Intergenerational instability of the C9orf72 hexanucleotide repeat
The C9orf72 hexanucleotide repeat expansion (HRE) is the most common cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). It follows autosomal dominant inheritance in families, however, a high proportion of cases are sporadic, raising the possibility of parental premutation. We have demonstrated that intermediate-length alleles (IAs) with >18 repeats (allele frequency…
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