Nucleostemin Prevents Telomere Damage by Promoting PML-IV Recruitment to SUMOylated TRF1

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2012 May 30

PMID 22641345

Citations 25

Authors

Joseph K Hsu

Tao Lin

Robert Y L Tsai

Affiliations

Soon will be listed here.

Abstract

Continuously dividing cells must be protected from telomeric and nontelomeric DNA damage in order to maintain their proliferative potential. Here, we report a novel telomere-protecting mechanism regulated by nucleostemin (NS). NS depletion increased the number of telomere damage foci in both telomerase-active (TA(+)) and alternative lengthening of telomere (ALT) cells and decreased the percentage of damaged telomeres associated with ALT-associated PML bodies (APB) and the number of APB in ALT cells. Mechanistically, NS could promote the recruitment of PML-IV to SUMOylated TRF1 in TA(+) and ALT cells. This event was stimulated by DNA damage. Supporting the importance of NS and PML-IV in telomere protection, we demonstrate that loss of NS or PML-IV increased the frequency of telomere damage and aberration, reduced telomeric length, and perturbed the TRF2(ΔBΔM)-induced telomeric recruitment of RAD51. Conversely, overexpression of either NS or PML-IV protected ALT and TA(+) cells from telomere damage. This work reveals a novel mechanism in telomere protection.

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