title: [Diagnosis of mitochondrial disorders in children with next generation sequencing].
abstract: OBJECTIVE
  To explore the application value of next generation sequencing (NGS) in the diagnosis of mitochondrial disorders.
  
  
  METHODS
  According to mitochondrial disease criteria, genomic DNA was extracted using standard procedure from peripheral venous blood of patients with suspected mitochondrial disease collected from neurological department of Beijing Children's Hospital Affiliated to Capital Medical University between October 2012 and February 2014. Targeted NGS to capture and sequence the entire mtDNA and exons of the 1 000 nuclear genes related to mitochondrial structure and function. Clinical data were collected from patients diagnosed at a molecular level, then clinical features and the relationship between genotype and phenotype were analyzed.
  
  
  RESULTS
  Mutation was detected in 21 of 70 patients with suspected mitochondrial disease, in whom 10 harbored mtDNA mutation, while 11 nuclear DNA (nDNA) mutation. In 21 patients, 1 was diagnosed congenital myasthenic syndrome with episodic apnea due to CHAT gene p.I187T homozygous mutation, and 20 were diagnosed mitochondrial disease, in which 10 were Leigh syndrome, 4 were mitochondrial encephalomyopathy with lactic acidosis and stroke like episodes syndrome, 3 were Leber hereditary optic neuropathy (LHON) and LHON plus, 2 were mitochondrial DNA depletion syndrome and 1 was unknown. All the mtDNA mutations were point mutations, which contained A3243G, G3460A, G11778A, T14484C, T14502C and T14487C. Ten mitochondrial disease patients harbored homozygous or compound heterozygous mutations in 5 genes previously shown to cause disease: SURF1, PDHA1, NDUFV1, SUCLA2 and SUCLG1, which had 14 mutations, and 7 of the 14 mutations have not been reported.
  
  
  CONCLUSIONS
  NGS has a certain application value in the diagnosis of mitochondrial diseases, especially in Leigh syndrome atypical mitochondrial syndrome and rare mitochondrial disorders.
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Zhimei
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China; Email:13910150389@163.com.
authors.forename: Fang
authors.initials: F
authors.lastname: Fang
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Changhong
authors.initials: C
authors.lastname: Ding
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Weihua
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Jiuwei
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Xinying
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Hongmei
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Liying
authors.initials: L
authors.lastname: Liu
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Tongli
authors.initials: T
authors.lastname: Han
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Chunhong
authors.initials: C
authors.lastname: Chen
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Junlan
authors.initials: J
authors.lastname: Lyu
authors.affiliation: Department of Neurology, Beijing Children's Hospital, Capital Medical University, Beijing 100045, China.
authors.forename: Husheng
authors.initials: H
authors.lastname: Wu
mesh_terms: D002648:Child; D004272:DNA, Mitochondrial / Q000235:genetics*; D059014:High-Throughput Nucleotide Sequencing; D006720:Homozygote; D006801:Humans; D007888:Leigh Disease; D028361:Mitochondrial Diseases / Q000175:diagnosis*; D017237:Mitochondrial Encephalomyopathies; D009154:Mutation; D029242:Optic Atrophy, Hereditary, Leber; D010641:Phenotype; D017354:Point Mutation; D017422:Sequence Analysis, DNA
chemical_list: D004272:DNA, Mitochondrial