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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.
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
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Cell-mediated Immune Responses

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Development of Immunocompetence01:22

Development of Immunocompetence

The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
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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
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Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
08:34

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Published on: April 13, 2015

Telomeres and immune competency.

Nan-ping Weng1

  • 1Laboratory of Molecular Biology and Immunology, National Institute on Aging, National Institutes of Health, 251 Bayview Blvd., Suite 100, Baltimore, MD 21224, USA. Wengn@mail.nih.gov

Current Opinion in Immunology
|May 26, 2012
PubMed
Summary
This summary is machine-generated.

Telomere attrition shortens chromosome ends during cell replication. This review examines telomere length dynamics and their impact on immune cell function and related health conditions.

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Last Updated: May 22, 2026

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Area of Science:

  • Genetics
  • Cell Biology
  • Immunology

Background:

  • Telomeres protect chromosome ends, crucial for cellular replication.
  • Telomere shortening occurs due to replication limits and insufficient telomerase activity.
  • Genetic defects can accelerate telomere attrition, impacting proliferating cells.

Purpose of the Study:

  • To review recent studies on telomere length dynamics.
  • To highlight the relevance of telomere dynamics to immune function.

Main Methods:

  • Review of recent scientific literature.
  • Analysis of studies on telomere length measurement in human leukocyte populations.

Main Results:

  • Telomere attrition is a consequence of DNA replication and telomere maintenance mechanisms.
  • Average telomere length in leukocytes is linked to various immune and non-immune health conditions.
  • Accelerated telomere attrition leads to severe phenotypes in hematopoietic and other cells.

Conclusions:

  • Telomere length dynamics are critical for cellular integrity and immune function.
  • Understanding telomere attrition is essential for comprehending numerous health conditions.