PuSH - Publikationsserver des Helmholtz Zentrums München: A novel <em>CRYGC</em> E128* mutation underlying an autosomal dominant nuclear cataract in a south Indian kindred.

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Kandaswamy, D.K. ; Vasantha, K.* ; Graw, J. ; Santhiya, S.T.*

A novel CRYGC E128* mutation underlying an autosomal dominant nuclear cataract in a south Indian kindred.

Ophthalmic Genet. 41, 556-562 (2020)

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Purpose To identify the mutation causing an autosomal dominant congenital nuclear cataract in a south Indian family by whole exome sequencing and to characterize further phenotypically the same in a zebra fish model. Methods A six-generation family (DKEC1) with several affected members registered at the Regional Institute of Ophthalmology (RIO), Chennai was documented to have congenital nuclear cataract. Detailed clinical history and blood samples were collected from all available family members. Genomic DNA of the proband was subjected to whole exome sequencing. Sequence variations suggestive of putative mutations were further confirmed by bidirectional sequencing and restriction site analysis. Functional analysis of the mutantCRYGCE128* in zebrafish embryos was done to dissect out the pathogenicity. Results A unique variation viz., c.382 G > T in the coding region of theCRYGCgene, resulting in a premature stop codon at position 128 (E128*) was documented in the affected family members. The same was absent in unaffected family members and in 120 unrelated population controls checked. Bioinformatic tools predicted that the mutation might cause a deleterious effect on protein structure and function. Molecular function analysis of this novel mutation (p. E128*,CRYGC) in the zebrafish indicated this mutation to impair lens transparency. Conclusion This study identified a novelCRYGCmutation, E128* to cause autosomal dominant congenital nuclear cataract in a large south Indian family. Our study provides a new insight onto how the mutation might affect the gamma C-crystallin structure and function besides emphasizing the need for genetic diagnosis toward vision restoration.

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