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A fresh start for IVM: capacitating the oocyte for development using pre-IVM

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dc.contributor.author Gilchrist, RB
dc.contributor.author Ho, TM
dc.contributor.author De Vos, M
dc.contributor.author Sanchez, F
dc.contributor.author Romero Loyola, Sergio Jean Markos
dc.contributor.author Ledger, WL
dc.contributor.author Anckaert, E
dc.contributor.author Vuong, LN
dc.contributor.author Smitz, J
dc.date.accessioned 2023-10-12T15:30:09Z
dc.date.available 2023-10-12T15:30:09Z
dc.date.issued 2023
dc.identifier.uri https://hdl.handle.net/20.500.12866/14300
dc.description.abstract BACKGROUND: While oocyte IVM is practiced sporadically it has not achieved widespread clinical practice globally. However, recently there have been some seminal advances in our understanding of basic aspects of oocyte biology and ovulation from animal studies that have led to novel approaches to IVM. A significant recent advance in IVM technology is the use of biphasic IVM approaches. These involve the collection of immature oocytes from small antral follicles from minimally stimulated patients/animals (without hCG-priming) and an similar to 24 h pre-culture of oocytes in an advanced culture system ('pre-IVM') prior to IVM, followed by routine IVF procedures. If safe and efficacious, this novel procedure may stand to make a significant impact on human ART practices. OBJECTIVE AND RATIONALE: The objectives of this review are to examine the major scientific advances in ovarian biology with a unique focus on the development of pre-IVM methodologies, to provide an insight into biphasic IVM procedures, and to report on outcomes from animal and clinical human data, including safety data. The potential future impact of biphasic IVM on ART practice is discussed. SEARCH METHODS: Peer review original and review articles were selected from PubMed and Web of Science searches for this narrative review. Searches were performed using the following keywords: oocyte IVM, pre-IVM, biphasic IVM, CAPA-IVM, hCG-triggered/primed IVM, natural cycle IVF/M, ex-vivo IVM, OTO-IVM, oocyte maturation, meiotic competence, oocyte developmental competence, oocyte capacitation, follicle size, cumulus cell (CC), granulosa cell, COC, gap-junction communication, trans-zonal process, cAMP and IVM, cGMP and IVM, CNP and IVM, EGF-like peptide and IVM, minimal stimulation ART, PCOS. OUTCOMES: Minimizing gonadotrophin use means IVM oocytes will be collected from small antral (pre-dominant) follicles containing oocytes that are still developing. Standard IVM yields suboptimal clinical outcomes using such oocytes, whereas pre-IVM aims to continue the oocyte's development ex vivo, prior to IVM. Pre-IVM achieves this by eliciting profound cellular changes in the oocyte's CCs, which continue to meet the oocyte's developmental needs during the pre-IVM phase. The literature contains 25 years of animal research on various pre-IVM and biphasic IVM procedures, which serves as a large knowledge base for new approaches to human IVM. A pre-IVM procedure based on c-type natriuretic peptide (named 'capacitation-IVM' (CAPA-IVM)) has undergone pre-clinical human safety and efficacy trials and its adoption into clinical practice resulted in healthy live birth rates not different from conventional IVF. WIDER IMPLICATIONS: Over many decades, improvements in clinical IVM have been gradual and incremental but there has likely been a turning of the tide in the past few years, with landmark discoveries in animal oocyte biology finally making their way into clinical practice leading to improved outcomes for patients. Demonstration of favorable clinical results with CAPA-IVM, as the first clinically tested biphasic IVM system, has led to renewed interest in IVM as an alternative, low-intervention, low-cost, safe, patientfriendly ART approach, and especially for patients with PCOS. The same new approach is being used as part of fertility preservation in patients with cancer and holds promise for social oocyte freezing. en_US
dc.language.iso eng
dc.publisher Oxford University Press
dc.relation.ispartofseries Human Reproduction Update
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject Pre-maturation en_US
dc.subject Biphasic IVM en_US
dc.subject Capacitation IVM en_US
dc.subject Oocyte developmental competence en_US
dc.subject Minimal stimulation en_US
dc.subject IVM en_US
dc.subject.mesh Modificación Traduccional de las Proteínas
dc.subject.mesh Insulinas Bifásicas
dc.subject.mesh Técnicas In Vitro
dc.subject.mesh Oocitos
dc.title A fresh start for IVM: capacitating the oocyte for development using pre-IVM en_US
dc.type info:eu-repo/semantics/review
dc.identifier.doi https://doi.org/10.1093/humupd/dmad023
dc.relation.issn 1460-2369


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