The 16 Genetic Markers Associated With Decreased Lifespan

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Biotech Nigeria
The 16 Genetic Markers Associated With Decreased Lifespan

The answer to how long each of us will live is partly encoded in our genome. 

Researchers have identified 16 genetic markers associated with a decreased lifespan, including 14 new to science. This is the largest set of markers of lifespan uncovered to date. About 10 percent of the population carries some configurations of these markers that shorten their life by over a year compared with the population average.... the study provides a powerful computational framework to uncover the genetics of our time of death, and ultimately of any disease.

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Why do some of us live longer than others? While the environment in which we live – including our socio-economic status or the food we eat – plays the biggest part, about 20 to 30 percent of the variation in human lifespan comes down to our genome. Changes in particular locations in our DNA sequence, such as single-nucleotide polymorphisms (SNPs), could therefore hold some of the keys to our longevity.

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In a new study, a team of scientists, led by Kutalik, has used an innovative computational approach to analyse a dataset of 116,279 individuals and probe 2.3 million human SNPs.

An unparalleled number of SNPs associated with lifespan (16) were uncovered, including 14 new to science. "In our approach, we prioritized changes in the DNA known to be linked to age-related diseases in order to scan the genome more efficiently," says Kutalik. "This is the largest set of lifespan-associated genetic markers ever uncovered."

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The approach also enabled the researchers to explore how the DNA changes affected lifespan in a holistic way. They found that most SNPs had an effect on lifespan by impacting more than a single disease or risk factor, for example through being more addicted to smoking as well as through being predisposed to schizophrenia.

The discovered SNPs, combined with gene expression data, allowed the researchers to identify that lower brain expression of three genes neighbouring the SNPs (RBM6, SULT1A1 and CHRNA5, involved in nicotine dependence) was causally linked to increased lifespan.

These three genes could therefore act as biomarkers of longevity, i.e. survival beyond 85-100 years. "To support this hypothesis, we have shown that mice with a lower brain expression level of RBM6 lived substantially longer," comments Prof. Johan Auwerx, professor at the EPFL.

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News Reference: The 16 genetic markers that can cut a life story short

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