Gene Information
Gene NameHRH3
OrganismHomo sapiens (Human)
Gene Length445
Protein NamesHistamine H3 receptor (H3R) (HH3R) (G-protein coupled receptor 97)
Target Namehistamine h3 receptor
Target TypeNA
Gene Age424 ( ENSG00000101180 )
Evolutionary StageEumetazoa
AlphaFoldDBQ9Y5N1
Gene CardHRH3
Uniprot IDQ9Y5N1
PfamPF00001
In ASDyes
Allosteric Predictionyes (1.551836554)
Ortholog in AnimalsAlpaca_ HRH3 ( ortholog_one2one )
Dog_ HRH3 ( ortholog_one2one )
GuineaPig_ HRH3 ( ortholog_one2one )
Macaque_ HRH3 ( ortholog_one2one )
Mouse_ Hrh3 ( ortholog_one2one )
Pig_ HRH3 ( ortholog_one2one )
Rat_ Hrh3 ( ortholog_one2one )
OhnologsHRH4
ParalogsHRH2, TAAR6, DRD4, HRH1, DRD1, GPR52, HTR1A, HTR1D, CHRM3, CHRM4, TAAR5, HTR4, TAAR1, GPR21, CHRM1, HRH4, TAAR9, CHRM5, TAAR8, DRD3, GPR84, CHRM2, GPR161, DRD5, TAAR2
Tissuecaudate.nucleus, diencephalon, putamen, thalamus, cerebellar.hemisphere, cerebellum, cerebral.cortex, hypothalamus, nucleus.accumbens
Tissue SpecificityExpressed predominantly in the CNS, with the greatest expression in the thalamus and caudate nucleus. The various isoforms are mainly coexpressed in brain, but their relative expression level varies in a region-specific manner. Isoform 3 and isoform 7 are highly expressed in the thalamus, caudate nucleus and cerebellum while isoform 5 and isoform 6 show a poor expression. Isoform 5 and isoform 6 show a high expression in the amygdala, substantia nigra, cerebral cortex and hypothalamus. Isoform 7 is not found in hypothalamus or substantia nigra.
Pharmacological Animal ModelsNA
Gene Ontology
(biological process)
Gene Ontology
(cellular component)
Gene Ontology
(molecular function)
PDB NA 
DBSNP rs752380770 
Subcellular location [CC]Cell membrane;
Multi-pass membrane protein.
Mouse PG classificationNA
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