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Lebovitz O, Noach-Hirsh M, Taieb S, Haas J, Zilberberg E, Nahum R, Orvieto R, Aizer A. Embryos derived from single pronucleus are suitable for preimplantation genetic testing. Fertil Steril 2024:S0015-0282(24)00462-X. [PMID: 38788891 DOI: 10.1016/j.fertnstert.2024.05.152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 05/14/2024] [Accepted: 05/16/2024] [Indexed: 05/26/2024]
Abstract
OBJECTIVE To study and compare the preimplantation genetic testing for monogenic disorders (PGT-M) results, and to evaluate the treatment cycle outcomes of embryos derived from a single pronucleus (1PN) vs. two pronuclei (2PN). DESIGN A retrospective cohort study from January 2018 to December 2022 involving in vitro fertilization (IVF)-PGT-M treatment cycles. SETTING Single, academically affiliated fertility center. PATIENTS A total of 244 patients underwent 351 IVF-PGT-M treatment cycles. INTERVENTION Embryo biopsy with molecular testing for a monogenic disorder. MAIN OUTCOME MEASURES The molecular diagnosis results and clinical outcomes after the transfer of embryos derived from 1PN and 2PN in IVF-PGT-M treatment cycles. RESULTS Embryos derived from 1PN have a significantly low developmental potential with a lower rate of embryos that underwent biopsy compared with 2PN-derived embryos; 1PN-derived embryos demonstrated a significantly lower number of blastocysts (24% vs. 37.9%) and top-quality blastocysts (22.3% vs. 48.1%) compared with 2PN-derived embryos. Lower successfully completed and unaffected PGT-M results were achieved in 1PN compared with 2PN-derived embryos (47.1% vs. 65.5% and 18.7% vs. 31.6%, respectively), with significantly higher abnormal molecular results (39.6% vs. 22.7%). The embryo transfer of 24 1PN-derived embryos with no affected genetic disorder resulted in 5 (20.8%) clinical pregnancies and 4 (16.7%) live births (LBs). CONCLUSIONS Within the limits of fewer embryos derived from 1PN that yielded unaffected embryos suitable for transfer, the clinical pregnancy and LB rate of 1PN embryos undergoing PGT-M are reassuring. We, therefore, suggest applying PGT-M to embryos derived from 1PN embryos to improve the cumulative clinical pregnancy and LB rates.
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Affiliation(s)
- Oshrit Lebovitz
- Department of Obstetrics and Gynecology, IVF Unit, Chaim Sheba Medical Center, Tel- Hashomer, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
| | - Meirav Noach-Hirsh
- Department of Obstetrics and Gynecology, IVF Unit, Chaim Sheba Medical Center, Tel- Hashomer, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Sarah Taieb
- Department of Obstetrics and Gynecology, IVF Unit, Chaim Sheba Medical Center, Tel- Hashomer, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Jigal Haas
- Department of Obstetrics and Gynecology, IVF Unit, Chaim Sheba Medical Center, Tel- Hashomer, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Eran Zilberberg
- Department of Obstetrics and Gynecology, IVF Unit, Chaim Sheba Medical Center, Tel- Hashomer, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Ravit Nahum
- Department of Obstetrics and Gynecology, IVF Unit, Chaim Sheba Medical Center, Tel- Hashomer, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Raoul Orvieto
- Department of Obstetrics and Gynecology, IVF Unit, Chaim Sheba Medical Center, Tel- Hashomer, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; The Tarnesby-Tarnowski Chair for Family Planning and Fertility Regulation at the Tel Aviv Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Adva Aizer
- Department of Obstetrics and Gynecology, IVF Unit, Chaim Sheba Medical Center, Tel- Hashomer, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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Tong X, Jin J, Xue Y, Fang L, Zhu H, Jiang L, Zhang S. Clinical outcomes of frozen-thawed blastocysts from zygotes with no or one pronucleus for in vitro fertilization and intracytoplasmic sperm injection cycles. Arch Gynecol Obstet 2023; 308:1015-1022. [PMID: 37391645 PMCID: PMC10348965 DOI: 10.1007/s00404-023-07118-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Accepted: 06/20/2023] [Indexed: 07/02/2023]
Abstract
PURPOSE To investigate the clinical outcomes of in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI) cycles using frozen-thawed blastocyst transfers derived from zygotes with no (0PN) or one pronucleus (1PN). METHODS This retrospective study included 7084 0PN, 2238 1PN, and 72,266 two pronuclear (2PN) embryos cultured to the blastocyst stage from 19,631 IVF and 12,377 ICSI cycles between March 2018 and December 2021. Developmental potential and clinical outcomes of 0PN, 1PN, and 2PN embryos were analyzed. A total of 290 0PN-, 92 1PN-, and 1906 2PN-derived single frozen-thawed blastocyst transfers were performed. Chromosome euploid rates of 0PN-, 1PN-, and 2PN-derived blastocysts were analyzed by next-generation sequencing. Euploid 0PN- and 1PN-derived blastocysts underwent subsequent Infinium Asian Screening Array gene chip analysis to detect ploidy alterations. RESULTS Available blastocyst rates of 0PN and 1PN embryos were significantly lower than those of 2PN embryos in both IVF and ICSI cycles. Single 0PN and 1PN blastocysts transferred in frozen-thawed cycles resulted in a similar clinical pregnancy rate, miscarriage rate, live birth rate, and neonatal outcome to 2PN blastocysts in IVF and ICSI cycles. Genetic analysis showed that euploid rates of 0PN- and 1PN-derived blastocysts used for ICSI cycles were similar to that of 2PN-derived blastocysts. CONCLUSION Our study indicated that 0PN- and 1PN-derived blastocysts resulted in similar clinical outcomes to 2PN-derived blastocysts. The 0PN- and 1PN-derived blastocysts from ICSI cycles can be transferred as well as those from IVF cycles when the number of 2PN-derived blastocysts is insufficient.
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Affiliation(s)
- Xiaomei Tong
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Shangcheng District, No. 3 Qingchun East Road, Hangzhou, 310016, China
- Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Hangzhou, 310016, China
| | - Jiamin Jin
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Shangcheng District, No. 3 Qingchun East Road, Hangzhou, 310016, China
- Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Hangzhou, 310016, China
| | - Yamei Xue
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Shangcheng District, No. 3 Qingchun East Road, Hangzhou, 310016, China
- Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Hangzhou, 310016, China
| | - Lu Fang
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Shangcheng District, No. 3 Qingchun East Road, Hangzhou, 310016, China
- Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Hangzhou, 310016, China
| | - Haiyan Zhu
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Shangcheng District, No. 3 Qingchun East Road, Hangzhou, 310016, China
- Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Hangzhou, 310016, China
| | - Lingying Jiang
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Shangcheng District, No. 3 Qingchun East Road, Hangzhou, 310016, China.
- Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Hangzhou, 310016, China.
| | - Songying Zhang
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Shangcheng District, No. 3 Qingchun East Road, Hangzhou, 310016, China.
- Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Hangzhou, 310016, China.
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Canon C, Thurman A, Li A, Hernandez-Nieto C, Lee JA, Roth RM, Slifkin R, Briton-Jones C, Stein D, Copperman AB. Assessing the clinical viability of micro 3 pronuclei zygotes. J Assist Reprod Genet 2023; 40:1765-1772. [PMID: 37227570 PMCID: PMC10352191 DOI: 10.1007/s10815-023-02830-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Accepted: 05/09/2023] [Indexed: 05/26/2023] Open
Abstract
PURPOSE What is the rate of euploidy and clinical viability of embryos resulting from micro 3 pronuclei zygotes? METHODS Retrospective cohort analysis in a single, academic in vitro fertilization (IVF) center from March 2018 to June 2021. Cohorts were separated by fertilization as either a 2 pronuclear zygote (2PN) or micro 3 pronuclear zygote (micro 3PN). PGT-A was performed to identify embryonic ploidy rates in embryos created from micro 3PN zygotes. The clinical outcomes of all transferred euploid micro 3PN zygotes were evaluated from frozen embryo transfer (FET) cycles. RESULTS During the designated study period, 75,903 mature oocytes were retrieved and underwent ICSI. Of these, 60,161 were fertilized as 2PN zygotes (79.3%) and 183 fertilized as micro 3PN zygotes (0.24%). Of the micro 3PN-derived embryos that underwent biopsy, 27.5% (n=11/42) were deemed euploid by PGT-A, compared to 51.4% (n=12,301/23,923) of 2PN-derived embryos, p=0.06. Four micro 3PN-derived embryos were transferred in subsequent single euploid FET cycles, which includes one live birth and one ongoing pregnancy. CONCLUSION Micro 3PN zygotes that develop to the blastocyst stage and meet the criteria for embryo biopsy have the potential to be euploid by preimplantation genetic testing for aneuploidy (PGT-A) and if selected for transfer can achieve a live birth. Although there are a significantly lower number of micro 3PN embryos that make it to blastocyst biopsy, the potential to continue to culture abnormally fertilized oocytes may give these patients a chance at pregnancy that they previously did not have.
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Affiliation(s)
- Chelsea Canon
- Department of Obstetrics, Gynecology, and Reproductive Science, Icahn School of Medicine at Mount Sinai, Klingenstein Pavilion, 9th Floor, 1176 Fifth Avenue, New York, NY, 10029, USA.
- Reproductive Medicine Associates of New York, 635 Madison Avenue, 10th Floor, New York, NY, 10022, USA.
| | - Anabel Thurman
- Reproductive Medicine Associates of New York, 635 Madison Avenue, 10th Floor, New York, NY, 10022, USA
| | - Albert Li
- Reproductive Medicine Associates of New York, 635 Madison Avenue, 10th Floor, New York, NY, 10022, USA
| | - Carlos Hernandez-Nieto
- Reproductive Medicine Associates of New York, 635 Madison Avenue, 10th Floor, New York, NY, 10022, USA
| | - Joseph A Lee
- Reproductive Medicine Associates of New York, 635 Madison Avenue, 10th Floor, New York, NY, 10022, USA
| | - Rose Marie Roth
- Reproductive Medicine Associates of New York, 635 Madison Avenue, 10th Floor, New York, NY, 10022, USA
| | - Richard Slifkin
- Reproductive Medicine Associates of New York, 635 Madison Avenue, 10th Floor, New York, NY, 10022, USA
| | - Christine Briton-Jones
- Reproductive Medicine Associates of New York, 635 Madison Avenue, 10th Floor, New York, NY, 10022, USA
| | - Daniel Stein
- Department of Obstetrics, Gynecology, and Reproductive Science, Icahn School of Medicine at Mount Sinai, Klingenstein Pavilion, 9th Floor, 1176 Fifth Avenue, New York, NY, 10029, USA
- Reproductive Medicine Associates of New York, 635 Madison Avenue, 10th Floor, New York, NY, 10022, USA
| | - Alan B Copperman
- Department of Obstetrics, Gynecology, and Reproductive Science, Icahn School of Medicine at Mount Sinai, Klingenstein Pavilion, 9th Floor, 1176 Fifth Avenue, New York, NY, 10029, USA
- Reproductive Medicine Associates of New York, 635 Madison Avenue, 10th Floor, New York, NY, 10022, USA
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Wang T, Si J, Wang B, Yin M, Yu W, Jin W, Lyu Q, Long H. Prediction of live birth in vitrified-warmed 1PN-derived blastocyst transfer: Overall quality grade, ICM, TE, and expansion degree. Front Physiol 2022; 13:964360. [DOI: 10.3389/fphys.2022.964360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 10/24/2022] [Indexed: 11/11/2022] Open
Abstract
Background: Numerous studies have reported that transfer of blastocysts derived from monopronuclear (1PN) zygotes achieved live births. However, the potential value of morphology grading for the prediction of 1PN blastocyst viability is unclear, and the blastocyst selection criterion for successful pregnancy has not been set up yet. The aim of this study is to assess the ability of the blastocyst morphology grading system based on three parameters, namely, inner cell mass (ICM), trophectoderm (TE), and expansion degree and to predict outcomes of a cycle with single 1PN blastocyst transfer.Methods: A total of 266 vitrified-warmed 1PN-derived blastocyst transfer cycles for IVF treatment at Shanghai Ninth People’s Hospital between 2007 and 2020 were included. The study was performed on single blastocyst transfers. Electronic records of patients were retrospectively analyzed. In the current study, the blastocysts were classified into three groups: “good,” 3-6AA, 3-6AB, 3-6BA; “medium,” 3-6BB, 3-6AC, 3-6CA; and “poor,” 3-6BC, 3-6CB, 3-6CC. The basal characteristics, embryo grading, and clinical outcomes were compared between the three groups. The association of morphology parameters with pregnancies and live births was analyzed. Logistic regression was adopted to set up a prediction model of live births.Results: Transfer of the good-quality blastocysts achieved significant higher pregnancies (biochemical pregnancy: 59%; clinical pregnancy: 56.4%, and live birth 48.7%) than those in the group of the medium (biochemical pregnancy: 59%; clinical pregnancy: 49.6%; live birth: 40.4%) or poor-quality (biochemical pregnancy: 38.4%; clinical pregnancy: 34.9%; live birth: 26.7%) blastocysts (p < 0.05). There was a significant association between ICM and live birth. A prediction model of live births involving ICM, TE, and expansion degree was set up.Conclusion: In 1PN transfer cycles, a higher overall blastocyst quality is shown to correlate most strongly with optimal pregnancy and live birth outcomes. The selection of high-quality blastocysts for transfer should consider the ICM score first. The prediction model of live births based on ICM, TE, and expansion degree may help predict successful pregnancy in 1PN single-blastocyst transfer cycles.
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Wei X, Enatsu N, Furuhashi K, Iwasaki T, Kokeguchi S, Shiotani M, Otsuki J. Developmental trajectory of monopronucleated zygotes after in vitro fertilization when they include both male and female genomes. Fertil Steril 2021; 117:213-220. [PMID: 34548166 DOI: 10.1016/j.fertnstert.2021.08.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 08/15/2021] [Accepted: 08/19/2021] [Indexed: 11/04/2022]
Abstract
OBJECTIVE To examine the cause of monopronucleated zygote (1PN) formation that includes both maternal and paternal genomes. DESIGN Retrospective cohort study. SETTING Private fertility clinic. PATIENT(S) A total of 44 1PN and 726 2-pronuclear zygotes from 702 patients were observed using 2 different time-lapse observation systems. INTERVENTION(S) Previously recorded time lapse data were reviewed to examine the mechanism of 1PN formation. MAIN OUTCOME MEASURE(S) The distance between the position of the second polar body extrusion and the fertilization cone or epicenter/starting position of the cytoplasmic wave was measured, and the consequent data were analyzed. Cytoplasmic waves were confirmed using vector analysis software. RESULT(S) The cut-off value for the difference in the distance between the position of the second polar body extrusion and the fertilization cone or the epicenter/starting position of the cytoplasmic wave was 17 μm (AUC: 0.987, 95% CI: 0.976-0.999) for the Embryo Scope and 18 μm (AUC: 0.972, 95% CI: 0.955-0.988) for the iBIS time-lapse observation systems. CONCLUSION(S) In this study, it was found with a high degree of accuracy that a monopronucleus is formed when the fusion of the sperm takes place within 18 μm from the point of the second polar body extrusion. The theoretical chance of 1PN occurrence after in vitro fertilization is 2.7% when the sperm is considered to be fused anywhere in the plasma membrane of an oocyte.
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Affiliation(s)
- Xingqiang Wei
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan; Hanabusa Women's Clinic, Kobe, Japan
| | | | | | | | | | | | - Junko Otsuki
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan; Hanabusa Women's Clinic, Kobe, Japan; Assisted Reproductive Technology Center, Okayama University, Okayama, Japan.
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6
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Martin JH, Slim R. Mono-pronuclear zygotes: a possible manifestation of androgenetic monospermic hydatidiform moles. F S Rep 2021; 2:138-139. [PMID: 34278340 PMCID: PMC8267386 DOI: 10.1016/j.xfre.2021.02.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Affiliation(s)
- Jacinta Hope Martin
- Department of Human Genetics, McGill University Health Centre Research Institute (Glen site), Montréal, Québec, Canada
| | - Rima Slim
- Department of Human Genetics and Obstetrics Gynecology, McGill University Health Centre Research Institute (Glen site), Montréal, Québec, Canada
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Suzuki R, Okada M, Nagai H, Kobayashi J, Sugimura S. Morphokinetic analysis of pronuclei using time-lapse cinematography in bovine zygotes. Theriogenology 2021; 166:55-63. [PMID: 33689928 DOI: 10.1016/j.theriogenology.2021.02.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 02/22/2021] [Accepted: 02/24/2021] [Indexed: 12/29/2022]
Abstract
The morphokinetics of pronuclei (PN) are considered crucial factors affecting embryogenesis in mammals. Whereas, since bovine zygotes contain a large number of cytosolic lipid droplets, detailed observation of PN has not been performed. In this study, we visualized PN using time-lapse cinematography (TLC) with light microscopy for the first time in delipidated bovine zygotes. The proportions of 0 PN, 1PN, 2PN, and multi-PN in delipidated bovine zygotes were 10.1%, 6.5%, 72.7%, and 10.8%, respectively. Abnormal fertilization, including 1 PN and multi-PN, was observed in 15.6% of blastocysts. The times from IVF to PN appearance, PN fading, and first cleavage in 2 PN bovine zygotes that developed into blastocysts were 10.4, 25.5, and 27.6 h, respectively, which were similar to PN morphokinetics in humans. The 2 PN zygotes showed that the prolonged time from IVF to the appearance of PN and from the fading of PN to the first cleavage negatively affected blastocyst formation. The time from appearance to fading of PN in multi-PN zygotes that developed into blastocysts was longer than that in multi-PN zygotes that did not develop into blastocysts. Besides, among zygotes that developed into blastocysts, the time from appearance to fading of PN in multi-PN zygotes was longer than that in 2 PN and 1 PN zygotes. These results suggest that PN morphokinetic abnormalities are associated with subsequent embryonic development. Observation of PN in bovine zygotes by using non-invasive visible light TLC by delipidation could be a powerful tool to clarify the relationship between PN morphokinetics and developmental competence.
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Affiliation(s)
- Ryosuke Suzuki
- Department of Biological Production, Tokyo University of Agriculture and Technology, Tokyo, 183-8538, Japan; Kanagawa Ladies Clinic, Kanagawa, 221-0822, Japan
| | - Mai Okada
- Department of Biological Production, Tokyo University of Agriculture and Technology, Tokyo, 183-8538, Japan
| | - Hiroki Nagai
- Department of Biological Production, Tokyo University of Agriculture and Technology, Tokyo, 183-8538, Japan
| | | | - Satoshi Sugimura
- Department of Biological Production, Tokyo University of Agriculture and Technology, Tokyo, 183-8538, Japan.
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Masset H, Tšuiko O, Vermeesch JR. Genome-wide abnormalities in embryos: Origins and clinical consequences. Prenat Diagn 2021; 41:554-563. [PMID: 33524193 DOI: 10.1002/pd.5895] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 12/03/2020] [Accepted: 12/30/2020] [Indexed: 12/25/2022]
Abstract
Ploidy or genome-wide chromosomal anomalies such as triploidy, diploid/triploid mixoploidy, chimerism, and genome-wide uniparental disomy are the cause of molar pregnancies, embryonic lethality, and developmental disorders. While triploidy and genome-wide uniparental disomy can be ascribed to fertilization or meiotic errors, the mechanisms causing mixoploidy and chimerism remain shrouded in mystery. Different models have been proposed, but all remain hypothetical and controversial, are deduced from the developmental persistent genomic constitutions present in the sample studied and lack direct evidence. New single-cell genomic methodologies, such as single-cell genome-wide haplotyping, provide an extended view of the constitution of normal and abnormal embryos and have further pinpointed the existence of mixoploidy in cleavage-stage embryos. Based on those recent findings, we suggest that genome-wide anomalies, which persist in fetuses and patients, can for a large majority be explained by a noncanonical first zygotic cleavage event, during which maternal and paternal genomes in a single zygote, segregate to different blastomeres. This process, termed heterogoneic division, provides an overarching theoretical basis for the different presentations of mixoploidy and chimerism.
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Affiliation(s)
- Heleen Masset
- Department of Human Genetics, Laboratory for Cytogenetics and Genome Research, KU Leuven, Leuven, Belgium
| | - Olga Tšuiko
- Department of Human Genetics, Laboratory for Cytogenetics and Genome Research, KU Leuven, Leuven, Belgium
| | - Joris R Vermeesch
- Department of Human Genetics, Laboratory for Cytogenetics and Genome Research, KU Leuven, Leuven, Belgium.,Center of Human Genetics, University Hospitals of Leuven, Leuven, Belgium
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9
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Zhou B, Anglin HP, Quaas AM. Molar pregnancy after in vitro fertilization with euploid single embryo transfer. F S Rep 2021; 2:146-149. [PMID: 34278345 PMCID: PMC8267387 DOI: 10.1016/j.xfre.2021.01.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 01/06/2021] [Accepted: 01/08/2021] [Indexed: 11/27/2022] Open
Abstract
Objective To describe a case of molar pregnancy after in vitro fertilization (IVF) resulting from the transfer of a euploid embryo derived from a monopronuclear zygote. Design Case report and review of the literature. Setting Private practice IVF center. Patients A 42-year-old woman, gravida 3 para 0, with advanced maternal age and infertility who underwent IVF. Interventions Preimplantation genetic testing for aneuploidy using next-generation sequencing, single frozen euploid blastocyst transfer, and medical management of suspected missed abortion. Main Outcome Measures Genetic examination of products of conception and correlation with embryonic preimplantation genetic testing for aneuploidy results. Results Transfer of the euploid embryo derived from an abnormally fertilized oocyte (monopronuclear zygote) resulted in a clinical pregnancy suspected to be a missed abortion. Products of conception collected after medical management of the suspected missed abortion were analyzed using next-generation sequencing with the report "46,XX complete molar pregnancy". Conclusions To our knowledge, this is the first account of a complete molar pregnancy resulting from the transfer of a reported euploid embryo, highlighting the importance of understanding the limitations of genetic testing platforms in the setting of abnormally fertilized oocyte-derived embryos.
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Affiliation(s)
- Beth Zhou
- Division of Reproductive Endocrinology and Infertility, University of California, San Diego, California
| | - Helen Paige Anglin
- Division of Reproductive Endocrinology and Infertility, University of California, San Diego, California
| | - Alexander M Quaas
- Division of Reproductive Endocrinology and Infertility, University of California, San Diego, California.,Reproductive Partners San Diego, San Diego, California
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10
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Chen X, Shi S, Mao J, Zou L, Yu K. Developmental Potential of Abnormally Fertilized Oocytes and the Associated Clinical Outcomes. Front Physiol 2020; 11:528424. [PMID: 33250770 PMCID: PMC7672117 DOI: 10.3389/fphys.2020.528424] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 09/16/2020] [Indexed: 11/13/2022] Open
Abstract
This study aims to investigate the embryo development potential of extending the culture of abnormally fertilized zygotes with no pronuclear (0PN), monopronuclear (1PN), and poor-quality day 3 embryos and to determine the associated clinical outcomes. This is a retrospective study performed between January 2014 and May 2018 at Jinhua People's Hospital. The normal developed embryos and the abnormal 0PN, 1PN, and poor-quality day 3 embryos were cultured to day 5 or 6 for embryo transfer. Clinical outcomes resulting from abnormal embryos and normally developed embryos were compared. A total of 6466 embryos (1542 0PN, 852 1PN, and 4072 poor-quality day 3 embryos) from 831 treatment cycles were cultured to the blastocyst stage. The total blastulation rate was 17.3% (1121/6466) with 18.2% in 0PN, 26.1% in 1PN, and 15.2% in poor-quality day 3 embryos. The rate for good-quality blastocyst formation was 9.5% (616/6466) with 11.2% in 0PN group, 14.8% in 1PN group, and 7.8% in poor-quality day 3 embryos, respectively. Blastulation rates of 0PN and 1PN derived from intracytoplasmic sperm injection (ICSI) were significantly lower compared with the in vitro fertilization group. A total of 243 cycles were transferred with blastocysts originating from abnormal embryos, resulting in 109 (44.9%) clinical pregnancies and 19 (17.4%) miscarriages; in the control group, a total of 350 cycles resulted in 214 (61.1%) clinical pregnancies and 18 (8.4%) miscarriages. The live birth rate was significantly lower in the abnormal embryo group than that in the control group. Collectively, conventional in vitro fertilization derived 0PN and 1PN zygotes, not ICSI, together with day 3 embryos with poor quality, that were able to reach the blastocyst stage and produce a fair pregnancy rate and live birth rate.
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Affiliation(s)
- Xiao Chen
- Reproductive Medicine Center, Jinhua People's Hospital, Jinhua, China
| | - Shuai Shi
- Reproductive Medicine Center, Jinhua People's Hospital, Jinhua, China
| | - Jiating Mao
- Reproductive Medicine Center, Jinhua People's Hospital, Jinhua, China
| | - Libo Zou
- Reproductive Medicine Center, Jinhua People's Hospital, Jinhua, China
| | - Keda Yu
- Reproductive Medicine Center, Jinhua People's Hospital, Jinhua, China
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11
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Hirata K, Goto S, Izumi Y, Taguchi M, Hayashi A, Fujioka M, Ishiko A, Nakanishi K, Kimura F, Murakami T. Chromosome analysis of blastocysts derived from single pronuclear zygotes by array CGH and clinical outcomes by the transfer of single pronuclear zygotes. J Assist Reprod Genet 2020; 37:1645-1652. [PMID: 32415641 PMCID: PMC7376778 DOI: 10.1007/s10815-020-01800-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 04/17/2020] [Indexed: 11/28/2022] Open
Abstract
PURPOSE This study aimed to explore the aneuploidy of blastocysts derived from single pronuclear (1PN) zygotes, almost 75% of which were regarded as diploid, using array CGH and examine the pregnancy outcomes. METHODS Embryonic aneuploidy screening of sixteen embryos from 1PN zygotes and sixteen embryos from 2PN zygotes was performed using array CGH in study 1. In addition, the reproductive outcome of 1761 single blastocysts, after untested frozen-thawed blastocyst transfer in IVF/ICSI patients, was retrospectively analyzed and compared between the 1PN and 2PN groups in study 2. RESULTS The aneuploidy rates were 30.8% (4/13) in 1PN IVF, 33.3% (1/3) in 1PN ICSI, 46.2% (6/13) in 2PN IVF, and 100% (3/3) in 2PN ICSI. The 1PN group achieved clinical pregnancy in 25.0% (7/28) of IVF and 30.0% (3/10) of ICSI, whereas these rates in the 2PN control group were 44.6% (557/1250) of IVF and 37.4% (177/473) of ICSI. No miscarriage occurred in the pregnancies from 1PN zygotes, whereas the rates of miscarriage in the 2PN control group were 22.6% (126/557) in IVF and 22.2% (39/176) in ICSI. The delivery rate was similar in all groups. Ten deliveries in the 1PN group showed no newborn malformation. CONCLUSION Within the limits of the small sample size, our results suggest that the aneuploidy and delivery rates of the blastocysts derived from 1PN zygotes are the same as those derived from 2PN zygotes. Blastocysts derived from 1PN zygotes may be used clinically and could increase the chance of pregnancy.
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Affiliation(s)
| | - Sakae Goto
- Goto Ladies Clinic, Takatsuki, Osaka, Japan
| | - Yoko Izumi
- Goto Ladies Clinic, Takatsuki, Osaka, Japan
| | | | | | | | - Akiko Ishiko
- Department of Obstetrics and Gynecology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | | | - Fuminori Kimura
- Department of Obstetrics and Gynecology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Takashi Murakami
- Department of Obstetrics and Gynecology, Shiga University of Medical Science, Otsu, Shiga, Japan
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Value of transferring embryos derived from monopronucleated (1PN) zygotes at the time of fertilization assessment. ZYGOTE 2020; 28:241-246. [DOI: 10.1017/s096719942000009x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
SummaryThis paper is a retrospective analysis of the sole transfer of monopronucleated zygotes (1PN) embryos both in in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI) to determine the value of transferring embryos formed from 1PN. In fresh cycles, 1PN cleavage-stage embryos (1PN cleavage fresh) were transferred. In frozen–thawed cycles, 1PN blastocyst-stage embryos (1PN blast frozen) were transferred. We used comparison groups: for fresh cycles, 2PN cleavage-stage embryos (2PN cleavage fresh) were transferred; and for frozen–thawed cycles, 2PN blastocyst-stage embryos (2PN blast frozen) were transferred. Comparison groups were matched for cycle and patient characteristics to the 1PN group. Finally, for fresh cycles, live birth rates (LBR) in the 1PN cleavage group were significantly lower than those in 2PN cleavage group, both for IVF [LBR = 7.64% vs. pregnancy rate (PR) = 22.12%, P = 0.003, respectively] and ICSI (LBR = 0% vs. LBR = 20.00%, P < 0.001, respectively). For frozen–thawed IVF cycles, the PR in the 1PN blastocyst group were comparable with those of the 2PN blastocyst group (1PN: LBR = 33.14% vs. 2PN: LBR = 37.24%, P = 0.289, respectively), while in ICSI, the PR in the 1PN blastocyst group were lower than those in the 2PN blastocyst group (LBR = 15.25% vs. LBR = 40.68%, P = 0.002, respectively). So, for IVF, blastocyst culture was capable of selecting normal 1PN embryos for transfer and achieves satisfying outcomes. However, for ICSI, blastocyst culture was not effective enough to eliminate abnormal embryos and 1PN embryo transfer needed to be treated with caution.
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Morphokinetics and in vitro developmental potential of monopronucleated ICSI zygotes until the blastocyst stage. ZYGOTE 2020; 28:217-222. [DOI: 10.1017/s0967199420000027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
SummaryThe aim of this study was to provide a more comprehensive understanding of 1PN intracytoplasmic sperm injection (ICSI) zygotes. To achieve this objective, we assessed whether all 1PN-derived embryos showed a similar morphokinetic pattern, and if the morphokinetic behaviour of 1PN-derived embryos was comparable with that of 2PN-derived embryos. In total, 149 1PN ICSI zygotes (study group) and 195 2PN ICSI zygotes (control group) were included in the study. Embryo development potential was evaluated in terms of blastocyst rate. Morphokinetic parameters, including the pronucleus diameter and kinetics of in vitro development, were also analyzed. Embryos derived from 1PN ICSI zygotes showed impaired development compared with 2PN-derived embryos, with blastocyst rates of 28.9% and 67.2%, respectively. The diameter of the pronucleus of 1PN zygotes was larger than that of 2PN zygotes. When compared with 2PN-derived embryos, those derived from 1PN zygotes had a visible pronucleus for a shorter time, in addition to a longer syngamy time and slower kinetic behaviour from two to nine cells. When 1PN-derived blastocysts and 2PN-derived blastocysts were compared, the developmental kinetics were similar in both groups, except for a delayed and longer duration of the compaction phase in 1PN-derived embryos. In conclusion, monopronucleated ICSI zygotes present differences in developmental capacity and morphokinetic behaviour compared with 2PN ICSI zygotes, showing particular morphokinetic parameters related to pronucleus formation. Only the 1PN ICSI-derived embryos that reached the blastocyst stage have similar morphokinetic development to blastocysts from 2PN zygotes.
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Cell number considerations for blastocyst transfer in younger patients. J Assist Reprod Genet 2020; 37:619-627. [PMID: 31901111 DOI: 10.1007/s10815-019-01681-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 12/27/2019] [Indexed: 10/25/2022] Open
Abstract
OBJECTIVE To investigate the role of the cell number at day 3 in blastocyst selection. DESIGN Observational, retrospective, single-center clinical study. PATIENT(S) In part 1, 1211 single vitrified-warmed blastocyst transfer (SVBT) cycles were identified and reviewed. All the cycles were conventional in vitro fertilization (IVF) cycles and the first embryo transfer cycles. Most of patients had a risk of ovarian hyperstimulation syndrome and were young. In part 2, 864 IVF-derived blastocysts from 292 infertile couples underwent trophectoderm (TE) biopsy for preimplantation genetic testing for aneuploidies (PGT-A). INTERVENTION(S) No patient intervention. MAIN OUTCOME MEASURE(S) The first part was an analysis of the correlation between the cell number at day 3 and live birth rate (LBR) after SVBT, and the second part was an analysis of the correlation between the cell number at day 3 and euploid rate (ER) of blastocysts. RESULT(S) In part 1, after correcting for the effects of other confounders, the cell number at day 3 had no significant effect on the LBR (OR 1.001, 95% CI 0.938-1.068). In part 2, after correcting for the effects of other confounders, the cell number at day 3 had no significant effect on the ER (OR 0.960, 95% CI 0.866-1.063). CONCLUSION(S) When the vitrified-warmed blastocysts obtained by conventional IVF are transferred into young patients, the cell number at day 3 is not a strong predictor of the LBR. In addition, the cell number at day 3 is not a strong predictor of ER of IVF-derived blastocysts too.
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Si J, Zhu X, Lyu Q, Kuang Y. Obstetrical and neonatal outcomes after transfer of cleavage-stage and blastocyst-stage embryos derived from monopronuclear zygotes: a retrospective cohort study. Fertil Steril 2019; 112:527-533. [DOI: 10.1016/j.fertnstert.2019.04.045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 04/23/2019] [Accepted: 04/30/2019] [Indexed: 10/26/2022]
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Hondo S, Arichi A, Muramatsu H, Omura N, Ito K, Komine H, Monzen S, Mukai N, Endo M, Katase S, Kidera N, Sasaki H, Koi H, Yorimitsu T, Ohara M, Kawamura T, Shimizu Y. Clinical outcomes of transfer of frozen and thawed single blastocysts derived from nonpronuclear and monopronuclear zygotes. Reprod Med Biol 2019; 18:278-283. [PMID: 31312107 PMCID: PMC6613012 DOI: 10.1002/rmb2.12275] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 02/16/2019] [Accepted: 04/15/2019] [Indexed: 11/21/2022] Open
Abstract
PURPOSE In assisted reproductive technology, normal zygotes are bipronuclear (2PN) during fertilization confirmation; however, sometimes, nonpronuclear zygotes (0PN) and monopronuclear zygotes (1PN) are found during routine observations. METHODS To elucidate the clinical usefulness of in vitro-fertilized embryos, we investigated the rates of clinical pregnancy, live birth, miscarriage, and congenital abnormality after transfer of frozen-thawed 1PN- and 0PN-derived single blastocysts at Denentoshi Ladies Clinic, Kanagawa, Japan. RESULTS The rates of pregnancy and live birth for 1PN-derived blastocysts obtained by conventional in vitro fertilization were 37.5% and 27.1%, respectively, which was not significantly different from those for 2PN-derived blastocysts; however, the rates for 0PN-derived blastocysts were significantly lower. The pregnancy and live birth rates for 0PN-derived embryos obtained by intracytoplasmic sperm injection (ICSI) were 45.7% and 34.8%, respectively, which was not significantly different from those for 2PN-derived blastocysts; however, the rates for 1PN-derived blastocysts were significantly lower (4.0% for both) than those for 2PN- and 0PN-derived blastocysts. No congenital abnormalities were found in infants resulting from transfer of 0PN- or 1PN-derived blastocysts. CONCLUSIONS Both 1PN- and 0PN-derived blastocysts can be used for embryo transfer; however, care should be taken in making decisions about 1PN-derived blastocysts, especially if they are obtained by ICSI.
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Affiliation(s)
- Saki Hondo
- Denentoshi Ladies ClinicYokohama‐shiJapan
| | | | | | | | - Kaori Ito
- Denentoshi Ladies Clinic FutakotamagawaSetagaya‐kuJapan
| | | | - Shiho Monzen
- Denentoshi Ladies Clinic FutakotamagawaSetagaya‐kuJapan
| | | | | | | | | | | | - Hideki Koi
- Denentoshi Ladies Clinic FutakotamagawaSetagaya‐kuJapan
| | | | | | - Toshihiro Kawamura
- Denentoshi Ladies ClinicYokohama‐shiJapan
- Denentoshi Ladies Clinic FutakotamagawaSetagaya‐kuJapan
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Destouni A, Dimitriadou E, Masset H, Debrock S, Melotte C, Van Den Bogaert K, Zamani Esteki M, Ding J, Voet T, Denayer E, de Ravel T, Legius E, Meuleman C, Peeraer K, Vermeesch JR. Genome-wide haplotyping embryos developing from 0PN and 1PN zygotes increases transferrable embryos in PGT-M. Hum Reprod 2019; 33:2302-2311. [PMID: 30383227 PMCID: PMC6238370 DOI: 10.1093/humrep/dey325] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Accepted: 10/14/2018] [Indexed: 02/06/2023] Open
Abstract
STUDY QUESTION Can genome-wide haplotyping increase success following preimplantation genetic testing for a monogenic disorder (PGT-M) by including zygotes with absence of pronuclei (0PN) or the presence of only one pronucleus (1PN)? SUMMARY ANSWER Genome-wide haplotyping 0PNs and 1PNs increases the number of PGT-M cycles reaching embryo transfer (ET) by 81% and the live-birth rate by 75%. WHAT IS KNOWN ALREADY Although a significant subset of 0PN and 1PN zygotes can develop into balanced, diploid and developmentally competent embryos, they are usually discarded because parental diploidy detection is not part of the routine work-up of PGT-M. STUDY DESIGN, SIZE, DURATION This prospective cohort study evaluated the pronuclear number in 2229 zygotes from 2337 injected metaphase II (MII) oocytes in 268 cycles. PGT-M for 0PN and 1PN embryos developing into Day 5/6 blastocysts with adequate quality for vitrification was performed in 42 of the 268 cycles (15.7%). In these 42 cycles, we genome-wide haplotyped 216 good quality embryos corresponding to 49 0PNs, 15 1PNs and 152 2PNs. The reported outcomes include parental contribution to embryonic ploidy, embryonic aneuploidy, genetic diagnosis for the monogenic disorder, cycles reaching ETs, pregnancy and live birth rates (LBR) for unaffected offspring. PARTICIPANTS/MATERIALS, SETTING, METHODS Blastomere DNA was whole-genome amplified and hybridized on the Illumina Human CytoSNP12V2.1.1 BeadChip arrays. Subsequently, genome-wide haplotyping and copy-number profiling was applied to investigate the embryonic genome architecture. Bi-parental, unaffected embryos were transferred regardless of their initial zygotic PN score. MAIN RESULTS AND THE ROLE OF CHANCE A staggering 75.51% of 0PN and 42.86% of 1PN blastocysts are diploid bi-parental allowing accurate genetic diagnosis for the monogenic disorder. In total, 31% (13/42) of the PGT-M cycles reached ET or could repeat ET with an unaffected 0PN or 1PN embryo. The LBR per initiated cycle increased from 9.52 to 16.67%. LIMITATIONS, REASONS FOR CAUTION The clinical efficacy of the routine inclusion of 0PN and 1PN zygotes in PGT-M cycles should be confirmed in larger cohorts from multicenter studies. WIDER IMPLICATIONS OF THE FINDINGS Genome-wide haplotyping allows the inclusion of 0PN and 1PN embryos and subsequently increases the cycles reaching ET following PGT-M and potentially PGT for aneuploidy (PGT-A) and chromosomal structural rearrangements (PGT-SR). Establishing measures of clinical efficacy could lead to an update of the ESHRE guidelines which advise against the use of these zygotes. STUDY FUNDING/COMPETING INTEREST(S) SymBioSys (PFV/10/016 and C1/018 to J.R.V. and T.V.), the Horizon 2020 WIDENLIFE: 692065 to J.R.V., T.V., E.D., A.D. and M.Z.E. M.Z.E., T.V. and J.R.V. co-invented haplarithmisis (‘Haplotyping and copy-number typing using polymorphic variant allelic frequencies’), which has been licensed to Agilent Technologies. H.M. is fully supported by the (FWO) (ZKD1543-ASP/16). The authors have no competing interests to declare.
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Affiliation(s)
- Aspasia Destouni
- Laboratory for Cytogenetics and Genome Research, Center for Human Genetics, University of Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium
| | - Eftychia Dimitriadou
- Department of Human Genetics, Center for Human Genetics, University Hospitals Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium
| | - Heleen Masset
- Laboratory for Cytogenetics and Genome Research, Center for Human Genetics, University of Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium
| | - Sophie Debrock
- University Hospitals Leuven, Leuven University Fertility Center, Herestraat 49, Leuven, Belgium
| | - Cindy Melotte
- Department of Human Genetics, Center for Human Genetics, University Hospitals Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium
| | - Kris Van Den Bogaert
- Department of Human Genetics, Center for Human Genetics, University Hospitals Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium
| | - Masoud Zamani Esteki
- Department of Human Genetics, Center for Human Genetics, University Hospitals Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium.,Maastricht University Medical Center, Department of Clinical Genetics, GROW School for Oncology and Developmental Biology, Maastricht, The Netherlands
| | - Jia Ding
- Laboratory for Cytogenetics and Genome Research, Center for Human Genetics, University of Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium
| | - Thiery Voet
- Laboratory of Reproductive Genomics, Center for Human Genetics, University of Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium.,Wellcome Sanger Institute, Wellcome Genome Campus Hinxton, Cambridgeshire, UK
| | - Ellen Denayer
- Department of Human Genetics, Center for Human Genetics, University Hospitals Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium
| | - Thomy de Ravel
- Department of Human Genetics, Center for Human Genetics, University Hospitals Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium
| | - Eric Legius
- Department of Human Genetics, Center for Human Genetics, University Hospitals Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium
| | - Christel Meuleman
- University Hospitals Leuven, Leuven University Fertility Center, Herestraat 49, Leuven, Belgium
| | - Karen Peeraer
- University Hospitals Leuven, Leuven University Fertility Center, Herestraat 49, Leuven, Belgium
| | - Joris R Vermeesch
- Laboratory for Cytogenetics and Genome Research, Center for Human Genetics, University of Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium.,Department of Human Genetics, Center for Human Genetics, University Hospitals Leuven, O&N I Herestraat 49, KU Leuven, Leuven, Belgium
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18
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Laue K, Rajshekar S, Courtney AJ, Lewis ZA, Goll MG. The maternal to zygotic transition regulates genome-wide heterochromatin establishment in the zebrafish embryo. Nat Commun 2019; 10:1551. [PMID: 30948728 PMCID: PMC6449393 DOI: 10.1038/s41467-019-09582-3] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Accepted: 03/20/2019] [Indexed: 01/03/2023] Open
Abstract
The segregation of eukaryotic genomes into euchromatin and heterochromatin represents a fundamental and poorly understood process. Here, we demonstrate that genome-wide establishment of heterochromatin is triggered by the maternal to zygotic transition (MZT) during zebrafish embryogenesis. We find that prior to MZT, zebrafish lack hallmarks of heterochromatin including histone H3 lysine 9 trimethylation (H3K9me3) and condensed chromatin ultrastructure. Global establishment of heterochromatic features occurs following MZT and requires both activation of the zygotic genome and degradation of maternally deposited RNA. Mechanistically, we demonstrate that zygotic transcription of the micro RNA miR-430 promotes degradation of maternal RNA encoding the chromatin remodeling protein Smarca2, and that clearance of Smarca2 is required for global heterochromatin establishment in the early embryo. Our results identify MZT as a key developmental regulator of heterochromatin establishment during vertebrate embryogenesis and uncover functions for Smarca2 in protecting the embryonic genome against heterochromatinization. Eukaryotic genomes are segregated into euchromatin and heterochromatin. Here the authors show that heterochromatin establishment during zebrafish embryo development is controlled by zygotic transcription of miR-430 and subsequent degradation of maternal transcripts encoding the chromatin remodeling protein Smarca2.
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Affiliation(s)
- Kathrin Laue
- Department of Genetics, University of Georgia, Athens, GA, 30602, USA.,Developmental Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA
| | - Srivarsha Rajshekar
- Department of Genetics, University of Georgia, Athens, GA, 30602, USA.,Developmental Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA.,Program in Biochemistry and Structural Biology, Cell and Developmental Biology, and Molecular Biology, Weill Cornell Graduate School of Medical Sciences, Cornell University, New York, NY, 10065, USA
| | - Abigail J Courtney
- Department of Microbiology, University of Georgia, Athens, GA, 30602, USA
| | - Zachary A Lewis
- Department of Microbiology, University of Georgia, Athens, GA, 30602, USA
| | - Mary G Goll
- Developmental Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA. .,Department of Genetics, University of Georgia, Athens, GA, 30602, USA.
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The influence of clinical and laboratory factors on the formation of monopronucleated zygotes after intracytoplasmic sperm injection (ICSI). ZYGOTE 2019; 27:64-68. [DOI: 10.1017/s0967199418000473] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
SummaryThe aim of the present study was to determine whether clinical or laboratory factors can influence the development of single pronucleated zygotes (1PN) and two polar bodies (PB) after ICSI. In total, 341 ICSI cycles performed at FertiClinic-Villa Margherita from January 2012 to December 2014 were enrolled in the study. Group A included 240 cycles with no 1PN−2PB while group B included 101 cycles with one or more 1PN−2PB. Age, stimulation protocol, infertility factor, amount of gonadotropin administered, duration of therapy, peak estradiol levels, number of follicles at maturation triggering, oocytes retrieved and mature oocytes, time between retrieval and injection and sperm characteristics were compared between groups. In opposition to previous results showing no relationship between 1PN occurrence and clinical or laboratory variables, we observed that 1PN−2PB zygote formation seems to be associated with a lower female age, higher level of E2 and higher number of follicles on day of oocyte maturation triggering, higher number of astenozoospermic male patients, more oocytes retrieved at pick-up, more mature oocytes (MII) and longer time to injection.
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20
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Abstract
Epigenetic mechanisms allow the establishment and maintenance of multiple cellular phenotypes from a single genomic code. At the initiation of development, the oocyte and spermatozoa provide their fully differentiated chromatin that soon after fertilization undergo extensive remodeling, resulting in a totipotent state that can then drive cellular differentiation towards all cell types. These remodeling involves different epigenetic modifications, including DNA methylation, post-translational modifications of histones, non-coding RNAs, and large-scale chromatin conformation changes. Moreover, epigenetic remodeling is responsible for reprogramming somatic cells to totipotency upon somatic cell nuclear transfer/cloning, which is often incomplete and inefficient. Given that environmental factors, such as assisted reproductive techniques (ARTs), can affect epigenetic remodeling, there is interest in understanding the mechanisms driving these changes. We describe and discuss our current understanding of mechanisms responsible for the epigenetic remodeling that ensues during preimplantation development of mammals, presenting findings from studies of mouse embryos and when available comparing them to what is known for human and cattle embryos.
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Affiliation(s)
- Pablo J Ross
- Department of Animal Science, University of California Davis, Davis, CA, United States
| | - Rafael V Sampaio
- Department of Animal Science, University of California Davis, Davis, CA, United States.,Department of Animal Science, University of California Davis, Davis, CA, United States
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21
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Xie PY, Tang Y, Hu L, Ouyang Q, Gu YF, Gong F, Leng LZ, Zhang SP, Xiong B, Lu GX, Lin G. Identification of biparental and diploid blastocysts from monopronuclear zygotes with the use of a single-nucleotide polymorphism array. Fertil Steril 2018; 110:545-554.e5. [DOI: 10.1016/j.fertnstert.2018.04.034] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 04/06/2018] [Accepted: 04/24/2018] [Indexed: 01/09/2023]
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Assessment of developmental potential of human single pronucleated zygotes derived from conventional in vitro fertilization. J Assist Reprod Genet 2018; 35:1377-1384. [PMID: 29959619 DOI: 10.1007/s10815-018-1241-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 06/12/2018] [Indexed: 01/11/2023] Open
Abstract
PURPOSE The aim of this study was to non-invasively validate the developmental potential of human single pronucleated (1PN) zygotes derived from conventional in vitro fertilization (c-IVF) at the zygote stage. METHODS Fifty 1PN zygotes derived from 45 patients undergoing c-IVF were used. Immunohistochemistry and fluorescence live cell imaging were used to confirm normal chromosome segregation during the first mitosis. The usefulness of measuring pronuclear diameter was assessed on the basis of the presence or absence of a proper first cleavage and validated by subsequent development. RESULTS Although approximately 80% (15/19) of 1PN zygotes contained a diploid genome, immunohistochemistry revealed an unequal distribution of paternal and maternal genomes at the first mitosis. Fluorescence live imaging revealed that 73% (8/11) of 1PN zygotes formed a functional mitotic spindle at the first mitosis resulting from diploid genomes, with 25% (2/8) of these forming a tripolar spindle. 1PN zygotes in which the pronucleus disappeared and that subsequently underwent cleavage had a pronuclear diameter ≥ 32.2 μm. The selection of 1PN zygotes based on pronuclear diameter resulted in zygotes that all formed mitotic spindles with poles during cleavage. Furthermore, 63% (5/8) of these zygotes reached the blastocyst stage. CONCLUSIONS This study demonstrates the usefulness of a non-invasive assessment of 1PN zygotes derived from c-IVF as an indicator of developmental potential. Furthermore, diploid 1PN zygotes do not always exhibit normal chromosome segregation at the first mitosis. A pronuclear diameter ≥ 32.2 μm just before PN breakdown might be a useful criterion to assess 1PN zygotes that are capable of further development.
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Araki E, Itoi F, Honnma H, Asano Y, Oguri H, Nishikawa K. Correlation between the pronucleus size and the potential for human single pronucleus zygotes to develop into blastocysts : 1PN zygotes with large pronuclei can expect an embryo development to the blastocyst stage that is similar to the development of 2PN zygotes. J Assist Reprod Genet 2018; 35:817-823. [PMID: 29479641 DOI: 10.1007/s10815-018-1137-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 02/08/2018] [Indexed: 10/17/2022] Open
Abstract
PURPOSE In this study, we examined the correlation between pronucleus size and the potential for human single pronucleus (1PN) zygotes to develop into blastocysts after IVF and ICSI. METHODS This study included 112 patients who underwent a total of 112 cycles of IVF/ICSI. To evaluate embryo development, 1PN zygotes were compared with 2PN zygotes in the same IVF/ICSI cycle (control cycles) using time-lapse live embryo imaging. To assess the potential for blastocyst formation, cutoff values for pronuclear area and diameter were established through receiver operating characteristic curve analysis, after which 1PN zygotes were classified based on those cutoff values. RESULTS Among 1PN zygotes cultured to day 5/6, the rate of embryo development was significantly lower than from 2PN zygotes. However, the rates of blastocyst formation and good quality blastocysts from 1PN zygotes with large pronuclear areas (≥ 710 μm2) or diameters (≥ 31 μm) were significantly higher than from 1PN zygotes with smaller pronuclear areas (≤ 509, 510-609, and 610-709 μm2) or diameters (≤ 24, 25-27,and 28-30 μm) (P < 0.01). Moreover, the results for 1PN zygotes with large pronuclei were similar to those for 2PN zygotes. CONCLUSIONS The developmental potential of 1PN zygotes with large pronuclear areas (≥ 710 μm2) or diameters (31 μm) appears to be similar to that of 2PN zygotes, and measurement of pronuclear area or diameter in 1PN zygotes is a simple, potentially useful, clinical method.
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Affiliation(s)
- Eri Araki
- Department of Infertility, Green Bell Clinic, Kitamachi 2-160, Toyota, Aichi, 471-0027, Japan
| | - Fumiaki Itoi
- Department of Infertility, Green Bell Clinic, Kitamachi 2-160, Toyota, Aichi, 471-0027, Japan.
| | - Hiroyuki Honnma
- Sapporo ART Clinic, Kita7jonishi 4-1-2, Kita-ku, Sapporo, Hokkaido, 060-0807, Japan
| | - Yukiko Asano
- Department of Infertility, Royal Bell Clinic, Midori-ku, Nagoya, Aichi, 458-0801, Japan
| | - Hisanori Oguri
- Department of Infertility, Royal Bell Clinic, Midori-ku, Nagoya, Aichi, 458-0801, Japan
| | - Kazuyo Nishikawa
- Department of Infertility, Green Bell Clinic, Kitamachi 2-160, Toyota, Aichi, 471-0027, Japan
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Mateo S, Vidal F, Coll L, Veiga A, Boada M. Chromosomal analysis of blastocyst derived from monopronucleated ICSI zygotes: approach by double trophectoderm biopsy. JBRA Assist Reprod 2017; 21:203-207. [PMID: 28837028 PMCID: PMC5574641 DOI: 10.5935/1518-0557.20170039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Objective This study aims to increase the knowledge about monopronucleated ICSI-derived
blastocysts, analyzing trophectoderm biopsies by aCGH and FISH to evaluate
their chromosome constitution. Methods Fifteen monopronucleated ICSI-derived blastocysts were studied. Double
trophectoderm biopsy was performed and analyzed by FISH and aCGH. The
blastocysts were classified according to chromosome constitution.
Disagreements between the two techniques were assessed. Results Results obtained after FISH and aCGH analyses showed the following: 20%
(3/15) and 60% (9/15) diploid females, respectively; 26.7% (4/15) and 26.7%
(4/15) diploid males, respectively; and 53.3% (8/15) and 13.3% (2/15)
mosaics, respectively. No mosaic male embryos were found using FISH or aCGH.
There were disagreements in 40% (6/15) of the cases due to the higher
detection of mosaicism by FISH compared to aCGH. Conclusions The combination of FISH and aCGH has been shown to be a suitable approach to
increase the knowledge about monopronucleated ICSI-derived embryos. FISH
analysis of blastocysts derived from monopronucleated ICSI zygotes enabled
us to conclude that aCGH underestimates haploidy. Some diploid embryos
diagnosed by aCGH are in fact mosaic. In cases where these embryos would be
used for reproductive purposes, extra analysis of parental genome origin is
recommended.
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Affiliation(s)
- Silvia Mateo
- Reproductive Medicine Service, Department of Obstetrics, Gynaecology and Reproduction, Women's Health Dexeus, Barcelona, Spain
| | - Francesca Vidal
- Cell Biology Unit, Faculty of Biosciences, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Lluc Coll
- Reproductive Medicine Service, Department of Obstetrics, Gynaecology and Reproduction, Women's Health Dexeus, Barcelona, Spain
| | - Anna Veiga
- Reproductive Medicine Service, Department of Obstetrics, Gynaecology and Reproduction, Women's Health Dexeus, Barcelona, Spain.,Stem Cell Bank, Centre for Regenerative Medicine, Barcelona, Spain
| | - Montserrat Boada
- Reproductive Medicine Service, Department of Obstetrics, Gynaecology and Reproduction, Women's Health Dexeus, Barcelona, Spain
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Bradley CK, Traversa MV, Hobson N, Gee AJ, McArthur SJ. Clinical use of monopronucleated zygotes following blastocyst culture and preimplantation genetic screening, including verification of biparental chromosome inheritance. Reprod Biomed Online 2017; 34:567-574. [DOI: 10.1016/j.rbmo.2017.03.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 03/11/2017] [Accepted: 03/14/2017] [Indexed: 10/19/2022]
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Could monopronucleated ICSI zygotes be considered for transfer? Analysis through time-lapse monitoring and PGS. J Assist Reprod Genet 2017; 34:905-911. [PMID: 28497410 DOI: 10.1007/s10815-017-0937-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 04/26/2017] [Indexed: 10/19/2022] Open
Abstract
PURPOSE The purpose of this study was to investigate the chromosomal constitution and the developmental potential of intracytoplasmic sperm injection (ICSI) deriving embryos displaying a single pronucleus at the zygote stage. METHODS Eighty-eight embryos from single pronucleus (1PN) two polar bodies (2PB) ICSI zygotes from 64 preimplantational genetic screening (PGS) cycles (October 2012-December 2014), were retrospectively analyzed. Zygotes were cultured in a time-lapse incubator. Embryo biopsy was performed on day 3 and genetic analysis approached by array comparative genomic hybridization. RESULTS Chromosomal analysis revealed that 17% (15/88) of embryos derived from 1PN 2PB zygotes were diagnosed as euploid. After blastomere biopsy at day 3, the blastocyst rate at day 5 was 3.4% (3/88). Only 2.3% (2/88) euploid blastocysts were obtained. In two couples and after counseling and patient agreement, the transfer of a euploid blastocyst from a 1PN 2PB ICSI zygote was performed resulting in the birth of a healthy child. CONCLUSIONS These results open the possibility to consider embryos coming from 1PN 2PB ICSI zygotes for transfer when no other embryos from 2PN 2PB ICSI zygotes are available and if a PGS diagnosis of euploidy is obtained. Confirmation of biparental inheritance is strongly recommended.
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Destouni A, Vermeesch JR. How can zygotes segregate entire parental genomes into distinct blastomeres? The zygote metaphase revisited. Bioessays 2017; 39. [DOI: 10.1002/bies.201600226] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Aspasia Destouni
- Laboratory of Cytogenetics and Genome Research; Center of Human Genetics; KU Leuven; Leuven Belgium
| | - Joris R. Vermeesch
- Laboratory of Cytogenetics and Genome Research; Center of Human Genetics; KU Leuven; Leuven Belgium
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28
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Motheo TF, Arnold DR, Padilha-Nakaghi LC, Pires-Buttler EA, Alves AE, Apparicio M, Vicente WRR, Lopes FL. Changes in acetylation of lysine 5 on histone H4 in canine oocytes following in vitro maturation. Reprod Domest Anim 2016; 52 Suppl 2:103-107. [DOI: 10.1111/rda.12897] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- TF Motheo
- Department of Animal Reproduction; Faculdade de Ciencias Agrarias e Veterinarias Campus de Jaboticabal; Universidade Estadual Paulista Julio de Mesquita Filho; Jaboticabal Brazil
| | - DR Arnold
- In vitro Brasil S/A; Mogi Mirim Brazil
| | - LC Padilha-Nakaghi
- Department of Animal Reproduction; Faculdade de Ciencias Agrarias e Veterinarias Campus de Jaboticabal; Universidade Estadual Paulista Julio de Mesquita Filho; Jaboticabal Brazil
| | - EA Pires-Buttler
- Department of Animal Reproduction; Faculdade de Ciencias Agrarias e Veterinarias Campus de Jaboticabal; Universidade Estadual Paulista Julio de Mesquita Filho; Jaboticabal Brazil
| | - AE Alves
- Universidade Federal de Uberlandia - Campus Umuarama; Uberlandia Brazil
| | - M Apparicio
- Programa de Mestrado em Ciência Animal; Universidade de Franca; Franca Brazil
| | - WRR Vicente
- Department of Animal Reproduction; Faculdade de Ciencias Agrarias e Veterinarias Campus de Jaboticabal; Universidade Estadual Paulista Julio de Mesquita Filho; Jaboticabal Brazil
| | - FL Lopes
- Department of Support, Production and Animal Health; Faculdade de Medicina Veterinária de Araçatuba - FMVA/UNESP; Universidade Estadual Júlio de Mesquita Filho; Araçatuba Brazil
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Determination of the parental pronuclear origin in bovine zygotes: H3K9me3 versus H3K27me2-3. Anal Biochem 2016; 510:76-78. [PMID: 27443957 DOI: 10.1016/j.ab.2016.07.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Revised: 07/04/2016] [Accepted: 07/18/2016] [Indexed: 11/22/2022]
Abstract
To study the dynamics of 5-methylcytosine and 5-hydroxymethylcytosine in zygotes, the parental origin of the pronuclei needs to be determined. To this end the use of the asymmetric distribution of histone modifications in pronuclei is becoming more popular. Here, we demonstrated that histone 3 lysine 27 di-tri-methylation shows a stable pattern being present in the maternal but not in the paternal pronucleus of bovine zygotes, even in late stages of pronuclear development. In contrast, the pattern of histone 3 lysine 9 tri-methylation is very variable, and therefore cannot be used to reliably determine the parental origin of bovine pronuclei.
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Demyda-Peyrás S, Dorado J, Hidalgo M, Moreno-Millán M. Influence of sperm fertilising concentration, sperm selection method and sperm capacitation procedure on the incidence of numerical chromosomal abnormalities in IVF early bovine embryos. Reprod Fertil Dev 2015; 27:351-9. [PMID: 24725304 DOI: 10.1071/rd13285] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Accepted: 10/21/2013] [Indexed: 01/01/2023] Open
Abstract
The occurrence of numerical chromosomal aberrations, widely described as a major cause of mortality in in vitro-produced (IVP) embryos, has been linked to several factors. In the present study we investigated the effect of sperm fertilising concentration and semen handling (sperm selection and capacitation) before IVF on the rate of numerical chromosomal abnormalities in bovine embryos. In all, 466 IVP cattle embryos were karyotyped throughout three sequential experiments, analysing the effects of sperm fertilising concentration (0.1, 1.0 or 10×10(6) spermatozoa mL(-1)), selection method (unselected or Percoll-selected spermatozoa) and capacitation medium (bovine serum albumin (BSA), heparin or their combination). The percentage of normal (diploid) and aberrant (haploid, polyploid or aneuploid) embryos was noted in each experiment. The rate of numerical chromosomal abnormalities was mainly affected by sperm fertilising concentration (P<0.01) and, to a lesser extent, by the sperm capacitation medium (P<0.05). Polyploidy and haploidy rates were only affected by sperm fertilising concentration (P<0.05). Interestingly, the sperm selection technique used in the present study did not reduce the incidence of chromosome abnormalities in IVP cattle embryos (P>0.05). Finally, aneuploidy rates were not affected during the experiments (P>0.05), which suggests that they are not related to sperm-related factors. On the basis of these results, we conclude that sperm fertilising concentration is the 'paternal' key factor that affects the rate of numerical chromosomal abnormalities in IVP bovine embryos. By making small adjustments to fertilising protocols, the rate of cytogenetically aberrant embryos can be markedly reduced.
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Affiliation(s)
| | - Jesús Dorado
- Department of Medicine and Animal Surgery, University of Cordoba, Spain
| | - Manuel Hidalgo
- Department of Medicine and Animal Surgery, University of Cordoba, Spain
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Rahman MM, Munzig M, Kaneshiro K, Lee B, Strome S, Müller-Reichert T, Cohen-Fix O. Caenorhabditis elegans polo-like kinase PLK-1 is required for merging parental genomes into a single nucleus. Mol Biol Cell 2015; 26:4718-35. [PMID: 26490119 PMCID: PMC4678026 DOI: 10.1091/mbc.e15-04-0244] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 10/13/2015] [Indexed: 11/11/2022] Open
Abstract
Before the first zygotic division, the nuclear envelopes of the maternal and paternal pronuclei disassemble, allowing both sets of chromosomes to be incorporated into a single nucleus in daughter cells after mitosis. We found that in Caenorhabditis elegans, partial inactivation of the polo-like kinase PLK-1 causes the formation of two nuclei, containing either the maternal or paternal chromosomes, in each daughter cell. These two nuclei gave rise to paired nuclei in all subsequent cell divisions. The paired-nuclei phenotype was caused by a defect in forming a gap in the nuclear envelopes at the interface between the two pronuclei during the first mitotic division. This was accompanied by defects in chromosome congression and alignment of the maternal and paternal metaphase plates relative to each other. Perturbing chromosome congression by other means also resulted in failure to disassemble the nuclear envelope between the two pronuclei. Our data further show that PLK-1 is needed for nuclear envelope breakdown during early embryogenesis. We propose that during the first zygotic division, PLK-1-dependent chromosome congression and metaphase plate alignment are necessary for the disassembly of the nuclear envelope between the two pronuclei, ultimately allowing intermingling of the maternal and paternal chromosomes.
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Affiliation(s)
- Mohammad M Rahman
- Laboratory of Cell and Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Mandy Munzig
- Structural Cell Biology Group, Experimental Center, Medical Faculty Carl Gustav Carus, University of Technology Dresden, 01307 Dresden, Germany
| | - Kiyomi Kaneshiro
- Department of Molecular, Cell and Developmental Biology, University of California, Santa Cruz, Santa Cruz, CA 95064
| | - Brandon Lee
- Laboratory of Cell and Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Susan Strome
- Department of Molecular, Cell and Developmental Biology, University of California, Santa Cruz, Santa Cruz, CA 95064
| | - Thomas Müller-Reichert
- Structural Cell Biology Group, Experimental Center, Medical Faculty Carl Gustav Carus, University of Technology Dresden, 01307 Dresden, Germany
| | - Orna Cohen-Fix
- Laboratory of Cell and Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892
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van de Werken C, Avo Santos M, Laven J, Eleveld C, Fauser B, Lens S, Baart E. Chromosome segregation regulation in human zygotes: altered mitotic histone phosphorylation dynamics underlying centromeric targeting of the chromosomal passenger complex. Hum Reprod 2015. [DOI: 10.1093/humrep/dev186] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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33
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Birth of nine normal healthy babies following transfer of blastocysts derived from human single-pronucleate zygotes. J Assist Reprod Genet 2015; 32:1401-7. [PMID: 26111861 DOI: 10.1007/s10815-015-0518-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 06/15/2015] [Indexed: 10/23/2022] Open
Abstract
PURPOSE The purpose of this study is to examine the clinical outcomes of blastocysts derived from human single-pronucleate (1PN) embryos after conventional in vitro fertilization (cIVF) and intracytoplasmic sperm injection (ICSI) cycles. METHODS This was a retrospective study at a reproductive center of a hospital. To evaluate embryo quality and clinical outcomes, cIVF or ICSI cycles with one or more 1PN embryos were compared with same cycles with 2PN embryos (control cycles). RESULTS A total of 623 cycles (426 cIVF cycles and 197 ICSI cycles) were treated with cIVF or ICSI. The single pronuclear status rate was similar between cIVF (22.1 %) and ICSI (25.1 %) cycles. Although the development rates of 1PN embryos on day 3 and day 5/6 in cIVF were significantly higher than those in ICSI, those of 1PN embryos in cIVF were significantly lower compared to 2PN embryos (p < 0.01). Nonetheless, the ongoing pregnancy rates achieved with 1PN blastocysts in 1PN embryos did not significantly differ from the control group. Thirty-three transfer cycles with 33 blastocysts derived from 1PN embryos in cIVF resulted in nine deliveries with no newborn malformations; however, no implantation was observed in three ICSI cycles. CONCLUSION Although the blastocyst formation rate of 1PN embryos was significantly lower than 2PN embryos in cIVF and ICSI cycles, 1PN blastocysts in cIVF, and not from ICSI, demonstrated an adequate ongoing pregnancy rate. These results suggested that 1PN blastocysts in cIVF are available for clinical use and may lead to an increase in the chance of pregnancy in patients receiving assisted reproductive technology with 1PN embryos.
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Vieweg M, Dvorakova-Hortova K, Dudkova B, Waliszewski P, Otte M, Oels B, Hajimohammad A, Turley H, Schorsch M, Schuppe HC, Weidner W, Steger K, Paradowska-Dogan A. Methylation analysis of histone H4K12ac-associated promoters in sperm of healthy donors and subfertile patients. Clin Epigenetics 2015; 7:31. [PMID: 25806092 PMCID: PMC4372182 DOI: 10.1186/s13148-015-0058-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 02/12/2015] [Indexed: 11/24/2022] Open
Abstract
Background Histone to protamine exchange and the hyperacetylation of the remaining histones are hallmarks of spermiogenesis. Acetylation of histone H4 at lysine 12 (H4K12ac) was observed prior to full decondensation of sperm chromatin after fertilization suggesting an important role for the regulation of gene expression in early embryogenesis. Similarly, DNA methylation may contribute to gene silencing of several developmentally important genes. Following the identification of H4K12ac-binding promoters in sperm of fertile and subfertile patients, we aimed to investigate whether the depletion of histone-binding is associated with aberrant DNA methylation in sperm of subfertile men. Furthermore, we monitored the transmission of H4K12ac, 5-methylcytosine (5mC) and 5-hydroxymethylcytosine (5hmC) from the paternal chromatin to the embryo applying mouse in vitro fertilization and immunofluorescence. Results Chromatin immunoprecipitation (ChIP) with anti-H4K12ac antibody was performed with chromatin isolated from spermatozoa of subfertile patients with impaired sperm chromatin condensation assessed by aniline blue staining. Fertile donors were used as control. DNA methylation analysis of selected H4K12ac-interacting promoters in spermatozoa was performed by pyrosequencing. Depletion of binding sites for H4K12ac was observed within the following developmentally important promoters: AFF4, EP300, LRP5, RUVBL1, USP9X, NCOA6, NSD1, and POU2F1. We found 5% to 10% hypomethylation within CpG islands of selected promoters in the sperm of fertile donors, and it was not significantly altered in the subfertile group. Our results demonstrate that the H4K12ac depletion in selected developmentally important promoters of subfertile patients was not accompanied by a change of DNA methylation. Using a murine model, immunofluorescence revealed that H4K12ac co-localize with 5mC in the sperm nucleus. During fertilization, when the pronuclei are formed, the paternal pronucleus exhibits a strong acetylation signal on H4K12, while in the maternal pronucleus, there is a permanent increase of H4K12ac until pronuclei fusion. Simultaneously, there is an increase of the 5hmC signal and a decrease of the 5mC signal. Conclusions We suggest that aberrant histone acetylation within developmentally important gene promoters in subfertile men, but not DNA methylation, may reflect insufficient sperm chromatin compaction affecting the transfer of epigenetic marks to the oocyte. Electronic supplementary material The online version of this article (doi:10.1186/s13148-015-0058-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Markus Vieweg
- Section Molecular Andrology, Biomedical Research Center Seltersberg, Justus Liebig University of Giessen, 35392 Giessen, Germany
| | - Katerina Dvorakova-Hortova
- Laboratory of Reproductive Biology, Institute of Biotechnology AS CR, v.v.i., Videnska 1083, 14220 Prague 4, Czech Republic.,Biocev Group, Department of Zoology, Faculty of Science, Charles University in Prague, 12844 Prague, Czech Republic
| | - Barbora Dudkova
- Biocev Group, Department of Zoology, Faculty of Science, Charles University in Prague, 12844 Prague, Czech Republic
| | - Przemyslaw Waliszewski
- Department of Urology, Pediatric Urology and Andrology, Justus Liebieg University of Giessen, 35392 Giessen, Germany
| | - Marie Otte
- Fertility Center, 35578 Wetzlar, Germany
| | | | | | | | | | - Hans-Christian Schuppe
- Department of Urology, Pediatric Urology and Andrology, Justus Liebieg University of Giessen, 35392 Giessen, Germany
| | - Wolfgang Weidner
- Department of Urology, Pediatric Urology and Andrology, Justus Liebieg University of Giessen, 35392 Giessen, Germany
| | - Klaus Steger
- Section Molecular Andrology, Biomedical Research Center Seltersberg, Justus Liebig University of Giessen, 35392 Giessen, Germany
| | - Agnieszka Paradowska-Dogan
- Section Molecular Andrology, Biomedical Research Center Seltersberg, Justus Liebig University of Giessen, 35392 Giessen, Germany
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35
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Heras S, Smits K, Leemans B, Van Soom A. Asymmetric histone 3 methylation pattern between paternal and maternal pronuclei in equine zygotes. Anal Biochem 2015; 471:67-9. [DOI: 10.1016/j.ab.2014.11.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 11/07/2014] [Accepted: 11/10/2014] [Indexed: 10/24/2022]
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Histone Variants and Reprogramming in Early Development. EPIGENETIC MECHANISMS IN CELLULAR REPROGRAMMING 2015. [DOI: 10.1007/978-3-642-31974-7_3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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37
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Paternal heterochromatin formation in human embryos is H3K9/HP1 directed and primed by sperm-derived histone modifications. Nat Commun 2014; 5:5868. [PMID: 25519718 PMCID: PMC4284653 DOI: 10.1038/ncomms6868] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Accepted: 11/14/2014] [Indexed: 12/22/2022] Open
Abstract
The different configurations of maternal and paternal chromatin, acquired during oogenesis and spermatogenesis, have to be rearranged after fertilization to form a functional embryonic genome. In the paternal genome, nucleosomal chromatin domains are re-established after the protamine-to-histone exchange. We investigated the formation of constitutive heterochromatin (cHC) in human preimplantation embryos. Our results show that histones carrying canonical cHC modifications are retained in cHC regions of sperm chromatin. These modified histones are transmitted to the oocyte and contribute to the formation of paternal embryonic cHC. Subsequently, the modifications are recognized by the H3K9/HP1 pathway maternal chromatin modifiers and propagated over the embryonic cleavage divisions. These results are in contrast to what has been described for mouse embryos, in which paternal cHC lacks canonical modifications and is initially established by Polycomb group proteins. Our results show intergenerational epigenetic inheritance of the cHC structure in human embryos.
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38
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Guo H, Zhu P, Yan L, Li R, Hu B, Lian Y, Yan J, Ren X, Lin S, Li J, Jin X, Shi X, Liu P, Wang X, Wang W, Wei Y, Li X, Guo F, Wu X, Fan X, Yong J, Wen L, Xie SX, Tang F, Qiao J. The DNA methylation landscape of human early embryos. Nature 2014; 511:606-10. [PMID: 25079557 DOI: 10.1038/nature13544] [Citation(s) in RCA: 645] [Impact Index Per Article: 64.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Accepted: 05/30/2014] [Indexed: 12/23/2022]
Abstract
DNA methylation is a crucial element in the epigenetic regulation of mammalian embryonic development. However, its dynamic patterns have not been analysed at the genome scale in human pre-implantation embryos due to technical difficulties and the scarcity of required materials. Here we systematically profile the methylome of human early embryos from the zygotic stage through to post-implantation by reduced representation bisulphite sequencing and whole-genome bisulphite sequencing. We show that the major wave of genome-wide demethylation is complete at the 2-cell stage, contrary to previous observations in mice. Moreover, the demethylation of the paternal genome is much faster than that of the maternal genome, and by the end of the zygotic stage the genome-wide methylation level in male pronuclei is already lower than that in female pronuclei. The inverse correlation between promoter methylation and gene expression gradually strengthens during early embryonic development, reaching its peak at the post-implantation stage. Furthermore, we show that active genes, with the trimethylation of histone H3 at lysine 4 (H3K4me3) mark at the promoter regions in pluripotent human embryonic stem cells, are essentially devoid of DNA methylation in both mature gametes and throughout pre-implantation development. Finally, we also show that long interspersed nuclear elements or short interspersed nuclear elements that are evolutionarily young are demethylated to a milder extent compared to older elements in the same family and have higher abundance of transcripts, indicating that early embryos tend to retain higher residual methylation at the evolutionarily younger and more active transposable elements. Our work provides insights into the critical features of the methylome of human early embryos, as well as its functional relation to the regulation of gene expression and the repression of transposable elements.
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Affiliation(s)
- Hongshan Guo
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2]
| | - Ping Zhu
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China [3]
| | - Liying Yan
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, China [3]
| | - Rong Li
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, China [3]
| | - Boqiang Hu
- Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China
| | - Ying Lian
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, China
| | - Jie Yan
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, China
| | - Xiulian Ren
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, China
| | - Shengli Lin
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, China
| | - Junsheng Li
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, China
| | - Xiaohu Jin
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, China
| | - Xiaodan Shi
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, China
| | - Ping Liu
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, China
| | - Xiaoye Wang
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
| | - Wei Wang
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
| | - Yuan Wei
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
| | - Xianlong Li
- Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China
| | - Fan Guo
- Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China
| | - Xinglong Wu
- Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China
| | - Xiaoying Fan
- Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China
| | - Jun Yong
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Lu Wen
- Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China
| | - Sunney X Xie
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Fuchou Tang
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Ministry of Education Key Laboratory of Cell Proliferation and Differentiation, Beijing 100871, China
| | - Jie Qiao
- 1] Biodynamic Optical Imaging Center &Center for Reproductive Medicine, College of Life Sciences, Third Hospital, Peking University, Beijing 100871, China [2] Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing 100191, China
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The chromosomal constitution of embryos arising from monopronuclear oocytes in programmes of assisted reproduction. Int J Reprod Med 2014; 2014:418198. [PMID: 25763399 PMCID: PMC4334058 DOI: 10.1155/2014/418198] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 04/09/2014] [Indexed: 11/18/2022] Open
Abstract
The assessment of oocytes showing only one pronucleus during assisted reproduction is associated with uncertainty. A compilation of data on the genetic constitution of different developmental stages shows that affected oocytes are able to develop into haploid, diploid, and mosaic embryos with more or less complex chromosomal compositions. In the majority of cases (~80%), haploidy appears to be caused by gynogenesis, whereas parthenogenesis or androgenesis is less common. Most of the diploid embryos result from a fertilization event involving asynchronous formation of the two pronuclei or pronuclear fusion at a very early stage. Uniparental diploidy may sometimes occur if one pronucleus fails to develop and the other pronucleus already contains a diploid genome or alternatively a haploid genome undergoes endoreduplication. In general, the chance of obtaining a biparental diploid embryo appears higher after conventional in vitro fertilization than after intracytoplasmic sperm injection. If a transfer of embryos obtained from monopronuclear oocytes is envisaged, it should be tried to culture them up to the blastocyst since most haploid embryos are not able to reach this stage. Comprehensive counselling of patients on potential risks is advisable before transfer and a preimplantation genetic diagnosis could be offered if available.
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Azevedo AR, Pinho MJ, Silva J, Sá R, Thorsteinsdóttir S, Barros A, Sousa M. Molecular cytogenetics of human single pronucleated zygotes. Reprod Sci 2014; 21:1472-82. [PMID: 24717739 DOI: 10.1177/1933719114530185] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The aim of the present study was to use fluorescence in situ hybridization to analyze the chromosome status of zygotes with a single pronucleus from in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI) treatment cycles. In addition, we performed immunocytochemical detection of nuclear lamins and histone H3 trimethylated at lysine-9, Me(3)H3K9. Zygotes were processed 24 hours after insemination or injection to assure the absence of asynchrony. In opposition to previous results, we observed 2 pronuclei in 16 of 18 IVF zygotes and 40 of 64 ICSI zygotes, suggesting premature pronuclear breakdown. In IVF and ICSI zygotes, the rate of normal diploidy was only 6 of 16 and 27 of 56, respectively, suggesting that monopronucleated zygotes should not be used in assisted reproductive treatments. The possible mechanisms are discussed and compared to previous studies of monopronucleated zygotes.
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Affiliation(s)
- Ana Raquel Azevedo
- Department of Microscopy, Laboratory of Cell Biology, Multidisciplinary Unit for Biomedical Research-UMIB, Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Rua Jorge Viterbo Ferreira, Porto, Portugal
| | - Maria João Pinho
- Department of Genetics, Faculty of Medicine, University of Porto (FMUP), Porto, Portugal
| | | | - Rosália Sá
- Department of Microscopy, Laboratory of Cell Biology, Multidisciplinary Unit for Biomedical Research-UMIB, Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Rua Jorge Viterbo Ferreira, Porto, Portugal
| | - Sólveig Thorsteinsdóttir
- Department of Animal Biology, Faculty of Sciences, Centre for Environmental Biology, University of Lisbon, Lisbon, Portugal Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | - Alberto Barros
- Department of Genetics, Faculty of Medicine, University of Porto (FMUP), Porto, Portugal Centre for Reproductive Genetics, Porto, Portugal
| | - Mário Sousa
- Department of Microscopy, Laboratory of Cell Biology, Multidisciplinary Unit for Biomedical Research-UMIB, Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Rua Jorge Viterbo Ferreira, Porto, Portugal
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41
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Zhang H, Xiao Y, Wang X, Riaz H, Li W, Fu S, Xin Y, Shi L, Ma F, Li X, Yang L. Effects of histone deacetylase inhibitors on the early development of bovine androgenetic embryos. Cell Reprogram 2014; 16:54-64. [PMID: 24387164 DOI: 10.1089/cell.2013.0027] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Histone acetylation is one of the most important posttranslational modifications that contribute to transcriptional initiation and chromatin remodeling. In our previous study, we enhanced sperm chromatin remodeling within the bovine sperm injection-derived androgenentic (SpI-AG) embryos by sperm pretreatment, and thereby improved their early developmental competence. In this study, we found that blastocyst development of SpI-AG embryos could be elevated by the histone deacetylase inhibitor (HDACi). First, we optimized the efficacy of two histone deacetylase inhibitors [trichostatin A (TSA) and Scriptaid (SCR)] in a dose (0, 5, 10, 20, 50, and 100 nM for TSA; 0, 50, 100, 200, 300, and 500 nM for SCR, respectively) and time-dependent (0, 10, 15, 20, and 25 h) manner on the developmental capacity of these embryos. Furthermore, we quantitatively assessed the alterations in histone H3 and H4 overall acetylation levels and blastocyst quality of SpI-AG embryos by immunofluorescence staining. We found a significantly improved morula and blastocyst development rate of SpI-AG embryos at a mild dose of TSA (20 nM) or SCR (200 nM) for 15 h after embryo activation. Furthermore, both HDACi noticeably increased the levels of acetylated histone H3 and H4 in SpI-AG blastocyst embryos, whereas, SCR treatment improved the quality of blastocysts when compared with control group. In conclusion, HDACi is beneficial for early development of bovine SpI-AG embryos and can be used to improve the efficiency of its in vitro production.
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Affiliation(s)
- Hualin Zhang
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, College of Animal Science and Technology, Huazhong Agricultural University , Wuhan, 430070, P.R. China
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42
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Bošković A, Bender A, Gall L, Ziegler-Birling C, Beaujean N, Torres-Padilla ME. Analysis of active chromatin modifications in early mammalian embryos reveals uncoupling of H2A.Z acetylation and H3K36 trimethylation from embryonic genome activation. Epigenetics 2012; 7:747-57. [PMID: 22647320 DOI: 10.4161/epi.20584] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Early embryonic development is characterized by dramatic changes in cell potency and chromatin organization. The role of histone variants in the context of chromatin remodeling during embryogenesis remains under investigated. In particular, the nuclear distribution of the histone variant H2A.Z and its modifications have not been examined. Here we investigated the dynamics of acetylation of H2A.Z and two other active chromatin marks, H3K9ac and H3K36me3, throughout murine and bovine pre-implantation development. We show that H2A.Z distribution is dynamic during the earliest stages of mouse development, with protein levels significantly varying across stages and lowest at the 2-cell stage. When present, H2A.Z localizes preferentially to euchromatin at all stages analyzed. H2A.Z is acetylated in pre-implantation blastomeres and is preferentially localized to euchromatin, in line with the known role of H2A.Zac in transcriptional activation. Interestingly, however, H2A.Zac is undetectable in mouse embryos at the 2-cell stage, the time of major embryonic genome activation (EGA). Similarly, H3K36me3 is present exclusively in the maternal chromatin immediately after fertilization but becomes undetectable in interphase nuclei at the 2-cell stage, suggesting uncoupling of these active marks with global embryonic transcription activation. In bovine embryos, which undergo EGA at the 8-cell stage, H2A.Zac can be detected in zygotes, 4-, 8- and 16-cell stage embryos as well as in blastocysts, indicating that the dynamics of H2A.Zac is not conserved in mammals. In contrast, H3K36me3 displays mostly undetectable and heterogeneous localization pattern throughout bovine pre-implantation development. Thus, our results suggest that 'canonical' active chromatin marks exhibit a dynamic behavior in embryonic nuclei, which is both stage- and species-specific. We hypothesize that chromatin of early embryonic nuclei is subject to fine-tuning through differential acquisition of histone marks, allowing for proper chromatin remodeling and developmental progression in a species-specific fashion.
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Affiliation(s)
- Ana Bošković
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM U964, Strasbourg, France
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van Montfoort APA, Hanssen LLP, de Sutter P, Viville S, Geraedts JPM, de Boer P. Assisted reproduction treatment and epigenetic inheritance. Hum Reprod Update 2012; 18:171-97. [PMID: 22267841 PMCID: PMC3282574 DOI: 10.1093/humupd/dmr047] [Citation(s) in RCA: 140] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND The subject of epigenetic risk of assisted reproduction treatment (ART), initiated by reports on an increase of children with the Beckwith–Wiedemann imprinting disorder, is very topical. Hence, there is a growing literature, including mouse studies. METHODS In order to gain information on transgenerational epigenetic inheritance and epigenetic effects induced by ART, literature databases were searched for papers on this topic using relevant keywords. RESULTS At the level of genomic imprinting involving CpG methylation, ART-induced epigenetic defects are convincingly observed in mice, especially for placenta, and seem more frequent than in humans. Data generally provide a warning as to the use of ovulation induction and in vitro culture. In human sperm from compromised spermatogenesis, sequence-specific DNA hypomethylation is observed repeatedly. Transmittance of sperm and oocyte DNA methylation defects is possible but, as deduced from the limited data available, largely prevented by selection of gametes for ART and/or non-viability of the resulting embryos. Some evidence indicates that subfertility itself is a risk factor for imprinting diseases. As in mouse, physiological effects from ART are observed in humans. In the human, indications for a broader target for changes in CpG methylation than imprinted DNA sequences alone have been found. In the mouse, a broader range of CpG sequences has not yet been studied. Also, a multigeneration study of systematic ART on epigenetic parameters is lacking. CONCLUSIONS The field of epigenetic inheritance within the lifespan of an individual and between generations (via mitosis and meiosis, respectively) is growing, driven by the expansion of chromatin research. ART can induce epigenetic variation that might be transmitted to the next generation.
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Affiliation(s)
- A P A van Montfoort
- Department of Obstetrics & Gynaecology, GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, The Netherlands.
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Franciosi F, Lodde V, Goudet G, Duchamp G, Deleuze S, Douet C, Tessaro I, Luciano AM. Changes in histone H4 acetylation during in vivo versus in vitro maturation of equine oocytes. Mol Hum Reprod 2011; 18:243-52. [PMID: 22155671 DOI: 10.1093/molehr/gar077] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Epigenetic modifications are established during gametogenesis and preimplantation embryonic development. Any disturbance of the normal natural environment during these critical phases could cause alterations of the epigenetic signature. Histone acetylation is an important epigenetic modification involved in the regulation of chromatin organization and gene expression. The present study was aimed to determine whether the proper establishment of post-translational histone H4 acetylation at lysine 8 (AcH4K8), 12 (AcH4K12) and 16 (AcH4K16) of equine oocytes is adversely affected during in vitro maturation (IVM) when compared with in vivo matured oocytes collected from naturally cycling mares not undergoing ovarian hyperstimulation. The acetylation patterns were investigated by means of indirect immunofluorescence staining with specific antibodies directed against the acetylated lysine residues. Our results indicate that the acetylation state of H4 is dependent on the chromatin configuration in immature germinal vesicle (GV) stage oocytes and it changes in a residue-specific manner along with the increase of chromatin condensation. In particular, the levels of AcH4K8 and AcH4K12 increased significantly, while AcH4K16 decreased significantly from the fibrillar to the condensed state of chromatin configuration within the GV. Moreover, during meiosis, K8 and K12 were substantially deacetylated without any differences between in vivo and in vitro conditions, while K16 displayed a strong acetylation in oocytes matured in vivo, and in contrast, it was markedly deacetylated following IVM. Although the functional meaning of residue-specific acetylation during oocyte differentiation and meiotic resumption needs further investigation, our results support the hypothesis that IVM conditions can adversely affect oocyte ability to regulate the epigenetic reprogramming, critical for successful meiosis and subsequent embryonic development.
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Affiliation(s)
- Federica Franciosi
- Division of Veterinary Anatomy and Histology, Department of Animal Sciences, University of Milan, Milan, Italy
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Macas E, Xie M, Schaufelberger S, Merki-Feld GS, Stiller R, Imthurn B. Vitrification of human single pronuclear oocytes following two approaches to polar body biopsy. Reprod Biomed Online 2011; 22:376-81. [DOI: 10.1016/j.rbmo.2011.01.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2010] [Revised: 11/29/2010] [Accepted: 01/11/2011] [Indexed: 10/18/2022]
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46
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Yamauchi Y, Shaman JA, Ward WS. Non-genetic contributions of the sperm nucleus to embryonic development. Asian J Androl 2011; 13:31-5. [PMID: 20953203 PMCID: PMC3015006 DOI: 10.1038/aja.2010.75] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Revised: 08/03/2010] [Accepted: 08/05/2010] [Indexed: 02/01/2023] Open
Abstract
Recent data from several laboratories have provided evidence that the newly fertilized oocyte inherits epigenetic signals from the sperm chromatin that are required for proper embryonic development. For the purposes of this review, the term epigenetic is used to describe all types of molecular information that are transmitted from the sperm cell to the embryo. There are at least six different forms of epigenetic information that have already been established as being required for proper embryogenesis in mammals or for which there is evidence that it may do so. These are (i) DNA methylation; (ii) sperm-specific histones, (iii) other chromatin-associated proteins; (iv) the perinuclear theca proteins; (v) sperm-born RNAs and, the focus of this review; and (vi) the DNA loop domain organization by the sperm nuclear matrix. These epigenetic signals should be considered when designing protocols for the manipulation and cryopreservation of spermatozoa for assisted reproductive technology as necessary components for effective fertilization and subsequent embryo development.
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Affiliation(s)
- Yasuhiro Yamauchi
- Department Anatomy and Reproductive Biology, Institute for Biogenesis Research, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI, USA
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47
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Johnson GD, Lalancette C, Linnemann AK, Leduc F, Boissonneault G, Krawetz SA. The sperm nucleus: chromatin, RNA, and the nuclear matrix. Reproduction 2011; 141:21-36. [PMID: 20876223 PMCID: PMC5358669 DOI: 10.1530/rep-10-0322] [Citation(s) in RCA: 123] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Within the sperm nucleus, the paternal genome remains functionally inert and protected following protamination. This is marked by a structural morphogenesis that is heralded by a striking reduction in nuclear volume. Despite these changes, both human and mouse spermatozoa maintain low levels of nucleosomes that appear non-randomly distributed throughout the genome. These regions may be necessary for organizing higher order genomic structure through interactions with the nuclear matrix. The promoters of this transcriptionally quiescent genome are differentially marked by modified histones that may poise downstream epigenetic effects. This notion is supported by increasing evidence that the embryo inherits these differing levels of chromatin organization. In concert with the suite of RNAs retained in the mature sperm, they may synergistically interact to direct early embryonic gene expression. Irrespective, these features reflect the transcriptional history of spermatogenic differentiation. As such, they may soon be utilized as clinical markers of male fertility. In this review, we explore and discuss how this may be orchestrated.
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Affiliation(s)
- Graham D. Johnson
- The Center for Molecular Medicine and Genetics, Wayne State University of Medicine, C.S. Mott Center, 275 E. Hancock, Detroit, MI 48201
| | - Claudia Lalancette
- The Center for Molecular Medicine and Genetics, Wayne State University of Medicine, C.S. Mott Center, 275 E. Hancock, Detroit, MI 48201
- Department of Obstetrics and Gynecology, Wayne State University of Medicine, C.S. Mott Center, 275 E. Hancock, Detroit, MI 48201
| | - Amelia K. Linnemann
- The Center for Molecular Medicine and Genetics, Wayne State University of Medicine, C.S. Mott Center, 275 E. Hancock, Detroit, MI 48201
| | - Frédéric Leduc
- Department of Biochemistry, Faculty of Medicine, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
| | - Guylain Boissonneault
- Department of Biochemistry, Faculty of Medicine, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4
| | - Stephen A. Krawetz
- The Center for Molecular Medicine and Genetics, Wayne State University of Medicine, C.S. Mott Center, 275 E. Hancock, Detroit, MI 48201
- Department of Obstetrics and Gynecology, Wayne State University of Medicine, C.S. Mott Center, 275 E. Hancock, Detroit, MI 48201
- Institute for Scientific Computing, Wayne State University of Medicine, C.S. Mott Center, 275 E. Hancock, Detroit, MI 48201
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Steger K, Cavalcanti MCO, Schuppe HC. Prognostic markers for competent human spermatozoa: fertilizing capacity and contribution to the embryo. ACTA ACUST UNITED AC 2010; 34:513-27. [DOI: 10.1111/j.1365-2605.2010.01129.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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49
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Brykczynska U, Hisano M, Erkek S, Ramos L, Oakeley EJ, Roloff TC, Beisel C, Schübeler D, Stadler MB, Peters AHFM. Repressive and active histone methylation mark distinct promoters in human and mouse spermatozoa. Nat Struct Mol Biol 2010; 17:679-87. [PMID: 20473313 DOI: 10.1038/nsmb.1821] [Citation(s) in RCA: 498] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2009] [Accepted: 03/24/2010] [Indexed: 11/09/2022]
Abstract
In higher eukaryotes, histone methylation is involved in maintaining cellular identity during somatic development. As most nucleosomes are replaced by protamines during spermatogenesis, it is unclear whether histone modifications function in paternal transmission of epigenetic information. Here we show that two modifications important for Trithorax- and Polycomb-mediated gene regulation have methylation-specific distributions at regulatory regions in human spermatozoa. Histone H3 Lys4 dimethylation (H3K4me2) marks genes that are relevant in spermatogenesis and cellular homeostasis. In contrast, histone H3 Lys27 trimethylation (H3K27me3) marks developmental regulators in sperm, as in somatic cells. However, nucleosomes are only moderately retained at regulatory regions in human sperm. Nonetheless, genes with extensive H3K27me3 coverage around transcriptional start sites in particular tend not to be expressed during male and female gametogenesis or in preimplantation embryos. Promoters of orthologous genes are similarly modified in mouse spermatozoa. These data are compatible with a role for Polycomb in repressing somatic determinants across generations, potentially in a variegating manner.
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50
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Barratt CLR, Aitken RJ, Björndahl L, Carrell DT, de Boer P, Kvist U, Lewis SEM, Perreault SD, Perry MJ, Ramos L, Robaire B, Ward S, Zini A. Sperm DNA: organization, protection and vulnerability: from basic science to clinical applications--a position report. Hum Reprod 2010; 25:824-38. [PMID: 20139429 DOI: 10.1093/humrep/dep465] [Citation(s) in RCA: 192] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
This article reports the results of the most recent in a series of EHSRE workshops designed to synthesize the current state of the field in Andrology and provide recommendations for future work (for details see Appendix). Its focus is on methods for detecting sperm DNA damage and potential application of new knowledge about sperm chromatin organization, vulnerability and repair to improve the diagnosis and treatment of clinical infertility associated with that damage. Equally important is the use and reliability of these tests to identify the extent to which environmental contaminants or pharmaceutical agents may contribute to the incidence of sperm DNA damage and male fertility problems. A working group (for workshop details, see Appendix) under the auspices of ESHRE met in May 2009 to assess the current knowledgebase and suggest future basic and clinical research directions. This document presents a synthesis of the working group's understanding of the recent literature and collective discussions on the current state of knowledge of sperm chromatin structure and function during fertilization. It highlights the biological, assay and clinical uncertainties that require further research and ends with a series of 5 key recommendations.
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Affiliation(s)
- Christopher L R Barratt
- Reproductive and Developmental Biology, Maternal and Child Health Science Laboratories, Centre for Oncology and Molecular Medicine, Ninewells Hospital, University of Dundee, Dundee DD1 9SY, UK.
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