Two novel mutations affecting the same splice site of PKD1 correlate with different phenotypes in ADPKD.

Abstract:

:Genetic heterogeneity is the main factor for significant variation in the course of autosomal dominant polycystic kidney disease (ADPKD). PKD1 patients have more severe renal outcomes compared with PKD2 patients. Co-inheritance of a mutation in both genes is associated with more severe phenotypes than that found with either mutation alone. However, the genotype-phenotype relationship is far from clear in ADPKD. Here, we observed two novel mutations, PKD1:c.12444G > A and PKD1:c.12444 + 1G > A, which alter the same splice donor site of intron 45, correlate with different renal outcomes. To explain the phenomenon, we analyzed the genic and allelic background of the patients, as well as the genetic modifiers, DKK3 and HNF-1β as suggested. Only PKD1 variants were found, which highlights the allelic influence of PKD1 gene to be the last candidate factor. Segregation analysis, online mutation prediction, and recurrence mutation searching were applied to sort the variants. However, none of variants was found to be damaging or associated with the disease except PKD1:c.12444G > A and PKD1:c.12444 + 1G > A. Cloning and sequencing of the mutated cDNA sequences had shown unexpected different splicing effects caused by the mutations. PKD1:c.12444 + 1G > A definitely destroyed the native splice site and created a novel donor site with truncating effect on PC1. In contrast, PKD1:c.12444G > A mainly weakened the site and decreased the expression of normal PC1. Since PC1 negatively regulates cell proliferation in the process of cyst formation and enlargement, our observation may explain this new genotype-phenotype correlation and help to improve genetic counseling and diagnosis of the disease.

journal_name

Ren Fail

journal_title

Renal failure

authors

Yu C,Li J,Yuan Z,Liu S,Zou L

doi

10.3109/0886022X.2014.890010

subject

Has Abstract

pub_date

2014-06-01 00:00:00

pages

687-93

issue

5

eissn

0886-022X

issn

1525-6049

journal_volume

36

pub_type

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