A Comprehensive Genomic Analysis Reveals the Genetic Landscape of Mitochondrial Respiratory Chain Complex Deficiencies

Mitochondrial disorders have the highest incidence among congenital metabolic disorders characterized by biochemical respiratory chain complex deficiencies. It occurs at a rate of 1 in 5,000 births, and has phenotypic and genetic heterogeneity. Mutations in about 1,500 nuclear encoded mitochondrial...

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Published in:PLoS genetics 2016-01, Vol.12 (1), p.e1005679-e1005679
Main Authors: Kohda, Masakazu, Tokuzawa, Yoshimi, Kishita, Yoshihito, Nyuzuki, Hiromi, Moriyama, Yohsuke, Mizuno, Yosuke, Hirata, Tomoko, Yatsuka, Yukiko, Yamashita-Sugahara, Yzumi, Nakachi, Yutaka, Kato, Hidemasa, Okuda, Akihiko, Tamaru, Shunsuke, Borna, Nurun Nahar, Banshoya, Kengo, Aigaki, Toshiro, Sato-Miyata, Yukiko, Ohnuma, Kohei, Suzuki, Tsutomu, Nagao, Asuteka, Maehata, Hazuki, Matsuda, Fumihiko, Higasa, Koichiro, Nagasaki, Masao, Yasuda, Jun, Yamamoto, Masayuki, Fushimi, Takuya, Shimura, Masaru, Kaiho-Ichimoto, Keiko, Harashima, Hiroko, Yamazaki, Taro, Mori, Masato, Murayama, Kei, Ohtake, Akira, Okazaki, Yasushi
Format: Article
Language:English
Subjects:
Adolescent
Child
Child, Preschool
Chromosome Aberrations
Deoxyribonucleic acid
Disease
DNA
DNA, Mitochondrial - genetics
Exome - genetics
Female
Fibroblasts
Genetic Heterogeneity
Genomes
Grants
High-Throughput Nucleotide Sequencing
Humans
INDEL Mutation - genetics
Infant
Infant, Newborn
Innovations
Insects
Male
Medical research
Metabolic disorders
Mitochondria
Mitochondria - genetics
Mitochondria - pathology
Mitochondrial diseases
Mitochondrial Diseases - diagnosis
Mitochondrial Diseases - genetics
Mitochondrial Diseases - pathology
Mitochondrial DNA
Mutation
Physiological aspects
Polymorphism, Single Nucleotide - genetics
Science
Studies
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Summary:Mitochondrial disorders have the highest incidence among congenital metabolic disorders characterized by biochemical respiratory chain complex deficiencies. It occurs at a rate of 1 in 5,000 births, and has phenotypic and genetic heterogeneity. Mutations in about 1,500 nuclear encoded mitochondrial proteins may cause mitochondrial dysfunction of energy production and mitochondrial disorders. More than 250 genes that cause mitochondrial disorders have been reported to date. However exact genetic diagnosis for patients still remained largely unknown. To reveal this heterogeneity, we performed comprehensive genomic analyses for 142 patients with childhood-onset mitochondrial respiratory chain complex deficiencies. The approach includes whole mtDNA and exome analyses using high-throughput sequencing, and chromosomal aberration analyses using high-density oligonucleotide arrays. We identified 37 novel mutations in known mitochondrial disease genes and 3 mitochondria-related genes (MRPS23, QRSL1, and PNPLA4) as novel causative genes. We also identified 2 genes known to cause monogenic diseases (MECP2 and TNNI3) and 3 chromosomal aberrations (6q24.3-q25.1, 17p12, and 22q11.21) as causes in this cohort. Our approaches enhance the ability to identify pathogenic gene mutations in patients with biochemically defined mitochondrial respiratory chain complex deficiencies in clinical settings. They also underscore clinical and genetic heterogeneity and will improve patient care of this complex disorder.
ISSN:1553-7404
1553-7390
1553-7404
DOI:10.1371/journal.pgen.1005679