DNA-directed RNA polymerase II subunit J2 (POLR2J2)

DNA-directed RNA polymerase II subunit J2 (POLR2J2) is a putative protein-coding gene belonging to the RNA polymerase II subunit 11 gene family, located within a cluster on chromosome 7q22.1 in humans[1][3][5]. While the closely related gene POLR2J1 (encoding RPB11a) is a confirmed core subunit of RNA polymerase II, POLR2J2 produces multiple, alternatively spliced transcripts, the majority of which include non-coding exons at the 3' end and are candidates for nonsense-mediated decay[1][3][5]. As a result, it remains unknown if POLR2J2 expresses any protein in vivo, and its biological function is not well-established. The canonical role of RNA polymerase II is the transcription of DNA into messenger RNA (mRNA), a central process required for gene expression in all eukaryotic cells[3][7]. RNA polymerase II consists of multiple subunits with POLR2J/11-type subunits providing core structural and regulatory capabilities—these cooperate in transcription initiation and promoter clearance[3]. Experimental data from related isoforms suggest potential involvement in transcription factor interaction, specifically with ATF4, but the exact physiological relevance for POLR2J2 remains unknown[2]. There is limited if any disease association, and no evidence to support drug targeting or biomarker utility for POLR2J2. In summary, POLR2J2 is related to the transcriptional machinery, but its in vivo expression and function are uncertain. It is part of an enzyme complex rather than a classical receptor or transporter, and is not currently considered a direct therapeutic target nor associated with major safety considerations[1][3][5].

Other names

polymerase (RNA) II (DNA directed) polypeptide J2HRPB11BRPB11b1RNA polymerase II subunit J2polymerase (RNA) II subunit J2POLR2J3RPB11b2