PIGQ glycosylphosphatidylinositol-anchored protein deficiency: Characterizing the phenotype

Lois J. Starr, Jürgen W. Spranger, Vamshi K. Rao, Richard Lutz, Anji T. Yetman

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


PIGQ (OMIM *605754) encodes phosphatidylinositol glycan biosynthesis class Q (PIGQ) and is required for proper functioning of an N-acetylglucosamine transferase complex in a similar manner to the more established PIGA, PIGC, and PIGH. There are two previous patients reported with homozygous and apparently deleterious PIGQ mutations. Here, we provide the first detailed clinical report of a patient with heterozygous deleterious mutations associated with glycosylphosphatidylinositol-anchored protein (GPI-AP) biosynthesis deficiency. Our patient died at 10 months of age. The rare skeletal findings in this disorder expand the differential diagnosis of long bone radiolucent lesions and sphenoid wing dysplasia. This clinical report describes a new and rare disorder—PIGQ GPI-AP biosynthesis deficiency syndrome.

Original languageEnglish (US)
Pages (from-to)1270-1275
Number of pages6
JournalAmerican Journal of Medical Genetics, Part A
Issue number7
StatePublished - Jul 2019


  • PIGQ
  • bone lesion
  • developmental delay
  • inherited glycosylphosphatidylinositol-anchored protein (GPI-AP) deficiency
  • sphenoid wing dysplasia

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)


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