TPP1 as a versatile player at the ends of chromosomes

Abstract

Telomeres, the ends of linear eukaryotic chromosomes, are tandem DNA repeats and capped by various telomeric proteins. These nucleoprotein complexes protect telomeres from DNA damage response (DDR), recombination, and end-to-end fusions, ensuring genome stability. The human telosome/shelterin complex is one of the best-studied telomere-associated protein complexes, made up of six core telomeric proteins TRF1, TRF2, TIN2, RAP1, POT1, and TPP1. TPP1, also known as adrenocortical dysplasia protein homolog (ACD), is a putative mammalian homolog of TEBP-β and belongs to the oligonucleotide binding (OB)-fold-containing protein family. Three functional domains have been identified within TPP1, the N-terminal OB fold, the POT1 binding recruitment domain (RD), and the carboxyl-terminal TIN2-interacting domain (TID). TPP1 can interact with both POT1 and TIN2 to maintain telomere structure, and mediate telomerase recruitment for telomere elongation. These features have indicated TPP1 play an essential role in telomere maintenance. Here, we will review important findings that highlight the functional significance of TPP1, with a focus on its interaction with other telosome components and the telomerase. We will also discuss potential implications in disease therapies.

Keywords

telomere / TPP1 / TIN2 / telosome/shelterin / telomerase

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Acknowledgements

This study was supported by the National Basic Research Program (973 Program) (Nos. 2012CB911201 and 2010CB945401), the National Natural Science Foundation (Grant Nos. 31371508, 91019020 and 81330055), the Introduced Innovative R and D Team of Guangdong Province (No. 201001Y0104687244), Zhujiang Program of Science and Technology Nova in Guangzhou (No. 2011J2200082).

Compliance with ethics guidelines

Sijie ZHANG, Zhenhua LUO, Guang SHI, Dan LIU, Zhou SONGYANG and Junjiu HUANG declare that they have no conflict of interest. This manuscript is a review article and does not involve a research protocol requiring approval by the relevant institutional review board or ethics committee.

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