RNA polymerase I subunit A
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Diagnostic Grade (Green)
DDG2P
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknownDeafness and congenital structural abnormalities
MONOALLELIC, autosomal or pseudoautosomal, NOT imprintedFetal anomalies
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknownSkeletal dysplasia
MONOALLELIC, autosomal or pseudoautosomal, NOT imprintedClefting
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknownLimb disorders
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknownInherited white matter disorders
BIALLELIC, autosomal or pseudoautosomalWhite matter disorders and cerebral calcification - narrow panel
BIALLELIC, autosomal or pseudoautosomalChoanal atresia-deafness-cardiac defects-dysmorphism syndrome
acrofacial dysostosis Cincinnati type
leukodystrophy, hypomyelinating, 27
acrofacial dysostosis
microtia
Micrognathia
benign prostatic hyperplasia
neurodegenerative disease
hereditary disease
multiple congenital anomalies/dysmorphic syndrome
Score is the Open Targets composite evidence score (0-1). Higher = stronger gene-disease association.
DNA-directed RNA polymerase I subunit RPA1
Catalytic core component of RNA polymerase I (Pol I), a DNA-dependent RNA polymerase which synthesizes ribosomal RNA precursors using the four ribonucleoside triphosphates as substrates. Transcribes 47S pre-rRNAs from multicopy rRNA gene clusters, giving rise to 5.8S, 18S and 28S ribosomal RNAs (PubMed:11250903, PubMed:11283244, PubMed:16858408, PubMed:34671025, PubMed:34887565, PubMed:36271492). Pol I-mediated transcription cycle proceeds through transcription initiation, transcription elongation and transcription termination stages. During transcription initiation, Pol I pre-initiation complex (PIC) is recruited by the selectivity factor 1 (SL1/TIF-IB) complex bound to the core promoter that precedes an rDNA repeat unit. The PIC assembly bends the promoter favoring the formation of the transcription bubble and promoter escape. Once the polymerase has escaped from the promoter it enters the elongation phase during which RNA is actively polymerized, based on complementarity with the template DNA strand. Highly processive, assembles in structures referred to as 'Miller trees' where many elongating Pol I complexes queue and transcribe the same rDNA coding regions. At terminator sequences downstream of the rDNA gene, PTRF interacts with Pol I and halts Pol I transcription leading to the release of the RNA transcript and polymerase from the DNA (PubMed:11250903, PubMed:11283244, PubMed:16858408, PubMed:34671025, PubMed:34887565, PubMed:36271492). Forms Pol I active center together with the second largest subunit POLR1B/RPA2. Appends one nucleotide at a time to the 3' end of the nascent RNA, with POLR1A/RPA1 contributing a Mg(2+)-coordinating DxDGD motif, and POLR1B/RPA2 participating in the coordination of a second Mg(2+) ion and providing lysine residues believed to facilitate Watson-Crick base pairing between the incoming nucleotide and the template base. Typically, Mg(2+) ions direct a 5' nucleoside triphosphate to form a phosphodiester bond with the 3' hydroxyl of the preceding nucleotide of the nascent RNA, with the elimination of pyrophosphate. Has proofreading activity: Pauses and backtracks to allow the cleavage of a missincorporated nucleotide via POLR1H/RPA12. High Pol I processivity is associated with decreased transcription fidelity (By similarity) (PubMed:11250903, PubMed:11283244, PubMed:16858408, PubMed:34671025, PubMed:34887565, PubMed:36271492)
POLR1A · O95602
Mean pLDDT
80.1/ 100
Confident
1,720 residues
Confidence breakdown
AlphaFold (Jumper et al., 2021) · CC BY 4.0
