A Recurrent Pathogenic Variant of INPP5K Underlies Autosomal Recessive Congenital Muscular Dystrophy With Cataracts and Intellectual Disability: Evidence for a Founder Effect in Southern Italy

Adele D’Amico, Fabiana Fattori, Francesco Nicita, Sabina Barresi, Giorgio Tasca, Margherita Verardo, Simone Pizzi, Isabella Moroni, Francesca De Mitri, Annalia Frongia, Marika Pane, Eugenio Mercuri, Marco Tartaglia, Enrico Bertini

Research output: Contribution to journalArticlepeer-review

Abstract

Inositol polyphosphate-5-phosphatase K [INPP5K (MIM: 607875)] acts as a PIP3 5-phosphatase and regulates actin cytoskeleton, insulin, and cell migration. Biallelic pathogenic variants in INPP5K have recently been reported in patients affected by a form of muscular dystrophy with childhood onset. Affected patients have limb girdle muscle weakness, often associated with bilateral cataracts, short stature, and intellectual disability. Here we report four patients affected by INPP5K-related muscle dystrophy, who were apparently unrelated but originated from the same geographical area in South Italy. These patients manifest a recognizable phenotype characterized by early onset muscular dystrophy associated with short stature and intellectual disability. All affected subjects were homozygous or compound heterozygous for the c.67G > A (p.Val23Met) missense change and shared a common haplotype, indicating the occurrence of a founder effect.

Original languageEnglish
Article number565868
JournalFrontiers in Genetics
Volume11
DOIs
Publication statusPublished - Sep 18 2020

Keywords

  • cataract
  • CMD
  • INPP5K
  • LGMD
  • short stature

ASJC Scopus subject areas

  • Molecular Medicine
  • Genetics
  • Genetics(clinical)

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