3 December 2012
Researchers from 43 studies of pregnancy and birth, including Children of the 90s, have identified four new genetic regions that influence birth weight, providing further evidence that genes as well as maternal nutrition are important for growth in the womb. Three of the regions are also linked to adult metabolism, helping to explain why smaller babies have higher rates of chronic diseases later in life.
It has been known for some time that babies born with a lower birth weight are at higher risk of chronic diseases such as type 2 diabetes and cardiovascular disease. Three genetic regions have already been identified that influence birth weight, two of which are also linked to an increased susceptibility to type 2 diabetes.
The latest study analysed almost 70,000 individuals of European descent and the findings confirmed the three regions previously identified and also revealed four new genetic regions that are associated with birth weight.
One of the new genetic regions is also associated with blood pressure in adulthood, providing the first evidence of a genetic link between birth weight and blood pressure. Two of the regions are known to be linked to adult height, showing that genes involved in growth begin to take effect at a very early stage.
Dr Nic Timpson, a co-author from the University of Bristol’s School of Social and Community Medicine who works with Children of the 90s, said:
‘Of the intriguing findings in this work, the notion of shared biological underpinnings of early life experience and later health is one we are beginning to demonstrate with real evidence from studies like this. A fascinating extension of this work will be the dissection of the association signals reported here and working out their relevance for later life health.’Dr Rachel Freathy, co-lead author from the University of Exeter Medical School, added:
Professor Mark McCarthy, a co-author of the study from the Wellcome Trust Centre for Human Genetics, added:
‘These discoveries give us important clues to the mechanisms responsible for the control of a baby’s growth in the womb, and may eventually lead to a better understanding of how to manage growth problems during pregnancy.’
‘Our findings add to the growing evidence that events during early growth in the womb can have a significant impact on our health as adults. However, these genes tell only part of the story. It’s important that we understand how much is down to genetics and how much is due to the environment in which we grow so that we can target efforts to prevent disease later in life.’
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