A novel GJA8 mutation (p.V44A) causing autosomal dominant congenital cataract.

Abstract

PURPOSE:

To examine the mechanism by which a novel connexin 50 (Cx50) mutation, Cx50 V44A, in a Chinese family causes suture-sparing autosomal dominant congenital nuclear cataracts.

METHODS:

Family history and clinical data were recorded and direct gene sequencing was used to identify the disease-causing mutation. The Cx50 gene was cloned from a human lens cDNA library. Connexin protein distributions were assessed by fluorescence microscopy. Hemichannel functions were analyzed by dye uptake assay. Formation of functional channels was assessed by dye transfer experiments.

RESULTS:

Direct sequencing of the candidate GJA8 gene revealed a novel c.131T>C transition in exon 2, which cosegregated with the disease in the family and resulted in the substitution of a valine residue with alanine at codon 44 (p. V44A) in the extracellular loop 1 of the Cx50 protein. Both Cx50 and Cx50V44A formed functional gap junctions, as shown by the neurobiotin transfer assay. However, unlike wild-type Cx50, Cx50V44A was unable to form open hemichannels in dye uptake experiments.

CONCLUSION:

This work identified a unique congenital cataract in the Chinese population, caused by the novel mutation Cx50V44A, and it showed that the V44A mutation specifically impairs the gating of the hemichannels but not the gap junction channels. The dysfunctional hemichannels resulted in the development of human congenital cataracts.

• Authors: Yanan Zhu, Hao Yu, Wei Wang, Xiaohua Gong, Ke Yao
• Journal: PloS one (PLoS One) Vol. 9 Issue 12 Pg. e115406 ( 2014) ISSN: 1932-6203 [Electronic] United States
• PMID: 25517998 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Connexins
• connexin 50

Topics

• Adolescent
• Adult
• Amino Acid Sequence
• Amino Acid Substitution
• Case-Control Studies
• Cataract (congenital, genetics, pathology)
• Child
• Connexins (genetics)
• Female
• Follow-Up Studies
• HeLa Cells
• Humans
• Male
• Molecular Sequence Data
• Mutation (genetics)
• Pedigree
• Sequence Homology, Amino Acid
• Young Adult