A genetic analysis of almost 900 offenders in Finland has revealed two genes associated with violent crime.
Those with the genes were 13 times more likely to have a history of repeated violent behaviour.
The authors of the study, published in the journal Molecular Psychiatry, said at least 5-10% of all violent crime in Finland could be attributed to individuals with these genotypes.
But they stressed the genes could not be used to screen criminals.
Many more genes may be involved in violent behaviour and environmental factors are also known to have a fundamental role.
Even if an individual has a “high-risk combination” of these genes the majority will never commit a crime, the lead author of the work Jari Tiihonen of the Karolinska Institutet in Sweden said.
“Committing a severe, violent crime is extremely rare in the general population. So even though the relative risk would be increased, the absolute risk is very low,” he told the BBC.
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