POLR2G (RNA Polymerase II, Subunit G) is a gene in humans that encodes one of the subunits of RNA polymerase II (RNA Pol II), a crucial enzyme responsible for transcribing messenger RNA (mRNA) from DNA templates.
RNA Polymerase II is a multi-subunit enzyme that orchestrates the transcription of protein-coding genes and some small RNA genes in eukaryotes. The enzyme typically consists of 12 distinct subunits, often referred to as RPB1 through RPB12 (RNA Polymerase B Subunit 1-12). POLR2G specifically encodes the RPB7 subunit.
Function: The RPB7 subunit, encoded by POLR2G, is an integral component of the RNA Pol II core complex. While it is one of the smaller subunits, it plays a role in the overall stability and proper assembly of the enzyme. It is believed to contribute to the structural integrity of the polymerase and may be involved in modulating its activity, particularly in association with other subunits like RPB3, RPB5, and RPB8. Its precise individual contribution to catalytic activity is less direct than the large catalytic subunits (RPB1 and RPB2), but it is essential for the enzyme's full functionality and efficient transcription.
Gene Location: In humans, the POLR2G gene is located on chromosome 17 at position 17q12.
Clinical Significance: As a core component of RNA Polymerase II, POLR2G is vital for fundamental cellular processes. Dysregulation or mutation of this gene would likely have broad and severe impacts on gene expression and cellular viability, given RNA Pol II's central role in transcription. While not commonly associated with specific genetic diseases as a primary cause, its proper function is indispensable for healthy cellular operation.
See Also:
- RNA Polymerase II
- Gene Expression
- Transcription