Neurological Involvement in Glycogen Storage Disease Type IXa due to PHKA2 Mutation.

Glycogen storage diseases (GSDs) result from the deficiency of enzymes involved in glycogen synthesis and breakdown into glucose. Mutations in the gene PHKA2 encoding phosphorylase kinase regulatory subunit alpha 2 have been linked to GSD type IXa. We describe a family with two adult brothers with neonatal hepatosplenomegaly and later onset of hearing loss, cognitive impairment, and cerebellar involvement. Whole-exome sequencing was performed on both subjects and revealed a shared hemizygous missense variant (c.A1561G; p.T521A) in exon 15 of PHKA2. The phenotype broadens the clinical and magnetic resonance imaging spectrum of GSD type IXa to include later onset neurological manifestations.

Citation

Chelsea Smith, Care4Rare Canada Consortium, Marie-Josée Dicaire, Bernard Brais, Roberta La Piana. Neurological Involvement in Glycogen Storage Disease Type IXa due to PHKA2 Mutation. The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques. 2020 May;47(3):400-403

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PMID: 31987065

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