A Genetic Interaction Network of Five Genes for Human Polycystic Kidney and Liver Diseases Defines polycystin-1 as the Central Determinant of Cyst Formation

Nat Genet. 2011 Jun 19;43(7):639-47. doi: 10.1038/ng.860.

Abstract

Autosomal dominant polycystic liver disease results from mutations in PRKCSH or SEC63. The respective gene products, glucosidase IIβ and SEC63p, function in protein translocation and quality control pathways in the endoplasmic reticulum. Here we show that glucosidase IIβ and Sec63p are required in mice for adequate expression of a functional complex of the polycystic kidney disease gene products, polycystin-1 and polycystin-2. We find that polycystin-1 is the rate-limiting component of this complex and that there is a dose-response relationship between cystic dilation and levels of functional polycystin-1 following mutation of Prkcsh or Sec63. Reduced expression of polycystin-1 also serves to sensitize the kidney to cyst formation resulting from mutations in Pkhd1, the recessive polycystic kidney disease gene. Finally, we show that proteasome inhibition increases steady-state levels of polycystin-1 in cells lacking glucosidase IIβ and that treatment with a proteasome inhibitor reduces cystic disease in orthologous gene models of human autosomal dominant polycystic liver disease.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis
  • Blotting, Western
  • Cell Proliferation
  • Cysts / genetics
  • Cysts / metabolism
  • Cysts / pathology*
  • Female
  • Glucosidases / genetics
  • Glucosidases / metabolism*
  • Immunoenzyme Techniques
  • Immunoprecipitation
  • Intracellular Signaling Peptides and Proteins / genetics
  • Intracellular Signaling Peptides and Proteins / metabolism*
  • Liver Diseases / genetics
  • Liver Diseases / metabolism*
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Mutation
  • Polycystic Kidney Diseases / genetics
  • Polycystic Kidney Diseases / metabolism*
  • Receptors, Cell Surface / genetics
  • Receptors, Cell Surface / metabolism*
  • TRPP Cation Channels / genetics
  • TRPP Cation Channels / metabolism*

Substances

  • Intracellular Signaling Peptides and Proteins
  • Pkhd1 protein, mouse
  • Prkcsh protein, mouse
  • Receptors, Cell Surface
  • TRPP Cation Channels
  • polycystic kidney disease 1 protein
  • polycystic kidney disease 2 protein
  • Glucosidases

Supplementary concepts

  • Polycystic liver disease