1. Submicroscopic Deletions at 13q32.1 Cause Congenital Microcoria.
- Author
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Fares-Taie, Lucas, Gerber, Sylvie, Tawara, Akihiko, Ramirez-Miranda, Arturo, Douet, Jean-Yves, Verdin, Hannah, Guilloux, Antoine, Zenteno, Juan C., Kondo, Hiroyuki, Moisset, Hugo, Passet, Bruno, Yamamoto, Ken, Iwai, Masaru, Tanaka, Toshihiro, Nakamura, Yusuke, Kimura, Wataru, Bole-Feysot, Christine, Vilotte, Marthe, Odent, Sylvie, and Vilotte, Jean-Luc
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DELETION mutation , *OLIGONUCLEOTIDE arrays , *CONGENITAL disorders , *MUSCLE cells , *GENE expression , *DYSGENESIS - Abstract
Congenital microcoria (MCOR) is a rare autosomal-dominant disorder characterized by inability of the iris to dilate owing to absence of dilator pupillae muscle. So far, a dozen MCOR-affected families have been reported worldwide. By using whole-genome oligonucleotide array CGH, we have identified deletions at 13q32.1 segregating with MCOR in six families originating from France, Japan, and Mexico. Breakpoint sequence analyses showed nonrecurrent deletions in 5/6 families. The deletions varied from 35 kbp to 80 kbp in size, but invariably encompassed or interrupted only two genes: TGDS encoding the TDP-glucose 4,6-dehydratase and GPR180 encoding the G protein-coupled receptor 180, also known as intimal thickness-related receptor (ITR). Unlike TGDS which has no known function in muscle cells, GPR180 is involved in the regulation of smooth muscle cell growth. The identification of a null GPR180 mutation segregating over two generations with iridocorneal angle dysgenesis, which can be regarded as a MCOR endophenotype, is consistent with the view that deletions of this gene, with or without the loss of elements regulating the expression of neighboring genes, are the cause of MCOR. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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