Selecting a life partner: The role of Genetics and immunity in selecting a life partner

Brazil - By studying the genetic material of 19 couples, researchers have succeeded in demonstrating that people are looking for a partner whose DNA is different from theirs. They demonstrated that individuals choose a spouse who does resemble them.

In most vertebrates, the chromosome n°6 contains a region involved in the immune system, the Major Histocompatibility Complex (MHC). The genes that are home to many variations.

Scientists have found that people whose versions with different MHC tend to unite themselves. A feature which can be explained by an unconscious desire to give life to a stronger offspring.

Indeed, a child born to parents whose genes present in the MHC are very different will have a more complete immune system. It will therefore be able to fight against many infections.

The indices on the MHC composition of an individual are present in sweat release. The human subconscious driving them to breed with individuals that are complementary, they turn spontaneously to partners whose MHC structure is very different from theirs.

Maria de Graca Bicalho, professor at the University of Parana in Brazil, puts the emphasis on the fact that the preconceived ideas that we seek a partner who resembles to us are erroneous. Ensuring complementarity between individuals, this characteristic of love the alchemy of human, naturally avoids the parents of one family breed together. She also maintains genetic diversity among individuals, enriching the human genome.

Studies have been conducted on couples in which the MHC genes leader are similar. They showed that the time intervals between the births of their children are longer, which could be a sign of unsuspected miscarriages.

Scientists believe that this discovery will increase knowledge about the human concept. They may provide new information on the fertility of couples and ensure optimum pregnancy.

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