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Wang P, Zhang L, Chen S, Li R, Liu P, Li X, Luo H, Huo Y, Zhang Z, Cai Y, Liu X, Huang J, Zhou G, Sun Z, Ding S, Shi J, Zhou Z, Yuan R, Liu L, Wu S, Wang G. ANT2 functions as a translocon for mitochondrial cross-membrane translocation of RNAs. Cell Res 2024; 34:504-521. [PMID: 38811766 PMCID: PMC11217343 DOI: 10.1038/s41422-024-00978-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Accepted: 05/08/2024] [Indexed: 05/31/2024] Open
Abstract
Bidirectional transcription of mammalian mitochondrial DNA generates overlapping transcripts that are capable of forming double-stranded RNA (dsRNA) structures. Release of mitochondrial dsRNA into the cytosol activates the dsRNA-sensing immune signaling, which is a defense mechanism against microbial and viral attack and possibly cancer, but could cause autoimmune diseases when unchecked. A better understanding of the process is vital in therapeutic application of this defense mechanism and treatment of cognate human diseases. In addition to exporting dsRNAs, mitochondria also export and import a variety of non-coding RNAs. However, little is known about how these RNAs are transported across mitochondrial membranes. Here we provide direct evidence showing that adenine nucleotide translocase-2 (ANT2) functions as a mammalian RNA translocon in the mitochondrial inner membrane, independent of its ADP/ATP translocase activity. We also show that mitochondrial dsRNA efflux through ANT2 triggers innate immunity. Inhibiting this process alleviates inflammation in vivo, providing a potential therapeutic approach for treating autoimmune diseases.
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Affiliation(s)
- Pengcheng Wang
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Lixiao Zhang
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Siyi Chen
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Renjian Li
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Peipei Liu
- School of Life Sciences, Tsinghua University, Beijing, China
| | - Xiang Li
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Hongdi Luo
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Yujia Huo
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Zhirong Zhang
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Yiqi Cai
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Xu Liu
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Jinliang Huang
- School of Life Sciences, Tsinghua University, Beijing, China
| | - Guangkeng Zhou
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Zhe Sun
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Shanwei Ding
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Jiahao Shi
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Zizhuo Zhou
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Ruoxi Yuan
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Liang Liu
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China
| | - Sipeng Wu
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China.
| | - Geng Wang
- State Key Laboratory for Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Fujian, China.
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2
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Muneretto G, Plazzi F, Passamonti M. Mitochondrion-to-nucleus communication mediated by RNA export: a survey of potential mechanisms and players across eukaryotes. Biol Lett 2024; 20:20240147. [PMID: 38982851 DOI: 10.1098/rsbl.2024.0147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Accepted: 06/06/2024] [Indexed: 07/11/2024] Open
Abstract
The nucleus interacts with the other organelles to perform essential functions of the eukaryotic cell. Mitochondria have their own genome and communicate back to the nucleus in what is known as mitochondrial retrograde response. Information is transferred to the nucleus in many ways, leading to wide-ranging changes in nuclear gene expression and culminating with changes in metabolic, regulatory or stress-related pathways. RNAs are emerging molecules involved in this signalling. RNAs encode precise information and are involved in highly target-specific signalling, through a wide range of processes known as RNA interference. RNA-mediated mitochondrial retrograde response requires these molecules to exit the mitochondrion, a process that is still mostly unknown. We suggest that the proteins/complexes translocases of the inner membrane, polynucleotide phosphorylase, mitochondrial permeability transition pore, and the subunits of oxidative phosphorylation complexes may be responsible for RNA export.
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Affiliation(s)
- Giorgio Muneretto
- Department of Biological, Geological and Environmental Sciences, University of Bologna , Bologna, Italy
| | - Federico Plazzi
- Department of Biological, Geological and Environmental Sciences, University of Bologna , Bologna, Italy
| | - Marco Passamonti
- Department of Biological, Geological and Environmental Sciences, University of Bologna , Bologna, Italy
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3
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Shimpi GG, Bentlage B. Ancient endosymbiont-mediated transmission of a selfish gene provides a model for overcoming barriers to gene transfer into animal mitochondrial genomes. Bioessays 2023; 45:e2200190. [PMID: 36412071 DOI: 10.1002/bies.202200190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Revised: 11/09/2022] [Accepted: 11/10/2022] [Indexed: 11/23/2022]
Abstract
In contrast to bilaterian animals, non-bilaterian mitochondrial genomes contain atypical genes, often attributed to horizontal gene transfer (HGT) as an ad hoc explanation. Although prevalent in plants, HGT into animal mitochondrial genomes is rare, lacking suitable explanatory models for their occurrence. HGT of the mismatch DNA repair gene (mtMutS) from giant viruses to octocoral (soft corals and their kin) mitochondrial genomes provides a model for how barriers to HGT to animal mitochondria may be overcome. A review of the available literature suggests that this HGT was mediated by an alveolate endosymbiont infected with a lysogenic phycodnavirus that enabled insertion of the homing endonuclease containing mtMutS into octocoral mitochondrial genomes. We posit that homing endonuclease domains and similar selfish elements play a crucial role in such inter-domain gene transfers. Understanding the role of selfish genetic elements in HGT has the potential to aid development of tools for manipulating animal mitochondrial DNA.
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4
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Tarasenko TA, Koulintchenko MV. Heterogeneity of the Mitochondrial Population in Cells of Plants and Other Organisms. Mol Biol 2022. [DOI: 10.1134/s0026893322020157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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5
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Aubin E, El Baidouri M, Panaud O. Horizontal Gene Transfers in Plants. Life (Basel) 2021; 11:life11080857. [PMID: 34440601 PMCID: PMC8401529 DOI: 10.3390/life11080857] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 08/10/2021] [Accepted: 08/16/2021] [Indexed: 12/24/2022] Open
Abstract
In plants, as in all eukaryotes, the vertical transmission of genetic information through reproduction ensures the maintenance of the integrity of species. However, many reports over the past few years have clearly shown that horizontal gene transfers, referred to as HGTs (the interspecific transmission of genetic information across reproductive barriers) are very common in nature and concern all living organisms including plants. The advent of next-generation sequencing technologies (NGS) has opened new perspectives for the study of HGTs through comparative genomic approaches. In this review, we provide an up-to-date view of our current knowledge of HGTs in plants.
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Tarasenko TA, Klimenko ES, Tarasenko VI, Koulintchenko MV, Dietrich A, Weber-Lotfi F, Konstantinov YM. Plant mitochondria import DNA via alternative membrane complexes involving various VDAC isoforms. Mitochondrion 2021; 60:43-58. [PMID: 34303006 DOI: 10.1016/j.mito.2021.07.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 06/17/2021] [Accepted: 07/19/2021] [Indexed: 12/23/2022]
Abstract
Mitochondria possess transport mechanisms for import of RNA and DNA. Based on import into isolated Solanum tuberosum mitochondria in the presence of competitors, inhibitors or effectors, we show that DNA fragments of different size classes are taken up into plant organelles through distinct channels. Alternative channels can also be activated according to the amount of DNA substrate of a given size class. Analyses of Arabidopsis thaliana knockout lines pointed out a differential involvement of individual voltage-dependent anion channel (VDAC) isoforms in the formation of alternative channels. We propose several outer and inner membrane proteins as VDAC partners in these pathways.
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Affiliation(s)
- Tatiana A Tarasenko
- Siberian Institute of Plant Physiology and Biochemistry, SB RAS, 132 Lermontov St, Irkutsk 664033, Russia
| | - Ekaterina S Klimenko
- Siberian Institute of Plant Physiology and Biochemistry, SB RAS, 132 Lermontov St, Irkutsk 664033, Russia
| | - Vladislav I Tarasenko
- Siberian Institute of Plant Physiology and Biochemistry, SB RAS, 132 Lermontov St, Irkutsk 664033, Russia
| | - Milana V Koulintchenko
- Siberian Institute of Plant Physiology and Biochemistry, SB RAS, 132 Lermontov St, Irkutsk 664033, Russia.
| | - André Dietrich
- Institut de Biologie Moléculaire des Plantes, CNRS and Université de Strasbourg, 12 Rue du Général Zimmer, 67084 Strasbourg, France
| | - Frédérique Weber-Lotfi
- Institut de Biologie Moléculaire des Plantes, CNRS and Université de Strasbourg, 12 Rue du Général Zimmer, 67084 Strasbourg, France
| | - Yuri M Konstantinov
- Siberian Institute of Plant Physiology and Biochemistry, SB RAS, 132 Lermontov St, Irkutsk 664033, Russia; Irkutsk State University, 1 Karl Marx St, Irkutsk 664003, Russia
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7
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Hara T, Shibata Y, Amagai R, Okado-Matsumoto A. Use of in-gel peroxidase assay for cytochrome c to visualize mitochondrial complexes III and IV. Biol Open 2020; 9:bio.047936. [PMID: 31852667 PMCID: PMC6955206 DOI: 10.1242/bio.047936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The in-gel activity assay (IGA) is a powerful technique that uses enzymatic activity and compares intensities of detected bands in mitochondrial respiratory chain supercomplexes, and it is applicable to eukaryotic organisms. However, no IGA has been established for complex III because of the difficulty of access by ubiquinol, a substrate for complex III. Herein, we demonstrate that cytochrome c (Cyt c) showed peroxidase activity on IGA as a component of complexes III and IV. We used pre-incubation with sodium dodecyl sulfate (SDS) before IGA to loosen complexes in the gel after high-resolution clear native polyacrylamide gel electrophoresis (hrCN-PAGE), a refinement of blue native PAGE. The signals of IGA based on peroxidase activity were obtained using enhanced chemiluminescence solution. Then, the gel was directly used in western blotting or hrCN/SDS two-dimensional PAGE. Our findings indicate that IGA for Cyt c reflected the indirect activity of complexes III and IV. Summary: An improved in-gel activity assay visualized respiratory chain complexes III, IV and supercomplexes through cytochrome c. Pre-incubation of detergents enhanced the in-gel activity assay.
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Affiliation(s)
- Tsukasa Hara
- Department of Biology, Faculty of Science, Toho University, Miyama 2-2-1, Funabashi, Chiba 274-8510, Japan
| | - Yuma Shibata
- Department of Biology, Faculty of Science, Toho University, Miyama 2-2-1, Funabashi, Chiba 274-8510, Japan
| | - Ryosuke Amagai
- Department of Biology, Faculty of Science, Toho University, Miyama 2-2-1, Funabashi, Chiba 274-8510, Japan
| | - Ayako Okado-Matsumoto
- Department of Biology, Faculty of Science, Toho University, Miyama 2-2-1, Funabashi, Chiba 274-8510, Japan
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8
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Cheng Y, Liu P, Zheng Q, Gao G, Yuan J, Wang P, Huang J, Xie L, Lu X, Tong T, Chen J, Lu Z, Guan J, Wang G. Mitochondrial Trafficking and Processing of Telomerase RNA TERC. Cell Rep 2019; 24:2589-2595. [PMID: 30184494 DOI: 10.1016/j.celrep.2018.08.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 07/17/2018] [Accepted: 07/31/2018] [Indexed: 01/18/2023] Open
Abstract
Mitochondrial dysfunctions play major roles in many diseases. However, how mitochondrial stresses are relayed to downstream responses remains unclear. Here we show that the RNA component of mammalian telomerase TERC is imported into mitochondria, processed to a shorter form TERC-53, and then exported back to the cytosol. We found that the import is regulated by PNPASE, and the processing is controlled by mitochondrion-localized RNASET2. Cytosolic TERC-53 levels respond to changes in mitochondrial functions but have no direct effect on these functions. These findings uncover a mitochondrial RNA trafficking pathway and provide a potential mechanism for mitochondria to relay their functional states to other cellular compartments.
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Affiliation(s)
- Ying Cheng
- MOE Key Laboratory of Bioinformatics, Cell Biology and Development Center, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Peipei Liu
- MOE Key Laboratory of Bioinformatics, Cell Biology and Development Center, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Qian Zheng
- MOE Key Laboratory of Bioinformatics, Cell Biology and Development Center, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Ge Gao
- MOE Key Laboratory of Bioinformatics, Cell Biology and Development Center, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Jiapei Yuan
- MOE Key Laboratory of Bioinformatics, Cell Biology and Development Center, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Pengfeng Wang
- Peking University Research Center on Aging, Beijing 100191, China
| | - Jinliang Huang
- MOE Key Laboratory of Bioinformatics, Cell Biology and Development Center, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Leiming Xie
- MOE Key Laboratory of Bioinformatics, Cell Biology and Development Center, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Xinping Lu
- MOE Key Laboratory of Bioinformatics, Cell Biology and Development Center, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Tanjun Tong
- Peking University Research Center on Aging, Beijing 100191, China; Department of Biochemistry and Molecular Biology, Peking University Health Science Center, Beijing 100191, China
| | - Jun Chen
- Peking University Research Center on Aging, Beijing 100191, China; Department of Biochemistry and Molecular Biology, Peking University Health Science Center, Beijing 100191, China
| | - Zhi Lu
- MOE Key Laboratory of Bioinformatics, Cell Biology and Development Center, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Jisong Guan
- MOE Key Laboratory of Bioinformatics, Cell Biology and Development Center, School of Life Sciences, Tsinghua University, Beijing 100084, China
| | - Geng Wang
- MOE Key Laboratory of Bioinformatics, Cell Biology and Development Center, School of Life Sciences, Tsinghua University, Beijing 100084, China.
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Tarasenko TA, Tarasenko VI, Koulintchenko MV, Klimenko ES, Konstantinov YM. DNA Import into Plant Mitochondria: Complex Approach for in organello and in vivo Studies. BIOCHEMISTRY (MOSCOW) 2019; 84:817-828. [DOI: 10.1134/s0006297919070113] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Spiridonova LN, Valchuk OP, Red’kin YA. A New Case of Recombination between Nuclear and Mitochondrial Genomes in the Genus Calliope Gould, 1836 (Muscicapidae, Aves): The Hypothesis of Origin Calliope pectoralis Gould, 1837. RUSS J GENET+ 2019. [DOI: 10.1134/s1022795419010137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Wai A, Shen C, Carta A, Dansen A, Crous PW, Hausner G. Intron-encoded ribosomal proteins and N-acetyltransferases within the mitochondrial genomes of fungi: here today, gone tomorrow? Mitochondrial DNA A DNA Mapp Seq Anal 2019; 30:573-584. [DOI: 10.1080/24701394.2019.1580272] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Alvan Wai
- Department of Microbiology, University of Manitoba, Winnipeg, Canada
| | - Chen Shen
- Department of Microbiology, University of Manitoba, Winnipeg, Canada
| | - Andrell Carta
- Department of Microbiology, University of Manitoba, Winnipeg, Canada
| | - Alexandra Dansen
- Department of Microbiology, University of Manitoba, Winnipeg, Canada
| | - Pedro W. Crous
- The Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, Utrecht, The Netherlands
| | - Georg Hausner
- Department of Microbiology, University of Manitoba, Winnipeg, Canada
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Verechshagina NA, Konstantinov YM, Kamenski PA, Mazunin IO. Import of Proteins and Nucleic Acids into Mitochondria. BIOCHEMISTRY (MOSCOW) 2018; 83:643-661. [DOI: 10.1134/s0006297918060032] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Aravintha Siva M, Mahalakshmi R, Bhakta-Guha D, Guha G. Gene therapy for the mitochondrial genome: Purging mutations, pacifying ailments. Mitochondrion 2018; 46:195-208. [PMID: 29890303 DOI: 10.1016/j.mito.2018.06.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2018] [Revised: 05/24/2018] [Accepted: 06/07/2018] [Indexed: 12/21/2022]
Abstract
In the recent years, the reported cases of mitochondrial disorders have reached a colossal number. These disorders spawn a sundry of pathological conditions, which lead to pernicious symptoms and even fatality. Due to the unpredictable etiologies, mitochondrial diseases are putatively referred to as "mystondria" (mysterious diseases of mitochondria). Although present-day research has greatly improved our understanding of mitochondrial disorders, effective therapeutic interventions are still at the precursory stage. The conundrum becomes further complicated because these pathologies might occur due to either mitochondrial DNA (mtDNA) mutations or due to mutations in the nuclear DNA (nDNA), or both. While correcting nDNA mutations by using gene therapy (replacement of defective genes by delivering wild-type (WT) ones into the host cell, or silencing a dominant mutant allele that is pathogenic) has emerged as a promising strategy to address some mitochondrial diseases, the complications in correcting the defects of mtDNA in order to renovate mitochondrial functions have remained a steep challenge. In this review, we focus specifically on the selective gene therapy strategies that have demonstrated prospects in targeting the pathological mutations in the mitochondrial genome, thereby treating mitochondrial ailments.
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Affiliation(s)
- M Aravintha Siva
- Cellular Dyshomeostasis Laboratory (CDHL), School of Chemical and Bio Technology, SASTRA University, Thanjavur 613 401, Tamil Nadu, India
| | - R Mahalakshmi
- Cellular Dyshomeostasis Laboratory (CDHL), School of Chemical and Bio Technology, SASTRA University, Thanjavur 613 401, Tamil Nadu, India
| | - Dipita Bhakta-Guha
- Cellular Dyshomeostasis Laboratory (CDHL), School of Chemical and Bio Technology, SASTRA University, Thanjavur 613 401, Tamil Nadu, India.
| | - Gunjan Guha
- Cellular Dyshomeostasis Laboratory (CDHL), School of Chemical and Bio Technology, SASTRA University, Thanjavur 613 401, Tamil Nadu, India.
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Konstantinov YM, Dietrich A, Weber-Lotfi F, Ibrahim N, Klimenko ES, Tarasenko VI, Bolotova TA, Koulintchenko MV. DNA import into mitochondria. BIOCHEMISTRY (MOSCOW) 2016; 81:1044-1056. [DOI: 10.1134/s0006297916100035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Spiridonova LN, Valchuk OP, Red’kin YA, Kryukov AP. Nuclear mtDNA pseudogenes as a source of new variants of the mtDNA cytochrome b haplotypes: A case study of Siberian rubythroat Luscinia calliope (Muscicapidae, Aves). RUSS J GENET+ 2016. [DOI: 10.1134/s1022795416090131] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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16
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Samoilova EO, Krasheninnikov IA, Vinogradova EN, Kamenski PA, Levitskii SA. Binding of DNA with Abf2p increases efficiency of DNA uptake by isolated mitochondria. BIOCHEMISTRY (MOSCOW) 2016; 81:723-30. [DOI: 10.1134/s0006297916070087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Revisiting trends on mitochondrial mega-channels for the import of proteins and nucleic acids. J Bioenerg Biomembr 2016; 49:75-99. [DOI: 10.1007/s10863-016-9662-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Accepted: 04/25/2016] [Indexed: 12/14/2022]
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18
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Abstract
The intercellular transfer of DNA is a phenomenon that occurs in all domains of life and is a major driving force of evolution. Upon UV-light treatment, cells of the crenarchaeal genus Sulfolobus express Ups pili, which initiate cell aggregate formation. Within these aggregates, chromosomal DNA, which is used for the repair of DNA double-strand breaks, is exchanged. Because so far no clear homologs of bacterial DNA transporters have been identified among the genomes of Archaea, the mechanisms of archaeal DNA transport have remained a puzzling and underinvestigated topic. Here we identify saci_0568 and saci_0748, two genes from Sulfolobus acidocaldarius that are highly induced upon UV treatment, encoding a transmembrane protein and a membrane-bound VirB4/HerA homolog, respectively. DNA transfer assays showed that both proteins are essential for DNA transfer between Sulfolobus cells and act downstream of the Ups pili system. Our results moreover revealed that the system is involved in the import of DNA rather than the export. We therefore propose that both Saci_0568 and Saci_0748 are part of a previously unidentified DNA importer. Given the fact that we found this transporter system to be widely spread among the Crenarchaeota, we propose to name it the Crenarchaeal system for exchange of DNA (Ced). In this study we have for the first time to our knowledge described an archaeal DNA transporter.
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