Novel mutations of ND genes in complex I deficiency associated with mitochondrial encephalopathy

被引:113
作者
Malfatti, Edoardo
Bugiani, Marianna
Invernizzi, Federica
de Souza, Carolina Fischinger-Moura
Farina, Laura
Carrara, Franco
Lamantea, Eleonora
Antozzi, Carlo
Confalonieri, Paolo
Sanseverino, Maria Teresa
Giugliani, Roberto
Uziel, Graziella
Zeviani, Massimo
机构
[1] Neurol Inst C Besta Fdn IRCCS, Unit Mol Neurogenet, I-20126 Milan, Italy
[2] Univ Siena, Sch Med, Dept Neurolog & Behav Sci, I-53100 Siena, Italy
[3] Neurol Inst C Besta Fdn IRCCS, Dept Child Neurol, Milan, Italy
[4] Hosp Clin Porto Alegre, Gen Med Serv, Porto Alegre, RS, Brazil
[5] Neurol Inst C Besta Fdn IRCCS, Dept Neuroradiol, Milan, Italy
[6] Neurol Inst C Besta Fdn IRCCS, Dept Immunol & Musc Pathol, Milan, Italy
关键词
mitochondrial encephalomyopathy; complex I deficiency; assembly; mtDNA mutation;
D O I
10.1093/brain/awm114
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Isolated Complex I (CI) deficiency, the most frequent cause of mitochondrial disease, is a clinically and genetically heterogeneous condition. Complex I is a giant multiheteromeric enzyme composed of seven ND subunits encoded by mitochondrial DNA (mtDNA) genes, and at least 38 subunits encoded by nuclear genes. To establish the contribution to human mitochondrial encephalopathy of ND versus nuclear gene mutations, we have been undertaking a systematic analysis of CI genes in a cohort of 46 adult and paediatric patients with biochemically defined CI defect. Sequence analysis of the entire mtDNA let us identify six patients with mutations in ND genes. The clinical presentations varied, from infantile Leigh syndrome, to childhood MELAS, to adult-onset encephalopathic syndromes of variable severity. Three of the mutations were not previously reported (3481G > A, 14600G > A and 13063G > A, in NDI, ND6 and ND5 genes, respectively) and were further investigated in mutant transmitochondrial cybrids. Tight correlation between mutation load and decrease in CI activity was observed in each of the three mutant cybrid lines, supporting the pathogenic role of the novel mutations. Structural studies on mutant cybrids showed impaired assembly or reduced stability of the holoenzyme complex. In our experience ND gene mutations are relatively common in CI-defective mitochondrial encephalopathy of both children and adults.
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页码:1894 / 1904
页数:11
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