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Contact from caregivers changes children's molecular profile
December 3, 2017, 3:24 pm

According to new research from the University of British Columbia and Children's Hospital Research Institute in Canada, reveals that the amount of close and comforting contact between infants and their caregivers can affect children at the molecular level and this effect was discernable four years later.

The study showed that children who had been more distressed as infants and had received less physical contact had a molecular profile in their cells that was underdeveloped for their age and pointing to the possibility that they were lagging biologically and unable to thrive.

Although the implications of the study for childhood development and adult health have yet to be understood, this finding is the first to show that the simple act of touching, early in life, has deeply-rooted and potentially lifelong consequences on genetic expression.

Researchers asked parents of 5-week-old babies to keep a diary of their infants' behaviour (such as sleeping, fussing, crying or feeding) as well as the duration of caregiving that involved bodily contact. When the children were about 4 1/2 years old, their DNA was sampled by swabbing the inside of their cheeks.

The team examined a biochemical modification called DNA methylation, in which some parts of the chromosome are tagged with small molecules made of carbon and hydrogen. These molecules act as ‘dimmer switches’ that help to control how active each gene is, and thus affect how cells function.

The extent of methylation, and where on the DNA it specifically happens, can be influenced by external conditions, especially in childhood. These epigenetic patterns also change in predictable ways as we age.

Scientists found consistent methylation differences between high-contact and low-contact children at five specific DNA sites. Two of these sites fell within genes: one played a role in the immune system, and the other was involved in metabolism. However, the downstream effects of these epigenetic changes on child development and health are not known yet.

The children who experienced higher distress and received relatively little contact had an ‘epigenetic age’ that was lower than would be expected, given their actual age. The researchers are now planning on following up to see whether the 'biological immaturity' they found in these children carries broad implications for their health, especially their psychological development. If further research confirms this initial finding, it will underscore the importance of providing physical contact, especially for distressed infants.


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