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Telomere Dynamics in Livestock.

Nan Zhang1, Emilie C Baker2, Thomas H Welsh1,3

  • 1Department of Animal Science, Texas A&M University, College Station, TX 77843, USA.

Biology
|November 24, 2023
PubMed
Summary
This summary is machine-generated.

Telomere length in livestock, like dairy cows, generally shortens with age, impacting animal longevity. Understanding telomere dynamics may offer new strategies for genetic improvement and biomedical insights.

Keywords:
cattlegoatshorseslivestocklongevitypigssheeptelomere

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Area of Science:

  • Genetics
  • Animal Science
  • Gerontology

Background:

  • Telomeres are protective nucleotide sequences at chromosome ends that shorten with cell division.
  • In humans, telomere attrition correlates with aging, stress, and disease.
  • Concerns about cloned animals' aging led to early telomere research in livestock.

Purpose of the Study:

  • To investigate telomere dynamics in livestock, focusing on aging and genetic factors.
  • To explore the relationship between telomere length and animal productivity.
  • To assess the potential of telomere attrition as a target for genetic improvement.

Main Methods:

  • Analysis of telomere length in peripheral blood cells across different livestock species (dairy cows, pigs, horses, beef cattle, sheep, goats).
  • Evaluation of breed effects, heritability, and the impact of external stressors on telomere length.
  • Correlation analysis between telomere length and animal productivity measures.

Main Results:

  • Most studies show an inverse relationship between peripheral blood cell telomere length and age in livestock.
  • Heritability estimates for telomere length in dairy cows range from 0.12 to 0.46.
  • Minimal associations were found between telomere length and animal productivity.

Conclusions:

  • Telomere attrition is a significant factor in livestock aging, mirroring findings in other species.
  • Tissue-specific telomere dynamics may offer novel avenues for genetic improvement in livestock longevity.
  • Research in livestock telomere biology provides valuable translational knowledge for human biomedical applications.