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Genes 2018, 9(2), 112; https://doi.org/10.3390/genes9020112

Delineation of Novel Autosomal Recessive Mutation in GJA3 and Autosomal Dominant Mutations in GJA8 in Pakistani Congenital Cataract Families

1
Department of Clinical Genetics, Academic Medical Centre, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
2
Department of Pediatric Ophthalmology and Strabismus, Al-Shifa Eye Trust Hospital Jhelum Road, Rawalpindi 46000, Pakistan
3
Department of Human Genetics, Radboud University Medical Centre, 6525 GA Nijmegen, The Netherlands
4
Department of Ophthalmology, Academic Medical Centre, 1105 AZ Amsterdam, The Netherlands
5
Netherlands Institute for Neuroscience, (NIN-KNAW), 1105 AZ Amsterdam, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 19 January 2018 / Revised: 9 February 2018 / Accepted: 9 February 2018 / Published: 20 February 2018
(This article belongs to the Section Human Genomics and Genetic Diseases)
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Abstract

Congenital cataract is a clinically and genetically heterogeneous disease. The present study was undertaken to find the genetic cause of congenital cataract families. DNA samples of a large consanguineous Pakistani family were genotyped with a high resolution single nucleotide polymorphism Illumina microarray. Homozygosity mapping identified a homozygous region of 4.4 Mb encompassing the gene GJA3. Sanger sequence analysis of the GJA3 gene revealed a novel homozygous variant c.950dup p.(His318ProfsX8) segregating in an autosomal recessive (AR) manner. The previously known mode of inheritance for GJA3 gene mutations in cataract was autosomal dominant (AD) only. The screening of additional probands (n = 41) of cataract families revealed a previously known mutation c.56C>T p.(Thr19Met) in GJA3 gene. In addition, sequencing of the exon-intron boundaries of the GJA8 gene in 41 cataract probands revealed two additional mutations: a novel c.53C>T p.(Ser18Phe) and a known c.175C>G p.(Pro59Ala) mutation, both co-segregating with the disease phenotype in an AD manner. All these mutations are predicted to be pathogenic by in silico analysis and were absent in the control databases. In conclusion, results of the current study enhance our understanding of the genetic basis of cataract, and identified the involvement of the GJA3 in the disease etiology in both AR and AD manners. View Full-Text
Keywords: congenital cataract; homozygosity mapping; sanger sequencing; proband; GJA3 gene; GJA8; mutation; segregation congenital cataract; homozygosity mapping; sanger sequencing; proband; GJA3 gene; GJA8; mutation; segregation
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Micheal, S.; Niewold, I.T.G.; Siddiqui, S.N.; Zafar, S.N.; Khan, M.I.; Bergen, A.A.B. Delineation of Novel Autosomal Recessive Mutation in GJA3 and Autosomal Dominant Mutations in GJA8 in Pakistani Congenital Cataract Families. Genes 2018, 9, 112.

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