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Beyond maternal care: The effects of extra-maternal influences within the maternal environment on offspring
Samantha C Lauby1, Alison S Fleming2, Patrick O McGowan3
1Department of Biological Sciences, University of Toronto Scarborough Campus, Scarborough, ON, Canada; Department of Cell and Systems Biology, University of Toronto, Toronto, ON, Canada.
Insights
Early life experiences, including maternal care and environmental factors like temperature, significantly shape offspring neurodevelopment and behavior. Epigenetic mechanisms play a key role in these persistent developmental programming effects.
Area of Science:
- Neuroscience
- Developmental Biology
- Epigenetics
Background:
- Early-life environment profoundly impacts offspring neuroendocrine function, neurotransmitter systems, and behavior.
- Rodent models indicate maternal care influences offspring 'developmental programming' via epigenetic gene regulation.
- Understanding epigenetic regulation is crucial for adaptation and altered developmental trajectories.
Purpose of the Study:
- To discuss non-maternal factors influencing offspring developmental programming.
- To highlight early-life temperature variations and genotype x environment interactions as key influences.
- To provide recommendations for future research on early-life influences on brain and behavior.
Main Methods:
- Review of accumulating evidence, including the authors' research.
- Focus on epigenetic regulation as a biological mechanism.
- Analysis of genotype x environment interactions and temperature variations.
Main Results:
- Early-life maternal care is a significant factor in developmental programming.
- Non-maternal factors, such as temperature and genotype, also exert direct or interactive influences.
- These early-life factors lead to persistent changes in offspring brain and behavior.
Conclusions:
- Early-life maternal care and extra-maternal influences are critical for long-term neurodevelopmental outcomes.
- Future research should investigate the interplay of these factors.
- Understanding these mechanisms is key to addressing developmental alterations.
Abstract:
The early-life maternal environment has a profound and persistent effect on offspring neuroendocrine function, neurotransmitter systems, and behavior. Studies using rodent models suggest that early-life maternal care can influence the 'developmental programming' of offspring in part through altered epigenetic regulation of specific genes. The exploration of epigenetic regulation of these genes as a biological mechanism has been important to our understanding of how animals adapt to their environments and how these developmental trajectories may be altered. However, other non-maternal factors have been shown to act directly, or to interact with maternal care, to influence later-life phenotype. Based on accumulating evidence, including our research, we discuss other important influences on the developmental programming of offspring. We highlight early-life variations in temperature exposure and offspring genotype x environment interactions as prominent examples. We conclude with recommendations for future investigations on how early-life maternal care and extra-maternal influences lead to persistent changes in the brain and behavior of the offspring throughout development.
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