Human Molecular Genetics Advance Access originally published online on December 8, 2003
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Human Molecular Genetics, 2004, Vol. 13, No. 3 315-322
DOI: 10.1093/hmg/ddh025
Mutations in the human RAX homeobox gene in a patient with anophthalmia and sclerocornea



1Sensory Neuroscience Research Center, 2Department of Biochemistry and Molecular Pharmacology, 3Department of Ophthalmology, 4Department of Pathology and 5Department of Otolaryngology, West Virginia University School of Medicine, Morgantown, West Virginia, USA and 6Division of Genetics, Albert Einstein Medical Center, Philadelphia, Pennsylvania, USA
Received September 13, 2003; Accepted November 23, 2003
Anophthalmia and microphthalmia are among the most common ocular birth defects and a significant cause of congenital blindness. The etiology of anophthalmia and microphthalmia is diverse, with multiple genetic mutations associated with each of these conditions, along with potential environmental causes. Based on findings that mutations in the Rx/Rax homeobox genes in mice and fish lead to defects in retinal development and result in animal models of anophthalmia, we screened 75 individuals with anophthalmia and/or microphthalmia for mutations in the human RAX gene. We identified a single proband from this population who is a compound heterozygote for mutations in the RAX gene. This individual carries a truncated allele (Q147X) and a missense mutation (R192Q), both within the DNA-binding homeodomain of the RAX protein, and we have characterized the biochemical properties of these mutations in vitro. Parents and grandparents of the proband were found to be carriers without visible ocular defects, consistent with an autosomal recessive inheritance pattern. This is the first report of genetic mutations in the human RAX gene.
* To whom correspondence should be addressed at: Sensory Neuroscience Research Center, PO Box 9303, West Virginia University School of Medicine, Morgantown, WV 26506-9303, USA. Email: pmathers{at}hsc.wvu.edu
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