General gene transcription machinery (GTM)

The general gene transcription machinery is a fundamental multi-protein assembly required for the initiation and elongation of RNA synthesis in eukaryotic cells. It is centered around RNA polymerase II (Pol II) and includes a suite of general transcription factors such as TFIIA, TFIIB, TFIID, TFIIE, TFIIF, and TFIIH, which together form the pre-initiation complex (PIC) at core promoter regions (Source: Nature Reviews Molecular Cell Biology, 2015, PMID: 25694339). This machinery facilitates the unwinding of DNA, the selection of the transcription start site, and the transition into productive elongation. In oncology, many tumors exhibit "transcriptional addiction," where they become disproportionately dependent on the GTM to maintain the expression of key oncogenes like MYC (Source: Cell, 2017, PMID: 28187285). Consequently, components of the GTM, such as the CDK7 subunit of TFIIH, have emerged as viable therapeutic targets for small-molecule inhibitors like THZ1 (Source: Nature, 2014, PMID: 25043025). While targeting such a universal process poses risks of systemic toxicity, the differential sensitivity of cancer cells provides a potential therapeutic window for treating aggressive malignancies.

Other names

Basal transcription machineryRNA polymerase II holoenzymePre-initiation complexPICCore transcription machinery

Inhibition of RNA polymerase II enzymatic activity or disruption of the assembly of general transcription factors (GTFs) such as TFIIH and TFIID to prevent mRNA synthesis.