縫隙連接蛋白50基因V44A突變致先天性白內(nèi)障的機制研究
[Abstract]:Objective: the aim of this study is to locate the disease-related candidate genes and to clone the target genes in vitro in order to locate the proteins in a congenital special phenotypic cataract family. Detection of gap junction half-channel function and gap junction channel function to explore the mechanism of congenital cataract caused by this mutation. Methods: gene screening: a family with congenital cataract was collected. All family members underwent eye slit lamp examination, peripheral blood samples were taken and genomic DNA. was extracted. The anterior capsule and lens samples were collected, and the ultrastructural changes of lens were observed. The candidate genes associated with phenotypes of the family were amplified by polymerase chain reaction (PCR) and sequenced. A total of 100 healthy Chinese were used as negative controls for genomic DNA. According to the above results, the secondary structure and tertiary structure of wild and mutant histone were analyzed by Antheprot4.3 and Swiss-model software. Gene function research: GJA8 gene was obtained from human lens cDNA library, cloned and recombined into pEGFP-N1 plasmid to construct wild type plasmid Cx50-EGFP.. Construction of Mutant plasmid Cx50V44A-EGFP. by site-directed Mutagenesis Wild-type plasmid, mutant plasmid and blank plasmid (pEGFP-N1) were transfected into Hek-293 cells respectively. The cell lines stably transfected with each group of plasmids were obtained by G418 screening. Protein localization and gap junction formation were observed in stable transfected cells. Under the condition of low calcium, physiological calcium and Connexin channel inhibitor, polar dye staining and patch clamp technique were used to detect the difference of half-channel function in each group. In physiological calcium environment, single cell injection and dye diffusion test were used to detect the function difference of gap junctional channels in each group. Results: the cataract phenotype of this family is nuclear opacification, but does not involve the "Y" suture, without other eye diseases or systemic diseases, the genetic pattern is autosomal dominant inheritance. Gene sequencing revealed that thymine was converted into cytosine (c.131TC) at position 131 of GJA8 gene cDNA in this family. The mutation resulted in the conversion of 44 amino acids of Cx50 protein expressed in GJA8 gene from valine to alanine (p.V44A). However, the mutation was not found in 100 Chinese normal Chinese and normal controls. A Hek293 cell line stably transfected with Cx50-EGFP, Cx50V44A-EGFP,pEGFP-N1 plasmid was successfully established. Gap junctions were observed in wild cells and mutant cells, and there was no significant difference in the number of gap junctions. In the half-channel function test, the wild group cells could absorb DAPI and PI dyes in low calcium environment, but the mutant group and blank group cells could not, while in the physiological calcium and Cx channel inhibitor environment, all the three groups cells could not absorb the dyes. Whole-cell patch clamp assay showed that the cell surface current in wild group was significantly higher than that in mutant group in low calcium environment. In the detection of gap junction channel function, 4%neurobiotin was diffused in wild group and mutant group, while 5%Lucifer yellow was only diffused in wild group. Conclusion: in this study, we first found that the c.131TC mutation of GJA8 gene leads to a special phenotype of congenital cataract, which is nuclear turbid but does not involve the "Y" suture. Gene function studies showed that the mutation of Connexin50 protein V44A did not affect the expression of gap junctions, but affected the opening of gap junction half-channel and gap junction channel, and the alteration of channel function directly led to the occurrence of congenital cataract.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2013
【分類號】:R776.1
【共引文獻】
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