HMBOX1
Homeobox containing 1, also known as homeobox telomere-binding protein 1 (HOT1), is a protein that in humans is encoded by the HMBOX1 gene.[3] HMBOX1 directly binds to the double-stranded repeat sequence of telomeres.[4][5]
HMBOX1 has originally been identified to associate with telomeric chromatin in telomerase-positive cancer cells and cancer cells that maintain their telomeres based on the Alternative Lengthening of Telomeres (ALT) mechanism by the 'reverse ChIP' technique PICh (Proteomics of Isolated Chromatin segments).[4] Subsequently, direct binding to telomeric DNA was demonstrated through a co-crystal structure of the DNA-binding domain of HMBOX1 with telomeric DNA.[5] Loss-of-function and gain-of-function experiments classify HMBOX1 as a positive regulator of telomere length.[5][6] HMBOX1 had originally been described as a transcriptional repressor based on reporter gene assays[7], but genome-wide approaches using RNA-seq and ChIP-seq see little to no such effect at least in several cancer cell lines.[8]
References
- ↑ "Human PubMed Reference:".
- ↑ "Mouse PubMed Reference:".
- ↑ "Entrez Gene: Homeobox containing 1".
- 1 2 Déjardin J, Kingston RE (January 2009). "Purification of proteins associated with specific genomic Loci". Cell. 136 (1): 175–86. PMC 3395431
. PMID 19135898. doi:10.1016/j.cell.2008.11.045. - 1 2 3 Kappei D, Butter F, Benda C, Scheibe M, Draškovič I, Stevense M, Novo CL, Basquin C, Araki M, Araki K, Krastev DB, Kittler R, Jessberger R, Londoño-Vallejo JA, Mann M, Buchholz F (June 2013). "HOT1 is a mammalian direct telomere repeat-binding protein contributing to telomerase recruitment". The EMBO Journal. 32 (12): 1681–701. PMC 3680732 . PMID 23685356. doi:10.1038/emboj.2013.105.
- ↑ Zhou S, Xiao Y, Zhuang Y, Liu Y, Zhao H, Yang H, Xie C, Zhou F, Zhou Y (July 2017). "Knockdown of homeobox containing 1 increases the radiosensitivity of cervical cancer cells through telomere shortening". Oncology Reports. 38 (1): 515–521. PMID 28628186. doi:10.3892/or.2017.5707.
- ↑ Chen S, Saiyin H, Zeng X, Xi J, Liu X, Li X, Yu L (2006). "Isolation and functional analysis of human HMBOX1, a homeobox containing protein with transcriptional repressor activity". Cytogenetic and Genome Research. 114 (2): 131–6. PMID 16825764. doi:10.1159/000093328.
- ↑ Jahn A, Rane G, Paszkowski-Rogacz M, Sayols S, Bluhm A, Han CT, Draškovič I, Londoño-Vallejo JA, Kumar AP, Buchholz F, Butter F, Kappei D (June 2017). "ZBTB48 is both a vertebrate telomere-binding protein and a transcriptional activator". EMBO Reports. 18 (6): 929–946. PMC 5452029 . PMID 28500257. doi:10.15252/embr.201744095.