Nucleosome

Histones are crucial proteins around which DNA wraps to form nucleosomes, the fundamental units of chromatin structure in eukaryotic cells. This packaging allows the long DNA molecules to be compacted and fit within the cell nucleus. Histones play a pivotal role in regulating gene expression, as their chemical modifications can either promote or inhibit the accessibility of DNA to transcription factors and other regulatory proteins. By modulating the chromatin structure, histones influence various DNA-related processes such as replication, repair, and transcription. The dynamic interaction between histones and DNA is essential for maintaining genome stability and regulating cellular functions, making histones key players in gene regulation and a target for cancer therapies involving epigenetic mechanisms.