Melatonin abnormalities
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Melatonin Abnormalities: Circadian Rhythm and Sleep Disorders
Melatonin is a hormone produced mainly by the pineal gland at night, playing a key role in regulating circadian rhythms and sleep-wake cycles. Abnormalities in melatonin production or signaling can disrupt these rhythms, leading to various sleep disorders and health issues. Melatonin abnormalities are often linked to impaired synchronization of the body’s internal clock with the external environment, resulting in sleep disturbances and other physiological problems Cipolla-Neto2018Xie2017Socaciu2020+1 MORE.
Melatonin Deficiency and Sleep Disorders
Low melatonin levels are commonly associated with sleep disorders such as insomnia, circadian rhythm sleep-wake disorders, and parasomnias. Supplementing with melatonin or using melatonin receptor agonists can help restore normal sleep patterns and improve sleep quality, offering a safer alternative to traditional sleep medications Xie2017Liu2016Ribeiro2025. In rare genetic neurodevelopmental disorders (RGND), such as Smith-Magenis syndrome and Angelman syndrome, abnormal melatonin secretion is linked to significant sleep problems, particularly dyssomnias, with low nocturnal melatonin levels frequently reported .
Melatonin Abnormalities in Neurodevelopmental and Psychiatric Disorders
Autism Spectrum Disorders and Genetic Factors
Individuals with autism spectrum disorders (ASD) often exhibit low melatonin levels, which have been traced to genetic abnormalities affecting the ASMT gene, responsible for the final step in melatonin synthesis. Mutations and promoter polymorphisms in ASMT are more common in ASD, leading to reduced enzyme activity and melatonin production. This deficiency is considered a risk factor for ASD and may contribute to the behavioral and cognitive symptoms observed in these individuals Feybesse2023Melke2007.
Broader Neurodevelopmental and Psychiatric Implications
Melatonin abnormalities are also implicated in other neurodevelopmental disorders, including Rett syndrome, Tuberous sclerosis, Williams-Beuren syndrome, bipolar disorder, and schizophrenia. In these conditions, impaired melatonin production and disrupted circadian rhythms are linked to overlapping symptoms such as sleep disturbances and behavioral issues, highlighting the importance of melatonin in neurodevelopment and mental health Feybesse2023Woodford2021.
Melatonin and Neurodegenerative Diseases
Alzheimer’s Disease and Circadian Disruption
Melatonin levels naturally decline with age, and this reduction is more pronounced in neurodegenerative diseases like Alzheimer’s disease (AD). Melatonin helps regulate clock genes and protects against the accumulation of toxic proteins such as amyloid-beta and tau, which are central to AD pathology. Abnormal melatonin signaling contributes to circadian disruption, cognitive decline, and neurodegeneration. Restoring melatonin levels or signaling may help mitigate these effects and slow disease progression Hossain2019Socaciu2020Shen2022+1 MORE.
Metabolic and Systemic Effects of Melatonin Abnormalities
Melatonin is also involved in metabolic regulation, immune function, and protection against oxidative stress. Abnormal melatonin levels are observed in metabolic disorders such as type 2 diabetes mellitus, where they are associated with increased inflammation, insulin resistance, and a higher risk of neurodegenerative diseases. Enhancing melatonin signaling can improve metabolic health and reduce the risk of related complications Socaciu2020Shen2022.
Therapeutic Implications and Future Directions
Understanding melatonin abnormalities has led to the development of melatonin-based therapies and synthetic analogs targeting its receptors (MT1 and MT2). These treatments are effective for sleep and circadian rhythm disorders, mood disorders, and may have potential in neurodegenerative and metabolic diseases. Ongoing research aims to develop more selective and effective melatonin receptor modulators for broader clinical use Liu2016Ribeiro2025.
Conclusion
Melatonin abnormalities are linked to a wide range of disorders, from sleep and circadian rhythm disturbances to neurodevelopmental, psychiatric, neurodegenerative, and metabolic diseases. Addressing these abnormalities through targeted therapies holds promise for improving health outcomes across diverse conditions Cipolla-Neto2018Feybesse2023Woodford2021+7 MORE.
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