POLR3A (RNA Polymerase III Subunit A): POLR3A is a key subunit of RNA polymerase III, the enzyme responsible for producing small RNAs such as tRNAs, 5S rRNA, and other non-coding RNAs. It plays an essential role in transcribing genes required for protein synthesis and other vital cellular processes. Mutations in POLR3A have been linked with neurological diseases and developmental disorders, underscoring its critical importance to cellular function and human health.