A loss-of-function model for cystogenesis in human autosomal dominant polycystic kidney disease type 2

Roser Torra, Cèlia Badenas, José L. San Millán, Laureano Pérez-Oller, Xavier P. Estivill, Alejandro Darnell

Research output: Contribution to journalArticle

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Abstract

Autosomal dominant polycystic kidney disease (ADPKD) is genetically heterogeneous, with at least three chromosomal loci (PKD1, PKD2, and PKD3) that account for the disease. Mutations in the PKD2 gene, on the long arm of chromosome 4, are expected to be responsible for ~15% of cases of ADPKD. Although ADPKD is a systemic disease, it shows a focal expression, because <1% of nephrons become cystic. A feasible explanation for the focal nature of events in PKD1, proposed on the basis of the two-hit theory, suggests that cystogenesis results from the inactivation of the normal copy of the PKD1 gene by a second somatic mutation. The aim of this study is to demonstrate that somatic mutations are present in renal cysts from a PKD2 kidney. We have studied 30 renal cysts from a patient with PKD2 in which the germline mutation was shown to be a deletion that encompassed most of the disease gene. Loss-of-heterozygosity (LOH) studies showed loss of the wild-type allele in 10% of cysts. Screening of six exons of the gene by SSCP detected eight different somatic mutations, all of them expected to produce truncated proteins. Overall, ≥37% of the cysts studied presented somatic mutations. No LOH for the PKD1 gene or locus D3S1478 were observed in those cysts, which demonstrates that somatic alterations are specific. We have identified second-hit mutations in human PKD2 cysts, which suggests that this mechanism could be a crucial event in the development of cystogenesis in human ADPKD- type 2.

Original languageEnglish
Pages (from-to)345-352
Number of pages8
JournalAmerican Journal of Human Genetics
Volume65
Issue number2
DOIs
Publication statusPublished - 1999
Externally publishedYes

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Autosomal Dominant Polycystic Kidney
Cysts
Mutation
Genes
Loss of Heterozygosity
Kidney
Single-Stranded Conformational Polymorphism
Chromosomes, Human, Pair 4
Germ-Line Mutation
Nephrons
Exons
Alleles
Proteins

ASJC Scopus subject areas

  • Genetics

Cite this

A loss-of-function model for cystogenesis in human autosomal dominant polycystic kidney disease type 2. / Torra, Roser; Badenas, Cèlia; San Millán, José L.; Pérez-Oller, Laureano; Estivill, Xavier P.; Darnell, Alejandro.

In: American Journal of Human Genetics, Vol. 65, No. 2, 1999, p. 345-352.

Research output: Contribution to journalArticle

Torra, Roser ; Badenas, Cèlia ; San Millán, José L. ; Pérez-Oller, Laureano ; Estivill, Xavier P. ; Darnell, Alejandro. / A loss-of-function model for cystogenesis in human autosomal dominant polycystic kidney disease type 2. In: American Journal of Human Genetics. 1999 ; Vol. 65, No. 2. pp. 345-352.
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