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Pineal melatonin rhythms and the timing of puberty in mammals

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Summary

The direction of change in daylength provides the seasonal time cue for the timing of puberty in many mammalian species. The pattern of melatonin secretion from the pineal gland transduces the environmental light-dark cycle into a signal influencing the neuroendocrine control of sexual maturation. The change in duration of nocturnal melatonin secretion is probably the key feature of the melatonin signal which conveys daylength information. This information may also be used by neuroendocrine axes controlling seasonal changes in pelage colour, growth and metabolism. The mechanism of action of melatonin on neuroendocrine pathways is unknow. Although the ability to synthesize and secrete melatonin in a pattern that reflects the duration of the night may not occur until the postnatal period, the rodent and ovine foetus has the ability to respond in utero to photoperiodic cues to which its mother is exposed in late gestation. Transplacental passage of maternal melatonin is likely to be the mechanism by which photoperiodic cues reach the foetus. Species which do not exhibit seasonal patterns of puberty, such as the human, also secrete melatonin in a pattern which reflects the environmental light-dark cycle, but they do not respond reproductively to the seasonal melatonin information.

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  1. Reproductive Sciences Program, The University of Michigan, 300 North Ingalls Building, 48109-0404, Ann Arbor, Michigan, USA

    F. J. P. Ebling & D. L. Foster

  2. Department of Obstetrics and Gynecology, The University of Michigan, 300 North Ingalls Building, 48109-0404, Ann Arbor, Michigan, USA

    F. J. P. Ebling & D. L. Foster

  3. Department of Biology, The University of Michigan, 300 North Ingalls Building, 48109-0404, Ann Arbor, Michigan, USA

    F. J. P. Ebling & D. L. Foster

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Ebling, F.J.P., Foster, D.L. Pineal melatonin rhythms and the timing of puberty in mammals. Experientia 45, 946–954 (1989). https://doi.org/10.1007/BF01953052

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