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Perinatal photoperiod imprints the circadian clock
Christopher M Ciarleglio1, John C Axley, Benjamin R Strauss
1Neuroscience Graduate Program, Vanderbilt University, Nashville, Tennessee, USA.
Nature Neuroscience
|December 7, 2010
Summary
Early life light exposure permanently alters mouse circadian rhythms and behavior. This developmental programming influences how the biological clock responds to seasonal changes, impacting neurobehavioral health.
Area of Science:
- Neuroscience
- Chronobiology
- Developmental Biology
Background:
- Circadian rhythms are endogenous biological processes that regulate daily cycles.
- Environmental factors, such as light, play a crucial role in synchronizing circadian rhythms.
- The impact of early-life environmental exposures on long-term circadian function is not fully understood.
Purpose of the Study:
- To investigate the lasting effects of perinatal photoperiod on circadian rhythms and behavior in mice.
- To determine how early-life photoperiod influences the responsiveness of the biological clock to subsequent environmental changes.
- To explore the potential role of developmental gene × environment interactions in seasonal influences on neurobehavioral disorders.
Main Methods:
- Real-time gene expression imaging in clock neurons.
- Comprehensive behavioral analysis in mice.
- Controlled manipulation of photoperiod during the perinatal period.
Main Results:
- Perinatal photoperiod exposure resulted in long-lasting alterations in circadian rhythms of clock neurons.
- Early-life light conditions significantly affected mouse behavior.
- The perinatal photoperiod determined the sensitivity of the biological clock to later photoperiod shifts.
- Evidence of developmental gene × environment interactions tuning circadian clock responses to seasonal photoperiods was observed.
Conclusions:
- Early-life photoperiod is a critical determinant of adult circadian clock function and behavior.
- Developmental programming by light influences the adaptive capacity of the biological clock to seasonal changes.
- These findings suggest a mechanism linking seasonal influences to neurobehavioral disorders in humans.
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