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Does a retrograde response in human aging and longevity exist?

G De Benedictis1, G Carrieri, S Garasto

  • 1Cell Biology Department, University of Calabria, Rende, Italy. g.debenedictis@unical.it

Experimental Gerontology
|October 29, 2000
PubMed
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Human longevity may involve a retrograde response (RR) mechanism, similar to yeast, where mitochondrial DNA (mtDNA) and nuclear gene (Tyrosine hydroxylase) interactions influence lifespan. Centenarians show non-random associations between mtDNA haplogroups and THO genotypes, suggesting evolutionary maintenance of RR.

Area of Science:

  • Genetics
  • Molecular Biology
  • Aging Research

Background:

  • The retrograde response (RR) in yeast compensates for mitochondrial DNA (mtDNA) impairments by up-regulating nuclear stress-responder genes and extending lifespan.
  • Variability in both mtDNA and the stress-responder gene Tyrosine hydroxylase (THO) correlates with human longevity.

Purpose of the Study:

  • To investigate if mechanisms similar to yeast's RR exist in humans.
  • To explore the association between mtDNA inherited variants (haplogroups) and THO genotypes across different age groups, including centenarians.

Main Methods:

  • Analysis of mtDNA haplogroup distribution according to THO genotypes.
  • Comparison across three age groups: 20-49 years, 50-80 years, and centenarians.

Related Experiment Videos

Main Results:

  • Random association between mtDNA haplogroups and THO genotypes in younger adults (20-49 years).
  • Non-random association observed in older adults (50-80 years) and particularly in centenarians.
  • Over-representation of the U mtDNA haplogroup in centenarians with THO genotypes unfavorable for longevity (p=0.012).

Conclusions:

  • Findings support the hypothesis that human longevity depends on specific interactions between mtDNA and nuclear DNA.
  • The study does not rule out the possibility that an RR mechanism has been conserved through evolution and is present in humans.