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Why live more women? | Diseases and conditions

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The genome that is inherited through the father could have the answer to the eternal question of why life expectancy is greater in females, as it reveals a Japanese research.
Sperm may have the key to female longevity. A Japanese research suggests that the reason may be found in the portion of the genome that is inherited through the father.
The team of Dr. Tomohiro Kono, director of the Nodai Research Institute, to prove it, designed laboratory mice created from two mothers, without trace of male genes in its genome. By extracting an egg of mouse with a day of life, they transformed their genetic material in sperm and transplanted it to another (female sex cell that gives rise to the ovules) oocyte of exemplary adults, where was a mouse embryo that is implanted in the uterus of a surrogate mother.
The mice that were born using this technique lacked male parent and called them 'bimaternos specimens'. They were raised in the same conditions as another group of mice and in comparison showed that the 'fatherless' lived 186 days more on average than normal, resulting in one-third more.
Another of his experiments, found the weight of rodents to 49 days of birth and after 20 months. The results reflected that those animals that lacked parental genome were thinner and had a stronger immune system. In the study, they point out that "by a larger male individuals maximize their ability to reproduce, something in it which made a strong investment resulting in a shorter longevity. However, females do not strive to both these behaviors as expensive and reserved their energy for giving birth and caring for the offspring".
The authors conclude that it is the first evidence that demonstrates that some sperm genes may influence somehow the longevity of mammals.
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