A paper published in Nature Genetics this week looked at genetic data from more than 50,000 people, finding 12 different regions of DNA that seemed to play a role in increasing ADHD risk. Ars Technica reports: This evidence comes from a genome-wide association study, or GWAS: a close look at how the DNA of people with ADHD differs from those without. Geneticist Ditte Demontis and her colleagues used data from more than 20,000 people with ADHD, comparing them to a control group of 35,000 people without an ADHD diagnosis. They found 304 points where tiny differences in DNA — like single letter swaps — were distributed across their two groups in a statistically telling way. If any of those variants were very close together, the researchers counted them as representing the same stretch of DNA, grouping them together into 12 important regions.
There were correlations between the genetic risk for ADHD and a range of other conditions, including depression and anorexia. That ties in with the idea that genetic variation might be important in a way that plays out system-wide. Some of the genes they identified are also known to be involved in other neurological conditions, including speech and learning disabilities, depression, and schizophrenia.
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