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== Telomeric Repeat-binding Factor 2 ==

[[File:TERF2_Domains.png|thumb|right|Diagram of TERF2 domains]]

'''Telomeric repeat-binding factor 2''' (TERF2) is a crucial protein involved in the maintenance and protection of [[telomeres]], the specialized structures at the ends of [[chromosomes]]. TERF2 is part of the shelterin complex, a group of proteins that specifically bind to telomeric DNA and regulate its structure and function.

== Structure ==

TERF2 is characterized by several distinct domains that contribute to its function. The protein contains a [[Myb domain]], which is responsible for binding to the telomeric DNA sequence. Additionally, TERF2 has a TRFH (TERF2 homology) domain that mediates protein-protein interactions, allowing it to recruit other components of the shelterin complex.

== Function ==

The primary role of TERF2 is to protect telomeres from being recognized as sites of DNA damage. It achieves this by facilitating the formation of a T-loop structure, where the single-stranded 3' overhang of the telomere invades the double-stranded region, effectively hiding the chromosome end. This structure prevents the activation of DNA damage response pathways that would otherwise lead to inappropriate repair activities.

TERF2 also plays a role in the recruitment of other proteins to the telomere. It interacts with various client proteins that are involved in telomere maintenance and DNA repair processes.

[[File:TERF2_client_protein_recruitment.png|thumb|left|TERF2 recruitment of client proteins]]

== Role in Telomere Maintenance ==

TERF2 is essential for the stability and integrity of telomeres. By maintaining the T-loop structure, TERF2 prevents the activation of [[ATM]] and [[ATR]] kinase pathways, which are typically triggered by DNA double-strand breaks. This protective function is crucial for preventing [[chromosomal instability]] and [[genomic instability]], which can lead to [[cancer]] and other age-related diseases.

== Clinical Significance ==

Dysfunction of TERF2, whether through mutation or altered expression, can lead to telomere shortening and genomic instability. This has been implicated in various diseases, including [[cancer]] and [[premature aging syndromes]]. Understanding the precise mechanisms by which TERF2 operates is therefore of great interest in the field of [[oncology]] and [[gerontology]].

== Related Pages ==

* [[Telomere]]
* [[Shelterin]]
* [[DNA damage response]]
* [[Chromosome]]

[[Category:Telomere biology]]
[[Category:DNA-binding proteins]]

Telomeric repeat-binding factor 2 - Revision history

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