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Open research questions in Circadian rhythm and melatonin

839 gap statements mined from Circadian rhythm and melatonin papers in our 7.9M-paper local library, which holds 2,849 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

  • Future studies are needed to incorporate right ventricle ejection time to pulmonary artery acceleration time (RVET/PAAT) and shunt direction analysis for a more comprehensive evaluation of pulmonary hemodynamics.

    Melatonin effects on the left ventricular function in neonates with persistent pulmonary hypertension · 2026 · DOI

  • While important progress has been made in understanding the protective role of melatonin in horticulture crops under abiotic stress, several major areas remain unexplored and offer a promising research approach. Future research should focus on uncovering the tissue-specific expression and accumulation of melatonin across developmental stages and at varying stress intensities.

    Melatonin’s Role in Horticultural Crops Under Abiotic Stress: A Breakthrough and Crosstalk between Hormones and Genes · 2026 · DOI

  • A candidate EEG index of resting-state differentiation could potentially aid early detection of subclinical alterations in state regulation, but its utility as an early-detection marker remains to be validated.

    Longitudinal changes in resting-state EEG eyes-closed/open delta differentiation during an Antarctic expedition · 2026 · DOI

  • To the best of our knowledge, robust studies reporting consistent contradictory results regarding the anticancer properties of this indolamine are currently missing, which could partly reflect the scarcity of original clinical investigations specifically designed to address this question.

    Could the use of melatonin be a promising complementary strategy in the prevention of skin cancer? · 2026 · DOI

  • Future research should focus on: (1) testing the adipose-lipid axis hypothesis using tissue-specific interventions; (2) dissociating exercise timing from feeding timing in controlled human trials; and (3) evaluating whether the timing-dependent benefits observed in mice are reproducible in shift workers or other populations with circadian disruption.

    Time-Dependent Endurance Exercise Improves Metabolic Health Through Circadian Rhythm Regulation in Mice · 2026 · DOI

  • AAV9-mediated NPAS2 overexpression produced beneficial effects in vivo, the long-term efficacy, safety, and tissue specificity of this strategy remain to be established. First, although our data support a PDH-dependent function of NPAS2, the precise molecular mechanism by which NPAS2 regulates PDH activity remains incompletely understood.

    NPAS2 attenuates diabetic cardiomyopathy by preserving pyruvate dehydrogenase activity and mitochondrial metabolic homeostasis · 2026 · DOI

  • Several limitations of the present study should be acknowledged. Second, only a single dose of MT (20 mg/kg) was evaluated; therefore, dose–response relationships and the optimal dose of MT could not be determined. Therefore, caution is warranted when extrapolating these findings to the clinical setting.

    Protective effect of melatonin on intestinal mucosal injury in intermittent hypoxic rats · 2026 · DOI

  • Second, although our transcriptomic analyses suggest that Ccl5 is downstream from DBP, whether DBP binds directly to their regulatory regions remains to be determined.

    The clock‐output gene DBP regulates muscle insulin sensitivity and its fluctuations · 2026 · DOI

  • It highlights the need to identify biological pathways that recur across sleep phenotypes. The study also notes the importance of understanding the genetics of sleep-related phenotypes.

    CLEC1B and RAC1 in peripheral immune remodeling associated with sleep disturbance: an exploratory integrative study · 2026 · DOI

  • These include the variability in individual circadian profiles, lack of standardized biomarkers, and limited large-scale randomized trials evaluating chronotherapy and melatonin analogs in neurodegenerative populations.

    Molecular Links Between Circadian Rhythm Disruption, Melatonin, and Neurodegenerative Diseases: An Updated Review · 2025 · DOI

  • The precise mechanisms through which non-coding RNAs affect circadian rhythms remain unclear, necessitating additional research to clarify their roles and regulatory networks. Although extensively studied, the exact mechanisms governing tissue-specific regulation of circadian rhythms are not yet fully understood.

    Epigenetic Mechanisms in the Transcriptional Regulation of Circadian Rhythm in Mammals · 2025 · DOI

  • Although studies specifically examining the relationship between the training time, circadian rhythm, and sleep quality are scarce, these results are in line with similar studies carried out in shift workers.

    Melatonin Secretion and Impacts of Training and Match Schedules on Sleep Quality, Recovery, and Circadian Rhythms in Young Professional Football Players · 2025 · DOI

  • Another important limitation of this study is the imbalance in group sizes between the morning and evening groups. Lastly, core body temperature, a key factor in sleep onset and recovery, was not measured, warranting further investigation to understand its role in training-related circadian disruptions.

    Melatonin Secretion and Impacts of Training and Match Schedules on Sleep Quality, Recovery, and Circadian Rhythms in Young Professional Football Players · 2025 · DOI

  • Presently, research is limited to animal studies, and some debates persist, resulting in insufficient clinical evidence to support circadian rhythm regulation or Bmal1-targeted therapies for acute kidney injury and chronic kidney disease.

    Circadian Clock Gene Bmal1: A Molecular Bridge from AKI to CKD · 2025 · DOI

  • Although the physiology of mares’ ovulation was extensively studied during the pro‐ cess of deviation, knowledge is still lacking with respect to the role of circulating 5‐HT concentrations concerning pre‐ and post‐ovulatory phases, considering its correlation with immune cell responses.

    Involvement of Peripheral Serotonin in Blood Cells in Healthy Cyclical Mares of Different Ages · 2025 · DOI

  • These findings fill a critical gap in understanding how chronic circadian disruption impacts ocular health and suggest that ALA could offer a promising therapeutic strategy for mitigating CJL-induced damage.

    Chronic Jet Lag Disrupts Circadian Rhythms and Induces Hyperproliferation in Murine Lacrimal Glands via ROS Accumulation · 2025 · DOI

  • The involvement of mitochondrial sirtuins in circadian regulation, as well as their regulatory mechanisms, remains to be further explored. However, the roles of the mitochondrial sirtuins SIRT3, SIRT4, and SIRT5 in the circadian clock have not been studied.

    Interplay Between the Circadian Clock and Sirtuins · 2024 · DOI

  • Future research should prioritize clinical trials to establish the therapeutic efficacy and safety of melatonin in human individuals with thyroid disorders.

    Protective Effects of Melatonin against Carcinogen-Induced Oxidative Damage in the Thyroid · 2024 · DOI

  • Another concept that should be explored more is chronopharmacology since most targets for the treatment of MASLD (for example, thyroid hormone receptor, GLP-1, and FGF-21) are under circadian oscillation.

    Circadian Deregulation: Back Facing the Sun Toward Metabolic Dysfunction-Associated Steatotic Liver Disease (MASLD) Development · 2024 · DOI

  • MT has similar regulatory effects on plant growth, development, and metabolism as plant hormones such as auxin, cytokinin, gibberellin, and ethylene, including regulating cell expansion, root development, plant growth, fruit development, senescence, and responding to biotic and abiotic stresses.

    The Biosynthesis of Melatonin in Plants and the Mechanism of Its Influence on the Quality of Harvested Fruits · 2026 · DOI

  • This systematic review was conducted with the aim of providing an overview of the processes and strategies for the natural and controlled increase in melatonin content in cow’s milk.

    Nutritional and Technological Factors Influencing Melatonin Contents in Cow’s Milk: A Systematic Review · 2026 · DOI

  • While it is well understood that cortisol promotes changes favorable to cancer, such as the creation of adipose niches that protect cancer cells, it is also essential to explore other aspects.

    Impact of Modern Lifestyle on Circadian Health and Its Contribution to Adipogenesis and Cancer Risk · 2024 · DOI

  • These findings expand the current understanding of the anti‑GBM mechanisms of MT and support further investigation of the SIRT1/HMGB1/TLR4/NF‑κB axis as a potential therapeutic target.

    Melatonin exerts an in vitro anti‑glioblastoma effect through SIRT1‑mediated HMGB1 deacetylation and inhibition of the TLR4/NF‑κB pathway · 2026 · DOI

  • However, interorgan signaling mechanisms by which intestinal disease or stress regulate sleep have not yet been described κ Malita et al. Whereas the regulation of feeding behavior by this axis has been extensively studied, leading to revolutionary approaches to medical weight loss and diabetes control, the role of gut–brain signaling in regulating sleep – a behavior affected across nearly all mental illnesses…

    Glia-mediated gut–brain cytokine signaling couples sleep to intestinal inflammatory responses induced by oxidative stress · 2025 · DOI

  • Further studies on the dual regulation of MT and COR under arsenite…

    Sleep Deprivation and Subchronic Arsenite Exposure Synergistically Induced Skeletal Muscle Aging by Disrupting Melatonin and Cortisol Secretion in Mice · 2025 · DOI

Most-cited papers in Circadian rhythm and melatonin

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Open questions raised by papers listed on this page include: (1) Future studies are needed to incorporate right ventricle ejection time to pulmonary artery acceleration time (RVET/PAAT) and shunt direction analysis for a more comprehensive evaluation of pulmonary hemodynamics (“Melatonin effects on the left ventricular function in neonates with persistent…”, 2026); (2) While important progress has been made in understanding the protective role of melatonin in horticulture crops under abiotic stress, several major areas remain unexplored and offer a promising research approach (“Melatonin’s Role in Horticultural Crops Under Abiotic Stress: A Breakthrough…”, 2026); (3) A candidate EEG index of resting-state differentiation could potentially aid early detection of subclinical alterations in state regulation, but its utility as an early-detection marker remains to be validated (“Longitudinal changes in resting-state EEG eyes-closed/open delta…”, 2026); (4) AAV9-mediated NPAS2 overexpression produced beneficial effects in vivo, the long-term efficacy, safety, and tissue specificity of this strategy remain to be established (“NPAS2 attenuates diabetic cardiomyopathy by preserving pyruvate dehydrogenase…”, 2026); (5) These include the variability in individual circadian profiles, lack of standardized biomarkers, and limited large-scale randomized trials evaluating chronotherapy and melatonin analogs in neurodegenerative populations (“Molecular Links Between Circadian Rhythm Disruption, Melatonin, and…”, 2025). 839 gap statements have been mined from Circadian rhythm and melatonin papers in our 7.9M-paper local library, which holds 2,849 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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