title: Association of MDR1 C3435T polymorphism with bipolar disorder in patients treated with valproic acid.
abstract: P-glycoprotein (P-gp), an efflux transporter protein, is an ABC transporter encoded by the multidrug resistance 1 gene (MDR1, ABCB1). The common synonymous C3435T polymorphism in exon 26 is reported to associate with lower P-gp functional expression and drug uptake. Many extended pharmacogenomics, functional, and complex disease association studies focused mainly on this polymorphism. We investigated the association of exon 26 C3435T genetic variants of MDR1 gene with susceptibility to bipolar disorder and serum valproic acid concentration. Totally, 104 patients meeting DSM-IV criteria for bipolar disorder and 169 controls were admitted to the study. There was statistically significant difference between the genotypes of bipolar patients (CT 91.2%, TT 6.8%, and CC 2%) and controls (CT 52.7%, TT 26%, CC 21.3%) although their allelic distribution was similar. The serum valproic acid concentrations of the patients with CT, TT and CC genotypes were 72.92 +/- 20.55, 80.47 +/- 14.01 and 68.29 +/- 12.17 microg/ml, respectively, and there was no significant difference between the C3435T genotypes.
authors.affiliation: Department of Physiology, Pamukkale University, Denizli, Turkey.
authors.forename: Gunfer
authors.initials: G
authors.lastname: Turgut
authors.forename: Erhan
authors.initials: E
authors.lastname: Kurt
authors.forename: Cem
authors.initials: C
authors.lastname: Sengul
authors.forename: Gazi
authors.initials: G
authors.lastname: Alatas
authors.forename: Raziye
authors.initials: R
authors.lastname: Kursunluoglu
authors.forename: Timucin
authors.initials: T
authors.lastname: Oral
authors.forename: Sabahat
authors.initials: S
authors.lastname: Turgut
authors.forename: Hasan
authors.initials: H
authors.lastname: Herken
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics* / Q000378:metabolism; D000293:Adolescent; D000328:Adult; D000368:Aged; D001714:Bipolar Disorder / Q000188:drug therapy* / Q000235:genetics* / Q000378:metabolism; D003596:Cytosine / Q000378:metabolism; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D014635:Valproic Acid / Q000627:therapeutic use*
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D014635:Valproic Acid; D003596:Cytosine