CLDN18
protein-codingclaudin 18, the group of Claudins
Gene summary
This gene encodes a member of the claudin family. Claudins are integral membrane proteins and components of tight junction strands. Tight junction strands serve as a physical barrier to prevent solutes and water from passing freely through the paracellular space between epithelial or endothelial cell sheets, and also play critical roles in maintaining cell polarity and signal transductions. This gene is upregulated in patients with ulcerative colitis and highly overexpressed in infiltrating ductal adenocarcinomas. PKC/MAPK/AP-1 (protein kinase C/mitogen-activated protein kinase/activator protein-1) dependent pathway regulates the expression of this gene in gastric cells. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jun 2010]
- SFTPJ
MANE transcript
Inheritance
ClinVar variants
Top phenotype
gnomAD constraint
Max pathogenic AF
Genomic locus
External References & Databases
Transcript & Mutation Effects
hg38 • Region Span ~34.9 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 CLDN18 variants in ClinVar
ClinVar Variants & Pathogenicity by Type
Statistics based on transcript NM_016369.4. 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 | 36 | 2 | 38 | |||
| nonsense | 0 | |||||
| start loss | 0 | |||||
| frameshift | 0 | |||||
| splice donor/acceptor (+/-2bp) | 0 | |||||
| Total | 0 | 0 | 37 | 2 | 0 | 39 |
Transcript Catalog
Annotated transcript isoforms across RefSeq and Ensembl databases
| Transcript ID | Source | Protein ID | Coding Exons | MANE Status |
|---|---|---|---|---|
| RefSeq | NP_057453.1 | 5 | MANE Select | |
| Ensembl | ENSP00000183605.5 | 5 | MANE Select | |
| RefSeq | NP_001002026.1 | 5 | Standard | |
| Ensembl | ENSP00000340939.4 | 5 | Standard |
Gene Ontology (GO) Annotations & Pathways
Biological processes, molecular functions, cellular components and pathways
Pathways ConsensusPathDB
- Cell adhesion molecules (CAMs) - Homo sapiens (human)
- Tight junction - Homo sapiens (human)
- Hepatitis C - Homo sapiens (human)
- Leukocyte transendothelial migration - Homo sapiens (human)
- EMT transition in Colorectal Cancer
Biological Process
- calcium-independent cell-cell adhesion via plasma membrane cell-adhesion molecules
- response to ethanol
- negative regulation of bone resorption
- digestive tract development
- TNFSF11-mediated signaling pathway
Molecular Function
- structural molecule activity
- identical protein binding
Cellular Component
- plasma membrane
- bicellular tight junction
- integral component of membrane
gnomAD Constraint
Source:
- Gene type
- protein_coding
- Transcript type
- protein_coding
- Transcript
- ENST00000183605
- Coding exons
- 5
- Length
- 34918
- Individuals with no LoFs
- 125701
- Homozygous LoFs
- 0
- Heterozygous LoFs
- 47
- Defined
- 125748
- p
- 0.000187
| Z-Score | Observed | Expected | Observed/Expected | Mutation Rate | Total Possible | |
|---|---|---|---|---|---|---|
| Missense | 0.607 | 135 | 156 | 0.863 | 0.00000867 | 1681 |
| Missense (PolyPhen) | 43 | 53.533 | 0.80324 | 590 | ||
| Synonymous | 0.414 | 61 | 65.3 | 0.935 | 0.00000439 | 533 |
| Loss of Function | 0.956 | 7 | 10.3 | 0.679 | 5.25e-7 | 110 |
Population LoF Frequency
| Population | CAF | p-value | Status |
|---|---|---|---|
| African | 0.000062 | 0.000062 | rare |
| Latino/Admixed American | 0.00084 | 0.00081 | rare |
| Ashkenazi Jewish | 0 | 0.0 | absent |
| East Asian | 0.000054 | 0.000054 | rare |
| Finnish | 0.00023 | 0.00023 | rare |
| European (Non-Finnish) | 0.000054 | 0.000053 | rare |
| South Asian | 0.00020 | 0.00020 | rare |
| Other | 0 | 0.0 | absent |
dbNSFP Gene Annotations
Source:
- Function
- FUNCTION: Plays a major role in tight junction-specific obliteration of the intercellular space, through calcium- independent cell-adhesion activity. {ECO:0000250}.;
Recessive Scores
- pRec
- 0.128
Intolerance Scores
- LoFtool
- 0.209
- RVIS EVS
- 0.44
- RVIS percentile EVS
- 77.8
Essentials
- Essential (CRISPR)
- N
- Essential (CRISPR2)
- N
- Essential (gene trap)
- N
- Indispensability pred.
- N
- Indispensability score
- 0.210
Gene Damage Prediction
| All | Recessive | Dominant | |
|---|---|---|---|
| Mendelian | Medium | Medium | Medium |
| Primary Immunodeficiency | Medium | Medium | Medium |
| Cancer | Medium | Medium | Medium |