Dopamine receptor D4

DRD4
Identifiers
Aliases DRD4, D4DR, dopamine receptor D4
External IDs MGI: 94926 HomoloGene: 20215 GeneCards: DRD4
Targeted by Drug
PF-592379, rotigotine, a-412997, abt-670, dopamine, fenoldopam, quinpirole, way-100635, apomorphine, cabergoline, lisuride, pergolide, roxindole, bromocriptine, (+)-butaclamol, chlorpromazine, clozapine, eticlopride, haloperidol, L745870, loxapine, nemonapride, perospirone, piribedil, prochlorperazine, sertindole, sonepiprazole, spiperone, levosulpiride, terguride, trifluoperazine, zotepine[1]
RNA expression pattern
More reference expression data
Orthologs
Species Human Mouse
Entrez

1815

13491

Ensembl

n/a

ENSMUSG00000025496

UniProt

P21917

P51436

RefSeq (mRNA)

NM_000797

NM_007878

RefSeq (protein)

NP_000788.2

NP_031904.1

Location (UCSC) Chr 11: 0.64 – 0.64 Mb Chr 7: 141.29 – 141.29 Mb
PubMed search [2] [3]
Wikidata
View/Edit HumanView/Edit Mouse

The dopamine receptor D4 is a G protein-coupled receptor encoded by the DRD4 gene.[4]

As with other dopamine receptor subtypes, the D4 receptor is activated by the neurotransmitter dopamine. It is linked to many neurological and psychiatric conditions[5] including schizophrenia and bipolar disorder,[6] addictive behaviors,[7] Parkinson's disease,[8] and eating disorders such as anorexia nervosa.[9]

It is also a target for drugs which treat schizophrenia and Parkinson disease.[10] The D4 receptor is considered to be D2-like in which the activated receptor inhibits the enzyme adenylate cyclase, thereby reducing the intracellular concentration of the second messenger cyclic AMP.[11]

Genetics

The human protein is coded by the DRD4 on chromosome 11 located in 11p15.5.

There are slight variations (mutations/polymorphisms) in the human gene:

Mutations in this gene have been associated with various behavioral phenotypes, including autonomic nervous system dysfunction, attention deficit/hyperactivity disorder,[13] schizophrenia,[14] and the personality trait of novelty seeking.[15]

48-base pair VNTR

The 48-base pair variable number tandem repeat (VNTR) in exon 3 range from 2 to 11 repeats.

DRD4-7R, the 7-repeat (7R) variant of DRD4, has been linked to a susceptibility for developing ADHD in several meta-analyses and other psychological traits and disorders.[16][17]

The frequency of the alleles varies greatly between populations, e.g., the 7-repeat version has high incidence in America and low in Asia.[18] "Long" versions of polymorphisms are the alleles with 6 to 10 repeats. 7R appears to react less strongly to dopamine molecules.[19]

The 48-base pair VNTR has been the subject of much speculation about its evolution and role in human behaviors cross-culturally. The 7R allele appears to have been selected for about 40,000 years ago.[18] In 1999 Chen and colleagues[20] observed that populations who migrated farther in the past 30,000 to 1,000 years ago had a higher frequency of 7R/long alleles. They also showed that nomadic populations had higher frequencies of 7R alleles than sedentary ones. More recently it was observed that the health status of nomadic Ariaal men was higher if they had 7R alleles. However, in recently sedentary (non-nomadic) Ariaal those with 7R alleles seemed to have slightly deteriorated health.[21]

Novelty seeking

Despite early findings of an association between the DRD4 48bp VNTR and novelty seeking (a normal characteristic of exploratory and excitable people),[22][23] a 2008 meta-analysis compared 36 published studies of novelty seeking and the polymorphism and found no effect. The meta-analysis of 11 studies did find that another polymorphism in the gene, the -521C/T, showed an association with novelty seeking.[15] While human results are controversial, an increasing body of animal evidence has linked DRD4 variants with novelty seeking, e.g.,,,[24][25][26][27][28] and new evidence suggests that human encroachment may exert selection pressure in favor of DRD4 variants associated with novelty seeking.[29] Novelty-seeking behavior is probably mediated by several genes, and the variance attributable to DRD4 by itself is not particularly large.

Cognitive development

Several studies have suggested that parenting may affect the cognitive development of children with the 7-repeat allele of DRD4.[29] Parenting that has maternal sensitivity, mindfulness, and autonomy–support at 15 months was found to alter children's executive functions at 18 to 20 months.[29] Children with poorer quality parenting were more impulsive and sensation seeking than those with higher quality parenting.[29] Higher quality parenting was associated with better executive control in 4-year-olds.[29]

Ligands

Chemical structures of representative D4-preferring ligands.

Agonists

Antagonists

Inverse agonists

See also

References

  1. "Drugs that physically interact with D(4) dopamine receptor view/edit references on wikidata".
  2. "Human PubMed Reference:".
  3. "Mouse PubMed Reference:".
  4. Van Tol HH, Bunzow JR, Guan HC, Sunahara RK, Seeman P, Niznik HB, Civelli O (1991). "Cloning of the gene for a human dopamine D4 receptor with high affinity for the antipsychotic clozapine". Nature. 350 (6319): 610–4. doi:10.1038/350610a0. PMID 1840645.
  5. Ptácek R, Kuzelová H, Stefano GB (2011). "Dopamine D4 receptor gene DRD4 and its association with psychiatric disorders". Medical Science Monitor. 17 (9): RA215–20. doi:10.12659/MSM.881925. PMC 3560519Freely accessible. PMID 21873960.
  6. Domschke K (2013). "Clinical and molecular genetics of psychotic depression". Schizophrenia Bulletin. 39 (4): 766–75. doi:10.1093/schbul/sbt040. PMC 3686457Freely accessible. PMID 23512949.
  7. McGeary J (2009). "The DRD4 exon 3 VNTR polymorphism and addiction-related phenotypes: a review". Pharmacology, Biochemistry, and Behavior. 93 (3): 222–9. doi:10.1016/j.pbb.2009.03.010. PMC 2706302Freely accessible. PMID 19336242.
  8. Cormier F, Muellner J, Corvol JC (2013). "Genetics of impulse control disorders in Parkinson's disease". Journal of Neural Transmission. 120 (4): 665–71. doi:10.1007/s00702-012-0934-4. PMID 23232665.
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  12. Catalano M, Nobile M, Novelli E, Nöthen MM, Smeraldi E (1993). "Distribution of a novel mutation in the first exon of the human dopamine D4 receptor gene in psychotic patients". Biological Psychiatry. 34 (7): 459–64. doi:10.1016/0006-3223(93)90236-7. PMID 8268330.
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