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Ezoe K, Coticchio G, Takenouchi H, Taoda S, Namerikawa S, Honda K, Miki T, Okimura T, Kobayashi T, Borini A, Kato K. Spatiotemporal perturbations of pronuclear breakdown preceding syngamy affect early human embryo development: a retrospective observational study. J Assist Reprod Genet 2022; 39:75-84. [PMID: 34642876 PMCID: PMC8866620 DOI: 10.1007/s10815-021-02335-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 09/28/2021] [Indexed: 01/03/2023] Open
Abstract
PURPOSE During fertilisation, female and male pronuclei (PNs) migrate to the centre of the ooplasm, juxtapose, and break down synchronously in preparation for the first mitosis. While PN non-juxtaposition and PN breakdown (PNBD) asynchrony are occasionally observed, their developmental implications remain uncertain. This study investigated the possible relationships among the two phenomena, preimplantation development patterns, and live birth rates in single blastocyst transfers. METHODS A total of 1455 fertilised oocytes cultured in a time-lapse incubator were retrospectively analysed. Fertilised oocytes were divided into four groups according to the presence of PN juxtaposition and breakdown synchrony. The relationships of abnormal PN behaviour with embryo morphokinetics, blastocyst formation, and live birth were evaluated. RESULTS PN non-juxtaposition and asynchrony were observed in 1.9% and 1.0% of fertilised oocytes, respectively. The blastocyst cryopreservation rates in the synchronous-non-juxtaposed and asynchronous-non-juxtaposed groups were significantly lower than that in the synchronous-juxtaposed group. The rates of clinical pregnancy, ongoing pregnancy, and live birth were comparable among the groups. Non-juxtaposition was significantly associated with increased trichotomous cleavage at the first cytokinesis (P < 0.0001) and an increase in the time interval from PNBD to first cleavage (P < 0.0001). Furthermore, asynchronous PNBD was significantly correlated with increased rapid cleavage at the first cytokinesis (P = 0.0100). CONCLUSION Non-juxtaposition and asynchronous PNBD is associated with abnormal mitosis at the first cleavage and impaired preimplantation development. However, embryos displaying abnormal PNBD may develop to blastocyst stage and produce live births, suggesting blastocyst transfer as a more appropriate culture strategy.
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Affiliation(s)
- Kenji Ezoe
- Kato Ladies Clinic, 7-20-3 Nishishinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan
| | - Giovanni Coticchio
- 9.Baby, Family and Fertility Center, Via Dante 15, 40125, Bologna, Italy
| | - Hitomi Takenouchi
- Kato Ladies Clinic, 7-20-3 Nishishinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan
| | - Shota Taoda
- Kato Ladies Clinic, 7-20-3 Nishishinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan
| | - Shima Namerikawa
- Kato Ladies Clinic, 7-20-3 Nishishinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan
| | - Kasumi Honda
- Kato Ladies Clinic, 7-20-3 Nishishinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan
| | - Tetsuya Miki
- Kato Ladies Clinic, 7-20-3 Nishishinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan
| | - Tadashi Okimura
- Kato Ladies Clinic, 7-20-3 Nishishinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan
| | - Tamotsu Kobayashi
- Kato Ladies Clinic, 7-20-3 Nishishinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan
| | - Andrea Borini
- 9.Baby, Family and Fertility Center, Via Dante 15, 40125, Bologna, Italy
| | - Keiichi Kato
- Kato Ladies Clinic, 7-20-3 Nishishinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan.
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Cavazza T, Takeda Y, Politi AZ, Aushev M, Aldag P, Baker C, Choudhary M, Bucevičius J, Lukinavičius G, Elder K, Blayney M, Lucas-Hahn A, Niemann H, Herbert M, Schuh M. Parental genome unification is highly error-prone in mammalian embryos. Cell 2021; 184:2860-2877.e22. [PMID: 33964210 PMCID: PMC8162515 DOI: 10.1016/j.cell.2021.04.013] [Citation(s) in RCA: 75] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 02/05/2021] [Accepted: 04/08/2021] [Indexed: 12/19/2022]
Abstract
Most human embryos are aneuploid. Aneuploidy frequently arises during the early mitotic divisions of the embryo, but its origin remains elusive. Human zygotes that cluster their nucleoli at the pronuclear interface are thought to be more likely to develop into healthy euploid embryos. Here, we show that the parental genomes cluster with nucleoli in each pronucleus within human and bovine zygotes, and clustering is required for the reliable unification of the parental genomes after fertilization. During migration of intact pronuclei, the parental genomes polarize toward each other in a process driven by centrosomes, dynein, microtubules, and nuclear pore complexes. The maternal and paternal chromosomes eventually cluster at the pronuclear interface, in direct proximity to each other, yet separated. Parental genome clustering ensures the rapid unification of the parental genomes on nuclear envelope breakdown. However, clustering often fails, leading to chromosome segregation errors and micronuclei, incompatible with healthy embryo development.
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Affiliation(s)
- Tommaso Cavazza
- Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Yuko Takeda
- Wellcome Centre for Mitochondrial Research, Biosciences Institute, Newcastle University, NE1 4EP Newcastle upon Tyne, UK
| | - Antonio Z Politi
- Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Magomet Aushev
- Wellcome Centre for Mitochondrial Research, Biosciences Institute, Newcastle University, NE1 4EP Newcastle upon Tyne, UK
| | - Patrick Aldag
- Institute of Farm Animal Genetics, Biotechnology, Friedrich-Loeffler-Institute, Mariensee, 31535 Neustadt, Germany
| | | | - Meenakshi Choudhary
- Newcastle Fertility Centre at Life, Newcastle upon Tyne Hospitals NHS Foundation Trust, NE1 4EP Newcastle upon Tyne, UK
| | - Jonas Bucevičius
- Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | | | - Kay Elder
- Bourn Hall Clinic, CB23 2TN Cambridge, UK
| | | | - Andrea Lucas-Hahn
- Institute of Farm Animal Genetics, Biotechnology, Friedrich-Loeffler-Institute, Mariensee, 31535 Neustadt, Germany
| | - Heiner Niemann
- Institute of Farm Animal Genetics, Biotechnology, Friedrich-Loeffler-Institute, Mariensee, 31535 Neustadt, Germany
| | - Mary Herbert
- Wellcome Centre for Mitochondrial Research, Biosciences Institute, Newcastle University, NE1 4EP Newcastle upon Tyne, UK; Newcastle Fertility Centre at Life, Newcastle upon Tyne Hospitals NHS Foundation Trust, NE1 4EP Newcastle upon Tyne, UK
| | - Melina Schuh
- Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany.
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Anbari F, Khalili MA, Agha-Rahimi A, Maleki B, Nabi A, Esfandiari N. Does sperm DNA fragmentation have negative impact on embryo morphology and morphokinetics in IVF programme? Andrologia 2020; 52:e13798. [PMID: 33017474 DOI: 10.1111/and.13798] [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: 04/20/2020] [Revised: 06/27/2020] [Accepted: 07/14/2020] [Indexed: 11/29/2022] Open
Abstract
Evaluation of sperm integrity may predict the in vitro fertilisation (IVF) outcomes. The aim was to evaluate the relationship between the sperm DNA fragmentation (sDNAf) with embryo morphology and morphokinetic using time-laps monitoring (TLM) and to select the best time points for normalisation in IVF setting. After evaluating the fertilisation and pronuclei (Z) scoring, 328 normally fertilised oocytes were assessed to time of pronuclei fading, time of 2 to 8 discrete cells (t2-t8) and abnormal cleavage patterns, such as multinucleation, direct cleavage, reverse cleavage and fragmentation. Sperm chromatin dispersion (SCD) assay was used for assessment of prepared sperm chromatin status. SCD was categorised into 4 groups of <6.5, 6.5-10.7, 10.7-20.1 and >20.1. The finding showed significant differences in t6 (p = .012), t7 (p = .045), t8 (p = .013) and s1 (p = .001) between 4 SCD groups. When morphokinetic variables were normalised to tPNf, this difference was observed in t2 (p = .003) and t6 (p = .017). Subsequently, the percentage of top quality embryos and Z1 scoring were dependent to the sDNAf rate. In conclusion, tPNf was the best reference time point in IVF cycles. Also, we found high sDNAf rate had no negative impact on embryo morphology and morphokinetics in conventional IVF.
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Affiliation(s)
- Fatemeh Anbari
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Department of Reproductive Biology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mohammad Ali Khalili
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Department of Reproductive Biology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Azam Agha-Rahimi
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Department of Reproductive Biology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Behnam Maleki
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Department of Reproductive Biology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Ali Nabi
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Department of Reproductive Biology, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Navid Esfandiari
- Department of Obstetrics and Gynecology, Dartmouth Hitchcock Medical Center, Lebanon, NH, USA.,Geisel School of Medicine at Dartmouth, Hanover, NH, USA
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Tam Le M, Van Nguyen T, Thanh Nguyen T, Thanh Thi Nguyen T, An Thi Nguyen T, Huy Vu Nguyen Q, Thanh Cao N. Does polycystic ovary syndrome affect morphokinetics or abnormalities in early embryonic development? Eur J Obstet Gynecol Reprod Biol X 2019; 3:100045. [PMID: 31403129 PMCID: PMC6687388 DOI: 10.1016/j.eurox.2019.100045] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Revised: 05/01/2019] [Accepted: 05/10/2019] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVES This study aimed to investigate whether oocyte retrieval from PCOS patients affects the morphokinetics or the incidence of abnormalities in early embryonic development, using time-lapse imaging analysis. METHODS This was a prospective study in total of 39 PCOS patients and 67 women with normal ovarian function, underwent a GnRH antagonist protocol of controlled ovarian stimulation and fertilization by ICSI. 402 zygotes from the PCOS group and 449 zygotes from the control group were observed by time-lapse monitoring for 48 h following sperm injection. RESULTS Patients with PCOS showed a significantly higher number of retrieved oocytes, and a significantly higher number of metaphase II oocytes per cycle than that of the non-PCOS group (18.85 ± 9.41 vs. 11.48 ± 5.51 and 14.97 ± 7.43 vs. 9.51 ± 4.7, respectively). However, oocyte maturation rate and morphologically assessed embryo quality did not differ between two groups. After 48 h of the embryo culture using time-lapse video recording, most of the embryos in both groups had reached the 4-cell stage (353/449 vs. 314/402 embryos). There were no significant differences between the control and PCOS group regarding the time-points of the successive events in early embryonic development from the appearance of 2 polar bodies to the 6-cell stage. However, the percentage of t2 stages which fell in "optimal range" (>24 h and ≤28 h) was significantly lower in the PCOS group than in the control group (37.8% vs. 48.1%, P = 0.004). The proportion of embryos manifesting abnormal fertility, multinucleation, direct cleavage and reverse cleavage were not significantly different between the two groups. CONCLUSION Our data indicated that PCOS does not affect the morphokinetics or incidence of abnormalities in early embryonic development.
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Affiliation(s)
- Minh Tam Le
- Department of OBGYN, Hue University of Medicine and Pharmacy, Hue University, 06 Ngo Quyen Street, Hue, Viet Nam
- Center for Reproductive Endocrinology and Infertility, Hue University of Medicine and Pharmacy, Hue University, 06 Ngo Quyen Street, Hue, Viet Nam
| | - Trung Van Nguyen
- Center for Reproductive Endocrinology and Infertility, Hue University of Medicine and Pharmacy, Hue University, 06 Ngo Quyen Street, Hue, Viet Nam
| | - Tung Thanh Nguyen
- Department of Histology and Embryology, Hue University of Medicine and Pharmacy, Hue University, 06 Ngo Quyen Street, Hue, Viet Nam
| | - Thai Thanh Thi Nguyen
- Center for Reproductive Endocrinology and Infertility, Hue University of Medicine and Pharmacy, Hue University, 06 Ngo Quyen Street, Hue, Viet Nam
| | - Tam An Thi Nguyen
- Center for Reproductive Endocrinology and Infertility, Hue University of Medicine and Pharmacy, Hue University, 06 Ngo Quyen Street, Hue, Viet Nam
| | - Quoc Huy Vu Nguyen
- Department of OBGYN, Hue University of Medicine and Pharmacy, Hue University, 06 Ngo Quyen Street, Hue, Viet Nam
| | - Ngoc Thanh Cao
- Department of OBGYN, Hue University of Medicine and Pharmacy, Hue University, 06 Ngo Quyen Street, Hue, Viet Nam
- Center for Reproductive Endocrinology and Infertility, Hue University of Medicine and Pharmacy, Hue University, 06 Ngo Quyen Street, Hue, Viet Nam
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Faramarzi A, Khalili MA, Mangoli E. Correlations between embryo morphokinetic development and maternal age: Results from an intracytoplasmic sperm injection program. Clin Exp Reprod Med 2019; 46:119-124. [PMID: 31220913 PMCID: PMC6736511 DOI: 10.5653/cerm.2019.02838] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 05/02/2019] [Indexed: 01/16/2023] Open
Abstract
Objective It is widely accepted that aging decreases women’s fertility capacity. The aim of this study was to assess correlations between maternal age and the morphokinetic parameters and cleavage pattern of embryos. Methods The morphokinetics of embryos derived from women <30, 30–35, 36–40, and >40 years of age were compared retrospectively in terms of time of second polar body extrusion, time of pronuclei appearance, time of pronuclei fading, and time of two to eight discrete cells (t2–t8). Furthermore, abnormal cleavage patterns such as uneven blastomeres at the two-cell stage, cell fusion (Fu), and trichotomous mitoses (TM) were assessed. Results Only t5 occurred later in women aged 36–40 and >40 years when compared with those aged <30 and 30–35 years (p<0.001). Other morphokinetic timing parameters, as well the presence of uneven blastomeres, were comparable between the groups (p>0.05). However, Fu and TM were more common in women aged >40 years than in younger women (p<0.001). Conclusion Maternal age was correlated with the cleavage pattern of embryos. Therefore, evaluating embryo morphokinetics may contribute to optimal embryo selection, thereby increasing fertility in patients with advanced maternal age.
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Affiliation(s)
- Azita Faramarzi
- Fertility and Infertility Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.,Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mohammad Ali Khalili
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Department of Reproductive Biology, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Esmat Mangoli
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
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6
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Faramarzi A, Khalili MA, Jahromi MG. Is there any correlation between apoptotic genes expression in cumulus cells with embryo morphokinetics? Mol Biol Rep 2019; 46:3663-3670. [PMID: 31154602 DOI: 10.1007/s11033-019-04781-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Accepted: 03/21/2019] [Indexed: 01/17/2023]
Abstract
The aim was to assess the correlation between apoptotic genes of cumulus cells (CCs) with embryo morphokinetics as non invasive methods for embryo selection. Evaluation of cleavage activity among in vitro-fertilized embryos was dependent on determining not only expression profiles of pro- and anti-apoptotic genes in CCs surrounding ovulated oocytes but also morphokinetic parameters such as time of second PB extrusion (tPB2), pronuclei appearance (tPN), pronuclei fading (tPNf), formation of two to eight cells (t2-t8) and cleavage pattern [uneven at two cells stage, cell fusion (Fu) and trichomonas mitoses (TM)]. A total of 269 embryos from 90 intracytoplasmic sperm injection (ICSI) cycles were assessed. The data showed that t2 was associated with CCs expression of Bax, Caspase3 Bcl2 and bax/bcl2 (p = 0.000, p = 0.000, p = 0.04, p = 0.00, respectively). Uneven blastomeres embryo associated with Bax and Caspase3 (p = 0.007, p = 0.000 respectively) as well as Fu and TM embryo significantly correlated to CCs expression of Bax, Caspase3 Bcl2 and bax/bcl2 (p = 0.000, p = 0.000, p = 0.00, p = 0.00, respectively) (p = 0.006, p = 0.000, p = 0.009, p = 0.0340, respectively). Embryo morphokinetics and cleavage pattern associated with CCs apoptotic gene expression. It seems that embryo selection by morphokinetics assessment using TLM with conjunction in CCs gene expression can improve ART outcome.
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Affiliation(s)
- Azita Faramarzi
- Fertility and Infertility Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.,Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mohammad Ali Khalili
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. .,Department of Reproductive Biology, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
| | - Masoumeh Golestan Jahromi
- Research and Clinical Center for Infertility, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Central Research Laboratory, Jahrom University of Medical Sciences, Jahrom, Iran
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Does rescue in vitro maturation of germinal vesicle stage oocytes impair embryo morphokinetics development? ZYGOTE 2018; 26:430-434. [PMID: 30419976 DOI: 10.1017/s0967199418000515] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
SummaryCurrently, rescue in vitro maturation (IVM) is not a routine method in assisted reproductive treatment (ART) programmes but is a promising procedure for ART to improve IVM. The aim of this study was to compare embryo morphokinetics of germinal vesicles (GV) with metaphase II (MII) oocytes from controlled ovarian hyperstimulation (COH) cycles by time-lapse photography monitoring (TLM). Morphokinetics of the same number of embryos derived from the in vivo (group I) and rescue of in vitro matured oocytes (group II) from 310 patients were analyzed and compared retrospectively. The time to form second PB extrusion (tPB2), time of pronuclei appearance (tPNa), time of pronuclei fading (tPNf) and time of two to eight discrete cells (t2-t8) were assessed. Abnormal cleavage patterns such as uneven blastomeres at the two-cell stage, cell fusion (Fu), trichotomous mitoses (TM), and the rates of embryo arrest were assessed. These data showed that tPB2, tPNa, tPNf, t2, t3 and t4 stages took place later in group II compared with group I (P<0.001, P=0.017, P<0.001, P<0.001, P<0.001, P<0.001, respectively). The rates of uneven blastomeres, Fu, TM, and embryo arrest were increased significantly in group II compared with group I (P=0.001, P<0.001, P=0.003, P<0.001, respectively). Based on the exact annotation of timing parameters and cleavage patterns, the present data agreed with the concept that rescue IVM of oocytes negatively influences embryo morphokinetics. Therefore, cautious use of embryos derived from rescue IVM of GV oocytes should be made.
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