HCAR2
protein-codinghydroxycarboxylic acid receptor 2, the group of Hydroxycarboxylic acid receptors
Gene summary
Predicted to enable nicotinic acid receptor activity. Involved in neutrophil apoptotic process and positive regulation of neutrophil apoptotic process. Located in cell junction and plasma membrane. [provided by Alliance of Genome Resources, Jul 2025]
- GPR109A
MANE transcript
Inheritance
ClinVar variants
Top phenotype
gnomAD constraint
Max pathogenic AF
Genomic locus
External References & Databases
Transcript & Mutation Effects
hg38 • Region Span ~2.1 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 HCAR2 variants in ClinVar
ClinVar Variants & Pathogenicity by Type
Statistics based on transcript NM_177551.4. 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 | 0 | |||||
| missense | 60 | 2 | 62 | |||
| nonsense | 0 | |||||
| start loss | 0 | |||||
| frameshift | 0 | |||||
| splice donor/acceptor (+/-2bp) | 0 | |||||
| Total | 0 | 0 | 60 | 2 | 0 | 62 |
Transcript Catalog
Annotated transcript isoforms across RefSeq and Ensembl databases
| Transcript ID | Source | Protein ID | Coding Exons | MANE Status |
|---|---|---|---|---|
| RefSeq | NP_808219.1 | 1 | MANE Select | |
| Ensembl | ENSP00000375066.2 | 1 | MANE Select |
Gene Ontology (GO) Annotations & Pathways
Biological processes, molecular functions, cellular components and pathways
Pathways ConsensusPathDB
- cAMP signaling pathway - Homo sapiens (human)
- Signaling by GPCR
- Signal Transduction
- Hydroxycarboxylic acid-binding receptors
- Class A/1 (Rhodopsin-like receptors)
Biological Process
- neutrophil apoptotic process
- G protein-coupled receptor signaling pathway
- positive regulation of neutrophil apoptotic process
- negative regulation of lipid catabolic process
- positive regulation of adiponectin secretion
Molecular Function
- nicotinic acid receptor activity
Cellular Component
- plasma membrane
- integral component of membrane
- cell junction
gnomAD Constraint
Source:
- Gene type
- protein_coding
- Transcript type
- protein_coding
- Transcript
- ENST00000328880
- Coding exons
- 1
- Length
- 2051
- Individuals with no LoFs
- 0
- Homozygous LoFs
- 0
- Heterozygous LoFs
- 0
- Defined
- 0
- p
- 0.00
| Z-Score | Observed | Expected | Observed/Expected | Mutation Rate | Total Possible | |
|---|---|---|---|---|---|---|
| Missense | -0.204 | 221 | 213 | 1.04 | 0.0000136 | 2399 |
| Missense (PolyPhen) | 44 | 60.005 | 0.73327 | 775 | ||
| Synonymous | -0.787 | 97 | 87.6 | 1.11 | 0.00000570 | 727 |
| Loss of Function | 0.349 | 6 | 7.00 | 0.858 | 3.91e-7 | 71 |
Population LoF Frequency
| Population | CAF | p-value | Status |
|---|---|---|---|
| African | 0 | 0.0 | absent |
| Latino/Admixed American | 0 | 0.0 | absent |
| Ashkenazi Jewish | 0 | 0.0 | absent |
| East Asian | 0 | 0.0 | absent |
| Finnish | 0 | 0.0 | absent |
| European (Non-Finnish) | 0 | 0.0 | absent |
| South Asian | 0 | 0.0 | absent |
| Other | 0 | 0.0 | absent |
dbNSFP Gene Annotations
Source:
- Function
- FUNCTION: Acts as a high affinity receptor for both nicotinic acid (also known as niacin) and (D)-beta-hydroxybutyrate and mediates increased adiponectin secretion and decreased lipolysis through G(i)-protein-mediated inhibition of adenylyl cyclase. This pharmacological effect requires nicotinic acid doses that are much higher than those provided by a normal diet. Mediates nicotinic acid-induced apoptosis in mature neutrophils. Receptor activation by nicotinic acid results in reduced cAMP levels which may affect activity of cAMP-dependent protein kinase A and phosphorylation of target proteins, leading to neutrophil apoptosis. The rank order of potency for the displacement of nicotinic acid binding is 5- methyl pyrazole-3-carboxylic acid = pyridine-3-acetic acid > acifran > 5-methyl nicotinic acid = acipimox >> nicotinuric acid = nicotinamide. {ECO:0000269|PubMed:17932499}.;
Intolerance Scores
- RVIS EVS
- -0.07
- RVIS percentile EVS
- 48.54
Essentials
- Essential (CRISPR)
- N
- Essential (CRISPR2)
- N
- Essential (gene trap)
- N
- Indispensability pred.
- N
- Indispensability score
- 0.114
Gene Damage Prediction
| All | Recessive | Dominant | |
|---|---|---|---|
| Mendelian | Medium | Medium | Medium |
| Primary Immunodeficiency | Medium | Medium | Medium |
| Cancer | Medium | Medium | Medium |