Women who are happy may benefit from the effects of a single gene, researchers have reported.
The gene has no impact on male contentment – but is also responsible for mental disturbance and aggression, researchers say.
Now a particular version of the gene has been found which makes women happy.
And while scientists can explain how this works, they are not sure why it has no effect on men – although they suspect male hormones.
The new version of the MAOA gene is known as "low expression" and is said to promote high levels of the monoamine chemical, which promotes happiness. It also helps to control other brain mood chemicals, such as serotonin and dopamine.
The findings, reported in the journal Progress in Neuro-Psychopharmacology & Biological Psychiatry, come from a study of 345 people conducted in Florida, USA.
Researcher Dr Henian Chen, of the University of South Florida College of Public Health, Tampa, said: "I was surprised by the result, because low expression of MAOA has been related to some negative outcomes like alcoholism, aggressiveness and antisocial behaviour.
"It’s even called the warrior gene by some scientists, but, at least for women, our study points to a brighter side of this gene."
Dr Chen added: "I think the time is right for more genetic studies that focus on well-being and happiness."
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