Association between genotype and phenotype of ABCB4 gene mutation
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摘要: ABCB4相关疾病是由于基因突变引起胆汁分泌障碍的综合征,在临床上可以导致胆管损伤、门静脉高压和肝硬化等。近年来随着遗传学和基因测序技术的发展,越来越多的突变位点被人们所发现,然而考虑到该病较为复杂,突变的致病性和致病机制目前尚不明确;而且该病为罕见病,仅通过基础研究或临床资料单方面往往难以确定ABCB4突变致病性,因此亟需建立起ABCB4基因型与表型之间的相关性,在基础研究与临床实践中构建完善体系。Abstract: ABCB4-related disease is the syndrome of bile secretion disorder caused by gene mutations and can cause bile duct injury, portal hypertension, and liver cirrhosis in clinical practice. With the development of genetics and gene sequencing techniques in recent years, more and more mutation sites have been identified; however, since this is a relatively complex disease, the pathogenicity and pathogenic mechanism of mutations remain unclear. Meanwhile, since this disease is rare, it is difficult to determine the pathogenicity of ABCB4 mutations based on basic research or clinical data. Therefore, it is urgent to establish the association between ABCB4 genotypes and phenotypes and construct a complete system in basic research and clinical practice.
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表 1 ABCB4突变功能分类及治疗
项目 严重缺陷 成熟障碍 活性降低 稳定性降低 意义未明 突变
(举例)无义突变
移码突变
缺失突变c.1621A>T(p.I541F)
c.1667T>G(p.L556R)
c.2564A>T(p.Q855L)c.1037G>T(p.S346l)
c.1069T>C(p.F357L)
c. 1605G>A(p.G535D)
c.2177C>T(p.P726L)
c.2324C>T(p.T775M)
c.2860G>A(p.G954S)
c.3228 A>T (p.S1076C)c.1270A>G(p.T424A)
c.1529A>G (p.N510S)c.1954A>G(p.R652G)
c.523A>G(p.T175A)潜在治疗
(与UDCA联用)伴侣蛋白(例如环孢菌素A) CFTR增强剂(例如依伐卡托),核受体激动剂(例如贝特类药物),他汀类 核受体激动剂(例如贝特类药物),他汀类药物 表 2 ABCB4相关疾病临床表型及突变
项目 ICP DILI LPAC PFIC3 起病时期 妊娠后期 用药相关 40岁以下 婴儿期晚期(30%)至成年期早期 突变类型 杂合 杂合 杂合 复合杂合,纯合 突变位点
(举例)c.1529 A>G(p.N510S)
c.711A>T(p.I237I)
c.1954A>G(p.R652G)c.2290A>C(p.I764L)
c.3245T>A(p.L1082Q)c.523A>G(p.T175A)
c.1954A>G(p.R652G)
c.3203T>A(p.V1068G)
c.140G>A(p.A47G)c.1376A>G(p.D459G)
c.1769G>A (p.R590Q)
c.1621A>T(p.I541F)
c.1667T>G(p.L556R)
c.1270A>G(p.T424A)
c.1529A>G(p.N510S) -
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