Telomeric repeat-binding factor 2-interacting protein 1 (TERF2IP)

Involved in the regulation of telomere length and protection as a part of the shelterin complex (telosome). In contrast to other elements of the shelterin complex, it is dispensible for telomere capping and does not participate in the protection of telomeres against non-homologous end-joining (NHEJ)-mediated repair.

Instead, it is required to negatively regulate telomere recombination and is essential for repressing homology-directed repair (HDR), which may affect telomere length. Doesn't bind DNA directly: recruited to telomeric double-stranded 5'-TTAGGG-3' repeats through its interaction with TERF2.