4.6 Article

Mapping of a new locus for congenital anomalies of the kidney and urinary tract on chromosome 8q24

Journal

NEPHROLOGY DIALYSIS TRANSPLANTATION
Volume 25, Issue 5, Pages 1496-1501

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/ndt/gfp650

Keywords

congenital anomalies of the kidney and urinary tract (CAKUT); kidney development; total genome search for linkage; ureteropelvic junction obstruction; vesicoureteral reflux

Funding

  1. Howard Hughes Medical Institute
  2. National Institutes of Health [HD045345-01]

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Methods. Clinical data and blood samples were obtained from a Somalian family with eight individuals with CAKUT including high-grade vesicoureteral reflux and unilateral renal agenesis. Total genome search for linkage was performed using a 50K SNP Affymetric DNA microarray. As neither parent is affected, the results of the SNP array were analysed under recessive models of inheritance, with and without the assumption of consanguinity. Results. Using the non-consanguineous recessive model, a new gene locus (CAKUT1) for CAKUT was mapped to chromosome 8q24 with a significant maximum parametric Logarithm of the ODDs (LOD) score (LOD(max)) of 4.2. Recombinations were observed in two patients defining a critical genetic interval of 2.5 Mb physical distance flanked by markers SNP_A-1740062 and SNP_A-1653225. Conclusion. We have thus identified a new non-syndromic recessive gene locus for CAKUT (CAKUT1) on chromosome 8q24. The identification of the disease-causing gene will provide further insights into the pathogenesis of urinary tract malformations and mechanisms of renal development.

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