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Evidence for pathogenicity of atypical splice mutations in autosomal dominant polycystic kidney disease.


ABSTRACT: BACKGROUND AND OBJECTIVES: Mutation-based molecular diagnostics of autosomal dominant polycystic kidney disease (ADPKD) is complicated by locus and allelic heterogeneity, large multi-exon gene structure and duplication in PKD1, and a high level of unclassified variants. Comprehensive screening of PKD1 and PKD2 by two recent studies have shown that atypical splice mutations account for 3.5% to 5% of ADPKD. We evaluated the role of bioinformatic prediction of atypical splice mutations and determined the pathogenicity of an atypical PKD2 splice variant from a multiplex ADPKD (TOR101) family. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: Using PubMed, we identified 17 atypical PKD1 and PKD2 splice mutations. We found that bioinformatics analysis was often useful for evaluating the pathogenicity of these mutations, although RT-PCR is needed to provide the definitive proof. RESULTS: Sequencing of both PKD1 and PKD2 in an affected subject of TOR101 failed to identify a definite mutation, but revealed several UCVs, including an atypical PKD2 splice variant. Linkage analysis with microsatellite markers indicated that TOR101 was PKD2-linked and IVS8 + 5G-->A was shown to cosegregate only with affected subjects. RT-PCR of leukocyte mRNA from an affected subject using primers from exons 7 and 9 revealed six splice variants that resulted from activation of different combinations of donor and acceptor cryptic splice sites, all terminating with premature stop codons. CONCLUSIONS: The data provide strong evidence that IVS8 + 5G-->A is a pathogenic mutation for PKD2. This case highlights the importance of functional analysis of UCVs.

SUBMITTER: Wang K 

PROVIDER: S-EPMC2637591 | biostudies-literature | 2009 Feb

REPOSITORIES: biostudies-literature

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Evidence for pathogenicity of atypical splice mutations in autosomal dominant polycystic kidney disease.

Wang Kiarong K   Zhao Xiao X   Chan Shelly S   Cil Onur O   He Ning N   Song Xuewen X   Paterson Andrew D AD   Pei York Y  

Clinical journal of the American Society of Nephrology : CJASN 20090121 2


<h4>Background and objectives</h4>Mutation-based molecular diagnostics of autosomal dominant polycystic kidney disease (ADPKD) is complicated by locus and allelic heterogeneity, large multi-exon gene structure and duplication in PKD1, and a high level of unclassified variants. Comprehensive screening of PKD1 and PKD2 by two recent studies have shown that atypical splice mutations account for 3.5% to 5% of ADPKD. We evaluated the role of bioinformatic prediction of atypical splice mutations and d  ...[more]

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