This is the blog for GW students taking Human Evolutionary Genetics. This site is for posting interesting tidbits on: the patterns and processes of human genetic variation;human origins and migration; molecular adaptations to environment, lifestyle and disease; ancient and forensic DNA analyses; and genealogical reconstructions.

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GWHEG figure

Monday, March 30, 2020

Epigenetic dynamics in infancy and the impact of maternal engagement

Study: A Mother’s Touch May Influence the Genetics of Baby’s Social Development

A study led by a team at University of Virginia shows that early parental care might influence the development of oxytocin system in infants. Oxytocin is a hormone in the human nervous system that is associated with forming social relationship, care giving and other social behaviours. Through observing 101 mothers and their babies, the team finds that although there is no changes in the level of DNA methylation in the mothers, the babies' saliva samples show some different result. 

This study finds that babies who experienced a higher level of involved play with their mothers show a decrease in methylation, which leads to the development of more oxytocin receptors. This result suggests that successful interaction between babies and their care givers at early developmental stage could have an impact on how the oxytocin receptors coding genes express themselves. It could influence the babies' social relationship development later in life.


Monica Cheung– March 30, 2020

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