Frontiers in Genetics (Oct 2022)

Case report: Functional characterization of a de novo c.145G>A p.Val49Met pathogenic variant in a case of PIGA-CDG with megacolon

  • Roberta Salinas-Marín,
  • Yoshiko Murakami,
  • Carlos Alberto González-Domínguez,
  • Carlos Alberto González-Domínguez,
  • Mario Ernesto Cruz-Muñoz,
  • Héctor Manuel Mora-Montes,
  • Eva Morava,
  • Eva Morava,
  • Eva Morava,
  • Taroh Kinoshita,
  • Susana Monroy-Santoyo,
  • Iván Martínez-Duncker,
  • Iván Martínez-Duncker

DOI
https://doi.org/10.3389/fgene.2022.971473
Journal volume & issue
Vol. 13

Abstract

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A subgroup of congenital disorders of glycosylation (CDGs) includes inherited GPI-anchor deficiencies (IGDs) that affect the biosynthesis of glycosylphosphatidylinositol (GPI) anchors, including the first reaction catalyzed by the X-linked PIGA. Here, we show the first PIGA-CDG case reported in Mexico in a male child with a moderate-to-severe phenotype characterized by neurological and gastrointestinal symptoms, including megacolon. Exome sequencing identified the hemizygous variant PIGA c.145G>A (p.Val49Met), confirmed by Sanger sequencing and characterized as de novo. The pathogenicity of this variant was characterized by flow cytometry and complementation assays in PIGA knockout (KO) cells.

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