title: Identification and functional analysis of GJA8 mutation in a Chinese family with autosomal dominant perinuclear cataracts.
abstract: Congenital cataract is a clinically and genetically heterogeneous group of eye disorders that causes visual impairment and childhood blindness. The purpose of this study was to identify the genetic defect associated with autosomal dominant congenital perinuclear cataract in a Chinese family. A detailed family history and clinical data of the family were recorded, and candidate gene sequencing was performed to screen for mutation-causing disease in our study. Direct sequencing revealed a c.601G>A (p.E201K) transversion in exon 2 of GJA8. This mutation co-segregated with all affected individuals in the family and was not found in unaffected family members or 100 unrelated controls. The function and mechanism of novel GJA8 point mutation E201K in Chinese patients were then investigated in this study. We found E201K aberrantly located in cytoplasm and prevented its location in the plasma membrane. Induction of E201K expression led to a decrease in cell growth and viability by MTT (3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay. Our study provides important evidence that GJA8 is a disease-causing gene for congenital cataract and that mutation of GJA8 has a potential causative effect.
authors.affiliation: Department of Genetics, National Research Institute for Family Planning, Beiing, China.
authors.forename: Dongmei
authors.initials: D
authors.lastname: Su
authors.forename: Zhenfei
authors.initials: Z
authors.lastname: Yang
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.forename: Lina
authors.initials: L
authors.lastname: Guan
authors.forename: Huiling
authors.initials: H
authors.lastname: Zhang
authors.forename: Dandan
authors.initials: D
authors.lastname: E
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Siquan
authors.initials: S
authors.lastname: Zhu
authors.forename: Xu
authors.initials: X
authors.lastname: Ma
mesh_terms: D000595:Amino Acid Sequence; D044466:Asian People / Q000235:genetics; D002386:Cataract / Q000235:genetics*; D002462:Cell Membrane / Q000378:metabolism; D002681:China; D019295:Computational Biology; D017630:Connexins / Q000235:genetics*; D004252:DNA Mutational Analysis; D005091:Exons; D005136:Eye Proteins / Q000235:genetics*; D005260:Female; D005799:Genes, Dominant; D006367:HeLa Cells; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation; D010375:Pedigree; D017354:Point Mutation; D055815:Young Adult; D000099264:Connexin 50
chemical_list: D017630:Connexins; D005136:Eye Proteins; D000099264:Connexin 50
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