Prediction of the age at onset in spinocerebellar ataxia type 1, 2, 3 and 6

The most common spinocerebellar ataxias (SCA), SCA1, SCA2, SCA3 and SCA6, are caused by a (CAG)n repeat expansion with a correlation between the number of repeats of the coding (CAG)n expansions and age at onset. We combined data from two major European cohorts of SCA1-3 and SCA6 carriers: affected individuals from the EUROSCA registry and pre-clinical individuals from the RISCA cohort. We calculated expected age at onset according to CAG repeat size from birth and from a given age to account for the age an individual has already attained. These estimations can be valuable in clinical, research and predictive-testing programs. (By Sophie Tézenas du Montcel, MD, PhD, )

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