Publication: Profiling the mitochondrial proteome of leber's hereditary optic neuropathy (LHON) in Thailand: Down-regulation of bioenergetics and mitochondrial protein quality control pathways in fibroblasts with the 11778G>.a mutation
Issued Date
2014-09-01
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19326203
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2-s2.0-84933073935
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Mahidol University
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SCOPUS
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PLoS ONE. Vol.9, No.9 (2014)
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Aung Win Tun, Sakdithep Chaiyarit, Supannee Kaewsutthi, Wanphen Katanyoo, Wanicha Chuenkongkaew, Masayoshi Kuwano, Takeshi Tomonaga, Chayanon Peerapittayamongkol, Visith Thongboonkerd, Patcharee Lertrit Profiling the mitochondrial proteome of leber's hereditary optic neuropathy (LHON) in Thailand: Down-regulation of bioenergetics and mitochondrial protein quality control pathways in fibroblasts with the 11778G>.a mutation. PLoS ONE. Vol.9, No.9 (2014). doi:10.1371/journal.pone.0106779 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/32990
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Profiling the mitochondrial proteome of leber's hereditary optic neuropathy (LHON) in Thailand: Down-regulation of bioenergetics and mitochondrial protein quality control pathways in fibroblasts with the 11778G>.a mutation
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Abstract
© 2014 Tun et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Leber's Hereditary Optic Neuropathy (LHON) is one of the commonest mitochondrial diseases. It causes total blindness, and predominantly affects young males. For the disease to develop, it is necessary for an individual to carry one of the primary mtDNA mutations 11778G>A, 14484T>C or 3460G>A. However these mutations are not sufficient to cause disease, and they do not explain the characteristic features of LHON such as the higher prevalence in males, incomplete penetrance, and relatively later age of onset. In order to explore the roles of nuclear encoded mitochondrial proteins in development of LHON, we applied a proteomic approach to samples from affected and unaffected individuals from 3 pedigrees and from 5 unrelated controls. Two-dimensional electrophoresis followed by MS/MS analysis in the mitochondrial lysate identified 17 proteins which were differentially expressed between LHON cases and unrelated controls, and 24 proteins which were differentially expressed between unaffected relatives and unrelated controls. The proteomic data were successfully validated by western blot analysis of 3 selected proteins. All of the proteins identified in the study were mitochondrial proteins and most of them were down regulated in 11778G>A mutant fibroblasts. These proteins included: subunits of OXPHOS enzyme complexes, proteins involved in intermediary metabolic processes, nucleoid related proteins, chaperones, cristae remodelling proteins and an anti-oxidant enzyme. The protein profiles of both the affected and unaffected 11778G>A carriers shared many features which differed from those of unrelated control group, revealing similar proteomic responses to 11778G>A mutation in both affected and unaffected individuals. Differentially expressed proteins revealed two broad groups: a cluster of bioenergetic pathway proteins and a cluster involved in protein quality control system. Defects in these systems are likely to impede the function of retinal ganglion cells, and may lead to the development of LHON in synergy with the primary mtDNA mutation.