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亨廷顿舞蹈病的临床特点与基因诊断(附一个家系报告) 被引量:4

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摘要 目的对一个临床拟诊为亨廷顿舞蹈病(Huntington′s disease,HD)家系进行IT15基因诊断,探讨IT15基因中CAG的重复拷贝数与发病年龄、临床特征之间的关系,提供遗传咨询并综述亨廷顿舞蹈病治疗的最新进展。方法收集该家系详细的临床资料,抽取该家系成员外周静脉血提取DNA,采用PCR、电泳技术以及DNA直接测序方法 ,并进行文献复习。结果家系调查发现该家族共28人,有6例患者,男3例,女3例,平均起病年龄54.3岁。呈父系遗传,第Ⅰ代起病年龄71岁,第Ⅱ代平均起病年龄59岁,第Ⅲ代平均起病年龄39岁。6例均以不自主舞蹈样动作起病,逐渐加重,其中4例晚期伴痴呆。有11例成员参与基因测序,包含2名有症状成员Ⅱ9和Ⅲ4(Ⅱ9起病年龄为62岁,Ⅲ4起病年龄为43岁)。实验结果发现参与成员中有3例(Ⅱ9、Ⅲ4和1例无症状成员Ⅳ1)PCR扩增后电泳显示两条扩增带,一条长约220 bp,另一条长约300 bp,Ⅱ9、Ⅲ4和Ⅳ1的CAG重复数目分别为17/40、17/45、16/48;其他8名成员显示一条扩增带,长约220 bp左右,CAG重复数目在20次以下。结论该家系根据临床表现和基因检测可确诊为亨廷顿舞蹈病,有1例症状前患者,建议该患者将来孕前期行产前基因检测。发病年龄与IT 15基因中CAG的重复拷贝数呈负相关,父系遗传有遗传早现现象。
出处 《中国神经精神疾病杂志》 CAS CSCD 北大核心 2012年第7期431-434,共4页 Chinese Journal of Nervous and Mental Diseases
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同被引文献58

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