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Nephrology: New gene linked to kidney disease

Date:
March 5, 2010
Source:
Journal of Clinical Investigation
Summary:
Nephronophthisis (NPHP) is the most common genetic cause of kidney failure in children. Ten causative genes (NPHP1-NPHP9 and NPHP11), all of which generate proteins that localize to a cellular complex known as the primary cilia-centrosome complex, have been identified previously. A team of researchers has now identified an association between mutations in the XPNPEP3 gene and an NPHP-like nephropathy in two consanguineous families, one in northern Finland and one in Turkey.

Nephronophthisis (NPHP) is the most common genetic cause of kidney failure in children. Ten causative genes (NPHP1-NPHP9 and NPHP11), all of which generate proteins that localize to a cellular complex known as the primary cilia-centrosome complex, have been identified previously.

A team of researchers, at the University of Michigan Health System, Ann Arbor, and Duke University Medical Center, Durham, has now identified an association between mutations in the XPNPEP3 gene and an NPHP-like nephropathy in two consanguineous families, one in northern Finland and one in Turkey.

Unlike all the known NPHP proteins, XPNPEP3 protein localizes to cellular compartments known as mitochondria. However, in vivo analysis in zebrafish indicated that XPNPEP3 protein has a role in ciliary function, as it degraded several ciliary cystogenic proteins.

The authors therefore conclude that there is a link between mitochondria and ciliary dysfunction, a key component of NPHP. As highlighted by Erwin Bφttinger, at Mount Sinai School of Medicine, New York, these data provide exciting new avenues of research for understanding ciliopathies, genetic disorders caused by damage to cellular structures known as primary cilia.

The research appears in the Journal of Clinical Investigation.


Story Source:

The above story is based on materials provided by Journal of Clinical Investigation. Note: Materials may be edited for content and length.


Journal References:

  1. O'Toole et al. Individuals with mutations in XPNPEP3, which encodes a mitochondrial protein, develop a nephronophthisis-like nephropathy. Journal of Clinical Investigation, 2010; DOI: 10.1172/JCI40076
  2. Erwin P. Bφttinger. Lights on for aminopeptidases in cystic kidney disease. Journal of Clinical Investigation, 2010; DOI: 10.1172/JCI42378

Cite This Page:

Journal of Clinical Investigation. "Nephrology: New gene linked to kidney disease." ScienceDaily. ScienceDaily, 5 March 2010. <www.sciencedaily.com/releases/2010/02/100222213128.htm>.
Journal of Clinical Investigation. (2010, March 5). Nephrology: New gene linked to kidney disease. ScienceDaily. Retrieved April 17, 2014 from www.sciencedaily.com/releases/2010/02/100222213128.htm
Journal of Clinical Investigation. "Nephrology: New gene linked to kidney disease." ScienceDaily. www.sciencedaily.com/releases/2010/02/100222213128.htm (accessed April 17, 2014).

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