Sperm may have the key to the female longevity. A Japanese research suggests that the reason could be found in the part of the genome that is inherited by the father.
The team of Dr. Tomohiro Kono, director of the Nodai Research Institute, to prove it, designed laboratory mice created from two mothers, with no trace of male genes in their genome. By extracting a mouse ovule with one day of life, they transformed their genetic material into sperm and transplanted it to another oocyte (female sex cell that gives rise to the ovules) of adult specimens, where a mouse embryo was obtained. in the womb of a surrogate mother.
The mice that were born using this technique lacked a male parent and called them 'bimaterial specimens'. They were reared under the same conditions as another group of mice and when compared, it was shown that the 'orphans of a father' lived 186 days more than average, which translates into a third more.
In another of his experiments, the weight of the rodents was checked 49 days after birth and after 20 months. The results obtained showed that those animals that lacked the paternal genome were thinner and had a more reinforced immune system. In the study they point out that "by means of a larger size, male individuals maximize their chances of reproducing, something in which they make a strong investment resulting in a shorter longevity. However, females do not try so hard in these costly behaviors and reserve their energy to give birth and care for the offspring. "
The authors conclude that this is the first evidence that shows that some sperm genes can influence in some way the longevity of mammals.