Host cell chromatin

Host cell chromatin is the macromolecular complex of DNA, histones, and non-histone proteins that constitutes the genetic material within the nucleus of eukaryotic cells. Its fundamental role is to package the genome into a compact structure, thereby protecting DNA integrity and regulating access to the genetic code for processes such as transcription, replication, and repair (Alberts et al., Molecular Biology of the Cell; Luger et al., Nature 1997). In many viral infections, such as HIV-1, the virus must interact with and integrate into the host cell chromatin to establish a productive infection or long-term latency (Lusic & Siliciano, Nature Reviews Microbiology 2017). In oncology, dysregulation of chromatin structure and epigenetic modifications is a hallmark of cancer, leading to the silencing of tumor suppressor genes or the activation of oncogenes (Baylin & Jones, Nature Reviews Genetics 2011). Therapeutic interventions targeting chromatin include DNA-binding agents like doxorubicin, which intercalate into the DNA helix, and epigenetic drugs like HDAC inhibitors that modify the protein components to alter gene expression (Jones et al., Nature Reviews Genetics 2016). These treatments aim to either directly damage the DNA of rapidly dividing cells or restore a normal epigenetic landscape to reverse disease phenotypes. However, because chromatin is essential for all cellular functions, targeting it often results in significant systemic toxicity and potential long-term safety concerns.

Other names

ChromatinNucleoprotein complexGenomic DNA-protein complexNuclear chromatin

DNA intercalation, DNA alkylation, Histone deacetylase inhibition, and DNA methyltransferase inhibition