ND3基因10191T&gt;C突变导致的线粒体呼吸链复合物Ⅰ缺陷

刘玉鹏; 马艳艳; 吴桐菲; 王峤; 孔庆鹏; 魏晓琼; 张尧; 宋金青; 常杏芝; 张月华; 肖江喜; 杨艳玲

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中国当代儿科杂志 ›› 2012, Vol. 14 ›› Issue (08) : 561-566.

疑难病研究

ND3基因10191T>C突变导致的线粒体呼吸链复合物Ⅰ缺陷

刘玉鹏，马艳艳，吴桐菲，王峤，孔庆鹏，魏晓琼，张尧，宋金青，常杏芝，张月华，肖江喜，杨艳玲

作者信息 +

Mitochondrial respiratory chain complex I deficiency due to 10191T>C mutation in ND3 gene

LIU Yu-Peng, MA Yan-Yan, WU Tong-Fei, WANG Qiao, KONG Qing-Peng, WEI Xiao-Qiong, ZHANG Yao, SONG Jin-Qing, CHANG Xing-Zhi, ZHANG Yue-Hua, XIAO Jiang-Xi, YANG Yan-Ling

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摘要

本文报道1例由于ND3基因突变导致线粒体呼吸链复合物 Ⅰ 缺陷的患儿。该患儿自6岁起出现眼睑下垂、无力、癫癎及运动倒退，呈进行性加重。血液乳酸、丙酮酸增高，脑MRI示双侧基底节对称性损害，符合Leigh综合征诊断。为明确病因，提取患儿和父母的外周血白细胞线粒体蛋白，进行氧化磷酸化酶复合物 Ⅰ～V活性测定，并提取DNA，分析编码线粒体呼吸链复合物 Ⅰ 的7个线粒体结构基因。结果显示患儿线粒体呼吸链复合物 Ⅰ 活性为33.1 nmol/min?毫克线粒体总蛋白（正常对照44.0±5.4 nmol/min?毫克线粒体总蛋白），复合物 Ⅰ 与柠檬酸合酶活性比值为19.8%（正常对照48.1%±11.0%），均降低。复合物 Ⅱ～V活性正常。患儿线粒体ND3基因10191T>C突变。其父母线粒体基因及呼吸链复合物酶活性正常。治疗后，现患者16岁，癫癎控制良好，双下肢痉挛性瘫痪，智力正常。通过外周血白细胞线粒体氧化磷酸化酶复合物活性测定及基因分析，本研究首次诊断了编码线粒体呼吸链复合物Ⅰ亚基的ND3基因10191T>C突变导致复合物Ⅰ缺陷，为Leigh综合征的发病原因提供依据。

Abstract

This study reviews a case of mitochondrial respiratory chain complex I deficiency due to the 10191T>C mutation in mitochondrial ND3 gene. The previously healthy boy progressively presented with blepharoptosis, weakness, epilepsy and motor regression at age 6 years. Elevated blood lactate and pyruvate were observed. Brain magnetic resonance imaging showed symmetrical lesions in the basal ganglia. Leigh syndrome was thus confirmed. The protein from the mitochondria and genomic DNA of the boy and his parents was collected from peripheral blood leucocytes for the activity test for mitochondrial complex I to V and genetic analysis. The results showed the activity of complex I (33.1 nmol /min in 1 milligram mitochondrial protein) was lower than normal reference value (44.0±5.4 nmol /min in 1 milligram mitochondrial protein). The ratio of complex I to citrate synthase (19.8%) was also lower than normal reference value (48%±11%). The activities of complexes Ⅱto Ⅴwere normal. 10191T>C mutation in ND3 gene of mitochondria was identified in the boy. 10191T>C mutation and complex I deficiency were not detected in his parents. At present, he is 16 years old, and of normal intelligence with spastic paralysis in both lower extremities after treatment. It is concluded that a Chinese boy with isolated complex I deficiency due to 10191T>C mutation in ND3 gene was firstly diagnosed by peripheral leukocytes mitochondrial respiratory chain enzyme assay and gene analysis. This study can provide clinical data for the nosogenesis of Leigh syndrome.

导出引用

刘玉鹏，马艳艳，吴桐菲，王峤，孔庆鹏，魏晓琼，张尧，宋金青，常杏芝，张月华，肖江喜，杨艳玲. ND3基因10191T>C突变导致的线粒体呼吸链复合物Ⅰ缺陷[J]. 中国当代儿科杂志. 2012, 14(08): 561-566

LIU Yu-Peng, MA Yan-Yan, WU Tong-Fei, WANG Qiao, KONG Qing-Peng, WEI Xiao-Qiong, ZHANG Yao, SONG Jin-Qing, CHANG Xing-Zhi, ZHANG Yue-Hua, XIAO Jiang-Xi, YANG Yan-Ling. Mitochondrial respiratory chain complex I deficiency due to 10191T>C mutation in ND3 gene[J]. Chinese Journal of Contemporary Pediatrics. 2012, 14(08): 561-566

中图分类号： R596.2

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