Case report reveals a novel CACNA1G mutation linked to myoclonus-ataxia and intellectual disability, highlighting a wider clinical spectrum for spinocerebellar ataxia 42.
Spinocerebellar ataxias (SCAs) are characterized by substantial phenotypic variability. Among them, SCA42 is a rare non-expansion entity presenting with slowly progressive cerebellar syndrome but whose clinical spectrum may be also wider. A 53-year-old male presented with progressive myoclonus-ataxia and intellectual disability. Genetic screening revealed a novel c.3835G > A (p. Asp1279Asn) variant in the CACNA1G gene. SCA42 is a rare non-expansion SCA caused by mutations in CACNA1G on chromosome 17q21, encoding the Ca(V)3.1, a low-threshold voltage-gated T-type calcium channel. The novel variant we identified is potentially involved in channel activity. This case expands the knowledge regarding CACNA1G -associated phenotype and highlights the importance of genetic screening in myoclonus-ataxia disorders.
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Riggi et al. (2024) studied this question.
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