Absence of linkage between schizophrenia and the dopamine D4 receptor gene.
The dopamine D4 receptor gene and the closely placed tyrosine hydroxylase (TH) receptor gene are important candidate genes for schizophrenia; both are located on the short arm of chromosome 11. Multipoint linkage analyses excluded linkage of schizophrenia/schizoaffective disorder to both candidate genes in a sample of 15 multiplex and systematically recruited families. This result was not dependent on the definition of the affection status and on the specification of the mode of transmission (insofar as it is monogenic) of the disease. There was no evidence for a subgroup of families being linked. This result does not preclude the possibility that the D4 receptor gene or the TH gene has only a nonmajor effect on the genetic etiology of schizophrenia or that families in other populations are linked.
Maier
W
W
Department of Psychiatry, University of Mainz, Germany.
Schwab
S
S
Hallmayer
J
J
Ertl
M A
MA
Minges
J
J
Ackenheil
M
M
Lichtermann
D
D
Wildenauer
D
D
D005799:Genes, Dominant / Q000235:genetics; D005808:Genes, Recessive / Q000235:genetics; D008040:Genetic Linkage / Q000235:genetics*; D005819:Genetic Markers / Q000235:genetics; D006801:Humans; D010641:Phenotype; D016133:Polymerase Chain Reaction; D011954:Receptors, Dopamine / Q000235:genetics*; D017448:Receptors, Dopamine D2; D050638:Receptors, Dopamine D4; D012307:Risk Factors; D012559:Schizophrenia / Q000235:genetics*; D012565:Schizophrenic Psychology; D014446:Tyrosine 3-Monooxygenase / Q000235:genetics
C493599:DRD4 protein, human; D005819:Genetic Markers; D011954:Receptors, Dopamine; D017448:Receptors, Dopamine D2; D050638:Receptors, Dopamine D4; D014446:Tyrosine 3-Monooxygenase