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Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans

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A LINE-1 component to human aging: do LINE elements exact a longevity cost for evolutionary advantage?

Georges St Laurent¹, Neil Hammell, Timothy A McCaffrey

¹The George Washington University Medical Center, Department of Medicine, Division of Genomic Medicine, 2300 I St. NW, Washington, DC 20037, United States.

Mechanisms of Ageing and Development

|March 30, 2010

Summary

Aging is linked to increased disease risk. This review proposes that genetic instability from Long Interspersed Nuclear Elements (LINEs), specifically LINE-1 (L1), may erode genomic integrity and negatively impact longevity.

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A Suppressor Screen for the Characterization of Genetic Links Regulating Chronological Lifespan in Saccharomyces cerevisiae

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Published on: September 17, 2020

Area of Science:

Genetics
Molecular Biology
Aging Research

Background:

Advancing age is the primary risk factor for major diseases like cancer and heart disease.
DNA damage is a proposed common pathway in aging mechanisms.
Genetic and environmental factors influencing longevity are being uncovered.

Purpose of the Study:

To propose a new theory for aging based on inherent genetic instability.
To investigate the role of Long Interspersed Nuclear Elements (LINEs) in aging.
To present a hypothesis on how LINE-1 (L1) activity impacts genomic integrity and longevity.

Main Methods:

Review of existing literature on aging, DNA damage, and retrotransposons.
Formulation of a theoretical model linking L1 activity to aging.
Identification of testable hypotheses for future research.

Main Results:

Long Interspersed Nuclear Elements (LINEs), particularly LINE-1 (L1), are endogenous retrotransposons comprising ~20% of the human genome.
L1 elements possess retrotransposition activity via ORF1p and ORF2p.
L1 transcripts are found in adult somatic cells, suggesting potential activity beyond embryogenesis.

Conclusions:

Somatic activity of LINE-1 (L1) elements may act as an 'endogenous clock', compromising genomic integrity.
L1 activity might compete with double-strand break repair mechanisms, negatively affecting longevity.
Further research is needed to validate the proposed link between L1 activity, DNA repair, healthy aging, and lifespan.