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A synonymous codon variant altering splicing of RBCK1 expands the phenotype and genotype spectra of polyglucosan body myopathy 1.

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Polyglucosan body myopathy type 1 (PGBM1, OMIM #615895.) is a rare autosomal recessive disorder caused by RBCK1 mutations. The patients displayed polyglucosan accumulation in skeletal and cardiac muscles, giving rise… Click to show full abstract

Polyglucosan body myopathy type 1 (PGBM1, OMIM #615895.) is a rare autosomal recessive disorder caused by RBCK1 mutations. The patients displayed polyglucosan accumulation in skeletal and cardiac muscles, giving rise to loss of ambulation and heart failure with or without immune system dysregulation. So far, only 24 patients have been reported, all of whom exhibited symptoms before adulthood. Here, we reported the first case of an adult-onset PGBM1 patient with a novel compound heterozygous RBCK1 gene mutation consisting of a nonsense and synonymous variant affecting splicing.

Keywords: codon variant; synonymous codon; polyglucosan body; body myopathy

Journal Title: Clinical genetics
Year Published: 2023

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