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三个石骨症致病基因内的新突变及其基因型-表型[J]. 中山大学学报(医学科学版), 2016,37(5).
Three Novel Pathogenic Mutations in Osteopetrosis Genes TCIRG1 and CLCN7 and the Genotype -Phenotype Studies[J]. Journal of Sun Yat-sen University (Medical Sciences), 2016, 37(5).
【目的】 对2例恶性石骨症以及1例ADOⅡ型石骨症患者的致病基因TCIRG1及CLCN7进行致病性突变的研究,以扩展突变谱,为开发针对突变类型的产前诊断性芯片的设计提供数据支持。【方法】 收集3名石骨症患者及其父母的外周血,提取DNA,PCR扩增TCIRG1及CLCN7基因的所有外显子及剪切位点序列,对PCR产物进行Sanger测序并进行生物信息学分析,同时对新发现的突变在50名正常对照中进行测序,以排除良性多态性。【结果】 在患者1的TCIRG1基因第4外显子发现缺失突变c.242delC (p.Pro81ArgfsX85),在第9外显子检测到缺失突变c.965delC (p.Arg323GlyfsX23);在患者2的TCIRG1基因第11外显子发现错义突变c.1213G>A(p.Gly405Arg),第18外显子检测到无义突变c.2181C>A(p.Cys727X);在家系3先证者的CLCN7基因发现无义突变c.1641C>A(p.Trp547X)。其中,TCIRG1基因中的c.965delC (p.Arg323GlyfsX23)和c.2181C>A(p.Cys727X),CLCN7基因中的c.1641C>A(p.Trp547X)均为新突变。【结论】 发现TCIRG1基因中2个新突变c.965delC (p.Arg323GlyfsX23)和c.2181C>A(p.Cys727X),2个已报道的突变c.242delC (p.Pro81ArgfsX85)及c.1213G>A( p.Gly405Arg),发现CLCN7基因的1个新突变c.1641C>A(p.Trp547X),丰富了TCIRG1及CLCN7基因突变谱,为阐明石骨症的发病机制以及针对本病的诊断性芯片的设计提供了新数据。
【Objective】 To investigate the causative mutations of TCIRG1 and CLCN7 gene in three sporadic osteopetrosis patients. This is aimed to expand the mutational spectrum of these genes and to provide data for the design of microarrays for prenatal diagnosis for this lethal/disabling disease, which is the best way to prevent patients from being born, as there is currently no cure to the disease. 【Methods】 Genomic DNA was extracted from peripheral blood of the patients and their parents. All exons and the splice sites of TCIRG1 and CLCN7 gene were amplified by polymerase chain reaction (PCR) followed by Sanger sequencing. 50 healthy unrelated subjects were also sequenced for the novel mutation identified in the genesas controls. 【Results】 Three novel mutations were identified. In TCIRG1 gene, we identified two novel mutations c.965delC (p.Arg323GlyfsX23) and c.2181C>A(p.Cys727X) and the two known mutations c.242delC (p.Pro81ArgfsX85) and c.1213G>A(p.Gly405Arg). The two novel mutations truncate 486 and 104 amino acids at the C-terminal of the protein respectively and wipe out part of ATPase V0 complex. These mutations were predicted to result in loss of function of the encoded protein. In CLCN7 gene, the novel mutation c.1641C>A(p.Trp547X) was identified, which truncates 259 amino acids from the C-terminus and resulting in the loss of two transmembrane domains and two domains in cystathionine β-synthase. These novel mutations were absent in 50 control subjects. 【Conclusions】 We detected three novel mutations, c.965delC (p.Arg323GlyfsX23), c.2181C>A(p.Cys727X) in TCIRG1 and c.1641C>A(p.Trp547X) in CLCN7. Our data provide novel information for the mutational spectrum of the genes, which are applicable in the design of microarrays for genetic testing and diagnosis. Our data also provide insight into the pathogenesis of the disease.
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