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De Coster T, Masset H, Tšuiko O, Catteeuw M, Zhao Y, Dierckxsens N, Aparicio AL, Dimitriadou E, Debrock S, Peeraer K, de Ruijter-Villani M, Smits K, Van Soom A, Vermeesch JR. Parental genomes segregate into distinct blastomeres during multipolar zygotic divisions leading to mixoploid and chimeric blastocysts. Genome Biol 2022; 23:201. [PMID: 36184650 PMCID: PMC9528162 DOI: 10.1186/s13059-022-02763-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 08/31/2022] [Indexed: 11/23/2022] Open
Abstract
Background During normal zygotic division, two haploid parental genomes replicate, unite and segregate into two biparental diploid blastomeres. Results Contrary to this fundamental biological tenet, we demonstrate here that parental genomes can segregate to distinct blastomeres during the zygotic division resulting in haploid or uniparental diploid and polyploid cells, a phenomenon coined heterogoneic division. By mapping the genomic landscape of 82 blastomeres from 25 bovine zygotes, we show that multipolar zygotic division is a tell-tale of whole-genome segregation errors. Based on the haplotypes and live-imaging of zygotic divisions, we demonstrate that various combinations of androgenetic, gynogenetic, diploid, and polyploid blastomeres arise via distinct parental genome segregation errors including the formation of additional paternal, private parental, or tripolar spindles, or by extrusion of paternal genomes. Hence, we provide evidence that private parental spindles, if failing to congress before anaphase, can lead to whole-genome segregation errors. In addition, anuclear blastomeres are common, indicating that cytokinesis can be uncoupled from karyokinesis. Dissociation of blastocyst-stage embryos further demonstrates that whole-genome segregation errors might lead to mixoploid or chimeric development in both human and cow. Yet, following multipolar zygotic division, fewer embryos reach the blastocyst stage and diploidization occurs frequently indicating that alternatively, blastomeres with genome-wide errors resulting from whole-genome segregation errors can be selected against or contribute to embryonic arrest. Conclusions Heterogoneic zygotic division provides an overarching paradigm for the development of mixoploid and chimeric individuals and moles and can be an important cause of embryonic and fetal arrest following natural conception or IVF. Supplementary Information The online version contains supplementary material available at 10.1186/s13059-022-02763-2.
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Affiliation(s)
- Tine De Coster
- Laboratory for Cytogenetics and Genome Research, Department of Human Genetics, KU Leuven, 3000, Leuven, Belgium.,Reproductive Biology Unit, Department of Internal Medicine, Reproduction and Population Medicine, Ghent University, 9820, Merelbeke, Belgium
| | - Heleen Masset
- Laboratory for Cytogenetics and Genome Research, Department of Human Genetics, KU Leuven, 3000, Leuven, Belgium
| | - Olga Tšuiko
- Laboratory for Cytogenetics and Genome Research, Department of Human Genetics, KU Leuven, 3000, Leuven, Belgium
| | - Maaike Catteeuw
- Reproductive Biology Unit, Department of Internal Medicine, Reproduction and Population Medicine, Ghent University, 9820, Merelbeke, Belgium
| | - Yan Zhao
- Laboratory for Cytogenetics and Genome Research, Department of Human Genetics, KU Leuven, 3000, Leuven, Belgium
| | - Nicolas Dierckxsens
- Laboratory for Cytogenetics and Genome Research, Department of Human Genetics, KU Leuven, 3000, Leuven, Belgium
| | - Ainhoa Larreategui Aparicio
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Utrecht University, 3584CM, Utrecht, The Netherlands.,Hubrecht Institute, 3584CT, Utrecht, The Netherlands
| | - Eftychia Dimitriadou
- Laboratory for Cytogenetics and Genome Research, Department of Human Genetics, KU Leuven, 3000, Leuven, Belgium
| | - Sophie Debrock
- Leuven University Fertility Center, University Hospitals of Leuven, 3000, Leuven, Belgium
| | - Karen Peeraer
- Leuven University Fertility Center, University Hospitals of Leuven, 3000, Leuven, Belgium
| | - Marta de Ruijter-Villani
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Utrecht University, 3584CM, Utrecht, The Netherlands.,Hubrecht Institute, 3584CT, Utrecht, The Netherlands.,Division of Woman and Baby, Department Obstetrics and Gynaecology, University Medical Centre Utrecht, 3508, GA, Utrecht, The Netherlands
| | - Katrien Smits
- Reproductive Biology Unit, Department of Internal Medicine, Reproduction and Population Medicine, Ghent University, 9820, Merelbeke, Belgium
| | - Ann Van Soom
- Reproductive Biology Unit, Department of Internal Medicine, Reproduction and Population Medicine, Ghent University, 9820, Merelbeke, Belgium
| | - Joris Robert Vermeesch
- Laboratory for Cytogenetics and Genome Research, Department of Human Genetics, KU Leuven, 3000, Leuven, Belgium.
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Gabbett MT, Laporte J, Sekar R, Nandini A, McGrath P, Sapkota Y, Jiang P, Zhang H, Burgess T, Montgomery GW, Chiu R, Fisk NM. Molecular Support for Heterogonesis Resulting in Sesquizygotic Twinning. N Engl J Med 2019; 380:842-849. [PMID: 30811910 DOI: 10.1056/nejmoa1701313] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Sesquizygotic multiple pregnancy is an exceptional intermediate between monozygotic and dizygotic twinning. We report a monochorionic twin pregnancy with fetal sex discordance. Genotyping of amniotic fluid from each sac showed that the twins were maternally identical but chimerically shared 78% of their paternal genome, which makes them genetically in between monozygotic and dizygotic; they are sesquizygotic. We observed no evidence of sesquizygosis in 968 dizygotic twin pairs whom we screened by means of pangenome single-nucleotide polymorphism genotyping. Data from published repositories also show that sesquizygosis is a rare event. Detailed genotyping implicates chimerism arising at the juncture of zygotic division, termed heterogonesis, as the likely initial step in the causation of sesquizygosis.
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Affiliation(s)
- Michael T Gabbett
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
| | - Johanna Laporte
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
| | - Renuka Sekar
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
| | - Adayapalam Nandini
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
| | - Pauline McGrath
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
| | - Yadav Sapkota
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
| | - Peiyong Jiang
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
| | - Haiqiang Zhang
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
| | - Trent Burgess
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
| | - Grant W Montgomery
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
| | - Rossa Chiu
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
| | - Nicholas M Fisk
- From the School of Biomedical Sciences and the Institute of Health and Biomedical Innovation, Queensland University of Technology (M.T.G.), the School of Medicine (M.T.G., J.L., R.S.), the Institute for Molecular Bioscience (G.W.M.), and the Centre for Clinical Research (N.M.F.), University of Queensland, Genetic Health Queensland (M.T.G., P.M.), the Centre for Advanced Prenatal Care (J.L., R.S., N.M.F.), and the Department of Cytogenetics (A.N.), Royal Brisbane and Women's Hospital, and QIMR Berghofer Medical Research Institute (Y.S., G.W.M.), Brisbane, the School of Medicine, Griffith University, Gold Coast, QLD (M.T.G.), Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Melbourne, VIC (T.B.), the Department of Pediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC (T.B.), and the Faculty of Medicine, University of New South Wales, Sydney (N.M.F.) - all in Australia; and Li Ka Shing Institute of Health Sciences, Department of Chemical Pathology, Chinese University of Hong Kong, Hong Kong (P.J., H.Z., R.C.)
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3
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Coticchio G, Mignini Renzini M, Novara PV, Lain M, De Ponti E, Turchi D, Fadini R, Dal Canto M. Focused time-lapse analysis reveals novel aspects of human fertilization and suggests new parameters of embryo viability. Hum Reprod 2019; 33:23-31. [PMID: 29149327 DOI: 10.1093/humrep/dex344] [Citation(s) in RCA: 83] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 10/25/2017] [Indexed: 12/14/2022] Open
Abstract
STUDY QUESTION Can focused application of time-lapse microscopy (TLM) lead to a more detailed map of the morphokinetics of human fertilization, revealing novel or neglected aspects of this process? SUMMARY ANSWER Intensive harnessing of TLM reveals novel or previously poorly characterised phenomena of fertilization, such as a cytoplasmic wave (CW) preceding pronuclear formation and kinetics of pronuclear chromatin polarization, thereby suggesting novel non-invasive biomarkers of embryo quality. WHAT IS KNOWN ALREADY In recent years, human preimplantation development has been the object of TLM studies with the intent to develop morphokinetic algorithms able to predict blastocyst formation and implantation. Regardless, our appreciation of the morphokinetics of fertilization remains rather scarce, currently including only times of polar body II (PBII) emission, pronuclear appearance and fading, and first cleavage. This is not consistent with the complexity and importance of this process, calling for further TLM studies aimed at describing previously unrecognized or undetected morphokinetic events and identifying novel developmental biomarkers. STUDY DESIGN, SIZE, DURATION The study involved a retrospective observation by TLM of the fertilization process in 500 oocytes utilized in consecutive ICSI cycles carried out in 2016. A maximum of five fertilized oocytes per patients were included in the analysis to reduce possible patient-specific biases. Oocytes of patients with different diagnoses of infertility where included in the analysis, while cases involving cryopreserved gametes or surgically retrieved sperm were excluded. PARTICIPANTS/MATERIALS, SETTINGS, METHODS Microinjected oocytes where assessed by a combined TLM-culture system (Embryoscope). Oocytes that were not amenable to TLM assessment, due to excess of residual corona cells or inadequate orientation for the observation of PBII emission, were not analysed. We identified and monitored 28 parameters relevant to meiotic resumption, pronuclear dynamics, chromatin organization, and cytoplasmic/cortical modifications. Times (T) were expressed as mean ± SD hours post-insemination (p.i.) and analysed, where appropriate, by Paired T Student or Fisher's exact tests. MAIN RESULTS AND ROLE OF CHANCE PBII emission was occasionally followed (4.3% of cases) by the transient appearance of a protrusion of the cell surface, the fertilization cone (FC), probably resulting from interaction of the male chromatin with the oocyte cortex. Pronuclear formation was always preceded by a radial CW originating from the initial position of the male pronucleus (PN) and extending towards the oocyte periphery. The appearance of the CW followed a precise sequence, occurring always 2-3 h after PBII emission and shortly before PN appearance. Male and female PN appeared virtually simultaneously at approximately 6.2 h p.i. However, while the female PN always formed cortically and near the site of emission of the PBII, the initial position of the male PN was cortical, intermediate, or central (15.2%, 31.2% and 53.6%, respectively). PN juxtaposition involved rapid and straight movement of the female PN towards the male PN. In addition, the initial position of male PN formation was predictive of the position of PN juxtaposition. It was also observed that nucleolar precursor bodies (NPBs) aligned along the juxtaposition area and this happened considerably earlier for the female PN (8.2 ± 2.6 vs.11.2 ± 4.1 h, P = 0.0001). Although it occurred rarely, displacement of juxtaposed PN to the cortex was strongly associated (P < 0.0001) with direct cleavage into three blastomeres at the first cell division. The times of PN breakdown and first cleavage showed a very consistent trend, occurring earlier or progressively later depending on whether initial male PN positioning was central, intermediate or cortical, respectively. Finally, time intervals between discrete fertilization events were strongly associated with embryo quality on Day 3. For example, longer intervals between disappearance of the cytoplasmic halo and PN breakdown were highly predictive of reduced blastomere number and increased fragmentation (P = 0.0001). LARGE SCALE DATA N/A. LIMITATIONS, REASON FOR CAUTION Some of the morphokinetic parameters assessed in this study may require better definition to reduce inter-operator annotation variability. WIDER IMPLICATIONS OF THE FINDINGS To our knowledge, overall, these data represent the most detailed morphokinetic description of human fertilization. Many of the illustrated parameters are novel and may be amenable to further elaboration into algorithms able to predict embryo quality, as suggested by the findings presented in this study. STUDY FUNDING/COMPETING INTERESTS None.
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Affiliation(s)
- G Coticchio
- Biogenesi, Reproductive Medicine Centre, Monza, Italy
| | | | - P V Novara
- Biogenesi, Reproductive Medicine Centre, Monza, Italy
| | - M Lain
- Biogenesi, Reproductive Medicine Centre, Monza, Italy
| | - E De Ponti
- ASST Monza, Department of Medical Physics, Monza, Italy
| | - D Turchi
- Biogenesi, Reproductive Medicine Centre, Monza, Italy
| | - R Fadini
- Biogenesi, Reproductive Medicine Centre, Monza, Italy
| | - M Dal Canto
- Biogenesi, Reproductive Medicine Centre, Monza, Italy
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7
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Destouni A, Zamani Esteki M, Catteeuw M, Tšuiko O, Dimitriadou E, Smits K, Kurg A, Salumets A, Van Soom A, Voet T, Vermeesch JR. Zygotes segregate entire parental genomes in distinct blastomere lineages causing cleavage-stage chimerism and mixoploidy. Genome Res 2016; 26:567-78. [PMID: 27197242 PMCID: PMC4864459 DOI: 10.1101/gr.200527.115] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 03/15/2016] [Indexed: 11/24/2022]
Abstract
Dramatic genome dynamics, such as chromosome instability, contribute to the remarkable genomic heterogeneity among the blastomeres comprising a single embryo during human preimplantation development. This heterogeneity, when compatible with life, manifests as constitutional mosaicism, chimerism, and mixoploidy in live-born individuals. Chimerism and mixoploidy are defined by the presence of cell lineages with different parental genomes or different ploidy states in a single individual, respectively. Our knowledge of their mechanistic origin results from indirect observations, often when the cell lineages have been subject to rigorous selective pressure during development. Here, we applied haplarithmisis to infer the haplotypes and the copy number of parental genomes in 116 single blastomeres comprising entire preimplantation bovine embryos (n = 23) following in vitro fertilization. We not only demonstrate that chromosome instability is conserved between bovine and human cleavage embryos, but we also discovered that zygotes can spontaneously segregate entire parental genomes into different cell lineages during the first post-zygotic cleavage division. Parental genome segregation was not exclusively triggered by abnormal fertilizations leading to triploid zygotes, but also normally fertilized zygotes can spontaneously segregate entire parental genomes into different cell lineages during cleavage of the zygote. We coin the term "heterogoneic division" to indicate the events leading to noncanonical zygotic cytokinesis, segregating the parental genomes into distinct cell lineages. Persistence of those cell lines during development is a likely cause of chimerism and mixoploidy in mammals.
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Affiliation(s)
- Aspasia Destouni
- Laboratory of Cytogenetics and Genome Research, Center of Human Genetics, KU Leuven, Leuven, 3000, Belgium
| | - Masoud Zamani Esteki
- Laboratory of Reproductive Genomics, Center of Human Genetics, KU Leuven, Leuven, 3000, Belgium
| | - Maaike Catteeuw
- Department of Obstetrics, Reproduction and Herd Health, Ghent University, Ghent, 9820, Belgium
| | - Olga Tšuiko
- Laboratory of Cytogenetics and Genome Research, Center of Human Genetics, KU Leuven, Leuven, 3000, Belgium; Institute of Molecular and Cell Biology, Tartu University, Tartu, 51010, Estonia
| | - Eftychia Dimitriadou
- Laboratory of Cytogenetics and Genome Research, Center of Human Genetics, KU Leuven, Leuven, 3000, Belgium
| | - Katrien Smits
- Department of Obstetrics, Reproduction and Herd Health, Ghent University, Ghent, 9820, Belgium
| | - Ants Kurg
- Institute of Molecular and Cell Biology, Tartu University, Tartu, 51010, Estonia
| | - Andres Salumets
- Competence Centre on Health Technologies, Tartu, 50410, Estonia; Department of Obstetrics and Gynecology, University of Tartu, Tartu, 51014, Estonia
| | - Ann Van Soom
- Department of Obstetrics, Reproduction and Herd Health, Ghent University, Ghent, 9820, Belgium
| | - Thierry Voet
- Laboratory of Reproductive Genomics, Center of Human Genetics, KU Leuven, Leuven, 3000, Belgium; Sanger-EBI Single Cell Genomics Centre, Wellcome Trust Sanger Institute, Hinxton, Cambridge, CB10 1SA, United Kingdom
| | - Joris R Vermeesch
- Laboratory of Cytogenetics and Genome Research, Center of Human Genetics, KU Leuven, Leuven, 3000, Belgium
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