A genetic interaction network of five genes for human polycystic kidney and liver diseases defines polycystin-1 as the central determinant of cyst formation

SV Fedeles, X Tian, AR Gallagher, M Mitobe, S Nishio… - Nature …, 2011 - nature.com
SV Fedeles, X Tian, AR Gallagher, M Mitobe, S Nishio, SH Lee, Y Cai, L Geng, CM Crews
Nature genetics, 2011nature.com
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 …
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.
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