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Logsdon DM, Ezashi T, Yuan Y. Enzymatic Digestion and Single Cell Isolation of Peri-implantation Stage Human Trophoblast Cells. Methods Mol Biol 2024; 2728:25-34. [PMID: 38019389 DOI: 10.1007/978-1-0716-3495-0_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Abstract
Recent developments in the in vitro culture of peri-implantation stage human embryos have expanded opportunities to investigate implantation stage human development and trophoblast differentiation in the absence of maternal tissues. Emerging single cell omics analyses have offered researchers new tools to explore unanswered biological questions to new depths. In order to investigate the dynamics of human trophoblast cell differentiation during implantation at the single-cell resolution, efficient cell dissociation approaches of trophoblasts from embryos are necessary. Here, we describe the protocol for extended culture of peri-implantation stage human embryos with enzymatic digestion and manual collection of individual cells for downstream assays.
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Affiliation(s)
| | - Toshihko Ezashi
- Colorado Centre for Reproductive Medicine, Lone Tree, CO, USA
| | - Ye Yuan
- Colorado Centre for Reproductive Medicine, Lone Tree, CO, USA.
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Logsdon DM, Churchwell A, Schoolcraft WB, Krisher RL, Yuan Y. Estrogen signaling encourages blastocyst development and implantation potential. J Assist Reprod Genet 2023; 40:1003-1014. [PMID: 37017886 PMCID: PMC10239412 DOI: 10.1007/s10815-023-02783-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Accepted: 03/21/2023] [Indexed: 04/06/2023] Open
Abstract
PURPOSE Estrogen is well-known for preparing uterine receptivity. However, its roles in regulating embryo development and implantation are unclear. Our objective was to characterize estrogen receptor 1 (ESR1) in human and mouse embryos and determine the effect of estradiol (E2) supplementation on pre- and peri-implantation blastocyst development. METHODS Mouse embryos, 8-cell through hatched blastocyst stages, and human embryonic days 5-7 blastocysts were stained for ESR1 and imaged using confocal microscopy. We then treated 8-cell mouse embryos with 8 nM E2 during in vitro culture (IVC) and examined embryo morphokinetics, blastocyst development, and cell allocation into the inner cell mass (ICM) and trophectoderm (TE). Finally, we disrupted ESR1, using ICI 182,780, and evaluated peri-implantation development. RESULTS ESR1 exhibits nuclear localization in early blastocysts followed by aggregation, predominantly in the TE of hatching and hatched blastocysts, in human and mouse embryos. During IVC, most E2 was absorbed by the mineral oil, and no effect on embryo development was found. When IVC was performed without an oil overlay, embryos treated with E2 exhibited increased blastocyst development and ICM:TE ratio. Additionally, embryos treated with ICI 182,780 had significantly decreased trophoblast outgrowth during extended embryo culture. CONCLUSION Similar ESR1 localization in mouse and human blastocysts suggests a conserved role in blastocyst development. These mechanisms may be underappreciated due to the use of mineral oil during conventional IVC. This work provides important context for how estrogenic toxicants may impact reproductive health and offers an avenue to further optimize human-assisted reproductive technology (ART) to treat infertility.
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Affiliation(s)
- Deirdre M. Logsdon
- Colorado Center for Reproductive Medicine, 10290 RidgeGate Circle, Lone Tree, CO 80124 USA
| | - Ashlyn Churchwell
- Colorado Center for Reproductive Medicine, 10290 RidgeGate Circle, Lone Tree, CO 80124 USA
| | - William B. Schoolcraft
- Colorado Center for Reproductive Medicine, 10290 RidgeGate Circle, Lone Tree, CO 80124 USA
| | | | - Ye Yuan
- Colorado Center for Reproductive Medicine, 10290 RidgeGate Circle, Lone Tree, CO 80124 USA
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Logsdon DM, Grimm CK, Schoolcraft WB, McCormick S, Schlenker T, Swain JE, Krisher RL, Yuan Y, Collins MG. Evaluation of the TMRW vapor phase cryostorage platform using reproductive specimens and in vitro extended human embryo culture. F S Sci 2022; 2:268-277. [PMID: 35560277 DOI: 10.1016/j.xfss.2021.06.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 06/28/2021] [Accepted: 06/30/2021] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To assess the impact of shipment and storage of sperm, oocytes, and blastocysts in vapor phase nitrogen compared with static storage in liquid phase nitrogen. DESIGN Prospective cohort-matched study. SETTING Multiple in vitro fertilization laboratories in an in vitro fertilization network. PATIENT(S) Fifty-eight human embryos, 32 human oocytes, 15 units of bovine semen. INTERVENTION(S) Vapor vs. liquid nitrogen. MAIN OUTCOME MEASURE(S) The postwarming survival of oocytes, sperm, and blastocysts, and the developmental potential of blastocysts during in vitro extended culture. RESULT(S) Custom-designed labware, for use with the TMRW platform, enables continuous temperature monitoring during shipment and/or storage in the vapor phase robotic storage system. The highest temperature recorded for specimens shipped to a domestic laboratory was -180.2 °C with a mean ± SD of -190.4 ± 0.5 °C during shipment and -181.1 ± 0.6 °C during storage. Likewise, specimens shipped internationally had a high of -180.2 °C with a mean ± SD of -193.5 ± 0.6 °C during shipment and -181.2 ± 0.7 °C during storage. Results from the extended culture assays have revealed no deleterious effect of shipment and storage in nitrogen vapor. The viability of mammalian gametes and embryos was equivalent between the vapor phase and liquid phase storage. CONCLUSION(S) The evaluated system did not have any deleterious effects on the postwarming survival of sperm, oocytes, and blastocysts. The postwarming developmental potential of human blastocysts during in vitro extended culture was unaffected by storage and handling in the vapor phase nitrogen TMRW platform when compared with static liquid phase nitrogen storage. Our results suggest that the vapor phase cryostorage platform is a safe system to handle and store reproductive specimens for human assisted reproductive technology.
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Affiliation(s)
- Deirdre M Logsdon
- Colorado Center for Reproductive Medicine-Colorado, Lone Tree, Colorado
| | - Courtney K Grimm
- Colorado Center for Reproductive Medicine-Colorado, Lone Tree, Colorado
| | | | - Sue McCormick
- Colorado Center for Reproductive Medicine-Colorado, Lone Tree, Colorado
| | - Terry Schlenker
- Colorado Center for Reproductive Medicine-Colorado, Lone Tree, Colorado
| | - Jason E Swain
- Colorado Center for Reproductive Medicine Fertility Network, Lone Tree, Colorado
| | - Rebecca L Krisher
- Colorado Center for Reproductive Medicine-Colorado, Lone Tree, Colorado
| | - Ye Yuan
- Colorado Center for Reproductive Medicine-Colorado, Lone Tree, Colorado
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Logsdon DM, Grimm CK, West RC, Engelhorn HJ, Kile R, Reed LC, Swain JE, Katz-Jaffe M, Schoolcraft WB, Krisher RL, Yuan Y. Maternal physiology and blastocyst morphology are correlated with an inherent difference in peri-implantation human embryo development. Fertil Steril 2022; 117:1311-1321. [DOI: 10.1016/j.fertnstert.2022.02.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 02/17/2022] [Accepted: 02/17/2022] [Indexed: 11/17/2022]
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Logsdon DM, Grimm CK, Schoolcraft WB, McCormick S, Swain JE, Krisher RL, Yuan Y, Collins MG. ASSESSMENT OF COMPLETE END TO END VAPOR PHASE NITROGEN SHIPPING AND STORAGE ON GAMETE AND BLASTOCYST QUALITY. Fertil Steril 2021. [DOI: 10.1016/j.fertnstert.2021.05.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rajput SK, Logsdon DM, Kile B, Engelhorn HJ, Goheen B, Khan S, Swain J, McCormick S, Schoolcraft WB, Yuan Y, Krisher RL. Human eggs, zygotes, and embryos express the receptor angiotensin 1-converting enzyme 2 and transmembrane serine protease 2 protein necessary for severe acute respiratory syndrome coronavirus 2 infection. F S Sci 2021; 2:33-42. [PMID: 33521687 PMCID: PMC7831752 DOI: 10.1016/j.xfss.2020.12.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 12/01/2020] [Accepted: 12/18/2020] [Indexed: 02/08/2023]
Abstract
OBJECTIVE To study messenger ribonucleic acid (mRNA) and protein expressions of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) entry receptors (angiotensin 1-converting enzyme 2 [ACE2] and CD147) and proteases (transmembrane serine protease 2 [TMPRSS2] and cathepsin L [CTSL]) in human oocytes, embryos, and cumulus (CCs) and granulosa cells (GCs). DESIGN Research study. SETTING Clinical in vitro fertilization (IVF) treatment center. PATIENTS Patients undergoing IVF were treated at the Colorado Center for Reproductive Medicine. INTERVENTIONS Oocytes (germinal vesicle and metaphase II [MII]) and embryos (1-cell [1C] and blastocyst [BL]) were donated for research at the disposition by the patients undergoing IVF. Follicular cells (CC and GC) were collected from women undergoing egg retrieval after ovarian stimulation without an ovulatory trigger for in vitro maturation/IVF treatment cycles. MAIN OUTCOME MEASURES Presence or absence of ACE2, CD147, TMPRSS2, and CTSL mRNAs detected using quantitative reverse transcription polymerase chain reaction and proteins detected using capillary Western blotting in human oocytes, embryos, and ovarian follicular cells. RESULTS The quantitative reverse transcription polymerase chain reaction analysis revealed high abundance of ACE2 gene transcripts in germinal vesicle and MII oocytes than in CC, GC, and BL. ACE2 protein was present only in the MII oocytes, and 1C and BL embryos, but other ACE2 protein variants were observed in all the samples. TMPRSS2 protein was present in all the samples, whereas mRNA was observed only in the BL stage. All the samples were positive for CD147 and CTSL mRNA expressions. However, CCs and GCs were the only samples that showed coexpression of both CD147 and CTSL proteins in low abundance. CONCLUSIONS CCs and GCs are the least susceptible to SARS-CoV-2 infection because of lack of the required combination of receptors and proteases (ACE2/TMPRSS2 or CD147/CTSL) in high abundance. The coexpression of ACE2 and TMPRSS2 proteins in the MII oocytes, zygotes, and BLs demonstrated that these gametes and embryos have the cellular machinery required and, thus, are potentially susceptible to SARS-CoV-2 infection if exposed to the virus. However, we do not know whether the infection occurs in vivo or in vitro in an assisted reproductive technology setting yet.
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Affiliation(s)
| | | | - Becca Kile
- Colorado Center for Reproductive Medicine, Lone Tree, Colorado
| | | | - Ben Goheen
- Colorado Center for Reproductive Medicine, Lone Tree, Colorado
| | - Shaihla Khan
- Colorado Center for Reproductive Medicine, Lone Tree, Colorado
| | - Jason Swain
- Colorado Center for Reproductive Medicine, Lone Tree, Colorado
| | - Sue McCormick
- Colorado Center for Reproductive Medicine, Lone Tree, Colorado
| | | | - Ye Yuan
- Colorado Center for Reproductive Medicine, Lone Tree, Colorado
| | - Rebecca L Krisher
- Colorado Center for Reproductive Medicine, Lone Tree, Colorado
- Genus PLC, DeForest, Wisconsin
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Logsdon DM, Ermisch AF, Herrick JR, Becker J, Yao L, Broeckling C, Schoolcraft WB, Krisher RL. Fatty acids present in commercial albumin preparations differentially affect development of murine embryos before and during implantation. F S Sci 2021; 2:50-58. [PMID: 35559764 DOI: 10.1016/j.xfss.2020.12.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 12/13/2020] [Accepted: 12/19/2020] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To characterize fatty acid (FA) profile of commercially available albumin products and determine their effect on embryonic development. DESIGN Research study. SETTING Private research facility. ANIMAL(S) Outbred mice aged 4-8 weeks. INTERVENTION(S) Gas chromatography-mass spectrometry was used to quantify the FA content of 15 commercial albumins. Embryos were produced in media containing different albumin products, with or without carnitine or exogenous FA supplementation, to determine their effect on embryo development in vitro. MAIN OUTCOME MEASURE(S) Total micrograms of FA per milligram of albumin for the 15 albumin products, blastocyst development, cell number, allocation to the trophectoderm (TE) or inner cell mass (ICM), and evaluation of morphology during implantation. RESULT(S) The albumin products contained 0.07-16.77 μg total FA/mg albumin. Compared to media with with >1.4 μg FA/mg albumin, media with <0.5 μg FA/mg albumin supported improved blastocyst development, and addition of carnitine mitigated this difference. Addition of palmitoleic acid or oleic acid individually did not improve blastocyst development and decreased ICM:TE ratio. However, in the presence of carnitine, there was improved blastocyst development and maintenance of the ICM:TE ratio. Embryos cultured in Vitrolife human serum albumin with supplementation of carnitine, palmitoleic acid, and oleic acid were more likely to develop cells positive for POU5F1 in an extended embryo culture than embryos cultured in Origio serum protein substitute. CONCLUSION(S) Commercial albumin products contain FAs, which vary in abundance. These FAs have different effects on embryo development and quality before and during the implantation stage. Several of these albumin preparations are routinely used for human-assisted reproductive technologies; therefore, serious consideration is warranted when selecting a product for clinical use.
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Affiliation(s)
| | - Alison F Ermisch
- Colorado Center for Reproductive Medicine, Lone Tree, Colorado; Department of Animal Science, University of Nebraska - Lincoln, Lincoln, Nebraska
| | - Jason R Herrick
- Colorado Center for Reproductive Medicine, Lone Tree, Colorado; Omaha's Henry Doorly Zoo and Aquarium, Omaha, Nebraska
| | - John Becker
- Colorado Center for Reproductive Medicine, Lone Tree, Colorado; CCRM Fertility San Francisco, Menlo Park, California
| | - Linxing Yao
- Colorado State University, Analytical Resources Core - Bioanalysis and Omics Center, Fort Collins, Colorado
| | - Corey Broeckling
- Colorado State University, Analytical Resources Core - Bioanalysis and Omics Center, Fort Collins, Colorado
| | | | - Rebecca L Krisher
- Colorado Center for Reproductive Medicine, Lone Tree, Colorado; Genus plc, DeForest, Wisconsin, USA
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Goheen BB, Rajput SK, Logsdon DM, Yuan Y, Jiang Z, Schoolcraft WB, Krisher RL. A REDUCED NUTRIENT CULTURE ENVIRONMENT IMPROVES BOVINE BLASTOCYST DEVELOPMENT AND ALTERS MITOCHONDRIAL METABOLISM AS ELUCIDATED BY SINGLE CELL RNA SEQUENCING. Fertil Steril 2020. [DOI: 10.1016/j.fertnstert.2020.08.1014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kile R, Logsdon DM, Nathanson C, McCormick S, Schoolcraft WB, Krisher RL. MITOCHONDRIAL SUPPORT OF EMBRYOS FROM WOMEN OF ADVANCED MATERNAL AGE DURING ART. Fertil Steril 2020. [DOI: 10.1016/j.fertnstert.2020.08.363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Logsdon DM, Rajput SK, Grimm CK, Schoolcraft WB, Yuan Y, Krisher RL. EXPOSURE OF HUMAN BLASTOCYSTS TO SPECIFIC GROWTH FACTORS BASED ON RECEPTOR PRESENCE IMPROVES EPIBLAST FORMATION IN EXTENDED EMBRYO CULTURE. Fertil Steril 2020. [DOI: 10.1016/j.fertnstert.2020.08.1045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Logsdon DM, West RC, Kile R, Grimm CK, Katz-Jaffe MG, McCormick S, Maruniak K, Schoolcraft WB, Krisher RL, Yuan Y. IN VITRO PERI-IMPLANTATION DEVELOPMENT OF GOOD QUALITY HUMAN EMBRYOS IS AFFECTED BY BLASTOCYST MORPHOLOGICAL GRADE AND MATERNAL AGE. Fertil Steril 2020. [DOI: 10.1016/j.fertnstert.2020.08.858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Khan SA, Logsdon DM, Engelhorn HJ, McCormick S, Schoolcraft WB, Krisher RL. DEFECTIVE MITOPHAGY IN EGGS FROM WOMEN OF ADVANCED MATERNAL AGE. Fertil Steril 2020. [DOI: 10.1016/j.fertnstert.2020.08.1036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Logsdon DM, Kile RA, Schoolcraft WB, Krisher RL, Yuan Y. Single Cell Collection of Trophoblast Cells in Peri-implantation Stage Human Embryos. J Vis Exp 2020. [PMID: 32597868 DOI: 10.3791/61476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Human implantation, the apposition and adhesion to the uterine surface epithelia and subsequent invasion of the blastocyst into the maternal decidua, is a critical yet enigmatic biological event that has been historically difficult to study due to technical and ethical limitations. Implantation is initiated by the development of the trophectoderm to early trophoblast and subsequent differentiation into distinct trophoblast sublineages. Aberrant early trophoblast differentiation may lead to implantation failure, placental pathologies, fetal abnormalities, and miscarriage. Recently, methods have been developed to allow human embryos to grow until day 13 post-fertilization in vitro in the absence of maternal tissues, a time-period that encompasses the implantation period in humans. This has given researchers the opportunity to investigate human implantation and recapitulate the dynamics of trophoblast differentiation during this critical period without confounding maternal influences and avoiding inherent obstacles to study early embryo differentiation events in vivo. To characterize different trophoblast sublineages during implantation, we have adopted existing two-dimensional (2D) extended culture methods and developed a procedure to enzymatically digest and isolate different types of trophoblast cells for downstream assays. Embryos cultured in 2D conditions have a relatively flattened morphology and may be suboptimal in modeling in vivo three-dimensional (3D) embryonic architectures. However, trophoblast differentiation seems to be less affected as demonstrated by anticipated morphology and gene expression changes over the course of extended culture. Different trophoblast sublineages, including cytotrophoblast, syncytiotrophoblast and migratory trophoblast can be separated by size, location, and temporal emergence, and used for further characterization or experimentation. Investigation of these early trophoblast cells may be instrumental in understanding human implantation, treating common placental pathologies, and mitigating the incidence of pregnancy loss.
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Affiliation(s)
| | | | | | | | - Ye Yuan
- Colorado Center for Reproductive Medicine;
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Logsdon DM, Ermisch AF, Kile R, Schoolcraft WB, Krisher RL, Yuan Y. Egg cylinder development during in vitro extended embryo culture predicts the post transfer developmental potential of mouse blastocysts. J Assist Reprod Genet 2020; 37:747-752. [PMID: 32072379 DOI: 10.1007/s10815-020-01714-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 02/06/2020] [Indexed: 11/24/2022] Open
Abstract
PURPOSE To establish parameters during mouse extended embryo culture that accurately predict fetal developmental potential of a blastocyst without performing embryo transfer. METHODS Embryos of three varying qualities were produced: poor quality embryos produced from in vitro matured oocytes (IVM), intermediate quality embryos produced from in vivo matured oocytes followed by in vitro fertilization and embryo culture (IVF); high quality embryos developed in vivo (VIVO). Embryonic day (E) 3.5 embryos from each group with similar morphologies were used for surgical embryo transfer to assess implantation and fetal developmental potential, in addition to placing these embryos into extended culture until E 8.5 to examine outgrowth area, egg cylinder volume, epiblast cell number, and outgrowth morphologies by immunofluorescence and 3D confocal microscopy. RESULTS The proportional differences in epiblast cell number are strikingly similar to fetal development following embryo transfer, suggesting that this parameter may be indicative of the potential of an embryo to successfully develop into a fetus. CONCLUSION Extended embryo culture provides more accurate information regarding developmental potential than blastocyst morphological assessment. Specifically, epiblast cell number is an accurate and valuable predictor of fetal developmental potential. This work sets the stage for routine evaluation of embryo quality past the time embryos would normally be transferred. The ability to determine post implantation potential without embryo transfer may greatly improve efforts to culture higher quality embryos in vitro for human IVF, as well as reducing animal use and eliminating confounding maternal factors associated with embryo transfer experiments in research.
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Affiliation(s)
| | | | - Rebecca Kile
- Colorado Center for Reproductive Medicine, Lone Tree, CO, USA
| | | | | | - Ye Yuan
- Colorado Center for Reproductive Medicine, Lone Tree, CO, USA.
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Becker J, Goheen BB, Logsdon DM, Rajput SK, Grimm CK, Schoolcraft WB, Krisher RL. Exploring new complex protein supplement solutions for clinical embryo culture media. Fertil Steril 2019. [DOI: 10.1016/j.fertnstert.2019.07.800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Krisher RL, Logsdon DM, Goheen BB, Rajput SK, Morgan TA, Schoolcraft WB, An R, Levine BA. Safe and efficient detection of egg maturity without cumulus cell removal by non-invasive tomography. Fertil Steril 2019. [DOI: 10.1016/j.fertnstert.2019.07.317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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