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Ji D, Zhang N, Zou W, Zhang Z, Marley JL, Liu Z, Liang C, Shen L, Liu Y, Liang D, Su T, Du Y, Cao Y. Modeling-based prediction tools for preimplantation genetic testing of mitochondrial DNA diseases: estimating symptomatic thresholds, risk, and chance of success. J Assist Reprod Genet 2023; 40:2185-2196. [PMID: 37439868 PMCID: PMC10440331 DOI: 10.1007/s10815-023-02880-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 06/30/2023] [Indexed: 07/14/2023] Open
Abstract
PURPOSE Preimplantation genetic testing (PGT) has become a reliable tool for preventing the germline transmission of mitochondrial DNA (mtDNA) variants. However, procedures are not standardized across mtDNA variants. In this study, we aim to estimate symptomatic thresholds, risk, and chance of success for PGT for mtDNA pathogenic variant carriers. METHODS We performed a systematic analysis of heteroplasmy data including 455 individuals from 187 familial pedigrees with the common m.3243A>G, m.8344A>G, or m.8993T>G pathogenic variants. We applied binary logistic regression for estimating symptomatic thresholds of heteroplasmy, simplified Sewell-Wright formula and Kimura equations for predicting the risk of disease transmission, and binomial distribution for predicting minimum oocyte numbers. RESULTS We estimated the symptomatic thresholds of m.8993T>G and m.8344A>G as 29.86% and 16.15%, respectively. We could not determine a threshold for m.3243A>G. We established models for mothers harboring common and rare mtDNA pathogenic variants to predict the risk of disease transmission and the number of oocytes required to produce an embryo with sufficiently low variant load. In addition, we provide a table allowing the prediction of transmission risk and the minimum required oocytes for PGT patients with different variant levels. CONCLUSION We have established models that can determine the symptomatic thresholds of common mtDNA pathogenic variants. We also constructed universal models applicable to nearly all mtDNA pathogenic variants which can predict risk and minimum numbers for PGT patients. These models have advanced our understanding of mtDNA disease pathogenesis and will enable more effective prevention of disease transmission using PGT.
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Affiliation(s)
- Dongmei Ji
- Department of Obstetrics and Gynecology, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
- NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract (Anhui Medical University), Hefei, Anhui, China
- Key Laboratory of Population Health Across Life Cycle (Anhui Medical University), Ministry of Education of the People's Republic of China, Hefei, Anhui, China
| | - Ning Zhang
- Department of Obstetrics and Gynecology, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
- School of Basic Medical Sciences, Anhui Medical University, Hefei, Anhui, China
- First School of Clinical Medicine, Anhui Medical University, Hefei, Anhui, China
| | - Weiwei Zou
- Department of Obstetrics and Gynecology, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
- NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract (Anhui Medical University), Hefei, Anhui, China
- Key Laboratory of Population Health Across Life Cycle (Anhui Medical University), Ministry of Education of the People's Republic of China, Hefei, Anhui, China
| | - Zhikang Zhang
- Department of Obstetrics and Gynecology, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
- NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract (Anhui Medical University), Hefei, Anhui, China
- First School of Clinical Medicine, Anhui Medical University, Hefei, Anhui, China
| | - Jordan Lee Marley
- Wellcome Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - Zhuoli Liu
- Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, Anhui, China
| | - Chunmei Liang
- Department of Obstetrics and Gynecology, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
- NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract (Anhui Medical University), Hefei, Anhui, China
- Key Laboratory of Population Health Across Life Cycle (Anhui Medical University), Ministry of Education of the People's Republic of China, Hefei, Anhui, China
| | - Lingchao Shen
- Department of Obstetrics and Gynecology, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
- NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract (Anhui Medical University), Hefei, Anhui, China
- First School of Clinical Medicine, Anhui Medical University, Hefei, Anhui, China
| | - Yajing Liu
- Department of Obstetrics and Gynecology, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
- NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract (Anhui Medical University), Hefei, Anhui, China
- Key Laboratory of Population Health Across Life Cycle (Anhui Medical University), Ministry of Education of the People's Republic of China, Hefei, Anhui, China
| | - Dan Liang
- Department of Obstetrics and Gynecology, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
- NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract (Anhui Medical University), Hefei, Anhui, China
- Key Laboratory of Population Health Across Life Cycle (Anhui Medical University), Ministry of Education of the People's Republic of China, Hefei, Anhui, China
| | - Tianhong Su
- Division of Gastroenterology and Hepatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
- Baoshan Branch, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
| | - Yinan Du
- School of Basic Medical Sciences, Anhui Medical University, Hefei, Anhui, China.
| | - Yunxia Cao
- Department of Obstetrics and Gynecology, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China.
- NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract (Anhui Medical University), Hefei, Anhui, China.
- Key Laboratory of Population Health Across Life Cycle (Anhui Medical University), Ministry of Education of the People's Republic of China, Hefei, Anhui, China.
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Human germline nuclear transfer to overcome mitochondrial disease and failed fertilization after ICSI. J Assist Reprod Genet 2022; 39:609-618. [PMID: 35064435 PMCID: PMC8995215 DOI: 10.1007/s10815-022-02401-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 01/15/2022] [Indexed: 10/19/2022] Open
Abstract
PURPOSE Providing additional insights on the efficacy of human nuclear transfer (NT). Here, and earlier, NT has been applied to minimize transmission risk of mitochondrial DNA (mtDNA) diseases. NT has also been proposed for treating infertility, but it is still unclear which infertility indications would benefit. In this work, we therefore additionally assess the applicability of NT to overcome failed fertilization. METHODS Patient 1 carries a homoplasmic mtDNA mutation (m.11778G > A). Seventeen metaphase II (MII) oocytes underwent pre-implantation genetic testing (PGT), while five MII oocytes were used for spindle transfer (ST), and one in vitro matured (IVM) metaphase I oocyte underwent early pronuclear transfer (ePNT). Patients 2-3 experienced multiple failed intracytoplasmic sperm injection (ICSI) and ICSI-assisted oocyte activation (AOA) cycles. For these patients, the obtained MII oocytes underwent an additional ICSI-AOA cycle, while the IVM oocytes were subjected to ST. RESULTS For patient 1, PGT-M confirmed mutation loads close to 100%. All ST-reconstructed oocytes fertilized and cleaved, of which one progressed to the blastocyst stage. The reconstructed ePNT-zygote reached the morula stage. These samples showed an average mtDNA carry-over rate of 2.9% ± 0.8%, confirming the feasibility of NT to reduce mtDNA transmission. For patient 2-3 displaying fertilization failure, ST resulted in, respectively, 4/5 and 6/6 fertilized oocytes, providing evidence, for the first time, that NT can enable successful fertilization in this patient population. CONCLUSION Our study showcases the repertoire of disorders for which NT can be beneficial, to overcome either mitochondrial disease transmission or failed fertilization after ICSI-AOA.
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Cowell W, Brunst K, Colicino E, Zhang L, Zhang X, Bloomquist TR, Baccarelli AA, Wright RJ. Placental mitochondrial DNA mutational load and perinatal outcomes: Findings from a multi-ethnic pregnancy cohort. Mitochondrion 2021; 59:267-275. [PMID: 34102325 DOI: 10.1016/j.mito.2021.06.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 05/07/2021] [Accepted: 06/03/2021] [Indexed: 10/21/2022]
Abstract
Mitochondria fuel placental activity, with mitochondrial dysfunction implicated in several perinatal complications. We investigated placental mtDNA mutational load using NextGen sequencing in relation to birthweight and gestational length among 358 mother-newborn pairs. We found that higher heteroplasmy, especially in the hypervariable displacement loop region, was associated with shorter gestational length. Results were similar among male and female pregnancies, but stronger in magnitude among females. With regard to growth, we observed that higher mutational load was associated with lower birthweight-for-gestational age (BWGA) among females, but higher BWGA among males. These findings support potential sex-differential fetal biological strategies for coping with increased heteroplasmies.
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Affiliation(s)
- Whitney Cowell
- Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
| | - Kelly Brunst
- Department of Environmental and Public Health Sciences, University of Cincinnati, College of Medicine, Cincinnati, OH 45267, USA
| | - Elena Colicino
- Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Li Zhang
- Department of Environmental and Public Health Sciences, University of Cincinnati, College of Medicine, Cincinnati, OH 45267, USA
| | - Xiang Zhang
- Department of Environmental and Public Health Sciences, University of Cincinnati, College of Medicine, Cincinnati, OH 45267, USA
| | - Tessa R Bloomquist
- Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, New York, NY 10032, USA
| | - Andrea A Baccarelli
- Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, New York, NY 10032, USA
| | - Rosalind J Wright
- Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Kravis Children's Hospital, Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Institute for Exposomic Research, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
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Abstract
Maternally mitochondrial dysfunction includes a heterogeneous group of genetic disorders which leads to the impairment of the final common pathway of energy metabolism. Coronary heart disease and coronary venous disease are two important clinical manifestations of mitochondrial dysfunction due to abnormality in the setting of underlying pathways. Mitochondrial dysfunction can lead to cardiomyopathy, which is involved in the onset of acute cardiac and pulmonary failure. Mitochondrial diseases present other cardiac manifestations such as left ventricular noncompaction and cardiac conduction disease. Different clinical findings from mitochondrial dysfunction originate from different mtDNA mutations, and this variety of clinical symptoms poses a diagnostic challenge for cardiologists. Heart transplantation may be a good treatment, but it is not always possible, and other complications of the disease, such as mitochondrial encephalopathy, lactic acidosis, and stroke-like syndrome, should be considered. To diagnose and treat most mitochondrial disorders, careful cardiac, neurological, and molecular studies are needed. In this study, we looked at molecular genetics of MIDs and cardiac manifestations in patients with mitochondrial dysfunction.
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Expanding the Phenotype of the Founder South Asian Mutation in the Nuclear Encoding Mitochondrial RMND1 Gene. Indian J Pediatr 2018; 85:87-92. [PMID: 29071585 DOI: 10.1007/s12098-017-2515-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Accepted: 09/22/2017] [Indexed: 01/25/2023]
Abstract
BACKGROUND Mitochondrial disorders have a wide variability in the phenotype. A 10-mo-old girl presented with a severe phenotype of multisystem involvement due to an uncommon mitochondrial disease. Mutations in the RMND1 gene of nuclear DNA were identified on next generation sequencing. This mutation results in combined oxidative phosphorylation deficiency -11 (OMIM #614922) of the respiratory chain complex. So far in South Asia, patients of this disorder have been reported only from Pakistan and Bangladesh. RESULTS In addition to the features reported in other patients of South Asia with the same mutation at c.1349G>C, index patient from India had hyperaldosteronism, long QT interval but no deafness. CONCLUSIONS Thus, to conclude, this report emphasizes the diagnostic value of FGF21 assay in this disorder. It extends the phenotype associated with the founder mutation in RMND1 gene in patients from South Asia.
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Baris TZ, Wagner DN, Dayan DI, Du X, Blier PU, Pichaud N, Oleksiak MF, Crawford DL. Evolved genetic and phenotypic differences due to mitochondrial-nuclear interactions. PLoS Genet 2017; 13:e1006517. [PMID: 28362806 PMCID: PMC5375140 DOI: 10.1371/journal.pgen.1006517] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 12/01/2016] [Indexed: 02/05/2023] Open
Abstract
The oxidative phosphorylation (OxPhos) pathway is responsible for most aerobic ATP production and is the only pathway with both nuclear and mitochondrial encoded proteins. The importance of the interactions between these two genomes has recently received more attention because of their potential evolutionary effects and how they may affect human health and disease. In many different organisms, healthy nuclear and mitochondrial genome hybrids between species or among distant populations within a species affect fitness and OxPhos functions. However, what is less understood is whether these interactions impact individuals within a single natural population. The significance of this impact depends on the strength of selection for mito-nuclear interactions. We examined whether mito-nuclear interactions alter allele frequencies for ~11,000 nuclear SNPs within a single, natural Fundulus heteroclitus population containing two divergent mitochondrial haplotypes (mt-haplotypes). Between the two mt-haplotypes, there are significant nuclear allele frequency differences for 349 SNPs with a p-value of 1% (236 with 10% FDR). Unlike the rest of the genome, these 349 outlier SNPs form two groups associated with each mt-haplotype, with a minority of individuals having mixed ancestry. We use this mixed ancestry in combination with mt-haplotype as a polygenic factor to explain a significant fraction of the individual OxPhos variation. These data suggest that mito-nuclear interactions affect cardiac OxPhos function. The 349 outlier SNPs occur in genes involved in regulating metabolic processes but are not directly associated with the 79 nuclear OxPhos proteins. Therefore, we postulate that the evolution of mito-nuclear interactions affects OxPhos function by acting upstream of OxPhos.
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Affiliation(s)
- Tara Z. Baris
- Marine Biology and Ecology, Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Rickenbacker Causeway, Miami, FL, United States of America
- * E-mail:
| | - Dominique N. Wagner
- Marine Biology and Ecology, Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Rickenbacker Causeway, Miami, FL, United States of America
| | - David I. Dayan
- Marine Biology and Ecology, Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Rickenbacker Causeway, Miami, FL, United States of America
| | - Xiao Du
- Marine Biology and Ecology, Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Rickenbacker Causeway, Miami, FL, United States of America
| | - Pierre U. Blier
- Dept de Biologie, Université du Québec à Rimouski, 300 Allée des Ursulines, Rimouski, Quebec, Canada
| | - Nicolas Pichaud
- Dept de Biologie, Université du Québec à Rimouski, 300 Allée des Ursulines, Rimouski, Quebec, Canada
| | - Marjorie F. Oleksiak
- Marine Biology and Ecology, Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Rickenbacker Causeway, Miami, FL, United States of America
| | - Douglas L. Crawford
- Marine Biology and Ecology, Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Rickenbacker Causeway, Miami, FL, United States of America
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Reznichenko AS, Huyser C, Pepper MS. Mitochondrial transfer: Implications for assisted reproductive technologies. Appl Transl Genom 2016; 11:40-47. [PMID: 28018848 PMCID: PMC5167373 DOI: 10.1016/j.atg.2016.10.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 10/05/2016] [Accepted: 10/14/2016] [Indexed: 01/24/2023]
Abstract
The use of mitochondrial transfer as a clinic procedure is drawing closer to reality. Here we provide a detailed overview of mitochondrial transfer techniques – both established and recent – including pronuclear, spindle, ooplasmic and blastomere transfer. Reasons as to why some techniques are more suitable for the prevention of mitochondrial DNA disease than others, as well as the advantages and disadvantages of each methodology, are discussed. The possible clinical introduction of these techniques has raised concerns about the adverse effects they may have on resultant embryos and offspring. Success rates of each technique, embryo viability and developmental consequences post mitochondrial transfer are addressed through analysis of evidence obtained from both animal and human studies. Counterarguments against potential mitochondrial-nuclear genome incompatibility are also provided. Additional clinical applications of mitochondrial transfer techniques are discussed. These include the rescue or enhancement of fertility in women of advanced maternal age or those suffering from diabetes. An alternative to using mitochondrial DNA transfer for germ line therapies is the therapeutic use of somatic cell nuclear transfer for the generation of personalised stem cells. Although ethically challenging, this method could offer patients already suffering from mitochondrial DNA diseases a novel treatment option.
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Affiliation(s)
- A S Reznichenko
- IVF Laboratory, Medfem Fertility Clinic, Bryanston, South Africa
| | - C Huyser
- Department of Obstetrics and Gynaecology, University of Pretoria, Steve Biko Academic Hospital, Pretoria, South Africa
| | - M S Pepper
- Department of Immunology and Institute for Cellular and Molecular Medicine, and SAMRC Extramural Unit doe Stem Cell Research and Therapy, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
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Darbandi S, Darbandi M, Khorshid HRK, Sadeghi MR, Al-Hasani S, Agarwal A, Shirazi A, Heidari M, Akhondi MM. Experimental strategies towards increasing intracellular mitochondrial activity in oocytes: A systematic review. Mitochondrion 2016; 30:8-17. [PMID: 27234976 DOI: 10.1016/j.mito.2016.05.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 04/04/2016] [Accepted: 05/20/2016] [Indexed: 12/19/2022]
Abstract
PURPOSE The mitochondrial complement is critical in sustaining the earliest stages of life. To improve the Assisted Reproductive Technology (ART), current methods of interest were evaluated for increasing the activity and copy number of mitochondria in the oocyte cell. METHODS This covered the researches from 1966 to September 2015. RESULTS The results provided ten methods that can be studied individually or simultaneously. CONCLUSION Though the use of these techniques generated great concern about heteroplasmy observation in humans, it seems that with study on these suggested methods there is real hope for effective treatments of old oocyte or oocytes containing mitochondrial problems in the near future.
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Affiliation(s)
- Sara Darbandi
- Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
| | - Mahsa Darbandi
- Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
| | | | - Mohammad Reza Sadeghi
- Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
| | - Safaa Al-Hasani
- Reproductive Medicine Unit, University of Schleswig-Holstein, Luebeck, Germany.
| | - Ashok Agarwal
- Center for Reproductive Medicine, Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH, USA.
| | - Abolfazl Shirazi
- Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
| | - Mahnaz Heidari
- Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran. M.@avicenna.ar.ir
| | - Mohammad Mehdi Akhondi
- Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR, Tehran, Iran.
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Smeets HJ, Sallevelt SC, Dreesen JC, de Die-Smulders CE, de Coo IF. Preventing the transmission of mitochondrial DNA disorders using prenatal or preimplantation genetic diagnosis. Ann N Y Acad Sci 2015; 1350:29-36. [DOI: 10.1111/nyas.12866] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Hubert J.M. Smeets
- Department of Clinical Genetics; Maastricht University Medical Centre; Maastricht the Netherlands
- CARIM School for Cardiovascular Diseases; Maastricht University; Maastricht the Netherlands
- GROW School for Oncology and Developmental Biology; Maastricht University; Maastricht the Netherlands
| | - Suzanne C.E.H. Sallevelt
- Department of Clinical Genetics; Maastricht University Medical Centre; Maastricht the Netherlands
- CARIM School for Cardiovascular Diseases; Maastricht University; Maastricht the Netherlands
| | - Jos C.F.M. Dreesen
- Department of Clinical Genetics; Maastricht University Medical Centre; Maastricht the Netherlands
| | - Christine E.M. de Die-Smulders
- Department of Clinical Genetics; Maastricht University Medical Centre; Maastricht the Netherlands
- GROW School for Oncology and Developmental Biology; Maastricht University; Maastricht the Netherlands
| | - Irenaeus F.M. de Coo
- Department of Neurology; Erasmus MC-Sophia Children's Hospital; Rotterdam the Netherlands
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Abstract
Zusammenfassung
Für Paare mit hohem Risiko der Nachkommen für eine monogen-erbliche oder chromosomal-bedingte Erkrankung kann die Präimplantationsdiagnostik (PID) heute eine Option einer verantwortlichen Familienplanung sein. Voraussetzung für eine PID ist die Befruchtung von Eizellen im Reagenzglas (In-vitro-Fertilisation, IVF). Die Behandlungsergebnisse entsprechen weitgehend denen einer normalen Kinderwunschbehandlung mit intrazytoplasmatischer Spermieninjektion (ICSI) ohne PID. Die Grenzen und Chancen, aber auch der hohe Aufwand, sind frühzeitig und ergebnisoffen in einer interdisziplinären Beratung zu thematisieren, um dem Paar eine informierte Entscheidung und Abwägung der PID gegenüber anderen Alternativen im Rahmen der Familienplanung zu ermöglichen.
In diesem Beitrag werden der aktuelle internationale Kenntnisstand zur PID, einschließlich ihrer verschiedenen Anwendungsbereiche, sowie mögliche zukünftige Entwicklungen vorgestellt. Breiten Raum nimmt der rechtliche Rahmen für die eng begrenzte Durchführung einer PID in Deutschland ein, der durch den Deutschen Bundestag mit der Verabschiedung des Gesetzes zur Regelung der Präimplantationsdiagnostik (Präimplantationsdiagnostikgesetz, PräimpG) 2011 und der nachfolgenden Rechtsverordnung 2012 definiert wurde. Abschließend wird der derzeitige Stand der Umsetzung in Deutschland skizziert und eine nationale Koordination und Vernetzung der PID-Zentren angeregt, um zeitnah unter optimaler Nutzung der Ressourcen und Erfahrungen für ein möglichst breites Spektrum an seltenen Erkrankungen eine qualitätsgesicherte PID in Deutschland anbieten zu können.
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Morén C, Hernández S, Guitart-Mampel M, Garrabou G. Mitochondrial toxicity in human pregnancy: an update on clinical and experimental approaches in the last 10 years. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2014; 11:9897-918. [PMID: 25247430 PMCID: PMC4199057 DOI: 10.3390/ijerph110909897] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 09/05/2014] [Accepted: 09/17/2014] [Indexed: 01/19/2023]
Abstract
Mitochondrial toxicity can be one of the most dreadful consequences of exposure to a wide range of external agents including pathogens, therapeutic agents, abuse drugs, toxic gases and other harmful chemical substances. However, little is known about the effects of mitochondrial toxicity on pregnant women exposed to these agents that may exert transplacental activity and condition fetal remodeling. It has been hypothesized that mitochondrial toxicity may be involved in some adverse obstetric outcomes. In the present study, we investigated the association between exposure to mitochondrial toxic agents and pathologic conditions ranging from fertility defects, detrimental fetal development and impaired newborn health due to intra-uterine exposure. We have reviewed data from studies in human subjects to propose mechanisms of mitochondrial toxicity that could be associated with the symptoms present in both exposed pregnant and fetal patients. Since some therapeutic interventions or accidental exposure cannot be avoided, further research is needed to gain insight into the molecular pathways leading to mitochondrial toxicity during pregnancy. The ultimate objective of these studies should be to reduce the mitochondrial toxicity of these agents and establish biomarkers for gestational monitoring of harmful effects.
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Affiliation(s)
- Constanza Morén
- Muscle Research and Mitochondrial Function Laboratory, Cellex-IDIBAPS-Faculty of Medicine-University of Barcelona, Internal Medicine Service-Hospital Clínic of Barcelona, Barcelona 08036, Spain.
| | - Sandra Hernández
- Centro de Investigación Biomédica en Red (CIBER) de Enfermedades Raras, CIBERER, Valencia 46010, Spain.
| | - Mariona Guitart-Mampel
- Muscle Research and Mitochondrial Function Laboratory, Cellex-IDIBAPS-Faculty of Medicine-University of Barcelona, Internal Medicine Service-Hospital Clínic of Barcelona, Barcelona 08036, Spain.
| | - Glòria Garrabou
- Muscle Research and Mitochondrial Function Laboratory, Cellex-IDIBAPS-Faculty of Medicine-University of Barcelona, Internal Medicine Service-Hospital Clínic of Barcelona, Barcelona 08036, Spain.
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Smeets HJM. Preventing the transmission of mitochondrial DNA disorders: selecting the good guys or kicking out the bad guys. Reprod Biomed Online 2013; 27:599-610. [PMID: 24135157 DOI: 10.1016/j.rbmo.2013.08.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2013] [Revised: 07/26/2013] [Accepted: 08/01/2013] [Indexed: 01/30/2023]
Abstract
Mitochondrial disorders represent the most common group of inborn errors of metabolism. Clinical manifestations can be extremely variable, ranging from single affected tissues to multisystemic syndromes. Maternally inherited mitochondrial DNA (mtDNA) mutations are a frequent cause, affecting about one in 5000 individuals. The expression of mtDNA mutations differs from nuclear gene defects. Mutations are either homoplasmic or heteroplasmic, and in the latter case disease becomes manifest when the mutation load exceeds a tissue-specific threshold. Mutation load can vary between tissues and in time, and often an exact correlation between mutation load and clinical manifestations is lacking. Because of the possible clinical severity, the lack of treatment and the high recurrence risk of affected offspring for female carriers, couples request prevention of transmission of mtDNA mutations. Previously, choices have been limited due to a segregational bottleneck, which makes the mtDNA mutation load in embryos highly variable and the consequences largely unpredictable. However, recently it was shown that preimplantation genetic diagnosis offers a fair chance of unaffected offspring to carriers of heteroplasmic mtDNA mutations. Technically and ethically challenging possibilities, such maternal spindle transfer and pronuclear transfer, are emerging and providing carriers additional prospects of giving birth to a healthy child.
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Affiliation(s)
- Hubert J M Smeets
- Unit Clinical Genomics, Department of Genetics and Cell Biology, School for Growth and Development and for Cardiovascular Research, Maastricht University Medical Centre, Maastricht, The Netherlands.
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Yabuuchi A, Beyhan Z, Kagawa N, Mori C, Ezoe K, Kato K, Aono F, Takehara Y, Kato O. Prevention of mitochondrial disease inheritance by assisted reproductive technologies: prospects and challenges. Biochim Biophys Acta Gen Subj 2011; 1820:637-42. [PMID: 22085724 DOI: 10.1016/j.bbagen.2011.10.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2011] [Revised: 10/22/2011] [Accepted: 10/29/2011] [Indexed: 02/04/2023]
Abstract
BACKGROUND Mitochondrial diseases are caused by the mutations in both nuclear and mitochondrial DNA (mtDNA) and the treatment options for patients who have mitochondrial disease are rather limited. Mitochondrial DNA is transmitted maternally and does not follow a Mendelian pattern of inheritance. Since reliable and predictable detection of mitochondrial disorders in embryos and oocytes is unattainable at present, an alternative approach to this problem has emerged as partial or complete replacement of mutated mtDNA with the wild-type mtDNA through embryo manipulations. Currently available methods to achieve this goal are germinal vesicle transfer (GVT), metaphase chromosome transfer (CT), pronuclear transfer (PNT) and ooplasmic transfer (OT). SCOPE OF REVIEW We summarize the state of the art regarding these technologies and discuss the implications of recent advances in the field for clinical practice. MAJOR CONCLUSIONS CT, PNT and GVT techniques hold promise to prevent transmission of mutant mtDNA through ARTs. However, it is clear that mtDNA heteroplasmy in oocytes, embryos and offspring produced by these methods remains as a legitimate concern. GENERAL SIGNIFICANCE New approaches to eliminate transmission of mutant mtDNA certainly need to be explored in order to bring the promise of clinical application for the treatment of mitochondrial disorders. This article is part of a Special Issue entitled Biochemistry of Mitochondria, Life and Intervention 2010.
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Affiliation(s)
- Akiko Yabuuchi
- Advanced medical research institute of Fertility, Kato Ladies Clinic, Shinjuku-ku, Tokyo, Japan.
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Chiaratti MR, Meirelles FV, Wells D, Poulton J. Therapeutic treatments of mtDNA diseases at the earliest stages of human development. Mitochondrion 2011; 11:820-8. [DOI: 10.1016/j.mito.2010.11.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Accepted: 11/29/2010] [Indexed: 11/25/2022]
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Van Blerkom J. Mitochondrial function in the human oocyte and embryo and their role in developmental competence. Mitochondrion 2010; 11:797-813. [PMID: 20933103 DOI: 10.1016/j.mito.2010.09.012] [Citation(s) in RCA: 448] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Revised: 09/28/2010] [Accepted: 09/28/2010] [Indexed: 10/19/2022]
Abstract
The role of mitochondria as a nexus of developmental regulation in mammalian oogenesis and early embryogenesis is emerging from basic research in model species and from clinical studies in infertility treatments that require in vitro fertilization and embryo culture. Here, mitochondrial bioenergetic activities and roles in calcium homeostasis, regulation of cytoplasmic redox state, and signal transduction are discussed with respect to outcome in general, and as possible etiologies of chromosomal defects, maturation and fertilization failure in human oocytes, and as causative factors in early human embryo demise. At present, the ability of mitochondria to balance ATP supply and demand is considered the most critical factor with respect to fertilization competence for the oocyte and developmental competence for the embryo. mtDNA copy number, the timing of mtDNA replication during oocyte maturation, and the numerical size of the mitochondrial complement in the oocyte are evaluated with respect to their relative contribution to the establishment of developmental competence. Rather than net cytoplasmic bioenergetic capacity, the notion of functional compartmentalization of mitochondria is presented as a means by which ATP may be differentially supplied and localized within the cytoplasm by virtue of stage-specific changes in mitochondrial density and potential (ΔΨm). Abnormal patterns of calcium release and sequestration detected at fertilization in the human appear to have coincident effects on levels of mitochondrial ATP generation. These aberrations are not uncommon in oocytes obtained after ovarian hyperstimulation for in vitro fertilization. The possibility that defects in mitochondrial calcium regulation or bioenergetic homeostasis could have negative downstream development consequences, including imprinting disorders, is discussed in the context of signaling pathways and cytoplasmic redox state.
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Affiliation(s)
- Jonathan Van Blerkom
- Department of Molecular, Cellular and Developmental Biology, The University of Colorado, Boulder, Colorado, USA.
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Wallace DC, Fan W, Procaccio V. Mitochondrial energetics and therapeutics. ANNUAL REVIEW OF PATHOLOGY-MECHANISMS OF DISEASE 2010; 5:297-348. [PMID: 20078222 DOI: 10.1146/annurev.pathol.4.110807.092314] [Citation(s) in RCA: 502] [Impact Index Per Article: 35.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Mitochondrial dysfunction has been linked to a wide range of degenerative and metabolic diseases, cancer, and aging. All these clinical manifestations arise from the central role of bioenergetics in cell biology. Although genetic therapies are maturing as the rules of bioenergetic genetics are clarified, metabolic therapies have been ineffectual. This failure results from our limited appreciation of the role of bioenergetics as the interface between the environment and the cell. A systems approach, which, ironically, was first successfully applied over 80 years ago with the introduction of the ketogenic diet, is required. Analysis of the many ways that a shift from carbohydrate glycolytic metabolism to fatty acid and ketone oxidative metabolism may modulate metabolism, signal transduction pathways, and the epigenome gives us an appreciation of the ketogenic diet and the potential for bioenergetic therapeutics.
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Affiliation(s)
- Douglas C Wallace
- Center for Molecular and Mitochondrial Medicine and Genetics and Departments of Biological Chemistry, Ecology and Evolutionary Biology, and Pediatrics, University of California at Irvine, Irvine, California 92697-3940, USA.
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Wang Q, Moley KH. Maternal diabetes and oocyte quality. Mitochondrion 2010; 10:403-10. [PMID: 20226883 DOI: 10.1016/j.mito.2010.03.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Revised: 02/10/2010] [Accepted: 03/04/2010] [Indexed: 02/07/2023]
Abstract
Maternal diabetes has been demonstrated to adversely affect preimplantation embryo development and pregnancy outcomes. Emerging evidence has implicated that these effects are associated with compromised oocyte competence. Several developmental defects during oocyte maturation in diabetic mice have been reported over past decades. Most recently, we further identified the structural, spatial and metabolic dysfunction of mitochondria in oocytes from diabetic mice, suggesting the impaired oocyte quality. These defects in the oocyte may be maternally transmitted to the embryo and then manifested later as developmental abnormalities in preimplantation embryo, congenital malformations, and even metabolic disease in the offspring. In this paper, we briefly review the effects of maternal diabetes on oocyte quality, with a particular emphasis on the mitochondrial dysfunction. The possible connection between dysfunctional oocyte mitochondria and reproductive failure of diabetic females, and the mechanism(s) by which maternal diabetes exerts its effects on the oocyte are also discussed.
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Affiliation(s)
- Qiang Wang
- Department of Obstetrics and Gynecology, Washington University School of Medicine, St Louis, MO 63110, USA
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Ferreira CR, Burgstaller JP, Perecin F, Garcia JM, Chiaratti MR, Méo SC, Müller M, Smith LC, Meirelles FV, Steinborn R. Pronounced Segregation of Donor Mitochondria Introduced by Bovine Ooplasmic Transfer to the Female Germ-Line1. Biol Reprod 2010; 82:563-71. [DOI: 10.1095/biolreprod.109.080564] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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20
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Mitochondrial DNA mutations and human disease. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2009; 1797:113-28. [PMID: 19761752 DOI: 10.1016/j.bbabio.2009.09.005] [Citation(s) in RCA: 417] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2009] [Revised: 09/04/2009] [Accepted: 09/09/2009] [Indexed: 01/07/2023]
Abstract
Mitochondrial disorders are a group of clinically heterogeneous diseases, commonly defined by a lack of cellular energy due to oxidative phosphorylation (OXPHOS) defects. Since the identification of the first human pathological mitochondrial DNA (mtDNA) mutations in 1988, significant efforts have been spent in cataloguing the vast array of causative genetic defects of these disorders. Currently, more than 250 pathogenic mtDNA mutations have been identified. An ever-increasing number of nuclear DNA mutations are also being reported as the majority of proteins involved in mitochondrial metabolism and maintenance are nuclear-encoded. Understanding the phenotypic diversity and elucidating the molecular mechanisms at the basis of these diseases has however proved challenging. Progress has been hampered by the peculiar features of mitochondrial genetics, an inability to manipulate the mitochondrial genome, and difficulties in obtaining suitable models of disease. In this review, we will first outline the unique features of mitochondrial genetics before detailing the diseases and their genetic causes, focusing specifically on primary mtDNA genetic defects. The functional consequences of mtDNA mutations that have been characterised to date will also be discussed, along with current and potential future diagnostic and therapeutic advances.
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Doyle SR, Chan CK. Mitochondrial gene therapy: an evaluation of strategies for the treatment of mitochondrial DNA disorders. Hum Gene Ther 2009; 19:1335-48. [PMID: 18764763 DOI: 10.1089/hum.2008.090] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Mitochondrial DNA (mtDNA) disorders include a vast range of pathological conditions, despite each sharing a mutual inability to produce ATP efficiently as a result of defective oxidative phosphorylation. There is no clear consensus regarding an effective therapeutic approach, and consequently the current treatment strategies are largely supportive rather than curative. This is almost certainly the result of there being virtually no defined genotype-phenotype relationships among the mtDNA disorders; hence an identical mutation may be responsible for multiple phenotypes, or the same phenotype may be produced by different mutations. In light of this, the development of gene therapy to treat mtDNA disorders offers a promising approach, as it potentially circumvents the complication of the aforementioned genotype-phenotype inconsistency and ultimately the current inability to treat individual disorders with sufficient efficacy. Such an approach will ultimately require the combination of efficient mitochondrial targeting, and an effective therapeutic molecule. Although promising proof-of-principle developments in this field have been demonstrated, the realization of a successful therapeutic mitochondrial gene therapy strategy has not come to fruition. This review critiques the key approaches under development by discussing the theory underlying each strategy, and detailing the current progress made. We also emphasize the potential hurdles that must be acknowledged and overcome if the potential of a therapeutic gene therapy to treat mitochondrial DNA disorders is to be realized.
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Affiliation(s)
- Stephen R Doyle
- Department of Genetics and Human Variation, La Trobe University, Melbourne, Victoria 3086, Australia.
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Ramalho-Santos J, Varum S, Amaral S, Mota PC, Sousa AP, Amaral A. Mitochondrial functionality in reproduction: from gonads and gametes to embryos and embryonic stem cells. Hum Reprod Update 2009; 15:553-72. [DOI: 10.1093/humupd/dmp016] [Citation(s) in RCA: 308] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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The inheritance of pathogenic mitochondrial DNA mutations. Biochim Biophys Acta Mol Basis Dis 2009; 1792:1097-102. [PMID: 19303927 PMCID: PMC2785871 DOI: 10.1016/j.bbadis.2009.03.002] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2009] [Revised: 03/09/2009] [Accepted: 03/10/2009] [Indexed: 02/06/2023]
Abstract
Mitochondrial DNA mutations cause disease in > 1 in 5000 of the population, and ∼ 1 in 200 of the population are asymptomatic carriers of a pathogenic mtDNA mutation. Many patients with these pathogenic mtDNA mutations present with a progressive, disabling neurological syndrome that leads to major disability and premature death. There is currently no effective treatment for mitochondrial disorders, placing great emphasis on preventing the transmission of these diseases. An empiric approach can be used to guide genetic counseling for common mtDNA mutations, but many families transmit rare or unique molecular defects. There is therefore a pressing need to develop techniques to prevent transmission based on a solid understanding of the biological mechanisms. Several recent studies have cast new light on the genetics and cell biology of mtDNA inheritance, but these studies have also raised new controversies. Here we compare and contrast these findings and discuss their relevance for the transmission of human mtDNA diseases.
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Vempati UD, Torraco A, Moraes CT. Mouse models of oxidative phosphorylation dysfunction and disease. Methods 2008; 46:241-7. [PMID: 18848991 PMCID: PMC2652743 DOI: 10.1016/j.ymeth.2008.09.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2008] [Revised: 08/28/2008] [Accepted: 09/12/2008] [Indexed: 11/23/2022] Open
Abstract
Oxidative phosphorylation (OXPHOS) deficiency results in a number of human diseases, affecting at least one in 5000 of the general population. Altering the function of genes by mutations are central to our understanding their function. Prior to the development of gene targeting, this approach was limited to rare spontaneous mutations that resulted in a phenotype. Since its discovery, targeted mutagenesis of the mouse germline has proved to be a powerful approach to understand the in vivo function of genes. Gene targeting has yielded remarkable understanding of the role of several gene products in the OXPHOS system. We provide a "tool box" of mouse models with OXPHOS defects that could be used to answer diverse scientific questions.
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Affiliation(s)
| | | | - Carlos T. Moraes
- Department of Neurology, University of Miami, USA
- Department of Cell Biology & Anatomy, University of Miami, USA
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Bredenoord AL, Pennings G, de Wert G. Ooplasmic and nuclear transfer to prevent mitochondrial DNA disorders: conceptual and normative issues. Hum Reprod Update 2008; 14:669-78. [PMID: 18772267 DOI: 10.1093/humupd/dmn035] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
UNLABELLED BACKGROUND; Mitochondrial DNA (mtDNA) disorders are an important cause of human diseases. In view of the limitations of prenatal diagnosis and preimplantation genetic diagnoses, alternatives such as ooplasmic transfer (OT) and nuclear transfer (NT) have been proposed to prevent the transmission of mtDNA mutations. Both OT and NT are radical in the sense that they do not entail genetic selection, but genetic intervention to correct the genetic cause of the disease. METHODS After interviews with experts in the field, the relevant literature was searched and analyzed. Bioethical issues were divided into conceptual and normative points. RESULTS OT is the transfer of normal mitochondria to a carrier's oocyte containing mutant mtDNA. In case of NT, a donated oocyte is enucleated and replaced with the nuclear DNA from a woman carrying a mtDNA mutation. NT can be performed both before and after in vitro fertilization, respectively, with the nucleus of an unfertilized oocyte, with the pronuclei of the zygote, or with the nucleus of a blastomere of an embryo. Conceptual questions regard whether these techniques amount to germ-line modification and human cloning. Normative questions concern, among others, the significance of intervening in the mtDNA, the implications of having 'three genetic parents', the ethics of oocyte donation and the health and safety risks for children conceived as a result of one of these techniques. CONCLUSIONS Further interdisciplinary debate and research is needed to determine whether a clinical application of OT and NT can be morally justified, and if so, under which conditions.
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Affiliation(s)
- A L Bredenoord
- Maastricht University, Health, Ethics and Society and Research Institute GROW, Maastricht, The Netherlands.
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26
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López S, Coll O, Durban M, Hernàndez S, Vidal R, Suy A, Morén C, Casademont J, Cardellach F, Mataró D, Miró Ò, Garrabou G. Mitochondrial DNA Depletion in Oocytes of HIV-Infected Antiretroviral-Treated Infertile Women. Antivir Ther 2008. [DOI: 10.1177/135965350801300607] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background HIV-infected women under highly active antiretroviral therapy (HAART) undergoing in vitro fertilization (IVF) have a lower pregnancy rate than non-infected controls, which depends on oocyte-related factors. We hypothesized that mitochondrial toxicity caused by antiretrovirals could be the underlying mechanism of such disturbance. Methods We have studied 16 and 19 frozen-thawed oocytes obtained after oocyte retrieval IVF cycles from 8 and 14 infertile HIV-infected and uninfected women, respectively, matched by age. At inclusion, HIV-positive women had been infected for >13 years and had received HAART for >9 years, including at least one nucleoside reverse transcriptase inhibitor. All of them had undetectable HIV viral load and a good immunological status. Mitochondrial DNA (mtDNA) content was determined by quantitative real-time PCR in each individual oocyte. Results HIV-infected infertile women on HAART showed significant oocyte mtDNA depletion when compared with uninfected controls (32% mtDNA decrease, P<0.05). This oocyte mtDNA depletion was even greater on those HIV-infected women who failed to become pregnant when compared with controls (39% mtDNA decrease, P=0.03). No significant correlation was found between mtDNA oocyte content and cumulative doses of antiretrovirals or the immunological status of HIV patients. Conclusions Oocytes from infertile HIV-infected HAART-treated women show decreased mtDNA content, and this could explain their poor reproductive outcome.
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Affiliation(s)
- Sònia López
- Mitochondrial Research Laboratory, Internal Medicine Department, IDIBAPS, Hospital Clinic of Barcelona, University of Barcelona, Barcelona, Spain
- CIBER de Enfermedades Raras (CIBERER), Barcelona, Spain
| | - Oriol Coll
- Unit of Assisted Reproduction, Clinica Eugin, Barcelona, Spain
| | - Mercè Durban
- Unit of Assisted Reproduction, Clinica Eugin, Barcelona, Spain
| | | | - Ricard Vidal
- Unit of Assisted Reproduction, Clinica Eugin, Barcelona, Spain
| | - Anna Suy
- Unit of Assisted Reproduction, Clinica Eugin, Barcelona, Spain
| | - Constanza Morén
- Mitochondrial Research Laboratory, Internal Medicine Department, IDIBAPS, Hospital Clinic of Barcelona, University of Barcelona, Barcelona, Spain
- CIBER de Enfermedades Raras (CIBERER), Barcelona, Spain
| | - Jordi Casademont
- Mitochondrial Research Laboratory, Internal Medicine Department, IDIBAPS, Hospital Clinic of Barcelona, University of Barcelona, Barcelona, Spain
- CIBER de Enfermedades Raras (CIBERER), Barcelona, Spain
| | - Francesc Cardellach
- Mitochondrial Research Laboratory, Internal Medicine Department, IDIBAPS, Hospital Clinic of Barcelona, University of Barcelona, Barcelona, Spain
- CIBER de Enfermedades Raras (CIBERER), Barcelona, Spain
| | - Daniel Mataró
- Unit of Assisted Reproduction, Clinica Eugin, Barcelona, Spain
| | - Òscar Miró
- Mitochondrial Research Laboratory, Internal Medicine Department, IDIBAPS, Hospital Clinic of Barcelona, University of Barcelona, Barcelona, Spain
- CIBER de Enfermedades Raras (CIBERER), Barcelona, Spain
| | - Glòria Garrabou
- Mitochondrial Research Laboratory, Internal Medicine Department, IDIBAPS, Hospital Clinic of Barcelona, University of Barcelona, Barcelona, Spain
- CIBER de Enfermedades Raras (CIBERER), Barcelona, Spain
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Bredenoord A, Pennings G, Smeets H, de Wert G. Dealing with uncertainties: ethics of prenatal diagnosis and preimplantation genetic diagnosis to prevent mitochondrial disorders. Hum Reprod Update 2007; 14:83-94. [DOI: 10.1093/humupd/dmm037] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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28
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Abstract
The magnitude of the potential difference (polarity) across the inner mitochondrial membrane (DeltaPsim) determines levels of several mitochondrial activities, including ATP generation, focal regulate calcium homeostasis and organelle volume homeostasis. We investigated whether a domain of mitochondria in the mouse oocyte, characterized by high DeltaPsim and a unique location in the subplasmalemmal cytoplasm, is involved in the earliest events of fertilization: sperm attachment, penetration and cortical granule exocytosis. Experimental manipulations of the magnitude of DeltaPsim and the distribution of mitochondria in zona-free MII oocytes, followed by insemination and culture, indicate that high-polarized mitochondria (HPM) are required for penetration and cortical granule exocytosis, but not for persistent attachment to the oolemma. The capacity of subplasmalemmal mitochondria to undergo transient reductions (dissipations) of DeltaPsim appears necessary for penetration and cortical granule exocytosis. We suggest that the HPM normally establish a continuous circumferential circuit of 'reactive' organelles capable of responding to and propagating, triggering or activating signals across the subplasmalemmal cytoplasm, such as those initiated by the fertilizing sperm at the site of penetration. The HPM in the oocyte and early embryo may have functions similar to those of their somatic cell counterparts and promote the focal regulation of developmental activities that are themselves spatially localized. The establishment of high DeltaPsim in the subplasmalemmal cytoplasm may be among the first steps in the preovulatory maturation of the oocyte and defects in this domain may result in fertilization failure or abnormality.
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Affiliation(s)
- Jonathan Van Blerkom
- Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309, USA.
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Blok MJ, Spruijt L, de Coo IFM, Schoonderwoerd K, Hendrickx A, Smeets HJ. Mutations in the ND5 subunit of complex I of the mitochondrial DNA are a frequent cause of oxidative phosphorylation disease. J Med Genet 2007; 44:e74. [PMID: 17400793 PMCID: PMC2598042 DOI: 10.1136/jmg.2006.045716] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Detection of mutations in the mitochondrial DNA (mtDNA) is usually limited to common mutations and the transfer RNA genes. However, mutations in other mtDNA regions can be an important cause of oxidative phosphorylation (OXPHOS) disease as well. OBJECTIVE To investigate whether regions in the mtDNA are preferentially mutated in patients with OXPHOS disease. METHODS Screening of the mtDNA for heteroplasmic mutations was performed by denaturing high-performance liquid chromatography analysis of 116 patients with OXPHOS disease but without the common mtDNA mutations. RESULTS An mtDNA sequence variant was detected in 15 patients, 5 of which were present in the ND5 gene. One sequence variant was new and three were known, one of which was found twice. The novel sequence variant m.13511A-->T occurred in a patient with a Leigh-like syndrome. The known mutation m.13513G-->A, associated with mitochondrial encephalomyopathy lactic acidosis and stroke-like syndrome (MELAS) and MELAS/Leigh/Leber hereditary optic neuropathy overlap syndrome, was found in a relatively low percentage in two patients from two different families, one with a MELAS/Leigh phenotype and one with a MELAS/chronic progressive external ophthalmoplegia phenotype. The known mutation m.13042G-->A, detected previously in a patient with a MELAS/myoclonic epilepsy, ragged red fibres phenotype and in a family with a prevalent ocular phenotype, was now found in a patient with a Leigh-like phenotype. The sequence variant m.12622G-->A was reported once in a control database as a polymorphism, but is reported in this paper as heteroplasmic in three brothers, all with infantile encephalopathy (Leigh syndrome) fatal within the first 15 days of life. Therefore, a causal relationship between the presence of this sequence variant and the onset of mitochondrial disease cannot be entirely excluded at this moment. CONCLUSIONS Mutation screening of the ND5 gene is advised for routine diagnostics of patients with OXPHOS disease, especially for those with MELAS- and Leigh-like syndrome with a complex I deficiency.
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Affiliation(s)
- M J Blok
- Department of Clinical Genetics, University Hospital, Maastricht, The Netherlands.
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Abstract
In mammals, mitochondria and mitochondrial DNA (mtDNA) are transmitted through the female germ line. Mature oocytes contain at least 100,000 copies of mtDNA, organized at 1-2 copies per organelle. Despite the high genome copy number, mtDNA sequence variants are observed to segregate rapidly between generations, and this has led to the concept of a developmental bottleneck for the transmission of mtDNA. Ultrastructural investigations of primordial germ cells show that they contain approximately 10 mitochondria, suggesting that mitochondrial biogenesis is arrested during early embryogenesis, and that the mitochondria contributing to the germ cell precursors are simply apportioned from those present in the zygote. Thus, as few as 0.01% of the mitochondria in the oocyte actually contribute to the offspring of the next generation. Mitochondrial replication restarts in the migrating primordial germ cells, and mitochondrial numbers steadily increase to a few thousand in primordial oocytes. Genetic evidence from both heteroplasmic mice and human pedigrees suggests that segregation of mtDNA sequence variants is largely a stochastic process that occurs during the mitotic divisions of the germ cell precursors. This process is essentially complete by the time the primary oocyte population is differentiated in fetal life. Analysis of the distribution of pathogenic mtDNA mutations in the offspring of carrier mothers shows that risk of inheriting a pathogenic mutation increases with the proportion in the mother, but there is no bias toward transmitting more or less of the mutant mtDNAs. This implies that there is no strong selection against oocytes carrying pathogenic mutations and that atresia is not a filter for oocyte quality based on oxidative phosphorylation capacity. The large number of mitochondria and mtDNAs present in the oocyte may simply represent a genetic mechanism to ensure their distribution to the gametes and somatic cells of the next generation. If true, mtDNA copy number, and by inference mitochondrial number, may be the most important determinant of oocyte quality, not because of the effects on oocyte metabolism, but because too few would result in a maldistribution in the early embryo.
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Affiliation(s)
- Eric A Shoubridge
- Department of Human Genetics, Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada
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