A gene (PEX) with homologies to endopeptidases is mutated in patients with X-linked hypophosphatemic rickets. The HYP Consortium

Nat Genet. 1995 Oct;11(2):130-6. doi: 10.1038/ng1095-130.


X-linked hypophosphatemic rickets (HYP) is a dominant disorder characterised by impaired phosphate uptake in the kidney, which is likely to be caused by abnormal regulation of sodium phosphate cotransport in the proximal tubules. By positional cloning, we have isolated a candidate gene from the HYP region in Xp22.1. This gene exhibits homology to a family of endopeptidase genes, members of which are involved in the degradation or activation of a variety of peptide hormones. This gene (which we have called PEX) is composed of multiple exons which span at least five cosmids. Intragenic non-overlapping deletions from four different families and three mutations (two splice sites and one frameshift) have been detected in HYP patients, which suggest that the PEX gene is involved in the HYP disorder.

Publication types

  • Case Reports
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Base Sequence
  • Chromosome Mapping
  • Cloning, Molecular
  • Cosmids
  • DNA Primers
  • Endopeptidases / chemistry
  • Endopeptidases / genetics*
  • Exons
  • Female
  • Gene Deletion*
  • Genes, Dominant
  • Genetic Linkage
  • Humans
  • Hypophosphatemia, Familial / enzymology
  • Hypophosphatemia, Familial / genetics*
  • Kidney Tubules, Proximal / metabolism
  • Male
  • Molecular Sequence Data
  • Multigene Family
  • PHEX Phosphate Regulating Neutral Endopeptidase
  • Pedigree
  • Polymerase Chain Reaction
  • Protein Biosynthesis
  • Proteins / chemistry
  • Proteins / genetics*
  • Restriction Mapping
  • X Chromosome*


  • DNA Primers
  • Proteins
  • Endopeptidases
  • PHEX Phosphate Regulating Neutral Endopeptidase
  • PHEX protein, human