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Open research questions in Reproductive Biology and Fertility

863 gap statements mined from Reproductive Biology and Fertility papers in our 7.9M-paper local library, which holds 4,289 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 need for strategies to mitigate ovarian damage while maintaining anti-tumour efficacy. The lack of understanding of the mechanisms underlying GnRH antagonist-induced ovarian suppression.

    GnRH antagonist-induced ovarian suppression does not protect the ovarian reserve from cyclophosphamide chemotherapy in tumour-bearing mice · 2026 · DOI

  • The current understanding of the relationship between trigger-day progesterone and IVF/ICSI outcomes is limited. Prior studies have reported conflicting findings, and the impact of high progesterone levels on embryo quality and pregnancy rates is not fully understood. There is a need for further research to clarify this relationship and optimize IVF/ICSI protocols.

    Trigger-day progesterone-to-mature-oocyte ratio, cycle-level blastocyst yield, and recorded embryo-transfer outcomes: a retrospective cohort study · 2026 · DOI

  • The mechanisms underlying the protective effects of pterostilbene on VCD-induced ovarian damage are not fully understood. The combination effect of pterostilbene and 17β-estradiol on VCD-induced ovarian damage has not been investigated.

    Pterostilbene attenuates VCD-induced ovarian damage through modulation of oxidative stress, inflammation, apoptosis, and SIRT1/FOXO3a gene expression · 2026 · DOI

  • The need for a more effective vitrification method that can reduce the negative effects on oocyte parameters. The gap in the current understanding of the optimal vitrification/warming system.

    Ultra-Fast Vitrification: Minimizing the Toxicity of Cryoprotective Agents and Osmotic Stress in Mouse Oocyte Cryopreservation · 2024 · DOI

  • The effects of ffEVs on equine oocytes have not been previously observed. There is a lack of understanding of how ffEVs influence cumulus cell expansion and viability in equines.

    Follicular Fluid-Derived Extracellular Vesicles Influence on In Vitro Maturation of Equine Oocyte: Impact on Cumulus Cell Viability, Expansion and Transcriptome · 2024 · DOI

  • Reproductive aging in females is characterized by the irreversible depletion of ovarian follicles, yet the structure and function of the post-reproductive ovary remain poorly defined.

    The post-reproductive ovary shifts from a reproductive to an immune-like organ · 2026 · DOI

  • Growing epidemiological evidence suggests that reproductive tract infections may represent a previously underappreciated risk factor for POI development, although the underlying mechanisms remain unclear.

    Vaginal Escherichia coli infection impairs ovarian homeostasis: phenotypic characterization and mechanistic insights · 2026 · DOI

  • The lack of standardised and objective evaluation criteria continues to limit the efficiency, reproducibility, and translational value of porcine assisted reproductive technologies (ART).

    Integrative assessment of gamete and embryo quality in porcine in vitro production: A comprehensive review · 2026 · DOI

  • However, these mechanisms are not fully characterized in bovine embryos, and biological pathways are not always conserved across species.

    Pharmacological mTOR pathway activation does not enhance trophectoderm differentiation in bovine embryos · 2026 · DOI

  • The significance of maintaining this homogeneous state in mammals remains unclear.

    Elevated cortical tension triggers precocious ectopic polarization in mammalian oocytes, associated with lower developmental potential. · 2026 · DOI

  • The findings are limited to pure chromosome 21 aneuploidies; therefore, further studies including aneuploidies affecting other chromosomes are warranted to assess the generalizability of the results.

    Mapping developmental and targeted secretory signatures of euploid and aneuploid human embryos using an advanced endometrial model · 2026 · DOI

  • However, how embryo chromosomal status influences implantation dynamics and embryo–endometrial interactions remain poorly understood.

    Mapping developmental and targeted secretory signatures of euploid and aneuploid human embryos using an advanced endometrial model · 2026 · DOI

  • N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine-quinone (6PPD-Q) is a ubiquitous tire-derived transformation product with emerging reproductive toxicity; however, its impact on mammalian oocytes and the potential protective role of melatonin (MT) remain unclear.

    Melatonin Protects Mouse Oocytes From the Environmental Toxicant 6PPD‐Quinone by Preserving Mitochondrial and Endomembrane Homeostasis · 2026 · DOI

  • Sleep disturbance perturbs circadian and immune homeostasis and is increasingly associated with female reproductive dysfunction, yet the underlying cellular mechanisms remain unclear.

    Melatonin Alleviates Sleep Disturbance‐Induced Ovarian Reserve Decline by Suppressing NLRP3‐Mediated Pyroptosis in Granulosa Cells · 2026 · DOI

  • We have recently demonstrated that COH increases circulating ghrelin; however, its role in COH-induced alterations and the potential therapeutic impact of its inhibition remain unclear.

    Ghrelin impairs embryo development after ovarian hyperstimulation · 2026 · DOI

  • While the upstream activation cascade of TAp63α has been well characterized, the mechanisms that regulate its stability during the DNA damage response remain incompletely understood.

    HIPK2-and IKKβ-dependent phosphorylation stabilizes TAp63α during the oocyte DNA damage response · 2026 · DOI

  • Cytosolic Ca²⁺ oscillations initiate egg activation and couple Ca²⁺ signalling to mitochondrial metabolism, yet how IVF media shape this Ca²⁺-metabolic response remains poorly understood.

    IVF media shape PLCζ-dependent Ca²⁺ oscillatory excitability and developmental potential at fertilization · 2026 · DOI

  • Further studies are needed to investigate the effects of GnRH antagonists in different contexts. Research should be conducted to compare the effects of GnRH antagonists with GnRH agonists. Studies should be done to explore the underlying mechanisms of GnRH antagonist-induced ovarian suppression.

    GnRH antagonist-induced ovarian suppression does not protect the ovarian reserve from cyclophosphamide chemotherapy in tumour-bearing mice · 2026 · DOI

  • However, its effects on Premature ovarian failure (POF) and the underlying mechanisms remain unclear.

    Dingkun Pill attenuates oxidative stress, autophagy, and apoptosis to alleviate cyclophosphamide-induced premature ovarian failure in rats via activation of the PI3K/AKT/mTOR signaling pathway · 2026 · DOI

  • Maternal exercise is widely regarded as beneficial for metabolic homeostasis and pregnancy outcomes; however, whether different exercise intensities are associated with distinct patterns of fetal ovarian development remains unclear.

    Effects of maternal exercise intensity during pregnancy on fetal ovarian development in mice · 2026 · DOI

  • Stress-induced oxidative stress and cumulus cell apoptosis - Limited understanding of the mechanisms underlying melatonin's protective effects - Difficulty in translating findings from animal models to human reproductive…

    Melatonin Ameliorates Stress-Induced Oocyte Developmental Impairment: Evidence from In Vivo and In Vitro Models · 2026 · DOI

  • Investigate the effects of MT on human oocytes, - Examine the long-term effects of MT supplementation, - Explore the mechanisms underlying MT's protective effects…

    Melatonin Ameliorates Stress-Induced Oocyte Developmental Impairment: Evidence from In Vivo and In Vitro Models · 2026 · DOI

  • The study used a rat model, - The sample size was limited to 30 female Sprague-Dawley rats, - The study did not investigate the long-term effects of pterostilbene…

    Pterostilbene attenuates VCD-induced ovarian damage through modulation of oxidative stress, inflammation, apoptosis, and SIRT1/FOXO3a gene expression · 2026 · DOI

  • The precise functions and chemical processes of antioxidants and their complex interplay with ROS are still unclear, - Reduced efficacy in antioxidant systems is linked to age-related declines in fertility, - Inherent variables that cause DNA fragmentation include defective chromatin packing and premature…

    Impact of Reductive Stress on Human Infertility: Underlying Mechanisms and Perspectives · 2024 · DOI

  • Future research to determine whether antioxidant supplements can prevent reproduction-related disorders, - Further research to optimize the use of antioxidants in fertility treatments, - Research to support reproductive health to avoid adverse…

    Impact of Reductive Stress on Human Infertility: Underlying Mechanisms and Perspectives · 2024 · DOI

Most-cited papers in Reproductive Biology and Fertility

Most recent work

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Open questions raised by papers listed on this page include: (1) The lack of understanding of the mechanisms underlying GnRH antagonist-induced ovarian suppression (“GnRH antagonist-induced ovarian suppression does not protect the ovarian…”, 2026); (2) Prior studies have reported conflicting findings, and the impact of high progesterone levels on embryo quality and pregnancy rates is not fully understood (“Trigger-day progesterone-to-mature-oocyte ratio, cycle-level blastocyst yield,…”, 2026); (3) The mechanisms underlying the protective effects of pterostilbene on VCD-induced ovarian damage are not fully understood (“Pterostilbene attenuates VCD-induced ovarian damage through modulation of…”, 2026); (4) Growing epidemiological evidence suggests that reproductive tract infections may represent a previously underappreciated risk factor for POI development, although the underlying mechanisms remain unclear (“Vaginal Escherichia coli infection impairs ovarian homeostasis: phenotypic…”, 2026); (5) The lack of standardised and objective evaluation criteria continues to limit the efficiency, reproducibility, and translational value of porcine assisted reproductive technologies (ART) (“Integrative assessment of gamete and embryo quality in porcine in vitro…”, 2026). 863 gap statements have been mined from Reproductive Biology and Fertility papers in our 7.9M-paper local library, which holds 4,289 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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