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Zhang C, Wang M, Li Y, Zhang Y. Profiling and functional characterization of maternal mRNA translation during mouse maternal-to-zygotic transition. SCIENCE ADVANCES 2022; 8:eabj3967. [PMID: 35108058 PMCID: PMC8809684 DOI: 10.1126/sciadv.abj3967] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Translational regulation plays an important role in gene expression and function. Although the transcriptional dynamics of mouse preimplantation embryos have been well characterized, the global mRNA translation landscape and the master regulators of zygotic genome activation (ZGA) remain unknown. Here, by developing and applying a low-input ribosome profiling (LiRibo-seq) technique, we profiled the mRNA translation landscape in mouse preimplantation embryos and revealed the translational dynamics during mouse preimplantation development. We identified a marked translational transition from MII oocytes to zygotes and demonstrated that active translation of maternal mRNAs is essential for maternal-to-zygotic transition (MZT). We further showed that two maternal factors, Smarcd2 and Cyclin T2, whose translation is activated in zygotes, are required for chromatin reprogramming and ZGA, respectively. Our study thus not only filled in a knowledge gap on translational regulation during mammalian preimplantation development but also revealed insights into the critical function of maternal mRNA translation in MZT.
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Affiliation(s)
- Chunxia Zhang
- Howard Hughes Medical Institute, Boston Children’s Hospital, Boston, MA 02115, USA
- Program in Cellular and Molecular Medicine, Boston Children’s Hospital, Boston, MA 02115, USA
| | - Meng Wang
- Howard Hughes Medical Institute, Boston Children’s Hospital, Boston, MA 02115, USA
- Program in Cellular and Molecular Medicine, Boston Children’s Hospital, Boston, MA 02115, USA
| | - Yisi Li
- Howard Hughes Medical Institute, Boston Children’s Hospital, Boston, MA 02115, USA
- Program in Cellular and Molecular Medicine, Boston Children’s Hospital, Boston, MA 02115, USA
- Department of Automation, Tsinghua University, Beijing 100084, China
| | - Yi Zhang
- Howard Hughes Medical Institute, Boston Children’s Hospital, Boston, MA 02115, USA
- Program in Cellular and Molecular Medicine, Boston Children’s Hospital, Boston, MA 02115, USA
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
- Harvard Stem Cell Institute, Boston, MA 02115, USA
- Corresponding author.
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Liu Y, Jones C, Coward K. An investigation of mechanisms underlying mouse blastocyst hatching: a ribonucleic acid sequencing study. F&S SCIENCE 2022; 3:35-48. [PMID: 35559994 DOI: 10.1016/j.xfss.2021.12.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 12/17/2021] [Accepted: 12/17/2021] [Indexed: 06/15/2023]
Abstract
OBJECTIVE To investigate the regulatory mechanisms and signaling molecules underlying hatching in mouse embryos. DESIGN Experimental laboratory study using a mouse embryo model. SETTING University-based basic scientific research laboratory. ANIMALS A total of 40 B6C3F1 × B6D2F1 mouse embryos were used in this study. INTERVENTION(S) Frozen/thawed mouse embryos, at the 8-cell stage, were cultured in vitro for 2 days. The resulting hatching and prehatching blastocysts were then used for complementary deoxyribonucleic acid (cDNA) library preparation and ribonucleic acid (RNA) sequencing analysis (n = 8 for each group). Differentially expressed genes were then used for downstream functional analysis. In addition, a list of genes related to developmental progression in humans was used to identify genes that were potentially related to the hatching of human embryos. MAIN OUTCOME MEASURE(S) Differentially expressed genes, enriched Gene Ontology terms and canonical pathways, clustered gene networks, activated upstream regulators, and common genes between a gene list of hatching-related genes in mice and a gene list associated with developmental progression in humans. RESULT(S) A total 275 differentially expressed genes were identified between hatching and prehatching blastocysts: 230 up-regulated and 45 down-regulated genes. Functional enrichment analysis suggested that blastocyst hatching in vitro is an adenosine triphosphate (ATP)-dependent process that involves protein biosynthesis and organization of the cytoskeleton. Furthermore, by regulating cell motility, the RhoA signaling pathway (including Arpc2, Cfl1, Gsn, Pfn1, Tpi1, Grb2, Tmsb10, Enah, and Rnd3 genes) may be a crucial signaling pathway during hatching. We also identified a cluster of genes (Krt8, Krt7, Cldn4, and Aqp3) that exerted functional roles in cell-cell junctions and water homeostasis during hatching. Moreover, some growth factors (angiotensinogen and fibroblast growth factor 2) and endocrine factors (estrogen receptor and prolactin) were predicted to be involved in the regulation of embryo hatching. In addition, we identified 81 potential genes that are potentially involved in the hatching process in human embryos. CONCLUSION(S) Our analysis identified potential genes and molecular regulatory pathways involved in the blastocyst hatching process in mice; we also identified genes that may potentially regulate hatching in human embryos. Our findings enhance our knowledge of embryo development and provide useful information for further exploring the mechanisms underlying embryo hatching.
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Affiliation(s)
- Yaqiong Liu
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Women's Centre, John Radcliffe Hospital, Headington, Oxford, United Kingdom
| | - Celine Jones
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Women's Centre, John Radcliffe Hospital, Headington, Oxford, United Kingdom
| | - Kevin Coward
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Women's Centre, John Radcliffe Hospital, Headington, Oxford, United Kingdom.
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3
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An L, Liu Y, Li M, Liu Z, Wang Z, Dai Y, Presicce GA, Du F. Site specificity of blastocyst hatching significantly influences pregnancy outcomes in mice. FASEB J 2021; 35:e21812. [PMID: 34411354 DOI: 10.1096/fj.202100653r] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/25/2021] [Accepted: 07/07/2021] [Indexed: 11/11/2022]
Abstract
Blastocysts hatch from the zona pellucida (ZP) to enable implantation into the uterine endometrial epithelium, but little is known regarding the effect of hatching sites on pregnancy outcomes. Murine hatching embryos were categorized into five groups based on initial trophectoderm projection (TEP)/ZP position corresponding to the inner cell mass center. In blastocysts (3.5 dpc) post-12 hours in vitro culture, TEP rates of A-site (44.4%) and B-site (38.6%) embryos were higher than those of C-site (12.5%) and D-site (3.1%) embryos, while the O-site (1.4%) was the lowest (P < .05). Post-ET A-site (55.6%) and B-site (65.6%) birth rates were higher than those of C-site embryos (21.3%) and controls (P < .05). Furthermore, live birth rate of B-site embryos remained higher than C-site embryos (68.8% vs 31.3%; P < .05) when both were transferred into the same recipients. Different TEP site blastocysts exhibited different implantation competences: the implantation rate of C-site embryos was lower than that of both A- and B-site groups (67.7% vs 84.3% and 83.2%, respectively; P < .05) at 2 days post-ET. C-site embryos also had a distinctly higher ratio of developmental defects (47.5%) than A- and B-site embryos (22.5% and 14.6%, respectively), with implantation failure mainly associated with poor birth rate, a finding corroborated by differential gene expression analysis such as LIF, LIFR, and S100a9. Surprisingly, acidified Tyrode's solution (AAH)-treated B-site blastocysts had a significantly increased birth rate (77.1%) than C-site (55.3%) and controls (43.4%). Site specificity and differential gene expression during embryo hatching can be applied in ART screening. More importantly, assisted hatching by AAH is effective and feasible for improving pregnancy and term development, particularly at the B-site, for humans and in animal husbandry.
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Affiliation(s)
- Liyou An
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China.,Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi, China
| | - Yanhong Liu
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Mingyang Li
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Zhihui Liu
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Zhisong Wang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Yujian Dai
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | | | - Fuliang Du
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
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Hildebrand S, Hultin S, Subramani A, Petropoulos S, Zhang Y, Cao X, Mpindi J, Kalloniemi O, Johansson S, Majumdar A, Lanner F, Holmgren L. The E-cadherin/AmotL2 complex organizes actin filaments required for epithelial hexagonal packing and blastocyst hatching. Sci Rep 2017; 7:9540. [PMID: 28842668 PMCID: PMC5572699 DOI: 10.1038/s41598-017-10102-w] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 08/03/2017] [Indexed: 12/13/2022] Open
Abstract
Epithelial cells connect via cell-cell junctions to form sheets of cells with separate cellular compartments. These cellular connections are essential for the generation of cellular forms and shapes consistent with organ function. Tissue modulation is dependent on the fine-tuning of mechanical forces that are transmitted in part through the actin connection to E-cadherin as well as other components in the adherens junctions. In this report we show that p100 amotL2 forms a complex with E-cadherin that associates with radial actin filaments connecting cells over multiple layers. Genetic inactivation or depletion of amotL2 in epithelial cells in vitro or zebrafish and mouse in vivo, resulted in the loss of contractile actin filaments and perturbed epithelial packing geometry. We further showed that AMOTL2 mRNA and protein was expressed in the trophectoderm of human and mouse blastocysts. Genetic inactivation of amotL2 did not affect cellular differentiation but blocked hatching of the blastocysts from the zona pellucida. These results were mimicked by treatment with the myosin II inhibitor blebbistatin. We propose that the tension generated by the E-cadherin/AmotL2/actin filaments plays a crucial role in developmental processes such as epithelial geometrical packing as well as generation of forces required for blastocyst hatching.
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Affiliation(s)
- Sebastian Hildebrand
- Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet and Division of Obstetrics and Gynecology, Karolinska University Hospital, Huddinge, Sweden.,Department of Oncology-Pathology, Cancer Centrum Karolinska (CCK), Karolinska Institutet, Stockholm, Sweden
| | - Sara Hultin
- Department of Oncology-Pathology, Cancer Centrum Karolinska (CCK), Karolinska Institutet, Stockholm, Sweden
| | - Aravindh Subramani
- Department of Oncology-Pathology, Cancer Centrum Karolinska (CCK), Karolinska Institutet, Stockholm, Sweden
| | - Sophie Petropoulos
- Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet and Division of Obstetrics and Gynecology, Karolinska University Hospital, Huddinge, Sweden
| | - Yuanyuan Zhang
- Department of Oncology-Pathology, Cancer Centrum Karolinska (CCK), Karolinska Institutet, Stockholm, Sweden
| | - Xiaofang Cao
- Department of Medical Biochemistry and Microbiology, Uppsala Biomedical Center (BMC), Uppsala University, Uppsala, Sweden
| | - John Mpindi
- Medical Biotechnology, VTT Technical Research Centre of Finland, Turku, Finland.,Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland
| | - Olli Kalloniemi
- Medical Biotechnology, VTT Technical Research Centre of Finland, Turku, Finland.,Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland
| | - Staffan Johansson
- Department of Medical Biochemistry and Microbiology, Uppsala Biomedical Center (BMC), Uppsala University, Uppsala, Sweden
| | - Arindam Majumdar
- Department of Oncology-Pathology, Cancer Centrum Karolinska (CCK), Karolinska Institutet, Stockholm, Sweden.,Eli Lilly and Company, Lilly Corporate Center, Indianapolis, IN, 46285, USA
| | - Fredrik Lanner
- Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet and Division of Obstetrics and Gynecology, Karolinska University Hospital, Huddinge, Sweden.
| | - Lars Holmgren
- Department of Oncology-Pathology, Cancer Centrum Karolinska (CCK), Karolinska Institutet, Stockholm, Sweden.
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Onodera Y, Takahashi K, Goto M, Anzai M, Ono N, Shirasawa H, Sato W, Miura H, Sato N, Sato A, Kumazawa Y, Terada Y. The location of "8"-shaped hatching influences inner cell mass formation in mouse blastocysts. PLoS One 2017; 12:e0175150. [PMID: 28384351 PMCID: PMC5383253 DOI: 10.1371/journal.pone.0175150] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 03/21/2017] [Indexed: 11/25/2022] Open
Abstract
The hatching of a blastocyst where the blastocyst portions on the inside and the outside of the zona pellucida feature a figure-of-eight shape is termed “8”-shaped hatching; this type of hatching has been reported to affect the proper presentation of the inner cell mass (ICM) in both human and mouse embryos. Here, our aim was to investigate the factors that affect ICM presentation during “8”-shaped hatching. We performed IVF by using B6D2F1 female mice and ICR male mice, and used the 104 captured blastocysts. Embryos were maintained in KSOM at 37°C in a 5% CO2, 5% O2, and 90% N2 environment, and their growth behavior was monitored individually and continuously using time-lapse cinematography. At 120 h after insemination, embryos were immunostained and examined under a confocal microscope. We used the hatching form to identify “8”-shaped hatching, and we classified the “8”-shaped-hatching blastocysts into two groups, one in which the hatching site was near the ICM center, and the other in which the hatching site was far from the ICM center. We measured each group for ICM size and the number of Oct3/4-positive cells. Of the 95 hatching or hatched embryos, 74 were “8”-shaped-hatching blastocysts, and in these embryos, the ICM was significantly wider when the hatching site was near the ICM than when the hatching site was far from the ICM (P = 0.0091). Moreover, in the “8”-shaped-hatching blastocysts in which the ICM was included in the blastocyst portion outside the zona pellucida―the portion defined as the “outside blastocyst”―after the collapse of this outside blastocyst, the ICM adhered to the trophectoderm of the outside blastocyst, opposite the hatching site. Our results indicate that in “8”-shaped-hatching blastocysts, the hatching site and the collapse of outside blastocyst affect ICM formation. Thus, the assessment of “8”-shaped hatching behaviors could yield indices for accurately evaluating embryo quality.
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Affiliation(s)
- Yohei Onodera
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
- * E-mail:
| | - Kazumasa Takahashi
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Mayumi Goto
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Mibuki Anzai
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Natsuki Ono
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Hiromitsu Shirasawa
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Wataru Sato
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Hiroshi Miura
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Naoki Sato
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Akira Sato
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Yukiyo Kumazawa
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
| | - Yukihiro Terada
- Department of Obstetrics and Gynecology, Akita University Graduate School of Medicine, Akita, Japan
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6
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Laser assisted zona thinning technique has no beneficial effect on the ART outcomes of two different maternal age groups. J Assist Reprod Genet 2010; 27:457-61. [PMID: 20467801 DOI: 10.1007/s10815-010-9431-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2010] [Accepted: 04/28/2010] [Indexed: 10/19/2022] Open
Abstract
PURPOSE Laser assisted zona thinning is a technique used for facilitating embryo's hatching process and is commonly used for the embryos of poor prognosis patients with advanced maternal age, repeated implantation failures, poor embryo quality or thick zona pellucida. The aim of this study was to investigate the effect of zona thinning on both good or poor prognosis patients of two different age groups. METHODS We investigated two different age groups (group 1: <35 years and group 2: ≥35 years ) and compared the effect of assisted zona thinning (groups 1A and 2A) versus not-thinned controls (groups 1B and 2B) in both groups. RESULTS The clinical pregnancy rates were 57% and 56% in groups 1A and 1B (p = 0.86), 43% and 38% in groups 2A and 2B (p = 0.59) respectively. CONCLUSIONS Our results suggest that laser assisted zona thinning of day 3 embryos has no beneficial effect on clinical pregnancy and implantation outcomes.
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Miyata H, Matsubayashi H, Fukutomi N, Matsuba J, Koizumi A, Tomiyama T. Relevance of the site of assisted hatching in thawed human blastocysts: a preliminary report. Fertil Steril 2010; 94:2444-7. [PMID: 20189555 DOI: 10.1016/j.fertnstert.2010.01.056] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2009] [Revised: 01/20/2010] [Accepted: 01/21/2010] [Indexed: 11/29/2022]
Abstract
Preliminary data from a prospective randomized study of assisted hatching (AH) of thawed human blastocysts demonstrated that the rate of complete hatching was significantly higher for AH performed near the inner cell mass (ICM) than for AH at the side opposite to the ICM. This suggests the existence of polarity in the hatching process in human blastocysts, which requires further evaluation.
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8
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Suzuki R, Niimura S. Hatching and distribution of actin filaments in mouse blastocysts whose activities of protein kinase A were suppressed by H-89. J Reprod Dev 2009; 56:103-9. [PMID: 19881218 DOI: 10.1262/jrd.09-144m] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The role of actin filaments and contractions in hatching was determined in mouse blastocysts whose actin filament bundling abilities had been suppressed by H-89, an inhibitor of protein kinase A. The hatching rate of blastocysts developed from morulae in a medium containing H-89 at a concentration of 4.0 microM was 17.2%, which was significantly lower than the 76.7% of the control blastocysts developed from morulae in a medium without H-89. The rates of blastocysts starting hatching and forming a slit in the zona pellucida were significantly lower in H-89-treated blastocysts (84.4 and 21.9%) than in control blastocysts (100.0 and 90.6%). The lengths of time needed for slit formation in the zona pellucida and for completion of hatching were significantly longer in the H-89-treated blastocysts (27.4 and 43.3 h) than in the control blastocysts (6.5 and 18.8 h). Over the course of 32 h after blastocoel formation, the number of strong contractions was similar in the H-89-treated and control blastocysts, but the number of weak contractions was significantly fewer in the H-89-treated blastocysts (2.41 times) than in the control blastocysts (4.19 times). Although the distribution of actin filaments was similar in the H-89-treated and control blastocysts in the pre-hatching, hatching and post-hatching periods, the rate of H-89-treated blastocysts in which most trophectoderm cells possessed the fluorescence of actin filaments (12.7%) was significantly lower than the 95.0% of the control blastocysts in the pre-hatching period. These results suggest that actin filament-mediated movements of trophectoderm cells contribute to hatching by facilitating the protrusion of trophectoderm cells from a small hole in the zona pellucida and by enlarging the protrusion. We also suggest that the low hatching ability of the treated blastocysts is related to weak contractions with a low frequency and to strong contractions requiring a longer time for re-expansion.
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Affiliation(s)
- Ryosuke Suzuki
- Graduate School of Science and Technology, Niigata University, Japan
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9
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Nishio E, Moriwaki T, Yoshii K, Udagawa Y. Chemical removal of zona pellucida versus laser assisted hatching after repeated failures of assisted reproductive technology. Reprod Med Biol 2006; 5:263-267. [PMID: 29699255 DOI: 10.1111/j.1447-0578.2006.00151.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Background and Aims: To evaluate outcomes after zona pellucida removal by pronase or laser assisted hatching in women with repeated assisted reproduction failures. Methods: Of 389 procedures (January 2004 to November 2005), 203 control cycles had an intact zona, 116 cycles had chemical removal of the zona and 70 cycles had laser assisted hatching. Rates of pregnancy, implantation and abortion were compared, and pregnancy rate was secondarily evaluated for fresh or frozen-thawed blastocysts. Results: Pregnancy rates were 33.5% (68/203) for controls, 29.3% (34/116) for chemical removal and 30.0% (21/70) for laser. Implantation rates were 24.8% (68/274) for controls, 21.8% (34/156) for chemical removal and 30.0% (21/105) for laser. There were no significant differences among groups. Abortion rates were 15.6% (10/64) for controls, 13.9% (5/36) for chemical removal and 14.3% (3/21) for laser. No difference was observed by blastocyst type for control or laser assisted hatching cycles. In the chemical removal group, both pregnancy and implantation rates were higher for frozen-thawed blastocysts than for fresh blastocysts. (41.5%vs 13.2% and 30.7%vs 11.1%, respectively). Conclusions: Assisted hatching did not show a significant benefit. Chemical zona pellucida removal might increase pregnancy rates for frozen-thawed blastocysts. (Reprod Med Biol 2006; 5: 263-267).
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Affiliation(s)
| | | | | | - Yasuhiro Udagawa
- Department of Obstetrics and Gynecology, Fujita Health University School of Medicine, Aichi, Japan
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10
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Yae K, Keng VW, Koike M, Yusa K, Kouno M, Uno Y, Kondoh G, Gotow T, Uchiyama Y, Horie K, Takeda J. Sleeping beauty transposon-based phenotypic analysis of mice: lack of Arpc3 results in defective trophoblast outgrowth. Mol Cell Biol 2006; 26:6185-96. [PMID: 16880528 PMCID: PMC1592801 DOI: 10.1128/mcb.00018-06] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The Sleeping Beauty (SB) transposon system has generated many transposon-insertional mutant mouse lines, some of which have resulted in embryonic lethality when bred to homozygosity. Here we report one such insertion mapped to the mouse actin-related protein complex subunit 3 gene (Arpc3). Arpc3 is a component of the Arp2/3 complex, which plays a major role in actin nucleation with Y-shaped branching from the mother actin filament in response to migration signaling. Arpc3 transposon-inserted mutants developed only to the blastocyst stage. In vitro blastocyst culture of Arpc3 mutants exhibited severe spreading impairment of trophoblasts. This phenotype was also observed in compound heterozygotes generated using conventional gene-targeted and transposon-inserted alleles. Arpc3-deficient mutants were shown to lack actin-rich structures in the spreading trophoblast. Electron microscopic analysis demonstrated the lack of mesh-like structures at the cell periphery, suggesting a role of Arpc3 in Y-shaped branching formation. These data indicate the importance of Arpc3 in the Arp2/3 complex for trophoblast outgrowth and suggest that Arpc3 may be indispensable for implantation.
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Affiliation(s)
- Kojiro Yae
- Department of Social and Environmental Medicine H3, Osaka University, Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
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11
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Jelinkova L, Pavelkova J, Strehler E, Paulus W, Zivny J, Sterzik K. Improved implantation rate after chemical removal of the zona pellucida. Fertil Steril 2003; 79:1299-303. [PMID: 12798874 DOI: 10.1016/s0015-0282(03)00260-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To evaluate the implantation rate achieved after chemical removal of the zona pellucida from day 5 human in vitro-derived embryos. DESIGN Prospective, randomized, controlled study. SETTING A tertiary care infertility clinic. PATIENT(S) Two hundred fifty-seven patients undergoing IVF with transfer of morulas or blastocysts on day 5 after oocyte retrieval. All patients had had at least two previous implantation failures. INTERVENTION(S) Chemical removal of zona pellucida by using acidic Tyrode's solution vs. no removal (controls). MAIN OUTCOME MEASURES Clinical pregnancy rate and implantation rate per transfer. RESULT(S) Embryos without zona pellucida implanted at nearly twice the rate of control embryos (15.7% vs. 27.5%). The pregnancy rate was also significantly higher in the zona pellucida-free group than the control group (31.0% vs. 46.1%). Removal of zona pellucida was most effective in embryos with delayed development, which reached the morula or early cavitating stage on day 5 of in vitro culture (implantation rate, 12.1% vs. 25.7%). CONCLUSION(S) Chemical removal of zona pellucida from day 5 in vitro cultured human embryos is an effective and safe method of significantly improving the implantation rate, especially of embryos with delayed development.
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Affiliation(s)
- Ladislava Jelinkova
- Gynecology and Obstetrics Department and General Faculty Hospital, Charles University, Prague, Czech Republic.
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12
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Xu JS, Cheung TM, Chan ST, Ho PC, Yeung WS. Temporal effect of human oviductal cell and its derived embryotrophic factors on mouse embryo development. Biol Reprod 2001; 65:1481-8. [PMID: 11673265 DOI: 10.1095/biolreprod65.5.1481] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Mouse embryos at different stages of development were cocultured with human oviduct cells or cultured in the presence of oviduct-derived embryotrophic factor-1, -2, and -3 (ETF-1, -2, and -3) for various amounts of time within the preimplantation period. Cocultures that included the period from 48 to 72 h post-hCG stimulated cell division and increased the cell numbers in the inner cell mass (ICM) of the exposed blastocyst. Exposure of embryos to oviductal cells from 96 to 120 h post-hCG increased the cell number in the trophectoderm (TE), blastocyst size, hatching rate, attachment, and in vitro spreading of the blastocyst. ETF-1 and ETF-2 affected embryos between 48 and 72 h post-hCG by increasing the number of cells in the ICM. In contrast, ETF-3 had a more profound effect on embryos that were exposed from 96 to 120 h post-hCG, where it mostly affected the development of TE cells, leading to higher hatching rate. Human oviductal cells improved mouse embryo development partly by the production of high molecular weight embryotrophic factors. These factors had differential effects on mouse embryo development.
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Affiliation(s)
- J S Xu
- Department of Obstetrics and Gynaecology, University of Hong Kong, Hong Kong, China
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NIIMURA S, WAKASA R. Hatching and Contraction in Mouse Blastocysts Treated with Cytochalasin B. J Reprod Dev 2001. [DOI: 10.1262/jrd.47.317] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | - Ryoko WAKASA
- Graduate School of Science and Technology, Niigata University
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