Homeobox-containing protein 1

Definition:

Binds directly to 5'-TTAGGG-3' repeats in telomeric DNA. Associates with the telomerase complex at sites of active telomere processing and positively regulates telomere elongation. Important for TERT binding to chromatin, indicating a role in recruitment of the telomerase complex to telomeres (By similarity). Also plays a role in the alternative lengthening of telomeres (ALT) pathway in telomerase-negative cells where it promotes formation and/or maintenance of ALT-associated promyelocytic leukemia bodies (APBs). Enhances formation of telomere C-circles in ALT cells, suggesting a possible role in telomere recombination. Might also be involved in the DNA damage response at telomeres.

References:

[1]. Dennis Kappei, et al. HOT1 is a mammalian direct telomere repeat-binding protein contributing to telomerase recruitment. EMBO J. 2013 Jun 12;32(12):1681-701. [Content Brief]

[2]. Xuyang Feng, et al. The telomere-associated homeobox-containing protein TAH1/HMBOX1 participates in telomere maintenance in ALT cells. J Cell Sci. 2013 Sep 1;126(Pt 17):3982-9. [Content Brief]

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