Are some of us born to be single? Study reveals it could be in our DNA You could be genetically predisposed to be single. IF you've ever wondered why you seem to be permanently single while others are always coupled up, it could be down to your DNA. Scientists have discovered a "singleton gene" - and those who have it are 20 per cent more likely to not be in a relationship. The study by researchers at Beijing University found that the gene lowers levels of serotonin, making people less comfortable with intimacy, the Daily Mail reported. Our DNA can affect whether we marry and whether we divorce. Scientists tested hair samples from almost 600 Chinese university students to look at the gene 5-HTA1. They found that people with the "G" version were much more likely to be single, with 60 per cent of them not in a relationship, compared to 50 per cent of those with "C" version of the gene. It was already known that people with the "G" allele find it more difficult to get close to others, are more neurotic and more prone to depression. Now it appears that it could affect your ability to maintain a relationship, no matter how attractive you are to potential partners. The gene that makes us prone to depression could also make us less likely to have successful relationships. The study concluded: "As pessimism and neuroticism are detrimental to the formation, quality and stability of relationships, this connection between the G allele and psychological disorders might decrease carriers" dating opportunities or lead to romantic relationship failure." It is clear that more research is needed, with the experiment being a relatively small one and only involving students. But scientists said it was "evidence for genetic contribution to social relationships in certain contexts." Other experts questioned the importance of genes, telling the Daily Mail that we can usually overcome the influence of our DNA to form lasting relationships. But previous studies have shown that genes play a part in our likelihood of marrying and divorcing and the number of sexual partners we have.