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Related Concept Videos

Telomeres and Telomerase02:41

Telomeres and Telomerase

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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...
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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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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...
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Updated: Jan 12, 2026

Semi-quantitative Detection of RNA-dependent RNA Polymerase Activity of Human Telomerase Reverse Transcriptase Protein
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Human RPA is an essential telomerase processivity factor for maintaining telomeres.

Sourav Agrawal1, Xiuhua Lin1, Vivek Susvirkar1

  • 1Department of Biochemistry, University of Wisconsin-Madison, Madison, WI , USA.

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|October 30, 2025
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Summary
This summary is machine-generated.

Replication protein A (RPA) is a crucial factor for telomere maintenance, stimulating telomerase activity. RPA

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Telomeres protect chromosome ends from degradation and fusion.
  • Telomerase is a reverse transcriptase that maintains telomere length.
  • Telomere shortening is associated with cellular aging and diseases.

Purpose of the Study:

  • To investigate the role of Replication Protein A (RPA) in telomere maintenance.
  • To elucidate the mechanism by which RPA interacts with telomerase.
  • To explore the link between RPA function and telomeropathies.

Main Methods:

  • In vitro biochemical assays to measure telomerase processivity.
  • AlphaFold modeling to predict protein-protein interactions.
  • Engineering of telomerase reverse transcriptase (TERT) mutants.
  • Analysis of telomerase activity in disease-associated mutants.

Main Results:

  • RPA acts as a critical processivity factor for telomerase.
  • AlphaFold modeling suggests RPA binds a distinct site on TERT compared to TPP1.
  • TERT mutants lacking RPA-mediated stimulation show impaired telomere elongation.
  • Short-telomere disease-associated TERT mutations exhibit reduced RPA-dependent stimulation.

Conclusions:

  • Human RPA is a key regulator of telomerase activity and processivity.
  • Impaired RPA-telomerase interaction contributes to telomeropathies.
  • These findings provide molecular insights into telomere maintenance and related diseases.