Homeobox-containing protein 1 (HMBOX1)

Homeobox-containing protein 1 (HMBOX1) is a transcription factor and telomere-binding protein encoded by the HMBOX1 gene in humans[1][3][5]. It directly binds telomeric DNA repeats and is crucial for telomerase recruitment and telomere elongation[1][2][5]. Originally described as a transcriptional repressor, HMBOX1 mainly regulates telomere maintenance and genomic stability through chromatin binding and interaction with the telomerase complex. It also promotes differentiation of bone marrow stromal stem cells into endothelial cells and supports endothelial cell survival by modulating apoptosis and autophagy pathways[3]. HMBOX1 exhibits complex roles in immunity, acting as an anti-inflammatory mediator in hepatocytes and NK cells[3]. In cancer, HMBOX1 can act as a tumor suppressor (by stimulating apoptosis and autophagy) but may also contribute to tumor progression in specific contexts, with effects that vary depending on cancer type and microenvironment[3]. The protein is currently not targeted by approved drugs, and interventions are limited to gene-level manipulation as research on small molecule inhibitors is lacking[3]. HMBOX1's involvement in telomere biology and diverse regulatory functions makes it an emerging candidate for further study in cancer, inflammatory, and cardiovascular diseases[1][3][5].

Other names

Homeobox telomere-binding protein 1HOT1TAH1HNF1LAPBHNFFLJ21616Telomere-associated homeobox-containing protein 1