BMJ neurology open · 2026
Bi-allelic intermediate ATXN2 repeat expansions are associated with slow progressing, leg-onset familial ALS.
СтатьяНазвание и аннотация: Перевод в очереди
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Demaegd Koen Cedric, Koole Wouter, van Vugt Joke Jfa, Dankbaar Jan Willem, Hendrikse Jeroen, Nazlı Başak A, de Carvalho Mamede, Corcia Philippe, Codron Philippe, Bernard Emilien, Guissart Claire, Couratier Philippe, Povedano Panades Mónica, van Doorn Pieter A, Warrenburg Bart P, Cooper-Knock Johnathan, ALS Sequencing Consortium, Project MinE PI’s, Pasterkamp R Jeroen, van Rheenen Wouter, van Damme Philip, van den Berg Leonard H, Veldink Jan Herman, van Es Michael A
Аннотация
OBJECTIVES: The identification of bi-allelic intermediate ATXN2 repeat expansions in a pedigree with amyotrophic lateral sclerosis (ALS) through clinical testing prompted us to investigate its relevance in the wider ALS population.
METHODS: ATXN2 repeat size was assessed in a large international cohort of ALS patients (n=6653 from Project MinE) and in neurologically intact control populations (n=13 515 controls from Project MinE and gnomad). For bi-allelic cases, we retrieved medical records, family history and MRI imaging. For familial cases, we obtained DNA samples from relatives for segregation analyses.
RESULTS: In total, we identified bi-allelic intermediate ATXN2 repeat expansions in five familial cases from three different pedigrees and five apparently sporadic cases. There is a relatively homogeneous phenotype characterised by lower limb onset and long survival (median 6 years) without significant cerebellar atrophy. Bi-allelic expansions were absent in controls (0 out of 13 515).
DISCUSSION: Here we report an apparently novel autosomal recessive form of familial ALS caused by bi-allelic intermediate ATXN2 repeat expansions, which is characterised by high penetrance, lower limb onset and slow progression. Although rare, testing for ATXN2 expansions should be performed in the clinical setting given its relevance to prognosis and genetic counselling.
METHODS: ATXN2 repeat size was assessed in a large international cohort of ALS patients (n=6653 from Project MinE) and in neurologically intact control populations (n=13 515 controls from Project MinE and gnomad). For bi-allelic cases, we retrieved medical records, family history and MRI imaging. For familial cases, we obtained DNA samples from relatives for segregation analyses.
RESULTS: In total, we identified bi-allelic intermediate ATXN2 repeat expansions in five familial cases from three different pedigrees and five apparently sporadic cases. There is a relatively homogeneous phenotype characterised by lower limb onset and long survival (median 6 years) without significant cerebellar atrophy. Bi-allelic expansions were absent in controls (0 out of 13 515).
DISCUSSION: Here we report an apparently novel autosomal recessive form of familial ALS caused by bi-allelic intermediate ATXN2 repeat expansions, which is characterised by high penetrance, lower limb onset and slow progression. Although rare, testing for ATXN2 expansions should be performed in the clinical setting given its relevance to prognosis and genetic counselling.