DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Common component of RNA polymerases I and III which synthesize ribosomal RNA precursors and short non-coding RNAs including 5S rRNA, snRNAs, tRNAs and miRNAs, respectively. {ECO:0000250|UniProtKB:P28000, ECO:0000269|PubMed:20413673, ECO:0000269|PubMed:34671025, ECO:0000269|PubMed:34887565, ECO:0000269|PubMed:35637192, ECO:0000269|PubMed:36271492}. This is the function of Ensembl gene identifier ENSG00000186184 (POLR1D, RNA polymerase I and III subunit D).