TERF2

TERF2 Full Name

telomeric repeat binding factor 2

TERF2 Introduction

Telomeric repeat binding factor 2 (TERF2), also known as TRF2, is a core component of the shelterin complex that protects chromosome ends from being recognized as DNA double-strand breaks. As a telomere-associated protein, TERF2 specifically binds double-stranded telomeric DNA and plays a central role in maintaining telomere architecture, genome stability, and cellular lifespan. For researchers investigating mechanisms of aging, genome instability, and cancer progression, TERF2 has emerged as a critical regulatory node because telomere dysfunction is closely linked to abnormal cellular proliferation and disease development. By promoting the formation and stabilization of the protective T-loop structure at chromosome ends, TERF2 prevents inappropriate activation of DNA damage signaling pathways, particularly ATM-mediated responses and non-homologous end joining (NHEJ), thereby ensuring proper chromosome end protection.

Beyond its classical role in telomere maintenance, TERF2 has been increasingly recognized as a multifunctional regulator involved in broader cellular processes. Recent structural studies have shown that TERF2 can promote higher-order organization of human telomeric chromatin by inducing columnar stacking of telomere-associated nucleosome fibers, enhancing the mechanical stability and compaction of telomeric chromatin. In addition, emerging evidence indicates that TERF2 performs important non-canonical functions outside telomeres, including regulation of autophagy, nuclear architecture, cell polarity, and metastatic behavior. Studies in triple-negative breast cancer have demonstrated that TERF2 interaction with the nuclear envelope contributes to tumor cell polarization and migration, suggesting that TERF2 may influence cancer progression through mechanisms beyond its established role in chromosome protection.

Dysregulation of TERF2 expression and activity has been implicated in multiple human diseases, particularly cancer. Elevated TERF2 levels have been observed in various tumor types, where excessive telomere protection may allow cancer cells to bypass replicative limits and maintain uncontrolled growth. Pan-cancer analyses and experimental knockdown studies have suggested that TERF2 contributes to tumor cell proliferation, migration, immune microenvironment regulation, and disease progression, with reduced TERF2 expression suppressing growth and metastatic potential in models such as gastric cancer. Furthermore, TERF2-mediated inhibition of HMGB1-driven autophagy provides additional insight into how this telomeric protein may support tumor survival through non-telomeric pathways. Due to its essential role in telomere biology and its involvement in oncogenic signaling networks, TERF2 is being explored as a potential biomarker and therapeutic target for cancers and other disorders associated with genome instability, cellular aging, and abnormal DNA repair.

Alternate Names for TERF2

TERF2; telomeric repeat binding factor 2; TRBF2; telomeric repeat-binding factor 2; TRF2; telomeric DNA-binding protein; TTAGGG repeat-binding factor 2; telomeric repeat binding protein 2;

• 1.Wong SY, et al.; The shelterin component TRF2 mediates columnar stacking of human telomeric chromatin. EMBO J. 2024, 43(1):87-111.
  2.Petti E, et al.; TRF2 interaction with nuclear envelope is required for cell polarization and metastasis in triple negative breast cancer. Cell Death Dis. 2025, 16(1):224.