中国南方人群家族性偏瘫型偏头痛家系CACNA1A基因多态性相关研究

摘要

背景:偏头痛与遗传学之间的联系早已受到关注,遗传流行病学和分离研究证实,偏头痛存在显著的遗传危险性.目的:通过检测偏头痛患者和家族性偏瘫型偏头痛家族外周血CAC-NA1A基因3个常见的突变位点,分析探讨中国南方人群家族性偏瘫型偏头痛与CACNA1A基因突变之间的关系.设计:抽样调查.单位:中山大学附属第一医院和深圳市宝安西乡人民医院.对象:所有病例均来源中山大学附属第一医院门诊和深圳市宝安西乡人民医院.①家族性偏瘫型偏头痛患者组10例患者.②家族性偏瘫型偏头痛亲属组:家系A和B共12例.③无家族性偏瘫型偏头痛家族史的偏头痛患者组53例.④健康对照10名.方法:采用聚合酶链反应扩增CACNL1A4基因的第13,16,17外显子.采用SSCP方法对2个家族性偏瘫型偏头痛家族10例患者及12名无症状亲属和53例无家族性偏瘫型偏头痛家族史的有先兆偏头痛患者及10名健康对照的外周血标本进行检测,分析CACNA1A基因的3个常见突变位点(T666M,R583Q和D715E)在家族性偏瘫型偏头痛家族中的表现形式.主要观察指标:①聚合酶链反应扩增CACNL1A4基因第13,16,17外显子的结果.②SSCP分析13,16,17外显子的突变结果.结果:参加实验的家族性偏瘫型偏头痛患者10例,家族性偏瘫型偏头痛亲属12例,无家族性偏瘫型偏头痛家族史的偏头痛患者53例,健康对照组10名,均进入结果分析.①第13,16,17外显子的目的片段长度分别为247,268,204 bp.②CACNA1A基因3个常见的突变T666M,R583Q和D715E在2个家族性偏瘫型偏头痛家族10例家族性偏瘫型偏头痛患者,12名无症状亲属和53例无家族性偏瘫型偏头痛家族史的有先兆偏头痛患者及10名健康对照者中均未检测到.结论:在中国人群家族性偏瘫型偏头痛家族中未发现有T666M,R583Q和D715E3个突变.%BACKGROUND: The involvement of genetic factors in migraine has been under close investigation, and geneiic epidemiological study and segregation analysis have confirmed genetic disposition as an important risk factor for migraine.OBJECTIVE: To analyze the connection between mutations in CACNA1A gene and familial hemiplegic migraine (FHM) in southern Chinese Han patients by examining the three most frequently mutated sites in CACN1A gene.DESIGN: Sampled survey.SETTING: First Affiliated Hospital of Zhongshan University and Baoan Xixiang People's Hospital of Shenzhen City.PARTICIPANTS: All the participants were selected from patients in the above two hospitals and their relatives, including 10 patients with FHM, 12 relatives of the patients in 2 pedigrees, 53 migraine patients with aura without family history, and 10 healthy control subjects.METHODS: The exons 13, 16 and 17 of CACNL1A4 gene were amplified by PCR. Single-strand conformation polymorphism technique was employed to detect the most frequent mutations in the 3 exons (T666M, R583Q and D715E) in these subjects.MAIN OUTCOME MEASURES: ① Results of PCR amplification of the 3 exons of CACNL1A4 gene; ② Results of SSCP for mutation analysis of the 3 exons.RESULTS: Participants completed the study. The target fragment length of exons 13, 16 and 17 were 247 bp, 268 bp and 204 bp, respectively.None of mutations of T666M, R583Q and D715E were detected in the subjects, including FHM patients and their relatives, migraine patients without family history and the healthy control subjects.CONCLUSION: None of the 3 most frequent mutations (T666M, R583Q and D715E) can be detected in southern Chinese FHM pedigrees or migraine patients without family history.