KPNB1
protein-codingkaryopherin subunit beta 1, the group of Armadillo repeat containing|Importins
Gene summary
Nucleocytoplasmic transport, a signal- and energy-dependent process, takes place through nuclear pore complexes embedded in the nuclear envelope. The import of proteins containing a nuclear localization signal (NLS) requires the NLS import receptor, a heterodimer of importin alpha and beta subunits also known as karyopherins. Importin alpha binds the NLS-containing cargo in the cytoplasm and importin beta docks the complex at the cytoplasmic side of the nuclear pore complex. In the presence of nucleoside triphosphates and the small GTP binding protein Ran, the complex moves into the nuclear pore complex and the importin subunits dissociate. Importin alpha enters the nucleoplasm with its passenger protein and importin beta remains at the pore. Interactions between importin beta and the FG repeats of nucleoporins are essential in translocation through the pore complex. The protein encoded by this gene is a member of the importin beta family. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Feb 2013]
MANE transcript
Inheritance
ClinVar variants
Top phenotype
gnomAD constraint
Max pathogenic AF
Genomic locus
External References & Databases
Transcript & Mutation Effects
hg38 • Region Span ~36.0 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 KPNB1 variants in ClinVar
ClinVar Variants & Pathogenicity by Type
Statistics based on transcript NM_002265.6. 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 | 1 | 1 | ||||
| missense | 32 | 1 | 33 | |||
| nonsense | 1 | 1 | ||||
| start loss | 0 | |||||
| frameshift | 1 | 1 | ||||
| splice donor/acceptor (+/-2bp) | 7 | 7 | ||||
| Total | 0 | 0 | 41 | 1 | 1 | 43 |
Transcript Catalog
Annotated transcript isoforms across RefSeq and Ensembl databases
| Transcript ID | Source | Protein ID | Coding Exons | MANE Status |
|---|---|---|---|---|
| RefSeq | NP_002256.2 | 22 | MANE Select | |
| Ensembl | ENSP00000290158.3 | 22 | MANE Select | |
| RefSeq | NP_001263382.1 | 19 | Standard | |
| Ensembl | ENSP00000438253.2 | 19 | Standard |
Gene Ontology (GO) Annotations & Pathways
Biological processes, molecular functions, cellular components and pathways
Pathways ConsensusPathDB
- RNA transport - Homo sapiens (human)
- Sterol Regulatory Element-Binding Proteins (SREBP) signalling
- Neutrophil degranulation
- Disease
- role of ran in mitotic spindle regulation
Biological Process
- obsolete protein import into nucleus, translocation
- apoptotic DNA fragmentation
- protein import into nucleus
- NLS-bearing protein import into nucleus
- ribosomal protein import into nucleus
Molecular Function
- RNA binding
- protein binding
- nuclear localization sequence binding
- zinc ion binding
- Ran GTPase binding
Cellular Component
- extracellular region
- nuclear envelope
- nuclear pore
- nucleoplasm
- cytoplasm
gnomAD Constraint
Source:
- Gene type
- protein_coding
- Transcript type
- protein_coding
- Transcript
- ENST00000290158
- Coding exons
- 21
- Length
- 36030
- Individuals with no LoFs
- 125723
- Homozygous LoFs
- 0
- Heterozygous LoFs
- 4
- Defined
- 125727
- p
- 0.0000159
| Z-Score | Observed | Expected | Observed/Expected | Mutation Rate | Total Possible | |
|---|---|---|---|---|---|---|
| Missense | 5.93 | 109 | 472 | 0.231 | 0.0000233 | 5745 |
| Missense (PolyPhen) | 10 | 137.84 | 0.072545 | 1661 | ||
| Synonymous | 0.804 | 161 | 175 | 0.923 | 0.00000878 | 1681 |
| Loss of Function | 6.54 | 1 | 51.8 | 0.0193 | 0.00000272 | 594 |
Population LoF Frequency
| Population | CAF | p-value | Status |
|---|---|---|---|
| African | 0 | 0.0 | absent |
| Latino/Admixed American | 0.000029 | 0.000029 | rare |
| Ashkenazi Jewish | 0 | 0.0 | absent |
| East Asian | 0.000055 | 0.000054 | rare |
| Finnish | 0 | 0.0 | absent |
| European (Non-Finnish) | 0.0000088 | 0.0000088 | rare |
| South Asian | 0.000033 | 0.000033 | rare |
| Other | 0 | 0.0 | absent |
dbNSFP Gene Annotations
Source:
- Function
- FUNCTION: Functions in nuclear protein import, either in association with an adapter protein, like an importin-alpha subunit, which binds to nuclear localization signals (NLS) in cargo substrates, or by acting as autonomous nuclear transport receptor. Acting autonomously, serves itself as NLS receptor. Docking of the importin/substrate complex to the nuclear pore complex (NPC) is mediated by KPNB1 through binding to nucleoporin FxFG repeats and the complex is subsequently translocated through the pore by an energy requiring, Ran-dependent mechanism. At the nucleoplasmic side of the NPC, Ran binds to importin-beta and the three components separate and importin-alpha and -beta are re- exported from the nucleus to the cytoplasm where GTP hydrolysis releases Ran from importin. The directionality of nuclear import is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus. Mediates autonomously the nuclear import of ribosomal proteins RPL23A, RPS7 and RPL5. Binds to a beta-like import receptor binding (BIB) domain of RPL23A. In association with IPO7 mediates the nuclear import of H1 histone. In vitro, mediates nuclear import of H2A, H2B, H3 and H4 histones. In case of HIV-1 infection, binds and mediates the nuclear import of HIV-1 Rev. Imports SNAI1 and PRKCI into the nucleus. {ECO:0000269|PubMed:10228156, ECO:0000269|PubMed:11891849, ECO:0000269|PubMed:19386897, ECO:0000269|PubMed:24699649, ECO:0000269|PubMed:9687515}.;
Recessive Scores
- pRec
- 0.559
Intolerance Scores
- LoFtool
- 0.0409
- RVIS EVS
- -0.62
- RVIS percentile EVS
- 17.16
Essentials
- Essential (CRISPR)
- E
- Essential (CRISPR2)
- E
- Essential (gene trap)
- E
- Indispensability pred.
- E
- Indispensability score
- 0.981
Gene Damage Prediction
| All | Recessive | Dominant | |
|---|---|---|---|
| Mendelian | Medium | Medium | Medium |
| Primary Immunodeficiency | Medium | Medium | Medium |
| Cancer | Medium | Medium | Medium |