Abstract
目的探讨蛋白C缺陷症的分子发病机制。方法对4例蛋白C缺陷症患者进行常规诊断和基因分析。结果①例1,女,40岁。临床诊断:左下肢深静脉血栓形成。蛋白C活性(PC∶C)48%,蛋白S活性(PS∶C)26.3%,抗凝血酶活性(AT∶C) 75.6%。基因检测结果:蛋白C基因(PROC)启动子C5156T杂合突变、2号外显子区域存在A6578T杂合突变。给予抗凝、溶栓、滤器植入等治疗,症状好转出院。②例2,女,32岁。临床诊断:双下肢深静脉血栓,双上、下肢缺血,双下肢皮肤软组织感染。PC∶C 27%,PS∶C 22.9%,AT∶C 86.7%。基因检测结果:PROC基因启动子C5156T杂合突变、A5045T杂合突变。给予抗凝、抗感染等治疗,因呼吸衰竭、感染性休克、DIC死亡。③例3,女,28岁。临床诊断:右髂静脉及股深静脉血栓。PC∶C 58%,PS∶C 57.3%,AT∶C 80.8%。基因检测结果:PROC启动子C4867T杂合突变,7号外显子12702-12704 AGA (Arg192)或12705-12707 AGA(Arg193)杂合缺失,9号外显子G15240A杂合突变。给予抗凝、溶栓、滤器植入等治疗,症状好转出院。④例4,男,30岁。临床诊断:左下肢深静脉血栓,双下肺动脉栓塞伴双下肺梗死。PC∶C 50%,PS∶C 75.0%,AT∶C 89.1%。基因检测结果:PROC启动子C4867T纯合突变、G4880A纯合突变和A5045T杂合突变,2号外显子T6589C杂合突变。给予抗凝、溶栓、滤器植入等相关治疗,症状好转出院。⑤多态性分析:PROC基因启动子C4867T杂合突变、G4880A纯合突变、C5156T杂合突变为PROC启动子多态性位点。结论PROC启动子多态性位点G4880A、C4867T、C5156T,错义突变A5045T、A6578T、G15240A,缺失突变AGA12702-12704del或12705-12707del可能与蛋白C缺陷症有关。PROC启动子错义突变A5045T、A6578T、G15240A,缺失突变AGA12702-12704del或12705-12706del是国际首次报告。
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