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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.

LTR Retrotransposons

LTR Retrotransposons

LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...

Transcription Attenuation in Prokaryotes

Transcription Attenuation in Prokaryotes

Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...

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...

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Related Experiment Video

Updated: Jun 3, 2026

Modified Terminal Restriction Fragment Analysis for Quantifying Telomere Length Using In-gel Hybridization

Modified Terminal Restriction Fragment Analysis for Quantifying Telomere Length Using In-gel Hybridization

Published on: July 10, 2017

Telomeric Terminal Restriction Fragment (TRF).

¹Naval Medical Research Institute, Bethesda, MD.

Methods in Molecular Medicine

|March 8, 2011

Summary

This summary is machine-generated.

Telomeres, protective DNA caps, shorten with age due to a cellular

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Last Updated: Jun 3, 2026

Modified Terminal Restriction Fragment Analysis for Quantifying Telomere Length Using In-gel Hybridization

Modified Terminal Restriction Fragment Analysis for Quantifying Telomere Length Using In-gel Hybridization

Published on: July 10, 2017

Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers

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Droplet Digital TRAP (ddTRAP): Adaptation of the Telomere Repeat Amplification Protocol to Droplet Digital Polymerase Chain Reaction

Droplet Digital TRAP (ddTRAP): Adaptation of the Telomere Repeat Amplification Protocol to Droplet Digital Polymerase Chain Reaction

Published on: May 3, 2019

Area of Science:

Molecular Biology
Cell Biology
Genetics

Background:

Telomeres are protective protein-DNA structures capping eukaryotic chromosomes.
Telomerase, a ribonucleoprotein enzyme, maintains telomere length.
Telomere shortening is linked to cellular aging and the Hayflick limit.

Purpose of the Study:

To explain the role of telomeres and telomerase in cellular aging.
To describe the mechanism of telomere maintenance and shortening.
To highlight the regulation of telomere length in cell division.

Main Methods:

Review of existing literature on telomere biology.
Analysis of telomere dynamics in relation to cell cycle and development.
Discussion of the 'mitotic clock' theory of cellular senescence.

Main Results:

Telomerase adds TTAGGG repeats to human chromosome ends, solving the end-replication problem.
Telomere length gradually decreases with age.
Cellular senescence occurs around the Hayflick limit of approximately 100 cell divisions.

Conclusions:

Telomere length is a critical factor in cellular lifespan and aging.
Telomere regulation is complex, involving cell cycle and developmental cues.
Understanding telomere dynamics is key to comprehending cellular senescence.