Is Marital Happiness in Your DNA? What the 5-HTTLPR Study Actually Found
Editor's note: this piece was originally published in 2012 with a claim about a PLOS ONE study linking a serotonin gene to divorce in women. We could not verify that study, so this version replaces it with the research that actually exists.
The short version: No gene determines whether you'll divorce. But one gene variant does seem to decide how strongly your marriage's emotional climate affects you: carriers of two short copies of the serotonin-regulating 5-HTTLPR variant suffer more in cold marriages — and flourish more in warm ones — than everyone else.
What the study really found
Researchers at UC Berkeley and Northwestern drew on a longitudinal study that has tracked 156 married couples since 1989; 125 participants provided DNA samples, and the team matched genotypes against the emotional content of the couples' lab conversations and their marital satisfaction (Berkeley News, 2013). Their findings, published in the journal Emotion:
- Participants with two short 5-HTTLPR alleles were the unhappiest when surrounded by negative emotions like anger and contempt — and the happiest when surrounded by humor and affection.
- Those with one or two long alleles were far less bothered by the emotional tenor of their marriages, for better or worse.
Senior author Robert Levenson called it the answer to "an enduring mystery": why one spouse is so attuned to a marriage's emotional climate while the other seems oblivious.
Why "divorce gene" is the wrong frame
Three things the headlines usually get wrong:
- It predicts sensitivity, not outcome. The gene doesn't cause divorce; it amplifies how much the emotional atmosphere of a marriage matters. The same variant linked to misery in bad marriages is linked to exceptional satisfaction in good ones.
- It isn't women-only. The study covered married adults generally, not women specifically.
- It isn't destiny. About 125 genotyped participants is a respectable sample, but one finding in behavioral genetics is never the final word — these effects interact with upbringing, culture, and plain circumstance.
The honest takeaway
The finding is more interesting than the myth. It doesn't reduce anyone to their DNA — it suggests some people are simply more porous to the emotional weather around them. If that's you, the actionable insight isn't genetic testing; it's that the emotional climate of your home matters more for you than for the average person, and investing in it pays unusual dividends.
From the archive: this piece was originally published February 28, 2012, and has been corrected and rewritten for accuracy.
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