1
|
Ding Y, Zhu H. The mitochondrial ND1 3308T>C mutation may not be associated with left ventricular hypertrabeculation/noncompaction. Cardiology 2011; 119:183; author reply 184-5. [PMID: 21968326 DOI: 10.1159/000332575] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2011] [Accepted: 07/29/2011] [Indexed: 11/19/2022]
|
2
|
Bornstein B, Mas J, Patrono C, Fernández-Moreno M, González-Vioque E, Campos Y, Carrozzo R, Martín M, Hoyo P, Santorelli F, Arenas J, Garesse R. Comparative analysis of the pathogenic mechanisms associated with the G8363A and A8296G mutations in the mitochondrial tRNA(Lys) gene. Biochem J 2006; 387:773-8. [PMID: 15554876 PMCID: PMC1135008 DOI: 10.1042/bj20040949] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Two mutations (G8363A and A8296G) in the mtDNA (mitochondrial DNA) tRNA(Lys) gene have been associated with severe mitochondrial diseases in a number of reports. Their functional significance, however, remains unknown. We have already shown that homoplasmic cybrids harbouring the A8296G mutation display normal oxidative phosphorylation, although the possibility of a subtle change in mitochondrial respiratory capacity remains an open issue. We have now investigated the pathogenic mechanism of another mutation in the tRNA(Lys) gene (G8363A) by repopulating an mtDNA-less human osteosarcoma cell line with mitochondria harbouring either this genetic variant alone or an unusual combination of the two mutations (A8296G+G8363A). Cybrids homoplasmic for the single G8363A or the A8296G+G8363A mutations have defective respiratory-chain enzyme activities and low oxygen consumption, indicating a severe impairment of the oxidative phosphorylation system. Generation of G8363A cybrids within a wild-type or the A8296G mtDNA genetic backgrounds resulted in an important alteration in the conformation of the tRNA(Lys), not affecting tRNA steady-state levels. Moreover, mutant cybrids have an important decrease in the proportion of amino-acylated tRNA(Lys) and, consequently, mitochondrial protein synthesis is greatly decreased. Our results demonstrate that the pathogenicity of the G8363A mutation is due to a change in the conformation of the tRNA that severely impairs aminoacylation in the absence of changes in tRNA stability. The only effect detected in the A8296G mutation is a moderate decrease in the aminoacylation capacity, which does not affect mitochondrial protein biosynthesis.
Collapse
Affiliation(s)
- Belén Bornstein
- *Departamento de Bioquímica, Instituto de Investigaciones Biomédicas ‘Alberto Sols’, CSIC-UAM, Facultad de Medicina, Universidad Autónoma de Madrid, 28029 Madrid, Spain
- †Servicio de Bioquímica, Hospital Severo Ochoa, Leganés, Madrid, Spain
| | - José Antonio Mas
- *Departamento de Bioquímica, Instituto de Investigaciones Biomédicas ‘Alberto Sols’, CSIC-UAM, Facultad de Medicina, Universidad Autónoma de Madrid, 28029 Madrid, Spain
| | - Clarice Patrono
- *Departamento de Bioquímica, Instituto de Investigaciones Biomédicas ‘Alberto Sols’, CSIC-UAM, Facultad de Medicina, Universidad Autónoma de Madrid, 28029 Madrid, Spain
- ‡Unit of Molecular Medicine, Children's Hospital ‘Bambino Gesù’, Rome, Italy
| | - Miguel Angel Fernández-Moreno
- *Departamento de Bioquímica, Instituto de Investigaciones Biomédicas ‘Alberto Sols’, CSIC-UAM, Facultad de Medicina, Universidad Autónoma de Madrid, 28029 Madrid, Spain
| | - Emiliano González-Vioque
- *Departamento de Bioquímica, Instituto de Investigaciones Biomédicas ‘Alberto Sols’, CSIC-UAM, Facultad de Medicina, Universidad Autónoma de Madrid, 28029 Madrid, Spain
| | - Yolanda Campos
- §Centro de Investigación, Hospital 12 de Octubre, Madrid, Spain
| | - Rosalba Carrozzo
- ‡Unit of Molecular Medicine, Children's Hospital ‘Bambino Gesù’, Rome, Italy
| | | | - Pilar del Hoyo
- §Centro de Investigación, Hospital 12 de Octubre, Madrid, Spain
| | | | - Joaquín Arenas
- §Centro de Investigación, Hospital 12 de Octubre, Madrid, Spain
| | - Rafael Garesse
- *Departamento de Bioquímica, Instituto de Investigaciones Biomédicas ‘Alberto Sols’, CSIC-UAM, Facultad de Medicina, Universidad Autónoma de Madrid, 28029 Madrid, Spain
- To whom correspondence should be addressed (email )
| |
Collapse
|
3
|
Kong QP, Yao YG, Sun C, Zhu CL, Zhong L, Wang CY, Cai WW, Xu XM, Xu AL, Zhang YP. Phylogeographic analysis of mitochondrial DNA haplogroup F2 in China reveals T12338C in the initiation codon of the ND5 gene not to be pathogenic. J Hum Genet 2004; 49:414-423. [PMID: 15278763 DOI: 10.1007/s10038-004-0170-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2004] [Accepted: 05/06/2004] [Indexed: 11/29/2022]
Abstract
In this report, we studied on a homoplasmic T12338C change in mitochondrial DNA (mtDNA), which substituted methionine in the translational initiation codon of the NADH dehydrogenase subunit 5 gene ( ND5) with threonine. This nucleotide change was originally identified in two mtDNAs belonging to haplogroup F2 by our previous complete sequencing of 48 mtDNAs. Since then, a total of 76 F2 mtDNAs have been identified by the variations occurring in the hypervariable segments and coding regions among more than 3,000 individuals across China. As the T12338C change was detected in 32 samples representing various sub-clades of the F2 haplogroup while not in 14 non-F2 controls, we believe that the T12338C change is specific to the F2 haplogroup. As F2 and its sub-clades were widely distributed in normal individuals of various Chinese populations, we conclude that T12338C is not pathogenic. In addition, based on the average distribution frequency, haplotype diversity and nucleotide diversity of haplogroup F2 in the populations across China, the T12338C nucleotide substitution seems to have been occurred in north China about 42,000 years ago. Our results provided a good paradigm for distinguishing a polymorphic change from a pathogenic mutation based on mtDNA phylogeny.
Collapse
Affiliation(s)
- Qing-Peng Kong
- Laboratory of Cellular and Molecular Evolution, and Molecular Biology of Domestic Animals, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China
- Laboratory for Conservation and Utilization of Bio-resource, Yunnan University, Kunming, 650091, China
- Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China
| | - Yong-Gang Yao
- Laboratory of Cellular and Molecular Evolution, and Molecular Biology of Domestic Animals, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China
- The Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Chang Sun
- Laboratory of Cellular and Molecular Evolution, and Molecular Biology of Domestic Animals, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China
- Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China
| | - Chun-Ling Zhu
- Laboratory of Cellular and Molecular Evolution, and Molecular Biology of Domestic Animals, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China
| | - Li Zhong
- Laboratory for Conservation and Utilization of Bio-resource, Yunnan University, Kunming, 650091, China
| | - Cheng-Ye Wang
- Laboratory of Cellular and Molecular Evolution, and Molecular Biology of Domestic Animals, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China
- Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China
| | - Wang-Wei Cai
- Department of Biochemistry, Hainan Medical College, Haikou, 571101, China
| | - Xiang-Min Xu
- Department of Medical Genetics, First Military Medical University, Guangzhou, 510515, China
| | - An-Long Xu
- College of Life Sciences, Zhongshan University, Guangzhou, 510275, China
| | - Ya-Ping Zhang
- Laboratory of Cellular and Molecular Evolution, and Molecular Biology of Domestic Animals, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.
- Laboratory for Conservation and Utilization of Bio-resource, Yunnan University, Kunming, 650091, China.
| |
Collapse
|
4
|
Dubot A, Godinot C, Dumur V, Sablonnière B, Stojkovic T, Cuisset JM, Vojtiskova A, Pecina P, Jesina P, Houstek J. GUG is an efficient initiation codon to translate the human mitochondrial ATP6 gene. Biochem Biophys Res Commun 2004; 313:687-93. [PMID: 14697245 DOI: 10.1016/j.bbrc.2003.12.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A maternally inherited and practically homoplasmic mitochondrial (mtDNA) mutation, 8527A>G, changing the initiation codon AUG into GUG, normally coding for a valine, was observed in the ATP6 gene encoding the ATPase subunit a. No alternate Met codon could replace the normal translational initiator. The patient harboring this mutation exhibited clinical symptoms suggesting a mitochondrial disease but his mother who carried the same mtDNA mutation was healthy. The mutation was absent from 100 controls and occurred once amongst 44 patients suspected of Leber Hereditary Optic Neuropathy (LHON) but devoid of typical LHON mutations. In patient fibroblasts, no effect of 8527A>G mutation could be demonstrated on the biosynthesis of mtDNA-encoded proteins, on size and the content of ATPase subunit a, on ATP hydrolysis and on mitochondrial membrane potential. In addition, ATP synthesis was barely decreased. Therefore, GUG is a functional initiation codon for the human ATP6 gene.
Collapse
Affiliation(s)
- A Dubot
- Centre National de la Recherche Scientifique, Université Claude Bernard de Lyon I, 69622 Villeurbanne France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Abstract
Variation in hypervariable region I (HVR-I) and mutations in coding areas of mtDNA were studied in 257 patients of sudden infant death caused by infections, sudden infant death syndrome (SIDS), and borderline SIDS and in a control group of 102 living infants. Nine different point mutations were detected in the coding areas investigated: T3290C, T3308C, T3308G (three patients), A9299G (two patients), G9300A (two patients), T10034C (nine patients), A10042T, C10043T, and A10044G. An association was found between a high number of HVR-I substitutions and potentially pathogenic mtDNA point mutations in coding areas (P = 0.024, odds ratio = 1.3). The mean number of substitutions in HVR-I was 3.28 in the infectious death group, 2.63 in the borderline SIDS group, 2.58 in the SIDS group, and 2.02 in the control group (P = 0.005). In coding areas, 11.1% of the infectious death patients had a mutation, and the same was true for 9.8% of the borderline SIDS patients, 5.6% of the SIDS patients, and 2.9% of the control subjects (P = 0.21). The results indicate that increased levels of HVR-I substitutions may be an indicator of mtDNA instability. Furthermore, mtDNA mutations may play a role in some patients with sudden unexpected infant death that was unexplained or thought to be caused by infection.
Collapse
Affiliation(s)
- Siri H Opdal
- Institute of Forensic Medicine, University of Oslo, Oslo, Norway
| | | | | | | | | |
Collapse
|
6
|
Garesse R, Vallejo CG. Animal mitochondrial biogenesis and function: a regulatory cross-talk between two genomes. Gene 2001; 263:1-16. [PMID: 11223238 DOI: 10.1016/s0378-1119(00)00582-5] [Citation(s) in RCA: 223] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Mitochondria play a pivotal role in cell physiology, producing the cellular energy and other essential metabolites as well as controlling apoptosis by integrating numerous death signals. The biogenesis of the oxidative phosphorylation system (OXPHOS) depends on the coordinated expression of two genomes, nuclear and mitochondrial. As a consequence, the control of mitochondrial biogenesis and function depends on extremely complex processes that require a variety of well orchestrated regulatory mechanisms. It is now clear that in order to provide cells with the correct number of structural and functional differentiated mitochondria, a variety of intracellular and extracellular signals including hormones and environmental stimuli need to be integrated. During the last few years a considerable effort has been devoted to study the factors that regulate mtDNA replication and transcription as well as the expression of nuclear-encoded mitochondrial genes in physiological and pathological conditions. Although still in their infancy, these studies are starting to provide the molecular basis that will allow to understand the mechanisms involved in the nucleo-mitochondrial communication, a cross-talk essential for cell life and death.
Collapse
Affiliation(s)
- R Garesse
- Instituto de Investigaciones Biomédicas Alberto Sols CSIC-UAM, Departamento de Bioquímica, Facultad de Medicina, Universidad Autónoma de Madrid, Arturo Duperier, 4, 28029 Madrid, Spain.
| | | |
Collapse
|