The E368Q Mutant Allele of GJA8 is Associated with Congenital Cataracts with Intrafamilial Variation in a South Indian Family.

Autor:	Senthil Kumar G; Department of Genetics, Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, India., Dinesh Kumar K; Department of Genetics, Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, India., Minogue PJ; Department of Pediatrics, University of Chicago, USA., Berthoud VM; Department of Pediatrics, University of Chicago, USA., Kannan R; Appasamy Krishna Hospital, Velachery, India., Beyer EC; Department of Pediatrics, University of Chicago, USA., Santhiya ST; Department of Genetics, Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, India.
Jazyk:	angličtina
Zdroj:	Open access journal of ophthalmology [Open Access J Ophthalmol] 2016; Vol. 1 (1). Date of Electronic Publication: 2016 Jul 28.
Abstrakt:	Purpose: To determine the basis of the autosomal dominant congenital cataracts in a three generation south Indian pedigree. Methods: The proband and several family members underwent a complete ophthalmic examination. The coding regions of eight candidate genes ( CRYAA, CRYBB2, CRYGC, CRYGD, GJA3, GJA8, AQP0, and PITX3 ) were amplified by PCR and directly sequenced. Wild type and mutant connexin50 (Cx50) were expressed by stable transfection of HeLa cells. Their cellular distributions and function were examined by immunofluorescence microscopy and by microinjection of gap junction permeant tracers, respectively. Results: Congenital cataracts (with some variations in phenotype) segregated as an autosomal dominant trait within a three generation pedigree. Three affected individuals (proband, sibling and mother) showed a sequence variation in the candidate gene GJA8 encoding Cx50: a c.1102G>C transversion encoding a substitution of glutamate for glutamine at position 368 (E368Q). This substitution was absent from an unaffected family member (paternal aunt) and 100 healthy controls of the same ethnicity. In transfected HeLa cells, both wild type Cx50 and E368Q localized to gap junction plaques, and supported similar levels of intercellular transfer of Neurobiotin. Conclusions: The E368Q mutant allele of GJA8 is associated with autosomal dominant congenital cataracts with phenotypic variability. E368Q forms gap junction plaques and functional channels in transfected HeLa cells.
Databáze:	MEDLINE
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