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Open research questions in Reproductive System and Pregnancy

530 gap statements mined from Reproductive System and Pregnancy papers in our 7.9M-paper local library, which holds 1,892 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The authors highlight the need to develop effective strategies to mitigate reproductive aging and improve fertility outcomes. The paper notes the challenge of translating the understanding of mitochondrial dysfunction into clinical applications to improve reproductive health.

    Endometrial Aging and Reproductive Decline: The Central Role of Mitochondrial Dysfunction · 2025 · DOI

  • One challenge is the ethical constraint of studying early human implantation. Another challenge is the complexity of the implantation process, involving several molecular steps. The authors also highlight the need for more elaborated in vitro models that include stromal cells.

    Changes in Epithelial Cell Polarity and Adhesion Guide Human Endometrial Receptivity: How In Vitro Systems Help to Untangle Mechanistic Details · 2025 · DOI

  • However, how these pathways integrate to regulate the mechanical properties of the endometrium remains unclear.

    How decidualization dysregulation reshapes the nanomechanics of endometrial stromal cells · 2026 · DOI

  • Despite this temporal association, placental contributions to RPL pathogenesis remain poorly understood.

    Functional heterogeneity in trophoblast stem cells derived from recurrent pregnancy loss products of conception · 2026 · DOI

  • Heparin, which is widely used as an anticoagulant, has also been recognized as possessing anti-inflammatory properties; however, its role in inflammation-driven pregnancy complications remains unclear.

    Heparin prevents inflammation-induced pregnancy loss in mice through its anti-inflammatory effects · 2026 · DOI

  • Although cell-cell junctions have been shown to play a role in the establishment of endometrial receptivity, data on their role in the invasion process are lacking.

    Heterologous cell–cell junctions support transepithelial endometrial trophoblast invasion in human · 2026 · DOI

  • Pregnancy requires balanced maternal immune regulation for healthy fetal development, in which γδT cells contribute at the feto‐maternal interface; however, mechanisms guiding decidual γδT‐cell accumulation remain unclear.

    Highly Conserved but Activation‐Dependent CCR5, CCR6, and CXCR4 Chemokine Receptor Expression and Trophoblast‐Mediated Cytokine Profile of Peripheral Gamma‐Delta T Cells During Early Human Pregnancy · 2026 · DOI

  • Although the role of progesterone (P4) in maintaining pregnancy is well known, its anti-inflammatory effects in immune-mediated pregnancy complications remain poorly understood.

    Prophylactic treatment with progesterone decreases murine miscarriage by suppressing the immunostimulatory activity of macrophages · 2025 · DOI

  • Controlled ovarian hyperstimulation (COH) is a cornerstone of assisted reproductive technologies, yet its effects on endometrial function and embryo implantation remain poorly understood, particularly regarding the role of hypoxia-inducible factor 2α (HIF-2α) signaling.

    Controlled ovarian hyperstimulation reduces mouse embryo implantation capacity through uterine HIF-2α mediated pathway · 2025 · DOI

  • Implantation failure and early placental dysfunction are major contributors, yet the precise mechanisms remain incompletely understood.

    Kisspeptin and early pregnancy: Insights from animal models into hormonal regulation and miscarriage · 2025 · DOI

  • Insulin resistance has been clinically linked to RPL, but mechanisms at the maternal-fetal interface remain unclear.

    Insulin resistance and SIK1 hyperactivation: implications for vascular remodeling in recurrent pregnancy loss · 2025 · DOI

  • However, the mechanisms by which decidual macrophages are involved in the occurrence of adverse pregnancy outcomes have not been elucidated.

    Upregulation of GPR133 expression impaired the phagocytosis of macrophages in recurrent spontaneous miscarriage · 2024 · DOI

  • The impaired endometrial receptivity is a major factor contributing to infertility in patients with endometriosis (EM), but the underlying mechanism remains unclear.

    Loss of KLF15 impairs endometrial receptivity by inhibiting EMT in endometriosis · 2024 · DOI

  • The endometrium and decidua represent the uterine environments before and during pregnancy, respectively, yet the composition and phenotypic alterations of uterine CD8 + T cells in these tissues remain unclear.

    Decidualization-associated recruitment of cytotoxic memory CD8+T cells to the maternal-fetal interface for immune defense · 2024 · DOI

  • However, the involvement of primary cilia on spontaneous abortion and the underlying molecular mechanisms remains poorly understood.

    Primary cilia abnormalities participate in the occurrence of spontaneous abortion through TGF‐β/SMAD2/3 signaling pathway · 2024 · DOI

  • The etiology and mechanisms underlying SCH remain unclear. SCH is associated with increased risks of miscarriage, preterm birth, and other adverse pregnancy outcomes.

    LAMB1 regulates COL3A1 and RAC1 expression during subchorionic hemorrhage progression · 2026 · DOI

  • The etiology and mechanisms underlying SCH remain unclear. Prior studies have focused on the imaging description of SCH, with minimal exploration of its molecular mechanisms.

    LAMB1 regulates COL3A1 and RAC1 expression during subchorionic hemorrhage progression · 2026 · DOI

  • The study highlights the need for further research on the role of glutamine in implantation failure.

    Metabolic profiling of a polycystic ovary syndrome-like organoid model reveals the critical role of glutamine in local endometrial dysregulation related to implantation failure · 2026 · DOI

  • The mechanisms of immune rejection of the fetus are not fully understood. The role of membrane progesterone receptors in preventing immune rejection of the fetus is not fully understood.

    The Role of Membrane Progesterone Receptor Associated Proteins in Gynecological and Reproductive Disorders, and Cancers: An Editor’s Historical Perspective · 2026 · DOI

  • The proposed optimal timing of progesterone administration (immediately after egg release) to maximize PIBF-mediated protection during fetal-placental endometrial invasion has not been validated clinically; randomized trials comparing immediate post-ovulation progesterone supplementation with standard luteal-phase dosing in PIBF-responsive versus non-responsive populations are needed.

    The Role of Membrane Progesterone Receptor Associated Proteins in Gynecological and Reproductive Disorders, and Cancers: An Editor’s Historical Perspective · 2026 · DOI

  • There is a lack of robust biomarkers for endometrial receptivity. The clinical potential of BMI1 is undefined.

    The role of BMI1 in assessing endometrial receptivity and its clinical implications · 2026 · DOI

  • No prominent signaling pathways were identified between the IOFN and IOFC groups, the IOFC and IOFP groups, and the IOFN and IOFP groups, limiting understanding of pathway-level changes in inner ovarian fluid metabolites.

    Metabolic profiling of a polycystic ovary syndrome-like organoid model reveals the critical role of glutamine in local endometrial dysregulation related to implantation failure · 2026 · DOI

  • Elucidating the role of mitochondrial dysfunction in aging provides critical insights into the molecular basis of fertility decline, - Targeting mitophagy represents a promising strategy for improving fertility and mitigating reproductive…

    Endometrial Aging and Reproductive Decline: The Central Role of Mitochondrial Dysfunction · 2025 · DOI

  • Future research activities should focus on transepithelial trophoblast invasion, - Using spheroids created from stem cells or primary human trophoblast cells will improve the currently available in vitro models, - Artificial self-assembling embryo-like structures and three-dimensional endometrial explants and endometrial organoids should be used to improve in vitro…

    Changes in Epithelial Cell Polarity and Adhesion Guide Human Endometrial Receptivity: How In Vitro Systems Help to Untangle Mechanistic Details · 2025 · DOI

  • Our study fully elucidated the unique immunologic properties of uterine CD4 + T and CD8 + T cells and provided a base for further investigation of functions.

    CD4 + T and CD8 + T Cells in Uterus Exhibit Both Selective Dysfunction and Residency Signatures · 2024 · DOI

Most-cited papers in Reproductive System and Pregnancy

Most recent work

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Open questions raised by papers listed on this page include: (1) How these pathways integrate to regulate the mechanical properties of the endometrium remains unclear (“How decidualization dysregulation reshapes the nanomechanics of endometrial…”, 2026); (2) Despite this temporal association, placental contributions to RPL pathogenesis remain poorly understood (“Functional heterogeneity in trophoblast stem cells derived from recurrent…”, 2026); (3) Heparin, which is widely used as an anticoagulant, has also been recognized as possessing anti-inflammatory properties; however, its role in inflammation-driven pregnancy complications remains unclear (“Heparin prevents inflammation-induced pregnancy loss in mice through its…”, 2026); (4) Although cell-cell junctions have been shown to play a role in the establishment of endometrial receptivity, data on their role in the invasion process are lacking (“Heterologous cell–cell junctions support transepithelial endometrial…”, 2026); (5) Pregnancy requires balanced maternal immune regulation for healthy fetal development, in which γδT cells contribute at the feto‐maternal interface; however, mechanisms guiding decidual γδT‐cell accumulation remain unclear (“Highly Conserved but Activation‐Dependent CCR5, CCR6, and CXCR4 Chemokine…”, 2026). 530 gap statements have been mined from Reproductive System and Pregnancy papers in our 7.9M-paper local library, which holds 1,892 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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