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Related Concept Videos

Telomeres and Telomerase02:41

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 Telomerase02:41

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 Eukaryotes02:31

Replication in Eukaryotes

Overview
Replication in Eukaryotes01:29

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 Senescence02:15

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 Senescence02:15

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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Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
12:08

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

Published on: May 22, 2013

Telomere length in reproduction.

J Thilagavathi1, S Venkatesh, R Dada

  • 1Laboratory for Molecular Reproduction and Genetics, Department of Anatomy, All India Institute of Medical Sciences, New Delhi, India.

Andrologia
|August 30, 2012
PubMed
Summary
This summary is machine-generated.

Telomeres, chromosome end structures, are vital for genome stability and reproductive health. Their length dynamics, influenced by genetics and lifestyle, impact fertility and germ cell integrity.

Keywords:
Oxidative stress and infertilityreproductiontelomere lengthtelomere-binding proteins

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Area of Science:

  • Genetics
  • Cell Biology
  • Reproductive Science

Background:

  • Telomeres are protective DNA sequences at chromosome ends, crucial for stability.
  • Telomere length is linked to cellular aging and organismal lifespan.
  • Their specific role in human reproduction requires further elucidation.

Purpose of the Study:

  • To review the function, structure, and length dynamics of telomeres.
  • To explore the impact of telomere length on reproductive processes.
  • To highlight the significance of telomeres in germ cell development and fertility.

Main Methods:

  • Literature review focusing on telomere biology and reproductive function.
  • Analysis of existing research on telomere length in germ cells and somatic cells.
  • Synthesis of data regarding genetic, lifestyle, and stress-related factors influencing telomere length.

Main Results:

  • Telomere shortening is associated with meiotic errors and aneuploidy.
  • Short telomeres induce germ cell apoptosis in males and meiotic arrest in females.
  • Telomeres elongate during spermatogenesis, with mature spermatozoa exhibiting longer telomeres.

Conclusions:

  • Telomere length is a critical determinant of reproductive success and germ cell quality.
  • Understanding telomere dynamics is essential for addressing infertility and reproductive aging.
  • Further research into telomere regulation could offer novel therapeutic targets for reproductive health.