Choroba tay-sachsa – Rokowania, prognozy i postęp choroby

Choroba tay-sachsa
Rokowania, prognozy i postęp choroby

Choroba Tay-Sachsa (TSD) to autosomalna recesywna choroba neurodegeneracyjna spowodowana niedoborem enzymu lizosomalnego β-heksozaminidazy A (HEXA), prowadząca do akumulacji gangliozydu GM2 w neuronach. Niemowlęca forma, ujawniająca się między 3 a 6 miesiącem życia, charakteryzuje się postępującą degeneracją neurologiczną, napadami padaczkowymi oraz nawracającymi infekcjami, z medianą przeżycia około 4-5 lat. Młodzieńcza forma, z objawami pojawiającymi się między 2 a 10 rokiem życia, cechuje się wolniejszą progresją i średnią przeżywalnością do 10-15 lat. Najrzadszy wariant późnoujawniający się manifestuje się w późnym dzieciństwie lub dorosłości, z objawami motorycznymi i psychiatrycznymi, a długość życia może sięgać 60-70 lat. Poziom aktywności enzymu HEXA koreluje odwrotnie z ciężkością choroby, a diagnostyka genetyczna umożliwia identyfikację podtypów i prognozowanie przebiegu.

Choroba Tay-Sachsa (Choroba tay-sachsa) – Prognozy (przewidywanie wyniku)

Rokowanie w niemowlęcej formie choroby
Rokowanie w młodzieńczej formie choroby
Rokowanie w późnoujawniającym się wariancie choroby
Czynniki wpływające na rokowanie
Perspektywy terapeutyczne i ich wpływ na rokowanie
Profilaktyka i poradnictwo genetyczne
Podsumowanie rokowania w zależności od formy choroby
Kolejne rozdziały

Choroba Tay-Sachsa (Choroba tay-sachsa) – Prognozy (przewidywanie wyniku)

Choroba Tay-Sachsa (TSD) jest postępującą chorobą neurodegeneracyjną, spowodowaną niedoborem aktywności enzymu lizosomalnego β-heksozaminidazy A (HEXA), co prowadzi do gromadzenia się gangliozydu GM2 w neuronach. Ta autosomalnie recesywna choroba charakteryzuje się progresywnym pogorszeniem stanu neurologicznego, a jej przebieg i rokowanie różnią się w zależności od formy i wieku wystąpienia pierwszych objawów.¹²

Rokowanie w niemowlęcej formie choroby

Niemowlęca forma choroby Tay-Sachsa jest najczęstszą i najbardziej wyniszczającą postacią tej choroby. Charakteryzuje się pojawieniem objawów w wieku od 3 do 6 miesięcy życia. W tej formie choroby obserwuje się:³⁴⁵

Postępującą degenerację neurologiczną, która często prowadzi do stanu wegetatywnego
Napady padaczkowe, często oporne na leczenie
Nawracające infekcje, które są najczęstszą przyczyną zgonu

⁶

Pomimo zapewnienia najlepszej opieki medycznej, dzieci z niemowlęcą postacią choroby Tay-Sachsa rzadko przeżywają dłużej niż do wieku 4-5 lat. Średnia oczekiwana długość życia dla dzieci z TSD wynosi około 5 lat. Obecnie nie istnieje skuteczne leczenie tej formy choroby.⁷⁸⁹

Rokowanie w młodzieńczej formie choroby

Młodzieńcza forma choroby Tay-Sachsa jest mniej powszechna niż forma niemowlęca i charakteryzuje się łagodniejszym przebiegiem. W tej formie:¹⁰¹¹

Objawy zazwyczaj pojawiają się między 2 a 10 rokiem życia
Obserwuje się postępującą utratę umiejętności psychomotorycznych
Średnia przeżywalność sięga wieku nastoletniego

¹²

W cięższych przypadkach młodzieńczej postaci choroby Tay-Sachsa, zgon może nastąpić już we wczesnym dzieciństwie. Typowo jednak progresja choroby jest wolniejsza niż w postaci niemowlęcej, a śmierć następuje zazwyczaj w wieku 10-15 lat.¹³¹⁴

Rokowanie w późnoujawniającym się wariancie choroby

Późnoujawniający się wariant choroby Tay-Sachsa (tzw. wariant dorosłych) jest najrzadszą i najmniej ciężką formą tej choroby. W tej postaci:¹⁵¹⁶

Objawy zaczynają się pojawiać w późnym dzieciństwie lub w wieku dorosłym
Obserwuje się postępujące trudności w chodzeniu i upośledzenie funkcji motorycznych
Często występują objawy psychiatryczne, które mogą być oporne na leczenie
Ciężkość objawów jest bardzo zróżnicowana

¹⁷¹⁸

Rokowanie dla osób z późnoujawniającą się postacią choroby Tay-Sachsa jest bardzo zróżnicowane i często nie wpływa na długość życia. Choć długość życia pacjentów z tą postacią nie jest dobrze zbadana i trudna do przewidzenia, znane są przypadki osób żyjących do 60-70 roku życia.¹⁹²⁰

Czynniki wpływające na rokowanie

Kilka czynników ma istotny wpływ na rokowanie pacjentów z chorobą Tay-Sachsa:²¹

Aktywność enzymu HEXA: Poziom aktywności enzymu HEXA jest odwrotnie skorelowany z ciężkością choroby. Niższa aktywność enzymu prowadzi do cięższego przebiegu i gorszego rokowania
Warianty genetyczne: Około 99% osób z chorobą Tay-Sachsa ma dwa identyfikowalne patogenne warianty w genie HEXA. Diagnoza genetyczna może pomóc zidentyfikować konkretny podtyp choroby, ukierunkować postępowanie medyczne i pomóc w przewidywaniu progresji choroby

²²

Perspektywy terapeutyczne i ich wpływ na rokowanie

Badania nad nowymi metodami leczenia choroby Tay-Sachsa wskazują, że istnieje ograniczone okno czasowe, w którym interwencja terapeutyczna może przynieść korzyści:²³²⁴

Znaczną poprawę przeżywalności obserwowano tylko wtedy, gdy geny terapeutyczne były wyrażane przed pojawieniem się objawów choroby lub we wczesnej fazie jej manifestacji
Zwierzęta poddane terapii we wczesnej fazie objawowej wykazywały znacznie wydłużoną długość życia, a chociaż ostatecznie pojawiały się drżenia i deficyty motoryczne, pozostawały zdolne do poruszania się
W przeciwieństwie do tego, zwierzęta poddane terapii w późnej fazie choroby wykazywały progresję choroby nieodróżnialną od nieleczonych myszy mutantów

²⁵

Wyniki te wskazują, że istnieje ograniczona czasowo możliwość poprawy funkcji i przeżycia, ale niezależnie od całkowitego ustąpienia kardynalnych cech patologicznych gangliozydo z GM2, dochodzi się do punktu, w którym nie można zapobiec pogorszeniu funkcji i śmierci.²⁶

Profilaktyka i poradnictwo genetyczne

Ponieważ nie ma skutecznego leczenia choroby Tay-Sachsa, obecne wysiłki skupiają się na badaniach przesiewowych populacji w celu identyfikacji par nosicieli zagrożonych chorobą, a następnie oferowaniu diagnostyki prenatalnej. Identyfikacja mutacji w różnych populacjach ma bezpośrednie zastosowanie w tych wysiłkach.²⁷

W przypadku krajowych programów badań przesiewowych przedmałżeńskich zaleca się, aby rodzice spokrewnieni zasięgali porad genetycznych przed posiadaniem dzieci. Wczesna identyfikacja nosicieli i poradnictwo genetyczne mogą znacząco wpłynąć na zmniejszenie liczby przypadków choroby Tay-Sachsa, zwłaszcza w grupach o zwiększonym ryzyku.²⁸

Podsumowanie rokowania w zależności od formy choroby

Forma choroby Tay-Sachsa	Wiek wystąpienia objawów	Główne objawy	Średnia długość życia
Niemowlęca	3-6 miesięcy	Regresja neuromotoryczna, hipotonia, nasilona reakcja na bodźce, napady padaczkowe	4-5 lat
Młodzieńcza	2-10 lat	Postępująca utrata umiejętności, zaburzenia ruchowe	10-15 lat (wiek nastoletni)
Późnoujawniająca się	Późne dzieciństwo do dorosłości	Trudności w chodzeniu, upośledzenie funkcji motorycznych, objawy psychiatryczne	Zróżnicowana, może nie wpływać na długość życia (niektórzy pacjenci dożywają 60-70 lat)

²⁹³⁰³¹

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Materiały źródłowe

#1 Reversibility of neuropathology in TayâSachs-related diseases
https://pmc.ncbi.nlm.nih.gov/articles/PMC3888261/
The GM2 gangliosidoses TaySachs disease (TSD; OMIM 272800), Sandhoff disease (SD; OMIM 268800) (1,2) and GM2 activator protein deficiency (OMIM 272750) (3), are a heterogeneous group of rare neurodegenerative lysosomal storage diseases (LSDs), transmitted in an autosomal recessive fashion. […] The infantile form of GM2 gangliosidosis is the most common and invariably fatal, but attenuated adult forms also occur (9). […] Here we report greatly increased survival only when the therapeutic genes are expressed either before the disease is apparent or during its early manifestations. […] However, irrespective of when treatment was administered, widespread and abundant expression of -hexosaminidase with consequent clearance of glycoconjugates, -synuclein and ubiquitinated proteins, and abrogation of inflammatory responses and neuronal loss was observed.
#2 Identification of two HEXA mutations causing infantile-onset TayâSachs disease in the Persian population | Journal of Human Genetics
https://www.nature.com/articles/jhg201178
Infantile TaySachs disease (TSD) is a progressive neurodegenerative disorder due to the deficient activity of the lysosomal enzyme -hexosaminidase A (HEXA), which results in the neuronal accumulation of GM2 ganglioside. This autosomal recessive disease is characterized by onset at 48 months of life of neurological involvement, progressive psychomotor retardation, followed by paralysis and blindness. Affected children rarely survive beyond 5 years of age. […] As there is no effective treatment for TSD, current efforts are focused on screening populations to identify disease at-risk carrier couples, and then offering prenatal diagnosis. Identification of mutations in the Persian population will have direct application to this effort.
#3 Tay-Sachs disease – Symptoms and causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/tay-sachs-disease/symptoms-causes/syc-20378190
In the most common and severe form of Tay-Sachs disease, signs and symptoms start to show up at about 3 to 6 months of age. […] Children with this form of Tay-Sachs disease typically live only a few years. […] The juvenile form of Tay-Sachs disease is less common. Survival is typically into the teen years. […] This is a rare and less severe form with signs and symptoms beginning in late childhood to adulthood. Severity of symptoms varies greatly, and this form does not always impact life expectancy.
#4 Tay-Sachs disease | Better Health Channel
https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/tay-sachs-disease
Tay-Sachs disease (TSD) is a genetic condition that affects the nervous system. […] The life expectancy for children with TSD is around five years of age. […] Tay-Sachs disease is a degenerative condition, meaning that symptoms become worse over time. […] The life expectancy for children with TSD is around five years of age and there is currently no effective treatment.
#5 Clinical and Molecular Findings of Nine Cases with Tay-Sachs Disease From TuÌrkiye – Medical Journal of Bakirkoy
https://bakirkoymedj.org/articles/clinical-and-molecular-findings-of-nine-cases-with-tay-sachs-disease-from-turkiye/doi/BMJ.galenos.2023.2022.9-10
Our study both reassessed and expanded the known mutation spectrum of Tay-Sachs disease in Turkiye. […] Tay-Sachs disease is a fatal inherited lysosomal storage disease that mostly has an early infantile onset. […] The infantile form of TSD begins to manifest before six months of age, with neuromotor regression, hypotonia, and increased startle response. […] The definitive diagnosis of TSD in a clinically affected individual is established by demonstrating low HEXA activity and/or biallelic HEXA gene mutations. […] Because TSD is a well-known disease, cases with low beta-hexosaminidase A activity are often referred to genetic diagnosis centers for molecular genetic tests, and the diagnosis is confirmed by determining the mutation status. […] For national premarital screening programs, it may be recommended that consanguineous parents seek genetic counseling before having children.
#6 Tay-Sachs Disease – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK564432/
Tay-Sachs disease is a progressive neurodegenerative disease. […] Progressive neurological deterioration occurs, and the resulting seizures often remain refractory to treatment. Even with the best care, patients with infantile Tay-Sachs disease usually die by the age of 4 to 5. Death usually results from recurrent infections. […] In late-onset disease, there are progressive gait difficulties and motor impairment, which often requires the use of adaptive equipment and mobility assistance. Concomitant psychiatric symptoms often remain resistant to treatment. […] Progressive neurological deterioration often leads to a vegetative state, and death usually occurs by 10 to 15 years of age.
#7 Tay-Sachs disease | Better Health Channel
https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/tay-sachs-disease
Tay-Sachs disease (TSD) is a genetic condition that affects the nervous system. […] The life expectancy for children with TSD is around five years of age. […] Tay-Sachs disease is a degenerative condition, meaning that symptoms become worse over time. […] The life expectancy for children with TSD is around five years of age and there is currently no effective treatment.
#8 Hexosaminidase A deficiency | Myriad ForesightÂ® Carrier Screen
https://myriad.com/womens-health/diseases/hexosaminidase-a-deficiency/
Even with treatment, children affected by classic Tay-Sachs disease usually die by the age of four. […] The prognosis for an individual with the other forms of Tay-Sachs disease can vary, depending on both the age of onset and the severity of symptoms. Those with juvenile-onset Tay-Sachs disease typically experience progressive loss of skills between the ages of two and ten and death occurs in the teenage years. In more severe cases, those with juvenile-onset Tay-Sachs disease can die in early childhood. […] The prognosis for those with the late-onset form varies even more. The lifespans of individuals with late-onset Tay-Sachs disease are not well studied and can be difficult to predict, though there are certainly examples of people with this condition who live into their sixties or seventies.
#9 Tay-Sachs Disease – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK564432/
Tay-Sachs disease is a progressive neurodegenerative disease. […] Progressive neurological deterioration occurs, and the resulting seizures often remain refractory to treatment. Even with the best care, patients with infantile Tay-Sachs disease usually die by the age of 4 to 5. Death usually results from recurrent infections. […] In late-onset disease, there are progressive gait difficulties and motor impairment, which often requires the use of adaptive equipment and mobility assistance. Concomitant psychiatric symptoms often remain resistant to treatment. […] Progressive neurological deterioration often leads to a vegetative state, and death usually occurs by 10 to 15 years of age.
#10 Tay-Sachs disease – Symptoms and causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/tay-sachs-disease/symptoms-causes/syc-20378190
In the most common and severe form of Tay-Sachs disease, signs and symptoms start to show up at about 3 to 6 months of age. […] Children with this form of Tay-Sachs disease typically live only a few years. […] The juvenile form of Tay-Sachs disease is less common. Survival is typically into the teen years. […] This is a rare and less severe form with signs and symptoms beginning in late childhood to adulthood. Severity of symptoms varies greatly, and this form does not always impact life expectancy.
#11 Hexosaminidase A deficiency | Myriad ForesightÂ® Carrier Screen
https://myriad.com/womens-health/diseases/hexosaminidase-a-deficiency/
Even with treatment, children affected by classic Tay-Sachs disease usually die by the age of four. […] The prognosis for an individual with the other forms of Tay-Sachs disease can vary, depending on both the age of onset and the severity of symptoms. Those with juvenile-onset Tay-Sachs disease typically experience progressive loss of skills between the ages of two and ten and death occurs in the teenage years. In more severe cases, those with juvenile-onset Tay-Sachs disease can die in early childhood. […] The prognosis for those with the late-onset form varies even more. The lifespans of individuals with late-onset Tay-Sachs disease are not well studied and can be difficult to predict, though there are certainly examples of people with this condition who live into their sixties or seventies.
#12 Hexosaminidase A deficiency | Myriad ForesightÂ® Carrier Screen
https://myriad.com/womens-health/diseases/hexosaminidase-a-deficiency/
Even with treatment, children affected by classic Tay-Sachs disease usually die by the age of four. […] The prognosis for an individual with the other forms of Tay-Sachs disease can vary, depending on both the age of onset and the severity of symptoms. Those with juvenile-onset Tay-Sachs disease typically experience progressive loss of skills between the ages of two and ten and death occurs in the teenage years. In more severe cases, those with juvenile-onset Tay-Sachs disease can die in early childhood. […] The prognosis for those with the late-onset form varies even more. The lifespans of individuals with late-onset Tay-Sachs disease are not well studied and can be difficult to predict, though there are certainly examples of people with this condition who live into their sixties or seventies.
#13 Hexosaminidase A deficiency | Myriad ForesightÂ® Carrier Screen
https://myriad.com/womens-health/diseases/hexosaminidase-a-deficiency/
Even with treatment, children affected by classic Tay-Sachs disease usually die by the age of four. […] The prognosis for an individual with the other forms of Tay-Sachs disease can vary, depending on both the age of onset and the severity of symptoms. Those with juvenile-onset Tay-Sachs disease typically experience progressive loss of skills between the ages of two and ten and death occurs in the teenage years. In more severe cases, those with juvenile-onset Tay-Sachs disease can die in early childhood. […] The prognosis for those with the late-onset form varies even more. The lifespans of individuals with late-onset Tay-Sachs disease are not well studied and can be difficult to predict, though there are certainly examples of people with this condition who live into their sixties or seventies.
#14 Tay-Sachs Disease – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK564432/
Tay-Sachs disease is a progressive neurodegenerative disease. […] Progressive neurological deterioration occurs, and the resulting seizures often remain refractory to treatment. Even with the best care, patients with infantile Tay-Sachs disease usually die by the age of 4 to 5. Death usually results from recurrent infections. […] In late-onset disease, there are progressive gait difficulties and motor impairment, which often requires the use of adaptive equipment and mobility assistance. Concomitant psychiatric symptoms often remain resistant to treatment. […] Progressive neurological deterioration often leads to a vegetative state, and death usually occurs by 10 to 15 years of age.
#15 Tay-Sachs disease – Symptoms and causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/tay-sachs-disease/symptoms-causes/syc-20378190
In the most common and severe form of Tay-Sachs disease, signs and symptoms start to show up at about 3 to 6 months of age. […] Children with this form of Tay-Sachs disease typically live only a few years. […] The juvenile form of Tay-Sachs disease is less common. Survival is typically into the teen years. […] This is a rare and less severe form with signs and symptoms beginning in late childhood to adulthood. Severity of symptoms varies greatly, and this form does not always impact life expectancy.
#16 Hexosaminidase A deficiency | Myriad ForesightÂ® Carrier Screen
https://myriad.com/womens-health/diseases/hexosaminidase-a-deficiency/
Even with treatment, children affected by classic Tay-Sachs disease usually die by the age of four. […] The prognosis for an individual with the other forms of Tay-Sachs disease can vary, depending on both the age of onset and the severity of symptoms. Those with juvenile-onset Tay-Sachs disease typically experience progressive loss of skills between the ages of two and ten and death occurs in the teenage years. In more severe cases, those with juvenile-onset Tay-Sachs disease can die in early childhood. […] The prognosis for those with the late-onset form varies even more. The lifespans of individuals with late-onset Tay-Sachs disease are not well studied and can be difficult to predict, though there are certainly examples of people with this condition who live into their sixties or seventies.
#17 Tay-Sachs Disease – StatPearls – NCBI Bookshelf
https://www.ncbi.nlm.nih.gov/books/NBK564432/
Tay-Sachs disease is a progressive neurodegenerative disease. […] Progressive neurological deterioration occurs, and the resulting seizures often remain refractory to treatment. Even with the best care, patients with infantile Tay-Sachs disease usually die by the age of 4 to 5. Death usually results from recurrent infections. […] In late-onset disease, there are progressive gait difficulties and motor impairment, which often requires the use of adaptive equipment and mobility assistance. Concomitant psychiatric symptoms often remain resistant to treatment. […] Progressive neurological deterioration often leads to a vegetative state, and death usually occurs by 10 to 15 years of age.
#18 Tay-Sachs disease – Symptoms and causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/tay-sachs-disease/symptoms-causes/syc-20378190
In the most common and severe form of Tay-Sachs disease, signs and symptoms start to show up at about 3 to 6 months of age. […] Children with this form of Tay-Sachs disease typically live only a few years. […] The juvenile form of Tay-Sachs disease is less common. Survival is typically into the teen years. […] This is a rare and less severe form with signs and symptoms beginning in late childhood to adulthood. Severity of symptoms varies greatly, and this form does not always impact life expectancy.
#19 Hexosaminidase A deficiency | Myriad ForesightÂ® Carrier Screen
https://myriad.com/womens-health/diseases/hexosaminidase-a-deficiency/
Even with treatment, children affected by classic Tay-Sachs disease usually die by the age of four. […] The prognosis for an individual with the other forms of Tay-Sachs disease can vary, depending on both the age of onset and the severity of symptoms. Those with juvenile-onset Tay-Sachs disease typically experience progressive loss of skills between the ages of two and ten and death occurs in the teenage years. In more severe cases, those with juvenile-onset Tay-Sachs disease can die in early childhood. […] The prognosis for those with the late-onset form varies even more. The lifespans of individuals with late-onset Tay-Sachs disease are not well studied and can be difficult to predict, though there are certainly examples of people with this condition who live into their sixties or seventies.
#20 Tay-Sachs disease – Symptoms and causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/tay-sachs-disease/symptoms-causes/syc-20378190
In the most common and severe form of Tay-Sachs disease, signs and symptoms start to show up at about 3 to 6 months of age. […] Children with this form of Tay-Sachs disease typically live only a few years. […] The juvenile form of Tay-Sachs disease is less common. Survival is typically into the teen years. […] This is a rare and less severe form with signs and symptoms beginning in late childhood to adulthood. Severity of symptoms varies greatly, and this form does not always impact life expectancy.
#21 Invitae Tay-Sachs Disease Test | Test catalog | Invitae
https://www.invitae.com/us/providers/test-catalog/test-04719
A genetic diagnosis of TSD can identify the specific subtype of the disease, guide medical management, and help predict disease progression and outcome for the patient. […] The level of HEXA enzyme activity is inversely correlated with the severity of the disease form. […] Approximately 99% of individuals with Tay-Sachs disease have two identifiable pathogenic variants in the HEXA gene.
#22 Invitae Tay-Sachs Disease Test | Test catalog | Invitae
https://www.invitae.com/us/providers/test-catalog/test-04719
A genetic diagnosis of TSD can identify the specific subtype of the disease, guide medical management, and help predict disease progression and outcome for the patient. […] The level of HEXA enzyme activity is inversely correlated with the severity of the disease form. […] Approximately 99% of individuals with Tay-Sachs disease have two identifiable pathogenic variants in the HEXA gene.
#23 Reversibility of neuropathology in TayâSachs-related diseases
https://pmc.ncbi.nlm.nih.gov/articles/PMC3888261/
The GM2 gangliosidoses TaySachs disease (TSD; OMIM 272800), Sandhoff disease (SD; OMIM 268800) (1,2) and GM2 activator protein deficiency (OMIM 272750) (3), are a heterogeneous group of rare neurodegenerative lysosomal storage diseases (LSDs), transmitted in an autosomal recessive fashion. […] The infantile form of GM2 gangliosidosis is the most common and invariably fatal, but attenuated adult forms also occur (9). […] Here we report greatly increased survival only when the therapeutic genes are expressed either before the disease is apparent or during its early manifestations. […] However, irrespective of when treatment was administered, widespread and abundant expression of -hexosaminidase with consequent clearance of glycoconjugates, -synuclein and ubiquitinated proteins, and abrogation of inflammatory responses and neuronal loss was observed.
#24 Reversibility of neuropathology in TayâSachs-related diseases
https://pmc.ncbi.nlm.nih.gov/articles/PMC3888261/
These results indicate that there is a limited temporal opportunity in which function and survival can be improvedbut regardless of resolution of the cardinal pathological features of GM2 gangliosidosis, a point is reached when functional deterioration and death cannot be prevented. […] Importantly, the lifespan of animals injected at the early symptomatic phase was also markedly increased, and although eventually tremor and motor deficits became apparent, the animals remained capable of moving with ease around the cage, long after the onset of disease signs. […] In stark contrast, animals injected at the late phase of the illness showed progression of disease which was indistinguishable from that of untreated mutant mice. […] Our data demonstrate that viral transduction, transgene expression and bio-distribution are not hampered by the advancing process of neurological disease. […] The results show that there is a restricted temporal opportunity in which function and survival can be improvedbut regardless of a complete resolution of the cardinal pathological features of GM2 gangliosidosis, a point is reached when functional deterioration and death cannot be prevented.
#25 Reversibility of neuropathology in TayâSachs-related diseases
https://pmc.ncbi.nlm.nih.gov/articles/PMC3888261/
These results indicate that there is a limited temporal opportunity in which function and survival can be improvedbut regardless of resolution of the cardinal pathological features of GM2 gangliosidosis, a point is reached when functional deterioration and death cannot be prevented. […] Importantly, the lifespan of animals injected at the early symptomatic phase was also markedly increased, and although eventually tremor and motor deficits became apparent, the animals remained capable of moving with ease around the cage, long after the onset of disease signs. […] In stark contrast, animals injected at the late phase of the illness showed progression of disease which was indistinguishable from that of untreated mutant mice. […] Our data demonstrate that viral transduction, transgene expression and bio-distribution are not hampered by the advancing process of neurological disease. […] The results show that there is a restricted temporal opportunity in which function and survival can be improvedbut regardless of a complete resolution of the cardinal pathological features of GM2 gangliosidosis, a point is reached when functional deterioration and death cannot be prevented.
#26 Reversibility of neuropathology in TayâSachs-related diseases
https://pmc.ncbi.nlm.nih.gov/articles/PMC3888261/
These results indicate that there is a limited temporal opportunity in which function and survival can be improvedbut regardless of resolution of the cardinal pathological features of GM2 gangliosidosis, a point is reached when functional deterioration and death cannot be prevented. […] Importantly, the lifespan of animals injected at the early symptomatic phase was also markedly increased, and although eventually tremor and motor deficits became apparent, the animals remained capable of moving with ease around the cage, long after the onset of disease signs. […] In stark contrast, animals injected at the late phase of the illness showed progression of disease which was indistinguishable from that of untreated mutant mice. […] Our data demonstrate that viral transduction, transgene expression and bio-distribution are not hampered by the advancing process of neurological disease. […] The results show that there is a restricted temporal opportunity in which function and survival can be improvedbut regardless of a complete resolution of the cardinal pathological features of GM2 gangliosidosis, a point is reached when functional deterioration and death cannot be prevented.
#27 Identification of two HEXA mutations causing infantile-onset TayâSachs disease in the Persian population | Journal of Human Genetics
https://www.nature.com/articles/jhg201178
Infantile TaySachs disease (TSD) is a progressive neurodegenerative disorder due to the deficient activity of the lysosomal enzyme -hexosaminidase A (HEXA), which results in the neuronal accumulation of GM2 ganglioside. This autosomal recessive disease is characterized by onset at 48 months of life of neurological involvement, progressive psychomotor retardation, followed by paralysis and blindness. Affected children rarely survive beyond 5 years of age. […] As there is no effective treatment for TSD, current efforts are focused on screening populations to identify disease at-risk carrier couples, and then offering prenatal diagnosis. Identification of mutations in the Persian population will have direct application to this effort.
#28 Clinical and Molecular Findings of Nine Cases with Tay-Sachs Disease From TuÌrkiye – Medical Journal of Bakirkoy
https://bakirkoymedj.org/articles/clinical-and-molecular-findings-of-nine-cases-with-tay-sachs-disease-from-turkiye/doi/BMJ.galenos.2023.2022.9-10
Our study both reassessed and expanded the known mutation spectrum of Tay-Sachs disease in Turkiye. […] Tay-Sachs disease is a fatal inherited lysosomal storage disease that mostly has an early infantile onset. […] The infantile form of TSD begins to manifest before six months of age, with neuromotor regression, hypotonia, and increased startle response. […] The definitive diagnosis of TSD in a clinically affected individual is established by demonstrating low HEXA activity and/or biallelic HEXA gene mutations. […] Because TSD is a well-known disease, cases with low beta-hexosaminidase A activity are often referred to genetic diagnosis centers for molecular genetic tests, and the diagnosis is confirmed by determining the mutation status. […] For national premarital screening programs, it may be recommended that consanguineous parents seek genetic counseling before having children.
#29 Tay-Sachs disease – Symptoms and causes – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/tay-sachs-disease/symptoms-causes/syc-20378190
In the most common and severe form of Tay-Sachs disease, signs and symptoms start to show up at about 3 to 6 months of age. […] Children with this form of Tay-Sachs disease typically live only a few years. […] The juvenile form of Tay-Sachs disease is less common. Survival is typically into the teen years. […] This is a rare and less severe form with signs and symptoms beginning in late childhood to adulthood. Severity of symptoms varies greatly, and this form does not always impact life expectancy.
#30 Hexosaminidase A deficiency | Myriad ForesightÂ® Carrier Screen
https://myriad.com/womens-health/diseases/hexosaminidase-a-deficiency/
Even with treatment, children affected by classic Tay-Sachs disease usually die by the age of four. […] The prognosis for an individual with the other forms of Tay-Sachs disease can vary, depending on both the age of onset and the severity of symptoms. Those with juvenile-onset Tay-Sachs disease typically experience progressive loss of skills between the ages of two and ten and death occurs in the teenage years. In more severe cases, those with juvenile-onset Tay-Sachs disease can die in early childhood. […] The prognosis for those with the late-onset form varies even more. The lifespans of individuals with late-onset Tay-Sachs disease are not well studied and can be difficult to predict, though there are certainly examples of people with this condition who live into their sixties or seventies.
#31 Tay-Sachs disease | Better Health Channel
https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/tay-sachs-disease
Tay-Sachs disease (TSD) is a genetic condition that affects the nervous system. […] The life expectancy for children with TSD is around five years of age. […] Tay-Sachs disease is a degenerative condition, meaning that symptoms become worse over time. […] The life expectancy for children with TSD is around five years of age and there is currently no effective treatment.