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Related Concept Videos

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...
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...
Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
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.

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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 and reproductive aging.

Courtney W Hanna1, Karla L Bretherick, Jane L Gair

  • 1Department of Medical Genetics, University of British Columbia, Vancouver V6T 1Z3, Canada.

Human Reproduction (Oxford, England)
|February 10, 2009
PubMed
Summary
This summary is machine-generated.

Women with recurrent miscarriage show shorter telomere length, indicating accelerated biological aging. Premature ovarian failure patients, however, have longer telomeres, suggesting distinct aging pathways. This highlights varied physiological factors in reproductive aging.

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Area of Science:

  • Reproductive endocrinology and aging research.
  • Cellular aging and its relation to reproductive health outcomes.
  • Genetics and molecular biology of aging.

Background:

  • Reproductive aging may correlate with biological aging rates.
  • Short telomere length, an aging indicator, might be more prevalent in women with premature reproductive senescence.
  • Understanding these links is crucial for reproductive health.

Purpose of the Study:

  • To investigate the relationship between telomere length and reproductive aging in women.
  • To compare telomere length in women with idiopathic premature ovarian failure (POF) and recurrent miscarriage (RM) against control groups.
  • To explore potential physiological factors influencing these differences.

Main Methods:

  • Telomere length was measured using telomere-specific quantitative PCR.
  • Participants included women with POF (N=34), RM (N=95), general population controls (C1, N=108), and controls with healthy pregnancies after 37 (C2, N=46).
  • Age-adjusted mean telomere length was compared between groups.

Main Results:

  • Women with RM exhibited significantly shorter age-adjusted mean telomere length compared to both control groups (p=0.0004 for C1, p=0.02 for C2).
  • The POF group showed significantly longer mean telomere length than C1 (p=0.01).
  • Short telomeres in RM were not limited to specific pregnancy outcomes.

Conclusions:

  • Shorter telomeres in women with RM may reflect accelerated aging or increased cellular stress.
  • Longer telomeres in POF could be linked to hormonal factors, slow cell division, or autoimmunity.
  • Different reproductive aging conditions appear to be influenced by distinct physiological mechanisms.