet fully understood.

• #46 Rett Syndrome | National Institute of Neurological Disorders and Stroke

  https://www.ninds.nih.gov/health-information/disorders/rett-syndrome

  Nearly all cases of Rett syndrome are caused by a mutation in the methyl CpG binding protein 2, or MECP2 (pronounced meck-pea-two) gene. The MECP2 gene contains instructions for the synthesis of a protein called methyl cytosine binding protein 2 (MeCP2), which is needed for brain development and acts as one of the many biochemical switches that activate and deactivate gene functions. Because the MECP2 gene does not function properly in individuals with Rett syndrome, they may have too little MeCP2, or the MeCP2 they do have doesn’t work properly. […] Not everyone who has an MECP2 mutation has Rett syndrome. Scientists believe some cases may be caused by partial gene deletions, mutations in other parts of the MECP2 gene, or additional genes that have not yet been identified. Genetic and environmental factors can contribute to differences in the severity and types of symptoms found in individuals with Rett syndrome. Those may include: where the MECP2 mutation is located in the gene, how the individuals sex chromosomes interact, and other genes can make the symptoms worse or protect from the effects of the mutation.

• #47 Rett Syndrome: Symptoms, Causes, and Treatment

  https://www.achievingstarstherapy.com/blog/rett-syndrome-symptoms-causes-and-treatment

  Rett Syndrome (RTT) is a rare genetic disorder that primarily affects girls. It is characterized by a range of symptoms and is caused by mutations in the MECP2 gene. […] The MECP2 gene provides instructions for making a protein that plays a crucial role in brain development and function. In most cases of Rett syndrome, the genetic mutations occur randomly and are not inherited. However, a small percentage of cases can be inherited from parents who carry the mutated gene. […] The severity and progression of Rett syndrome can be influenced by various factors, including the specific location, type, and severity of the MECP2 gene mutation, as well as the process of random X-inactivation. Additionally, environmental factors can contribute to differences in symptom severity and types.

• #48 Rett Syndrome | National Institute of Neurological Disorders and Stroke

  https://www.ninds.nih.gov/health-information/disorders/rett-syndrome

  Nearly all cases of Rett syndrome are caused by a mutation in the methyl CpG binding protein 2, or MECP2 (pronounced meck-pea-two) gene. The MECP2 gene contains instructions for the synthesis of a protein called methyl cytosine binding protein 2 (MeCP2), which is needed for brain development and acts as one of the many biochemical switches that activate and deactivate gene functions. Because the MECP2 gene does not function properly in individuals with Rett syndrome, they may have too little MeCP2, or the MeCP2 they do have doesn’t work properly. […] Not everyone who has an MECP2 mutation has Rett syndrome. Scientists believe some cases may be caused by partial gene deletions, mutations in other parts of the MECP2 gene, or additional genes that have not yet been identified. Genetic and environmental factors can contribute to differences in the severity and types of symptoms found in individuals with Rett syndrome. Those may include: where the MECP2 mutation is located in the gene, how the individuals sex chromosomes interact, and other genes can make the symptoms worse or protect from the effects of the mutation.

• #49 Rett Syndrome: Symptoms, Causes, and Treatment

  https://www.achievingstarstherapy.com/blog/rett-syndrome-symptoms-causes-and-treatment

  Rett Syndrome (RTT) is a rare genetic disorder that primarily affects girls. It is characterized by a range of symptoms and is caused by mutations in the MECP2 gene. […] The MECP2 gene provides instructions for making a protein that plays a crucial role in brain development and function. In most cases of Rett syndrome, the genetic mutations occur randomly and are not inherited. However, a small percentage of cases can be inherited from parents who carry the mutated gene. […] The severity and progression of Rett syndrome can be influenced by various factors, including the specific location, type, and severity of the MECP2 gene mutation, as well as the process of random X-inactivation. Additionally, environmental factors can contribute to differences in symptom severity and types.

• #50 Rett syndrome – biological pathways leading from MECP2 to disorder phenotypes | Orphanet Journal of Rare Diseases | Full Text

  https://ojrd.biomedcentral.com/articles/10.1186/s13023-016-0545-5

  Several genes have been found to be increased or decreased in expression, levels of various metabolites are changed and several biological pathways were found to be typically affected although the molecular mechanisms are not yet clear. […] Bedogni et al. mentioned the difficulty to identify unique target pathways of MECP2 because MECP2 is both a repressor and an activator of transcription and the balancing and timing of transcription levels seems to contribute more to disorder development than activation of single pathways. […] The differences in global gene expression of RTT and wild-type control groups are not substantial neither in fold change nor number of genes differently expressed – indicating that more subtle dysregulation events in several pathways are responsible for RTT. […] In summary, MECP2 affects epigenetic regulation of gene expression, which changes neurobiological activity, network formation and function which causes the major phenotype.

• #51 Rett Syndrome: Practice Essentials, Background, Pathophysiology and Etiology

  https://emedicine.medscape.com/article/916377-overview

  Mutations in the MECP2 gene produce loss of function of this protein and unregulated expression of the genes that it normally affects, some of which appear to be crucial in nervous system development beyond the initial stages. […] A study of 974 RS patients was conducted using data from databases that employed multiplex ligation-dependent probe amplification (MLPA) to detect large deletions on MECP2. […] Areas of research have included the study of insulinlike growth factor 1 (IGF-1), which may extend the life span and increase brain weight in mice with RS. […] Scoliosis may be associated with mutation or deletion of p.Arg255.

• #52 New findings activate a better understanding of Rett syndrome’s causes

  https://medicalxpress.com/news/2024-05-rett-syndrome.html

  Rett syndrome is caused by mutations to the gene MECP2, which is highly expressed in the brain and appears to play important roles in maintaining healthy neurons. […] This suggests that Rett syndrome may be caused by a decrease in transcription of the genes targeted by MECP2, due to MECP2 mutations that prevent it from binding RNA Pol II or binding DNA. […] Consistent with this idea, most of the common disease-linked MECP2 mutations are truncations: mutations in which part of the protein is missing, which may alter the interaction between MECP2 and RNA Pol II.

• #53 New findings activate a better understanding of Rett syndrome’s causes | Whitehead Institute

  https://wi.mit.edu/news/new-findings-activate-better-understanding-rett-syndrome-s-causes

  Rett syndrome is caused by mutations to the gene MECP2, which is highly expressed in the brain and appears to play important roles in maintaining healthy neurons. […] This suggests that Rett syndrome may be caused by a decrease in transcription of the genes targeted by MECP2, due to MECP2 mutations that prevent it from binding RNA Pol II or binding DNA. […] Most of the common disease-linked MECP2 mutations are truncations: mutations in which part of the protein is missing, which may alter the interaction between MECP2 and RNA Pol II.

• #54 Rett syndrome – biological pathways leading from MECP2 to disorder phenotypes | Orphanet Journal of Rare Diseases | Full Text

  https://ojrd.biomedcentral.com/articles/10.1186/s13023-016-0545-5

  At the moment, several hundred different mutations have been reported leading to RTT by loss or impaired function of MECP2 protein due to truncation, abnormal folding, or binding instability. […] This contributes to the variety of RTT phenotype and symptom severity. […] The effects of total absence of MECP2 protein were investigated in several model systems. […] In another mouse model, silencing MECP2 in GABAergic neurons led to severe RTT like phenotype. […] Sixty-seven percent of all MECP2 mutations found in humans are in eight hot spots: R106, R133, T158, R168, R255, R270, R294 and R306. […] Most of the mutations which cause RTT occur in the MDB region of MECP2. […] The examination and investigation of RTT females (and model systems) revealed that an impaired MECP2 influences biological pathways on many levels.

• #55 About Rett Syndrome, Symptoms, Causes, Diagnosis and Treatments

  https://reverserett.org/about-rett-syndrome/

  Rett is caused by errors in a gene called MECP2, which is located on the X chromosome. […] Mutations in a gene called MECP2 (methyl-CpG-binding protein 2) were identified as the cause of Rett syndrome in 1999, in the laboratory of Huda Zoghbi, MD, at Baylor College of Medicine. […] In most cases, the damaged copy of MECP2 can be traced to a random mutation in sperm.

• #56 Rett syndrome is caused by mutations in X-linked MECP2, encoding methyl-CpG-binding protein 2 | Nature Genetics

  https://www.nature.com/articles/ng1099_185

  Rett syndrome is caused by mutations in X-linked MECP2, encoding methyl-CpG-binding protein 2. […] It has been proposed that RTT is caused by an X-linked dominant mutation with lethality in hemizygous males. […] Using a systematic gene screening approach, we have identified mutations in the gene (MECP2) encoding X-linked methyl-CpG-binding protein 2 (MeCP2) as the cause of some cases of RTT. […] Our study reports the first disease-causing mutations in RTT and points to abnormal epigenetic regulation as the mechanism underlying the pathogenesis of RTT.

• #57 First Two Children Receive New Gene Therapy for Rett Syndrome | Today’s Clinical Lab

  https://www.clinicallab.com/first-two-children-receive-new-gene-therapy-for-rett-syndrome-27629

  In 1999, a team led by Huda Zoghbi, MD, a distinguished service professor at Baylor College of Medicine, founding director of the Jan and Dan Duncan Neurological Research Institute (Duncan NRI) at Texas Childrens Hospital and Howard Hughes Medical Institute investigator, made the transformational discovery that mutations in methyl cytosine-binding protein 2 (MeCP2) gene (MECP2) causes Rett syndrome. […] Presently, only one specific treatment exists for Rett syndrome, and that drug does not correct the root cause of the disease, which is the loss or alteration of MECP2. […] While gene therapy has proven to be a powerful tool in the treatment arsenal for a number of devastating genetic conditions, the highly variable transgene expression associated with conventional gene therapies has limited its application in many complex neurological disorders, especially Rett syndrome in which MECP2 transgene overexpression is toxic, said Bernhard Suter, MD, principal investigator of this Phase 1/2 clinical trial. […] To address these issues, NGN-401 was strategically designed to maximize the therapeutic activity while averting toxicities due to transgene overexpression.

• #58 Rett Syndrome: Practice Essentials, Background, Pathophysiology and Etiology

  https://emedicine.medscape.com/article/916377-overview

  Rett syndrome (RS) is related to various mutations on the MECP2 gene, which codes for methyl-CpG binding protein-2 (MECP2). […] The specific mutation on the gene related to RS (methyl-CpG binding protein-2 [MECP2]) was identified late in 1999. […] The mutations that cause RS are almost all sporadic. In families with a girl who has RS, the increased risk of having a second girl with the syndrome is reportedly less than 0.4%. However, recurrence in families can occur through mechanisms such as germline mosaicism. […] About 70% of RS cases are due to 4 missense mutations (ie, R106W, R133C, T158M, R306C) and 4 nonsense protein-truncating mutations (ie, R168X, R255X, R270X, R294X), which are large deletions that cause significant gene destruction, resulting in greater severity. […] RS is the first human disease determined to be caused by defects in a protein that regulates gene expression through interaction with methylated DNA.

• #59 A mouse Mecp2-null mutation causes neurological symptoms that mimic Rett syndrome | Nature Genetics

  https://www.nature.com/articles/ng0301_322

  Rett syndrome (RTT) is an inherited neurodevelopmental disorder of females that occurs once in 10,000-15,000 births. […] Most RTT patients are heterozygous for mutations in the X-linked gene MECP2, encoding a protein that binds to methylated sites in genomic DNA and facilitates gene silencing. […] Amir, R.E. et al. Rett syndrome is caused by mutations in X-linked MECP2, encoding methyl-CpG-binding protein 2. […] Bienvenu, T. et al. MECP2 mutations account for most cases of typical forms of Rett syndrome. […] Chen, R., Akbarian, S., Tudor, M. Jaenisch, R. Deficiency of methyl-CpG binding protein-2 in CNS neurons results in a Rett-like phenotype in mice.

• #60 Rett syndrome: Genetics, clinical features, and diagnosis – UpToDate

  https://www.uptodate.com/contents/rett-syndrome-genetics-clinical-features-and-diagnosis

  Rett syndrome (RTT) is a severe neurodevelopmental disorder that occurs almost exclusively in females. […] Most cases result from pathogenic variants in the MECP2 gene. […] In most patients, RTT is caused by pathogenic variants in the MECP2 gene, which maps to Xq28 and encodes methyl-CpG binding protein 2 (MeCP2). […] Pathogenic variants in MECP2 have been detected in approximately 95 percent of classic sporadic RTT cases and 75 percent of atypical RTT cases. […] A minority of patients have atypical RTT caused by pathogenic variants in the CDKL5 or FOXG1 genes. […] There are three types of pathogenic variants in MECP2: missense, frameshift, and nonsense.

• #61 Rett Syndrome: Symptoms, Causes, and Treatment | Grateful Care ABA

  https://www.gratefulcareaba.com/blog/rett-syndrome-symptoms-causes-and-treatment

  Genetic testing plays a pivotal role in confirming the presence of Rett syndrome, with a MECP2 mutation being identified in over 95% of cases. […] The presence of a MECP2 mutation is a hallmark of Rett syndrome, with more than 95% of cases showing this genetic alteration. […] Genetic testing is a vital component of diagnosing Rett syndrome, particularly in confirming the presence of MECP2 mutations. […] While inherited cases of Rett syndrome are rare, most cases arise from random genetic changes that disrupt brain development. […] Understanding the genetic underpinnings of Rett syndrome through MECP2 mutation analysis is crucial for personalized treatment approaches and ongoing research efforts. […] Researchers have identified the crucial role of the MECP2 gene in the development of this neurodevelopmental disorder. Loss and gain of function mutations in the MECP2 gene have been associated with a spectrum of neuropsychiatric conditions, highlighting the complexity of MECP2-related disorders. […] Gene therapy and genome editing hold promise as revolutionary techniques for addressing the genetic abnormalities associated with Rett syndrome.

• #62 Rett syndrome | Better Health Channel

  https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/rett-syndrome

  Rett syndrome is caused by a change in the MECP2 gene that is thought to disrupt the normal function of neurons and other cells in the brain. In most cases, there is no family history of the condition and the genetic change arises randomly in one individual. […] A genetic test that reveals a change in the MECP2 gene is used to confirm a diagnosis that has already been determined or is already suspected by a medical professional. The genetic test on its own is not enough to confirm Rett syndrome, as this change in the MECP2 gene is also seen in other conditions.

• #63 The Causes of Rett Syndrome

  https://www.mastermindbehavior.com/post/rett-syndrome-causes

  Due to the malfunction of the MECP2 gene in individuals with Rett Syndrome, they may have too little MeCP2, or the MeCP2 they do have does not work properly. This ultimately leads to the symptoms associated with Rett Syndrome. Understanding the genetic causes of Rett Syndrome can be instrumental in seeking appropriate therapies and interventions for managing the condition. […] Rett Syndrome is caused by mutations in the MECP2 gene, which is involved in regulating gene expression and synaptic activity. The syndrome affects 1 in every 10,000-15,000 live births in the US, with about 90% of patients having sporadic loss-of-function mutations in this X-linked gene. […] Genetic testing is the most conclusive method for diagnosing Rett Syndrome. The test involves analyzing a sample of blood for mutations in the MECP2 gene. However, since not all individuals with Rett Syndrome have identifiable mutations in this gene, a diagnosis can also be made based on the presence of characteristic clinical symptoms.

• #64 Rett Syndrome Facts, Symptoms & Diagnosis (Everything To Know)

  https://www.girlpower2cure.org/our-cause/what-is-rett-syndrome/

  Rett Syndrome is a postnatal neurological disorder, almost exclusively occurring in girls. The condition is genetic, but Rett Syndrome is rarely inherited. […] A confirmation of Rett Syndrome typically derives from a combination of clinical assessment coupled with a genetic profile (obtained by blood sample) that identifies the MECP2 gene mutation on the X-chromosome. MECP2 mutations are not unique to Rett Syndrome and can occur in other rare disorders. […] Rett Syndrome causes issues with brain function (and more specifically – synaptic transmission), leading to impairment of sensory, cognitive, autonomic, motor, and emotional functions. […] According to Boston Children’s Hospital, there is no known prevention for Rett Syndrome. Typical Rett Syndrome is caused by a spontaneous mutation of the MECP2 gene at conception (“spontaneous mutation” indicating that the condition is genetic, but not inherited from a parent’s contributed DNA). The condition/mutation most often occurs in girls.

• #65 The Causes of Rett Syndrome

  https://www.mastermindbehavior.com/post/rett-syndrome-causes

  Due to the malfunction of the MECP2 gene in individuals with Rett Syndrome, they may have too little MeCP2, or the MeCP2 they do have does not work properly. This ultimately leads to the symptoms associated with Rett Syndrome. Understanding the genetic causes of Rett Syndrome can be instrumental in seeking appropriate therapies and interventions for managing the condition. […] Rett Syndrome is caused by mutations in the MECP2 gene, which is involved in regulating gene expression and synaptic activity. The syndrome affects 1 in every 10,000-15,000 live births in the US, with about 90% of patients having sporadic loss-of-function mutations in this X-linked gene. […] Genetic testing is the most conclusive method for diagnosing Rett Syndrome. The test involves analyzing a sample of blood for mutations in the MECP2 gene. However, since not all individuals with Rett Syndrome have identifiable mutations in this gene, a diagnosis can also be made based on the presence of characteristic clinical symptoms.

• #66 Rett Syndrome | National Institute of Neurological Disorders and Stroke

  https://www.ninds.nih.gov/health-information/disorders/rett-syndrome

  Although Rett syndrome is a genetic disorder, less than 1% of recorded cases are passed from one generation to the next. Most cases are spontaneous, which means the mutation occurs randomly. However, in some families of individuals affected by Rett syndrome, other family members have a mutation in the MECP2 gene. Families that already have an identified MECP2 mutation can get genetic testing to identify if they are carriers of the disorder. […] Some researchers suggest that the specific type of mutation in the MECP2 gene affects the severity of symptoms of Rett syndrome. Studies are underway to understand the mutations and genes contribute to the varied symptoms and severity of this disorder. […] Researchers also are trying to find other genes that may be involved in Rett syndrome. Some studies have helped to narrow the search for these genes, but much is still unknown about how these genes may cause or contribute to the disorder.

• #67 Identification of novel genetic causes of Rett syndrome-like phenotypes | Journal of Medical Genetics

  https://jmg.bmj.com/content/53/3/190

  Rett syndrome (RTT) is a severe neurodevelopmental disorder (NDD) affecting mostly girls, characterised by an apparently normal prenatal and perinatal period followed by a stagnation in development and a severe regression in language and motor skills. […] The aim of this work was to identify new genetic causes of Rett-like phenotypes using array comparative genomic hybridisation and a whole exome sequencing approach. […] We used a genomic approach combining array comparative genomic hybridisation (aCGH) and WES to find genetic causes of disease in a group of RTT-like patients who tested negative for MECP2 mutations and whenever clinically appropriate CDKL5 mutations. […] Network analysis reveals that these genes interact by means of protein interactions with each other and with the known RTT genes.

• #68 Rett Syndrome: Practice Essentials, Background, Pathophysiology and Etiology

  https://emedicine.medscape.com/article/916377-overview

  Mutations in the MECP2 gene produce loss of function of this protein and unregulated expression of the genes that it normally affects, some of which appear to be crucial in nervous system development beyond the initial stages. […] A study of 974 RS patients was conducted using data from databases that employed multiplex ligation-dependent probe amplification (MLPA) to detect large deletions on MECP2. […] Areas of research have included the study of insulinlike growth factor 1 (IGF-1), which may extend the life span and increase brain weight in mice with RS. […] Scoliosis may be associated with mutation or deletion of p.Arg255.

• #69 Identification of novel genetic causes of Rett syndrome-like phenotypes | Journal of Medical Genetics

  https://jmg.bmj.com/content/53/3/190

  Rett syndrome (RTT) is a severe neurodevelopmental disorder (NDD) affecting mostly girls, characterised by an apparently normal prenatal and perinatal period followed by a stagnation in development and a severe regression in language and motor skills. […] The aim of this work was to identify new genetic causes of Rett-like phenotypes using array comparative genomic hybridisation and a whole exome sequencing approach. […] We used a genomic approach combining array comparative genomic hybridisation (aCGH) and WES to find genetic causes of disease in a group of RTT-like patients who tested negative for MECP2 mutations and whenever clinically appropriate CDKL5 mutations. […] Network analysis reveals that these genes interact by means of protein interactions with each other and with the known RTT genes.

• #70 Rett syndrome – biological pathways leading from MECP2 to disorder phenotypes | Orphanet Journal of Rare Diseases | Full Text

  https://ojrd.biomedcentral.com/articles/10.1186/s13023-016-0545-5

  Several genes have been found to be increased or decreased in expression, levels of various metabolites are changed and several biological pathways were found to be typically affected although the molecular mechanisms are not yet clear. […] Bedogni et al. mentioned the difficulty to identify unique target pathways of MECP2 because MECP2 is both a repressor and an activator of transcription and the balancing and timing of transcription levels seems to contribute more to disorder development than activation of single pathways. […] The differences in global gene expression of RTT and wild-type control groups are not substantial neither in fold change nor number of genes differently expressed – indicating that more subtle dysregulation events in several pathways are responsible for RTT. […] In summary, MECP2 affects epigenetic regulation of gene expression, which changes neurobiological activity, network formation and function which causes the major phenotype.

• #71 Glossary & FAQs | International Rett Syndrome Foundation

  https://www.rettsyndrome.org/about-rett-syndrome/glossary-and-faqs/

  Rett syndrome is a genetic disorder. It is caused by a spontaneous pathogenic variant or mutation on a gene called MECP2 that is located on the X chromosome in 96% of clinically diagnosed individuals. […] Rett syndrome is not considered to be inherited. The MECP2 variant is currently believed to be de novo, passed from parent to child in less than 1% of recorded cases. […] In Rett syndrome, mutations in the MECP2 gene disrupt normal brain development, leading to the condition’s symptoms. […] A treatment approach that aims to correct or replace faulty genes responsible for a disease. In Rett syndrome, gene therapy research focuses on restoring or compensating for the function of the MECP2 gene, with the goal of reducing symptoms or reversing the condition’s effects.

• #72 First Two Children Receive New Gene Therapy for Rett Syndrome | Today’s Clinical Lab

  https://www.clinicallab.com/first-two-children-receive-new-gene-therapy-for-rett-syndrome-27629

  In 1999, a team led by Huda Zoghbi, MD, a distinguished service professor at Baylor College of Medicine, founding director of the Jan and Dan Duncan Neurological Research Institute (Duncan NRI) at Texas Childrens Hospital and Howard Hughes Medical Institute investigator, made the transformational discovery that mutations in methyl cytosine-binding protein 2 (MeCP2) gene (MECP2) causes Rett syndrome. […] Presently, only one specific treatment exists for Rett syndrome, and that drug does not correct the root cause of the disease, which is the loss or alteration of MECP2. […] While gene therapy has proven to be a powerful tool in the treatment arsenal for a number of devastating genetic conditions, the highly variable transgene expression associated with conventional gene therapies has limited its application in many complex neurological disorders, especially Rett syndrome in which MECP2 transgene overexpression is toxic, said Bernhard Suter, MD, principal investigator of this Phase 1/2 clinical trial. […] To address these issues, NGN-401 was strategically designed to maximize the therapeutic activity while averting toxicities due to transgene overexpression.

• #73 First Two Children Receive New Gene Therapy for Rett Syndrome | Today’s Clinical Lab

  https://www.clinicallab.com/first-two-children-receive-new-gene-therapy-for-rett-syndrome-27629

  In 1999, a team led by Huda Zoghbi, MD, a distinguished service professor at Baylor College of Medicine, founding director of the Jan and Dan Duncan Neurological Research Institute (Duncan NRI) at Texas Childrens Hospital and Howard Hughes Medical Institute investigator, made the transformational discovery that mutations in methyl cytosine-binding protein 2 (MeCP2) gene (MECP2) causes Rett syndrome. […] Presently, only one specific treatment exists for Rett syndrome, and that drug does not correct the root cause of the disease, which is the loss or alteration of MECP2. […] While gene therapy has proven to be a powerful tool in the treatment arsenal for a number of devastating genetic conditions, the highly variable transgene expression associated with conventional gene therapies has limited its application in many complex neurological disorders, especially Rett syndrome in which MECP2 transgene overexpression is toxic, said Bernhard Suter, MD, principal investigator of this Phase 1/2 clinical trial. […] To address these issues, NGN-401 was strategically designed to maximize the therapeutic activity while averting toxicities due to transgene overexpression.

• #74 First Two Children Receive New Gene Therapy for Rett Syndrome | Today’s Clinical Lab

  https://www.clinicallab.com/first-two-children-receive-new-gene-therapy-for-rett-syndrome-27629

  In 1999, a team led by Huda Zoghbi, MD, a distinguished service professor at Baylor College of Medicine, founding director of the Jan and Dan Duncan Neurological Research Institute (Duncan NRI) at Texas Childrens Hospital and Howard Hughes Medical Institute investigator, made the transformational discovery that mutations in methyl cytosine-binding protein 2 (MeCP2) gene (MECP2) causes Rett syndrome. […] Presently, only one specific treatment exists for Rett syndrome, and that drug does not correct the root cause of the disease, which is the loss or alteration of MECP2. […] While gene therapy has proven to be a powerful tool in the treatment arsenal for a number of devastating genetic conditions, the highly variable transgene expression associated with conventional gene therapies has limited its application in many complex neurological disorders, especially Rett syndrome in which MECP2 transgene overexpression is toxic, said Bernhard Suter, MD, principal investigator of this Phase 1/2 clinical trial. […] To address these issues, NGN-401 was strategically designed to maximize the therapeutic activity while averting toxicities due to transgene overexpression.

• #75 Rett Syndrome: Symptoms, Causes, and Treatment | Grateful Care ABA

  https://www.gratefulcareaba.com/blog/rett-syndrome-symptoms-causes-and-treatment

  Genetic testing plays a pivotal role in confirming the presence of Rett syndrome, with a MECP2 mutation being identified in over 95% of cases. […] The presence of a MECP2 mutation is a hallmark of Rett syndrome, with more than 95% of cases showing this genetic alteration. […] Genetic testing is a vital component of diagnosing Rett syndrome, particularly in confirming the presence of MECP2 mutations. […] While inherited cases of Rett syndrome are rare, most cases arise from random genetic changes that disrupt brain development. […] Understanding the genetic underpinnings of Rett syndrome through MECP2 mutation analysis is crucial for personalized treatment approaches and ongoing research efforts. […] Researchers have identified the crucial role of the MECP2 gene in the development of this neurodevelopmental disorder. Loss and gain of function mutations in the MECP2 gene have been associated with a spectrum of neuropsychiatric conditions, highlighting the complexity of MECP2-related disorders. […] Gene therapy and genome editing hold promise as revolutionary techniques for addressing the genetic abnormalities associated with Rett syndrome.

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