POLB
protein-codingDNA polymerase beta, the group of DNA polymerases
Gene summary
The protein encoded by this gene is a DNA polymerase involved in base excision and repair, also called gap-filling DNA synthesis. The encoded protein, acting as a monomer, is normally found in the cytoplasm, but it translocates to the nucleus upon DNA damage. Several transcript variants of this gene exist, but the full-length nature of only one has been described to date. [provided by RefSeq, Sep 2011]
MANE transcript
Inheritance
ClinVar variants
Top phenotype
gnomAD constraint
Max pathogenic AF
Genomic locus
External References & Databases
Transcript & Mutation Effects
hg38 • Region Span ~33.4 kbGenCC Phenotypes & Disease Associations
Curated gene-disease validity assertions and inheritance patterns
No GenCC data available for this gene.
ClinVar Associated Diseases & Phenotypes
Reported disease conditions connected to POLB variants in ClinVar
ClinVar Variants & Pathogenicity by Type
Statistics based on transcript NM_002690.3. Only rare variants are included.
We include only reliable ClinVar variants with their consequences to MANE Select, MANE Plus Clinical transcripts, or transcripts with TSL equal to 1. Click a count to filter the variants table below.
Slight differences between displayed counts and ClinVar may occur due to a different transcript/consequence chosen by our variant effect predictor, or because we classify Benign/Likely benign as Likely benign and Pathogenic/Likely pathogenic as Likely pathogenic.
| Effect | PathogenicP | Likely pathogenicLP | VUS | Likely benignLB | BenignB | Sum |
|---|---|---|---|---|---|---|
| synonymous | 0 | |||||
| missense | 18 | 18 | ||||
| nonsense | 0 | |||||
| start loss | 0 | |||||
| frameshift | 0 | |||||
| splice donor/acceptor (+/-2bp) | 8 | 8 | ||||
| Total | 0 | 0 | 26 | 0 | 0 | 26 |
Transcript Catalog
Annotated transcript isoforms across RefSeq and Ensembl databases
| Transcript ID | Source | Protein ID | Coding Exons | MANE Status |
|---|---|---|---|---|
| RefSeq | NP_002681.1 | 14 | MANE Select | |
| Ensembl | ENSP00000265421.4 | 14 | MANE Select | |
| Ensembl | ENSP00000428144.1 | 3 | Standard | |
| Ensembl | ENSP00000430478.1 | 8 | Standard |
Model Organisms & Knockout Phenotypes
Observed phenotypic effects in mouse and zebrafish models
| Gene / Model | Organism | Observed Phenotype |
|---|---|---|
| polb | Danio rerio | Structure: anatomical system Quality: quality abnormal |
Gene Ontology (GO) Annotations & Pathways
Biological processes, molecular functions, cellular components and pathways
Pathways ConsensusPathDB
- Base excision repair - Homo sapiens (human)
- HTLV-I infection - Homo sapiens (human)
- Viral carcinogenesis - Homo sapiens (human)
- Nucleotide Metabolism
- DNA Repair
Biological Process
- DNA repair
- base-excision repair
- base-excision repair, base-free sugar-phosphate removal
- base-excision repair, gap-filling
- base-excision repair, DNA ligation
Molecular Function
- damaged DNA binding
- DNA-directed DNA polymerase activity
- DNA-(apurinic or apyrimidinic site) endonuclease activity
- protein binding
- microtubule binding
Cellular Component
- nucleus
- nucleoplasm
- cytoplasm
- microtubule
- spindle microtubule
gnomAD Constraint
Source:
- Gene type
- protein_coding
- Transcript type
- protein_coding
- Transcript
- ENST00000265421
- Coding exons
- 14
- Length
- 33355
- Individuals with no LoFs
- 125733
- Homozygous LoFs
- 0
- Heterozygous LoFs
- 14
- Defined
- 125747
- p
- 0.0000557
| Z-Score | Observed | Expected | Observed/Expected | Mutation Rate | Total Possible | |
|---|---|---|---|---|---|---|
| Missense | 1.57 | 119 | 178 | 0.669 | 0.00000890 | 2210 |
| Missense (PolyPhen) | 28 | 48.661 | 0.57541 | 614 | ||
| Synonymous | 0.458 | 55 | 59.5 | 0.924 | 0.00000275 | 584 |
| Loss of Function | 2.26 | 11 | 22.6 | 0.487 | 0.00000110 | 290 |
Population LoF Frequency
| Population | CAF | p-value | Status |
|---|---|---|---|
| African | 0.000062 | 0.000062 | rare |
| Latino/Admixed American | 0.000029 | 0.000029 | rare |
| Ashkenazi Jewish | 0 | 0.0 | absent |
| East Asian | 0.000054 | 0.000054 | rare |
| Finnish | 0 | 0.0 | absent |
| European (Non-Finnish) | 0.000098 | 0.000097 | rare |
| South Asian | 0 | 0.0 | absent |
| Other | 0 | 0.0 | absent |
dbNSFP Gene Annotations
Source:
- Function
- FUNCTION: Repair polymerase that plays a key role in base-excision repair. Has 5'-deoxyribose-5-phosphate lyase (dRP lyase) activity that removes the 5' sugar phosphate and also acts as a DNA polymerase that adds one nucleotide to the 3' end of the arising single-nucleotide gap. Conducts 'gap-filling' DNA synthesis in a stepwise distributive fashion rather than in a processive fashion as for other DNA polymerases. {ECO:0000269|PubMed:11805079, ECO:0000269|PubMed:21362556, ECO:0000269|PubMed:9207062, ECO:0000269|PubMed:9572863}.;
Recessive Scores
- pRec
- 0.313
Intolerance Scores
- LoFtool
- 0.782
- RVIS EVS
- -0.07
- RVIS percentile EVS
- 48.12
Essentials
- Essential (CRISPR)
- N
- Essential (CRISPR2)
- N
- Essential (gene trap)
- N
- Indispensability pred.
- E
- Indispensability score
- 0.973
Gene Damage Prediction
| All | Recessive | Dominant | |
|---|---|---|---|
| Mendelian | Medium | Medium | Medium |
| Primary Immunodeficiency | Medium | Medium | Medium |
| Cancer | Medium | Medium | Medium |