我国原发性开角型青光眼患者TIGR基因突变筛选、克隆及序列分析  

To screen, clone and sequence TIGR gene mutation in Chinese patients with primary open- angle glaucoma

作　　者：卓业鸿[1] 葛坚[1] 郭彦[1] 蓝育青[1] 李莉[1] 

机构地区：[1]中山医科大学中山眼科中心,广州510060

出　　处：《中华眼科杂志》2000年第6期416-419,共4页Chinese Journal of Ophthalmology

基　　金：国家自然科学基金!(39770 789;3980 0 16 3);广东省青年基金!(980 112 );国家教委博士点基金!(985 6 )资助项目

摘　　要：目的　研究我国原发性开角型青光眼 (primaryopenangleglaucoma,POAG)患者小梁网糖皮质激素诱导反应蛋白 (trabecularmeshworkinducedglucocorticoidresponseprotein ,TIGR)基因的突变情况。方法　 (1)应用聚合酶链式反应 (polymerasechainreaction ,PCR)方法扩增 70例POAG患者、2 0例正常对照组的TIGR基因 3个外显子 (7对引物 )的各个片段 ,应用单链构像多态 (single strandedconformationpolymorphism ,SSCP)筛选可能突变的PCR产物。 (2 )将筛选出的样本 (PCR产物 ) ,克隆到PT Adv载体 ,以EcorI酶切鉴定重组质粒 ,然后用ABI 373自动测序仪行双向测序。结果　 (1)用SSCP方法筛选的 2例POAG患者在TIGR基因第 3外显子中部 (第 6对引物 )片段出现单链带型异常 ;正常对照组未见异常。 (2 )克隆测序的 2例样品 ,1例在 388密码子位置出现由GAT突变为AAT ,氨基酸由天冬氨酸替换为天冬酰胺 ,即Asp388Asn ;另 1例碱基序列无变化。提示我国POAG患者TIGR基因突变仅为 1 4% (1/ 70 ) ,远较国外为低。结论　我国POAG患者的发病机制可能与TIGR基因突变有关 ,但突变率较国外低 ,提示POAG发病存在地区或种族之间的差异。Objective To study trabecular meshwork induced glucocorticoid response protein (TIGR) gene mutation in Chinese patients with primary open-angle glaucoma (POAG). Methods (1) From 70 patients with POAG and 20 normal controls, TIGR gene which consists of three exons (7 pairs of primer) was amplified by polymerase chain reaction (PCR). The mutation of PCR amplification products was evaluated by single-stranded conformation polymorphism (SSCP). (2) After the above PCR products were cloned into the PT-Adv vectors, the construction plasmids were evaluated by Ecor I endonuclease and direct sequence was performed. Results (1) With SSCP screening, the single strand band abnormality was found in the middle fragments of the third exon (the sixth pair of primer) of TIGR gene in two patients with POAG, but the control group appeared normal. (2) The two samples using clone and sequence showed that one had a 'GAT'- to- 'AAT' transition at amino acid Asp 338 Asn mutation; the base sequence of another one had no change. These results suggested that mutation rate of TIGR gene in Chinese patients with POAG be only 1.4% (1/70), being lower than that of foreigners. Conclusion The pathogenesis of Chinese patients with POAG may be related with TIGR gene mutation, but the mutation rate is lower than that in foreigners, indicating that the mechanism of POAG in China and aboard is different and the pathogenesis of POAG has difference in regions and races.

关 键 词：开角型青光眼 DNA突变 克隆 TIGR基因 序列分析 

分 类 号：R775.2[医药卫生—眼科]