title: Dopamine receptor D1 gene -48A/G polymorphism is associated with bipolar illness but not with schizophrenia in a Polish population.
abstract: Dysregulation of dopaminergic neurotransmission has been implicated in the etiology of major psychoses. The dopamine D(1) receptor (DRD1) plays a role in some brain functions and mechanisms of psychotropic drugs. Therefore, the DRD1 gene makes a good candidate gene for molecular genetic studies in schizophrenia and bipolar affective disorder. In the present study, the -48A/G polymorphism of the DRD1 gene was estimated in patients with schizophrenia (n=407) or bipolar affective disorder (n=380), and in healthy controls (n=399). No association was found between the polymorphism studied and schizophrenia, either in the whole group of patients or in subgroups divided by gender, age at onset or predominance of positive or negative symptoms. A statistical trend was obtained for an association between this polymorphism and bipolar affective disorder (p=0.059 for genotypes, p=0.073 for alleles). The G/G genotype and G allele were significantly more frequent in patients with bipolar disorder, type II (p=0.016 for genotypes, p=0.008 for alleles), especially in the women subgroup (p=0.054 for genotypes, p=0.024 for alleles). An association between the G/G genotype and bipolar affective disorder with disease onset after 18 years of age was also found (p=0.022). These data suggest that the -48A/G polymorphism of the DRD1 gene may be involved in the etiology of bipolar disorder in a Polish population.
authors.affiliation: Laboratory of Psychiatric Genetics, Department of Psychiatry, Poznan University of Medical Sciences, Poznan, Poland. mweglarz2003@yahoo.com
authors.forename: Monika
authors.initials: M
authors.lastname: Dmitrzak-Weglarz
authors.forename: Janusz K
authors.initials: JK
authors.lastname: Rybakowski
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Slopien
authors.forename: Piotr M
authors.initials: PM
authors.lastname: Czerski
authors.forename: Anna
authors.initials: A
authors.lastname: Leszczynska-Rodziewicz
authors.forename: Pawel
authors.initials: P
authors.lastname: Kapelski
authors.forename: Magdalena
authors.initials: M
authors.lastname: Kaczmarkiewicz-Fass
authors.forename: Joanna
authors.initials: J
authors.lastname: Hauser
mesh_terms: D000328:Adult; D019943:Amino Acid Substitution; D001714:Bipolar Disorder / Q000145:classification / Q000235:genetics*; D016022:Case-Control Studies; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005828:Genetics, Population / Q000706:statistics & numerical data*; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D011044:Poland; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D017447:Receptors, Dopamine D1 / Q000235:genetics*; D012016:Reference Values; D012559:Schizophrenia / Q000235:genetics*; D012737:Sex Factors
chemical_list: D017447:Receptors, Dopamine D1