After over 400 million An analysis of people's life expectancy revealed that the effect of genes on age is significantly lower than the previously calculated factor. The initiators of the study believe that without the inheritance or the value of the living environment, there is another factor that has not yet been widely discussed, writes sciencealert.com.
What is the determining factor of life expectancy? The choice of Ogi. When choosing collaborators and similar partners, it turns out that we are transferring the cultural and genetic specificities associated with life expectancy, such as the transfer of property belonging to us or the social and economic situation.
"Human genes say a lot about biological processes related to aging, but the life-long heritage is not that important," says scientist Graham Ruby, who led the study.
Explaining how traits travel through generations, scientists determine heredity. This measure also shows how the property is transmitted, such as life expectancy, changes over time and affect both genetic and non-genetic differences. The latter may include lifestyle, socio-cultural context, unforeseen circumstances, etc.
Findings from previous studies indicate that a person's life expectancy is 15-30%. heredity is determined, but the authors of the new study using Ancestor, an online source of genetic data, argue that this factor is too high.
"Origin was able to make a more detailed analysis because we could use a larger dataset." The authors of previous studies did not have such opportunities, one of the participants in the study group said.
To analyze the data as closely as possible, the researchers chose a number of relatives and paid special attention to the 400 million. people born in the 19th-20th century All of them had a relationship between parents and children or spouses.
By developing a data-based model, the researchers noticed an unusual and previously unregistered regularity. It turned out that the spouses' life spans are impressively similar – more than brothers whose genetic heritage is much more similar.
Yes, of course, it may be because the spouses live in the same environment. However, some data are motivated by another reason.
It was found that birthdays (siblings and sisters), as well as first-line cousins and spouse cousins, although not linked to the blood and also do not live in the same environment, also survive a similar number of years.
Starting to study the life of other distant relatives, such as uncle, aunt and cousins of the first line and half sisters, the researchers observed the same frequency, which contradicts the conclusion that life expectancy on both sides family tree is similar.
Thus, the data showed that besides the genetic and the common living environment, there is also a third factor that determines the lifespan – the partnership of such persons. This is a case in which a fairly large number of choices for a partner is similar to that of a voter.
"The co-operation of similar people in this context is important because the characteristics that link the many partners are the factors that determine longevity (or vice versa)," says Ruby.
It does not mean that people are rewarded with a sixth sense that allows them to know in advance how many years their comrades will live in.
However, according to scientists, people are really reluctant to choose partners of their own, and this similarity is usually both genetic and socio-cultural, and the researchers' factors, such as the news, are inseparable from longevity.
Simply put, because, for example, rich life leads to longevity, while wealthy people try to marry the less affluent, the lives of wealthy family members are automatically similar.
The same applies to genetic properties. So if high people choose high spouses and height affects life expectancy, they can see the same regularity.
Regarding the importance of such partnerships, researchers spent 7% on life expectancy. which is half what has been considered so far.
Therefore, the longevity of the genes, obviously, is not as common as imagined.
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