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Genetic interplay between human longevity and metabolic pathways - a large-scale eQTL study.

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Human longevity involves genetic and environmental factors. This study found that altered metabolism is linked to longevity, with some associated gene activity being heritable.

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Area of Science:

  • Genetics
  • Aging Research
  • Molecular Biology

Background:

  • Human longevity is a complex trait influenced by both genetic and environmental factors.
  • Distinguishing the contributions of these factors to lifespan remains a significant challenge in aging research.

Purpose of the Study:

  • To investigate the genetic and non-genetic influences on human longevity using a large-scale expression quantitative trait loci (eQTL) study.
  • To identify biological pathways associated with longevity and determine the heritability of associated gene expression.

Main Methods:

  • Conducted an RNA-sequencing-based eQTL analysis on blood samples from 244 individuals across various age groups, including centenarians.
  • Performed subsequent heritability analysis, including a twin study, to assess the genetic contribution to gene expression differences.
  • Analyzed genotype-dependent and independent effects on metabolic pathways in relation to longevity.

Main Results:

  • Identified an association between human longevity and a depletion of metabolic pathways, observed in both genotype-dependent and independent manners.
  • Found that 20% of longevity-associated differentially expressed genes are influenced by genetic variants in cis.
  • Demonstrated that the transcriptional activity of one-third of these differentially regulated genes is heritable, as shown in twin studies.

Conclusions:

  • Human longevity is associated with altered metabolic pathways, suggesting these biological processes may drive longevity rather than solely being a consequence of aging.
  • Genetic factors play a role in longevity through the regulation of gene expression, particularly in metabolic pathways.
  • Heritability of gene expression in longevity-associated pathways indicates a significant genetic component influencing lifespan.