Children whose mothers or grandmothers smoked during pregnancy are at increased risk of asthma in childhood, but the underlying causes of this are not well understood. Now a new study indicates changes in a process called DNA methylation that occurs before birth may be a root cause. The study will be presented at the ATS 2011 International Conference. DNA methylation is a process that can alter a gene's usual function. These altered genes can be passed along from parent to child... 
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