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先天性巨结肠患者SEMA3C/SEMA3D基因错义突变对Semaphorin 3蛋白表达的影响 被引量:3

Effect of Missense Mutation in SEMA3C/SEMA3D Gene Detected in Hirschsprung Disease Patients on Semaphorin 3 Protein Expression
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摘要 目的明确先天性巨结肠患者携带的5个SEMA3C/SEMA3D基因错义突变对Semaphporin 3蛋白表达的影响作用。方法将野生型和突变型AP-tagged SEMA3质粒分别转染HEK293T细胞,72h后收集细胞培养液上清并提取细胞总蛋白,利用融合蛋白N-末端含有的碱性磷酸酶在底物PNPP存在时可以发生颜色变化的特性,通过对各野生型和突变型质粒转染后所表达的AP-SEMA3蛋白在特定波长的吸光值进行检测以达到蛋白定量的目的。结果 5个错义突变中的4个(SEMA3C:V337M;SEMA3D:H424Q、V457I、P615T)都会不同程度地影响相应Semaphorin 3蛋白的表达和分泌,说明它们可能通过严重影响蛋白的表达量而妨碍蛋白功能的正常行使。结论 Semaphorin 3作为一类经典的神经元轴突导向因子,很可能参与了肠神经系统的发育调控并在功能失常的情况下引发先天性巨结肠缺陷表型。 Objective To dissect the effect of missense mutation in SEMA3C/SEMA3D gene detected in Hirschsprung disease (HSCR) patients on Semaphorin 3 protein expression. Methods We used transient transfeetions of wild - type and mutant AP - SE- MA3C/3D fusion protein constructs into HEK293T cells to measure concentrations of the secreted and expressed Sema ligands using co]orl- metric assays. Results Four (SEMA3C: V337M ; SEMA3D : H424Q, V457I, P615T) out of five HSCR variants showed marked reduc- tions in protein expression and secretion. Conclusion As classical axon guidance cues, Semaphorin 3 family members may participate in manipulating the development of the enteric nervous system, and exert pathological roles in predisposing people to HSCR.
出处 《医学研究杂志》 2015年第2期55-59,共5页 Journal of Medical Research
基金 国家自然科学基金青年科学基金资助项目(81300266) 北京市自然科学基金资助项目(面上项目)(7142029) 北京市优秀人才培养个人项目(2013D003034000007)
关键词 先天性巨结肠 SEMAPHORIN 3基因 错义突变 碱性磷酸酶 蛋白表达 Hirschsprung disease~ Semaphorin 3 gene Missense mutation Alkaline phosphatase Protein expression
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