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机构地区:[1]第三军医大学西南医院 西南眼科医院重庆市视觉损伤与再生修复重点实验室,重庆400038
出 处:《中华实验眼科杂志》2014年第8期756-759,共4页Chinese Journal Of Experimental Ophthalmology
基 金:国家重点基础研究发展计划(973计划)项目(2013CB967002)
摘 要:结晶样视网膜变性(BCD)是一种常染色体隐性遗传的视网膜退行性疾病,其致病基因为CYP4V2,常见的突变位点是C.802- 810dell7insGC(Exon7del)、C.992A〉C(P.H331P)和C.1091-2A〉G(Exon9del),基因突变形式多样。GYP4V2基因属于细胞色素氧化酶P450家族,编码蛋白CYP4V2,主要发挥脂肪酸的ω氢基化作用。CYP4V2是眼部最主要的发挥多不饱合脂肪酸催化作用的细胞色素氧化酶,其内源性的底物是ω-3族多不饱合脂肪酸,在眼部主要为二十二碳六烯酸(DHA)。了解和研究CYP4V2基因突变导致BCD的发病机制在该病的基因诊断和治疗研究中具有重要意义。就BCD的分子病因学、CYP4V2酶的生化特性和CYP4V2基因突变导致BCD发病机制的研究进展进行综述。Bietti crystalline corneoretinal dystrophy (BCD) is a common form of hereditary retinal degeneration in Chinese. Mutation of the cytochrome P450 4V2 ( CYP4V2 ) gene, a novel family member of the cytochrome P450 genes on chromosome 4q35 ,has been identified in BCD patients,with the common mutation locus at c. 802-8_810dellTinsGC ( ExonTdel), c. 992A 〉 C ( p. H331P) and c. 1091-2A 〉 G ( Exon 9del). CYP4V2 is responsible for oxidation of various substrates in the metabolic pathway,especially co-hydroxylase activity towards co-3 polyunsaturated fatty acids (PUFAs). CYP4V2 appears to be the only CYP4 memeber at significant levels in retinal cells, and it may be a prominent contributor to local metabolism of PUFAs, mainly DHA (C22:6n-3 ) ,in retinal cells. To understand and investigate the main mechanism of CYP4V2 gene mutation causing BCD is important in the study of genetic diagnosis and genetic management of BCD. This review summarized the current advance in the genetic mechanism of BCD and function of CYP4V2 gene,elucidated the substrate specificity and unraveled the biochemical pathways that may impact function of CYP4V2 in BCD patients.
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