Journal Article

Exclusion of the candidate genes <i>ACE</i> and <i>Bcl-2</i> for six families with nephronophthisis not linked to the <i>NPH1</i> locus

Heymut Omran, Karsten Häffner, Martin Vollmer, Johannes Pigulla, Giskard Wagner, Gianluca Caridi and Friedhelm Hildebrandt

in Nephrology Dialysis Transplantation

Published on behalf of European Renal Association - European Dialysis and Transplant Assoc

Volume 14, issue 10, pages 2328-2331
Published in print October 1999 | ISSN: 0931-0509
Published online October 1999 | e-ISSN: 1460-2385 | DOI: http://dx.doi.org/10.1093/ndt/14.10.2328
Exclusion of the candidate genes ACE and Bcl-2 for six families with nephronophthisis not linked to the NPH1 locus

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Background. Nephronophthisis (NPH) is an autosomal recessively transmitted kidney disease, characterized by cyst formation at the cortico-medullary junction, and a sclerosing tubulointerstitial nephropathy. Juvenile nephronophthisis (NPH1) is the most common genetic cause of renal failure in children and maps to chromosome 2q12-q13. The responsible gene NPHP1 has been identified and encodes for nephrocystin. Not all families with NPH demonstrate linkage to that locus.

Methods. We studied six families with NPH without linkage to the NPH1 locus. In order to attempt identification of a new causative gene, the candidate genes ACE (angiotensin converting enzyme) and Bcl-2 (B cell leukaemia/lymphoma 2 gene) originating from mouse models, were examined. For the six families highly polymorphic microsatellites covering the whole candidate gene regions were haplotyped and linkage analysis was performed.

Results. Haplotype analyses of all families examined were incompatible with linkage of the disease status to ACE or Bcl-2. Linkage analysis excluded both candidate gene regions with a LOD-score of <−2.

Conclusions. This study excluded the candidate genes ACE and Bcl-2 for NPH. Additional linkage studies need to be performed in order to identify further genes responsible for nephronophthisis.

Keywords: ACE; Bcl-2; chronic renal failure; linkage analysis; nephronophthisis

Journal Article.  1856 words.  Illustrated.

Subjects: Nephrology

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