Identification and functional analysis of a novel missense mutation in GJA8, p.Ala69Thr.

Abstract:

BACKGROUND:To explore the molecular genetic cause of a four-generation autosomal dominant congenital cataract family in China. METHODS:Targeted region sequencing was performed to screen for the potential mutation, and Sanger sequencing was used to confirm the mutation. The homology model was constructed to identify the protein structural change, PolyPhen-2 and Provean were used to predict the mutation impact. Functional and cellular analysis of the wild and mutant GJA8 were performed in DF-1 cells by western blotting, dye uptake assay, immunofluorescence, Annexin V-FITC staining. RESULTS:A novel heterozygous mutation (c.205G > A; p.Ala69Thr) was identified within GJA8, which cosegregated with congenital cataract phenotype in this family. Bioinformatics analysis showed the mutation was located in a highly conserved region, and the mutation was predicted to be pathogenic. Function analysis indicated that the mutation inhibited GJA8 hemichannel activity, reduced cell tolerance to oxidative stress, changed the protein distribution pattern and inhibited the cell growth. CONCLUSIONS:We have identified a novel missense mutation in GJA8 (c.205G > A, p.Ala69Thr) in a four-generation Chinese family and our results will further broaden the gene mutation spectrum of GJA8.

journal_name

BMC Ophthalmol

journal_title

BMC ophthalmology

authors

Li D,Xu C,Huang D,Guo R,Ji J,Liu W

doi

10.1186/s12886-020-01725-1

subject

Has Abstract

pub_date

2020-11-20 00:00:00

pages

461

issue

1

issn

1471-2415

pii

10.1186/s12886-020-01725-1

journal_volume

20

pub_type

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