Evidence of a third ADPKD locus is not supported by re-analysis of designated PKD3 families

Binu M. Paul, Mark B. Consugar, Moonnoh Ryan Lee, Jamie L. Sundsbak, Christina M. Heyer, Sandro Rossetti, Vickie J. Kubly, Katharina Hopp, Vicente E. Torres, Eliecer Coto, Maurizio Clementi, Nadja Bogdanova, Edgar De Almeida, Daniel G. Bichet, Peter C. Harris

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Mutations to PKD1 and PKD2 are associated with autosomal dominant polycystic kidney disease (ADPKD). The absence of apparent PKD1/PKD2 linkage in five published European or North American families with ADPKD suggested a third locus, designated PKD3. Here we re-evaluated these families by updating clinical information, re-sampling where possible, and mutation screening for PKD1/PKD2. In the French-Canadian family, we identified PKD1: p.D3782-V3783insD, with misdiagnoses in two individuals and sample contamination explaining the lack of linkage. In the Portuguese family, PKD1: p.G3818A segregated with the disease in 10 individuals in three generations with likely misdiagnosis in one individual, sample contamination, and use of distant microsatellite markers explaining the linkage discrepancy. The mutation PKD2: c.213delC was found in the Bulgarian family, with linkage failure attributed to false positive diagnoses in two individuals. An affected son, but not the mother, in the Italian family had the nonsense mutation PKD1: p.R4228X, which appeared de novo in the son, with simple cysts probably explaining the mother's phenotype. No likely mutation was found in the Spanish family, but the phenotype was atypical with kidney atrophy in one case. Thus, re-analysis does not support the existence of a PKD3 in ADPKD. False positive diagnoses by ultrasound in all resolved families shows the value of mutation screening, but not linkage, to understand families with discrepant data.

Original languageEnglish (US)
Pages (from-to)383-392
Number of pages10
JournalKidney international
Volume85
Issue number2
DOIs
StatePublished - Feb 2014

Keywords

  • ADPKD
  • molecular genetics
  • polycystic kidney disease

ASJC Scopus subject areas

  • Nephrology

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    Paul, B. M., Consugar, M. B., Ryan Lee, M., Sundsbak, J. L., Heyer, C. M., Rossetti, S., Kubly, V. J., Hopp, K., Torres, V. E., Coto, E., Clementi, M., Bogdanova, N., De Almeida, E., Bichet, D. G., & Harris, P. C. (2014). Evidence of a third ADPKD locus is not supported by re-analysis of designated PKD3 families. Kidney international, 85(2), 383-392. https://doi.org/10.1038/ki.2013.227