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Smoking and hyperactivity share common genetic risk factor
Date:10/29/2012

[Family-based association study of ADHD and genes increasing the risk for smoking behaviours Online First doi 10.1136/archdischild-2012-301882] [Shared biological risks that influence brain and behaviour Online First doi 10.1136/archdischild-2012-302461]

A variation of a particular gene may link the behaviours typical of childhood attention hyperactivity disorder, or ADHD for short, and those associated with smoking, suggests research published online in the Archives of Disease in Childhood.

Childhood ADHD and subsequent smoking in adulthood frequently go hand in hand, say the authors, with people who have been diagnosed with ADHD more likely to start smoking early and to smoke twice as much as those without the condition.

The researchers focused on five variations in DNA sequences (single nucleotide polymorphisms or SNPs) in different genes that are strongly associated with different aspects of smoking behaviour, such as the number of cigarettes smoked every day, and taking up and quitting smoking.

They wanted to see if these might also be linked to hyperactivity in 454 children aged between 6 and 12 with confirmed ADHD and referred to specialist treatment centres.

They quizzed the children's mothers about their smoking habits during pregnancy. Of those 394 mothers for whom they had information, 171 had smoked during pregnancy and 223 had not.

And they assessed the extent of the children's behavioural and emotional problems at home and at school, as well as their intellectual capacity, using a battery of validated tests.

They took blood samples from the children, their parents, and siblings to see if any high risk variants (alleles) of the five genetic markers had been passed on, and if these were more strongly associated with the externalising behaviours/disinhibition and impaired cognitive performance characteristic of ADHD.

Only one of the five SNPs (rs 1329650), which was ass
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Contact: Stephanie Burns
sburns@bmjgroup.com
44-020-738-36920
BMJ-British Medical Journal
Source:Eurekalert

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