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Updated: May 10, 2026
12:08
Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
Published on: May 22, 2013
Telomere, aging and age-related diseases
Huanjiu Xi1, Changyong Li, Fu Ren
1Institute of Anthropology, Liaoning Medical University, No.40, Section 3, Songpo Road, Jinzhou, Liaoning, 121001, People's Republic of China. huanjiuxi@163.com
Aging Clinical and Experimental Research
|June 7, 2013
Summary
Telomeres, protective caps on chromosomes, shorten with age, contributing to cellular senescence and aging. Telomere attrition is a key factor in aging and age-related diseases.
Area of Science:
- Gerontology
- Molecular Biology
- Genetics
Background:
- Aging is a complex biological process impacting all organisms.
- Molecular damage is a central theory explaining aging.
- Telomeres protect chromosome ends and are synthesized by telomerase.
Purpose of the Study:
- To review current literature on telomere shortening and telomerase action in aging.
- To explore the correlation between telomere attrition and age-related diseases.
Main Methods:
- Literature review of contemporary scientific publications.
- Analysis of established relationships between cellular senescence and telomere length.
- Examination of telomere attrition as a factor in aging.
Main Results:
- Telomere shortening is intrinsically linked to cellular senescence.
- Telomere attrition is a common occurrence with advancing age.
- Telomere loss is proposed as a fundamental aging mechanism.
Conclusions:
- Telomere shortening and telomerase activity are significantly correlated with the aging process.
- Understanding telomere dynamics is crucial for addressing age-related diseases.
Related Concept Videos
02:41Telomeres and Telomerase
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
02:41Telomeres and Telomerase
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
01:26Aging
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Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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01:29Replication in Eukaryotes
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Overview
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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...