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Telomeres and Telomerase

Telomeres 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.

Telomeres and Telomerase

Telomeres 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.

Replication in Eukaryotes

Replication in Eukaryotes

Replication in Eukaryotes

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...

Replicative Cell Senescence

Replicative Cell Senescence

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...

Replicative Cell Senescence

Replicative Cell Senescence

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...

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Related Experiment Video

Updated: May 15, 2026

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

Published on: May 22, 2013

Telomeres and human reproduction.

Keri Horan Kalmbach¹, Danielle Mota Fontes Antunes², Roberta Caetano Dracxler³

¹Department of Obstetrics and Gynecology, New York University, Langone Medical Center, New York City, New York.

Fertility and Sterility

|January 1, 2013

Summary

Telomere shortening in the female germ line drives reproductive aging in women. This contrasts with men, whose testes maintain telomere length, suggesting evolutionary differences in reproductive aging.

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Area of Science:

Reproductive biology
Cellular aging
Genetics

Background:

Telomeres are protective caps on chromosomes that shorten with cell division, contributing to organismal aging.
Reproductive aging, particularly in women, is a significant factor in fertility decline.
Telomere dynamics differ between sexes, with potential implications for reproductive lifespan.

Purpose of the Study:

To propose and investigate a telomere theory of reproductive aging in women.
To explore the role of telomere shortening in female germ cells as a primary driver of aging.
To compare telomere dynamics in male and female reproduction.

Main Methods:

Experimental telomere shortening in mouse oocytes to model human oocyte aging.
Analysis of oocyte quality, embryo development, and chromosomal integrity in mice with shortened telomeres.
Examination of telomere length in human oocytes from women undergoing in vitro fertilization.

Main Results:

Experimental telomere shortening in mice recapitulated key features of human oocyte aging, including reduced synapsis, increased embryo fragmentation, apoptosis, and chromosomal abnormalities.
Oocytes from women undergoing in vitro fertilization exhibited shorter telomeres, correlating with fragmented and aneuploid embryos.
Male testes possess spermatogonia expressing telomerase, which rejuvenates telomere reserves throughout life.

Conclusions:

Telomere shortening in the female germ line is a primary mechanism of reproductive aging in women.
Differential telomere maintenance between sexes may be an evolved reproductive strategy.
Altered telomere biology warrants further investigation in reproductive tract pathologies like endometriosis and gynecologic cancers.