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Transcription Factor SIX5 Is Mutated In Patients With Branchio-Oto-Renal Syndrome

 
  March, 21 2007 8:29
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Transcription Factor SIX5 Is Mutated In Patients With Branchio-Oto-Renal Syndrome

Publication:
Am. J. Hum. Genet., 80:800-804, 2007.

Authors:
Bethan E. Hoskins, Carl H. Cramer II, Derek Silvius, Dan Zou, Richard M. Raymond Jr., Dana J. Orten, William J. Kimberling, Richard J. H. Smith, Dominique Weil, Christine Petit, Edgar A. Otto, Pin-Xian Xu, and Friedhelm Hildebrandt

Abstract:
Branchio-oto-renal syndrome (BOR) is an autosomal dominant developmental disorder characterized by the association of branchial arch defects, hearing loss, and renal anomalies. Mutations in EYA1 are known to cause BOR. More recently, mutations in SIX1, which interacts with EYA1, were identified as an additional cause of BOR. A second member of the SIX family of proteins, unc-39 (SIX5), has also been reported to directly interact with eya-1 in Caenorhabditis elegans. We hypothesized that this interaction would be conserved in humans and that interactors of EYA1 represent good candidate genes for BOR. We therefore screened a cohort of 95 patients with BOR for mutations in SIX5. Four different heterozygous missense mutations were identified in five individuals. Functional analyses of these mutations demonstrated that two mutations affect EYA1-SIX5 binding and the ability of SIX5 or the EYA1-SIX5 complex to activate gene transcription. We thereby identified heterozygous mutations in SIX5 as a novel cause of BOR.

Address for correspondence and reprints:
Dr. Friedhelm Hildebrandt, University of Michigan Health System, 8220C MSRB III, 1150 West Medical Center Drive, Ann Arbor, MI 48109-0646. E-mail: fhilde@umich.edu

Article available online.

(C) The American Journal of Human Genetics.

Posted by: Tressie Dalaya.


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