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Hepatic glycogen synthase (GYS2) deficiency: seven novel patients and seven novel variants.
JIMD Reports 2020 May
Glycogen storage disease type 0 (GSD 0) is an autosomal recessive disorder of glycogen metabolism caused by mutations in the GYS2 gene manifesting in infancy or early childhood and characterized by ketotic hypoglycemia after prolonged fasting, and postprandial hyperglycemia and hyperlactatemia. GSD 0 is a rare form of hepatic glycogen storage disease with less than 30 reported patients in the literature so far.DNA samples of 93 Russian patients with clinical diagnoses of hepatic GSDs were collected and analyzed by next-generation sequencing custom target panel and by direct sequencing. Seven new GSD 0 patients with variable phenotypes were found showing 10 variants. Seven variants are novel.We present seven new GSD 0 patients with variable phenotypes. Overall, 10 different mutant alleles of the GYS2 gene were found. Seven of them are novel: c.214delC, c.845delT, c.1644C>A, c.205T>A, c.929G>T, c.1169G>C and c.1703C>A. Three of the novel variants were annotated as pathogenic and likely pathogenic; four other variants have an uncertain significance.The current results expand the spectrum of known mutations in GYS2 and suggest that phenotypes of GSD 0 are more variable and less specific than the reported ones.
Synopsis: Seven new patients with glycogen storage disease type 0 were found using next-generation sequencing and seven novel variants of GYS2 gene were annotated.
Synopsis: Seven new patients with glycogen storage disease type 0 were found using next-generation sequencing and seven novel variants of GYS2 gene were annotated.
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