DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Specific peripheric component of RNA polymerase III which synthesizes small RNAs, such as 5S rRNA and tRNAs (PubMed:20154270). May direct with other members of the RPC3/POLR3C-RPC6/POLR3F-RPC7/POLR3G subcomplex RNA Pol III binding to the TFIIIB-DNA complex via the interactions between TFIIIB and POLR3F. May be involved either in the recruitment and stabilization of the subcomplex within RNA polymerase III, or in stimulating catalytic functions of other subunits during initiation. Plays a key role in sensing and limiting infection by intracellular bacteria and DNA viruses. Acts as nuclear and cytosolic DNA sensor involved in innate immune response. Can sense non-self dsDNA that serves as template for transcription into dsRNA. The non-self RNA polymerase III transcripts, such as Epstein-Barr virus-encoded RNAs (EBERs), induce type I interferon and NF- Kappa-B through the RIG-I pathway (PubMed:19609254, PubMed:19631370). Component of the RNA polymerase III (Pol III) complex consisting of 17 subunits (By similarity). RPC3/POLR3C, RPC6/POLR3F and RPC7/POLR3G form a Pol III subcomplex. Directly interacts with POLR3C/RPC62 (PubMed:21358628, PubMed:24107381, PubMed:26394183). Also found a trimeric complex with POLR3C and POLR3GL (PubMed:24107381). Excluded from nucleoli (PubMed:21898682). In zygotes and the 2-cell stage embryos, mainly in the cytoplasm. Starts to localize to the nucleus in the 8-16 cell stage embryo and early blastocysts (By similarity). Barely detectable in differentiated tissues. Expressed in embryonic stem cells and in other dividing cells, such as some tumor cell lines. Down-regulated in embryonic stem cells upon differentiation into embroid bodies (at protein level) (PubMed:20154270, PubMed:21898682, PubMed:28494942). An analogous down-regulation is observed during differentiation of induced pluripotent stem cells (PubMed:21898682). Induced by NANOG and POU5F1/OCT4 (PubMed:21898682). Negatively regulated by the interaction of microRNA MIR1305 with 3 miRNA responsive elements (miREs) in its 3'-UTR (PubMed:27339422). Belongs to the eukaryotic RPC7 RNA polymerase subunit family.