The function of POLR1G (RNA polymerase I subunit G, Ensembl gene identifier ENSG00000117877) is as follows. Component of RNA polymerase I (Pol I), a DNA-dependent RNA polymerase which synthesizes ribosomal RNA precursors using the four ribonucleoside triphosphates as substrates. Involved in UBTF-activated transcription, presumably at a step following PIC formation. {ECO:0000269|PubMed:34671025, ECO:0000269|PubMed:34887565, ECO:0000269|PubMed:36271492}. [Isoform 2]: Has been described as a component of preformed T-cell receptor (TCR) complex. .