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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.

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...

Replication in Eukaryotes

Replication in Eukaryotes

Spindle Assembly

Spindle Assembly

Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...

The Mitotic Spindle

The Mitotic Spindle

The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...

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Related Experiment Video

Updated: Jul 11, 2026

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

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

Published on: August 30, 2024

Tankyrase function at telomeres, spindle poles, and beyond.

Susan J Hsiao¹, Susan Smith

¹Skirball Institute of Biomolecular Medicine, New York University School of Medicine, 540 First Avenue, 2nd Floor, New York, NY 10016, United States.

|September 11, 2007

Summary

Telomeres require specialized proteins like shelterin for maintenance. Tankyrase 1, recruited by TRF1, plays a key role in telomere length regulation and chromosome separation.

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Area of Science:

Molecular Biology
Cell Biology
Biochemistry

Background:

Telomeres, the protective caps of chromosomes, necessitate unique mechanisms for their maintenance, replication, and segregation during cell division.
The shelterin protein complex is essential for telomere protection, but it collaborates with other cellular factors.
Tankyrase 1, a poly(ADP-ribose) polymerase, is recruited to telomeres by the TRF1 subunit of shelterin, indicating its involvement in telomere regulation.

Purpose of the Study:

To review the current understanding of tankyrase proteins, focusing on their subcellular localization.
To elucidate the diverse binding partners of tankyrases.
To summarize the functional roles of tankyrases, particularly tankyrase 1, at telomeres.

Main Methods:

Literature review of existing research on tankyrases.
Analysis of studies detailing protein localization and interactions.
Synthesis of functional data related to telomere biology.

Main Results:

Tankyrase 1 is recruited to telomeres by TRF1 and is involved in telomere length regulation and sister chromatid separation.
Tankyrases exhibit complex localization patterns across various subcellular compartments.
Tankyrases interact with a multitude of binding partners, and tankyrase 2 may have overlapping functions.

Conclusions:

Tankyrase 1 is a crucial regulator at telomeres, working alongside the shelterin complex.
The multifaceted nature of tankyrases, including their localization and interactions, presents challenges in fully understanding their precise functions.
Further research is needed to fully delineate the roles and potential functional redundancy between tankyrase 1 and tankyrase 2 in telomere maintenance and beyond.