title: Common and rare variants of DAOA in bipolar disorder.
abstract: The D-amino acid oxidase activator (DAOA, previously known as G72) gene, mapped on 13q33, has been reported to be genetically associated with bipolar disorder (BP) in several populations. The consistency of associated variants is unclear and rare variants in exons of the DAOA gene have not been investigated in psychiatric diseases. We employed a conditional linkage method-STatistical Explanation for Positional Cloning (STEPC) to evaluate whether any associated single nucleotide polymorphisms (SNPs) account for the evidence of linkage in a pedigree series that previously has been linked to marker D13S779 at 13q33. We also performed an association study in a sample of 376 Caucasian BP parent-proband trios by genotyping 38 common SNPs in the gene region. Besides, we resequenced coding regions and flanking intronic sequences of DAOA in 555 Caucasian unrelated BP patients and 564 mentally healthy controls, to identify putative functional rare variants that may contribute to disease. One SNP rs1935058 could "explain" the linkage signal in the family sample set (P = 0.055) using STEPC analysis. No significant allelic association was detected in an association study by genotyping 38 common SNPs in 376 Caucasian BP trios. Resequencing identified 53 SNPs, of which 46 were novel SNPs. There was no significant excess of rare variants in cases relative to controls. Our results suggest that DAOA does not have a major effect on BP susceptibility. However, DAOA may contribute to bipolar susceptibility in some specific families as evidenced by the STEPC analysis.
authors.affiliation: Human Genome Sequencing Center, Departments of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA.
authors.forename: Manjula
authors.initials: M
authors.lastname: Maheshwari
authors.forename: Jiajun
authors.initials: J
authors.lastname: Shi
authors.forename: Judith A
authors.initials: JA
authors.lastname: Badner
authors.forename: Andrew
authors.initials: A
authors.lastname: Skol
authors.forename: Virginia L
authors.initials: VL
authors.lastname: Willour
authors.forename: Donna M
authors.initials: DM
authors.lastname: Muzny
authors.forename: David A
authors.initials: DA
authors.lastname: Wheeler
authors.forename: Fowler R
authors.initials: FR
authors.lastname: Gerald
authors.forename: Sevilla
authors.initials: S
authors.lastname: Detera-Wadleigh
authors.forename: Francis J
authors.initials: FJ
authors.lastname: McMahon
authors.forename: James B
authors.initials: JB
authors.lastname: Potash
authors.forename: Elliot S
authors.initials: ES
authors.lastname: Gershon
authors.forename: Chunyu
authors.initials: C
authors.lastname: Liu
authors.forename: Richard A
authors.initials: RA
authors.lastname: Gibbs
mesh_terms: D001714:Bipolar Disorder / Q000201:enzymology* / Q000235:genetics*; D002352:Carrier Proteins / Q000235:genetics*; D003001:Cloning, Molecular; D005091:Exons / Q000235:genetics; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008297:Male; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D017422:Sequence Analysis, DNA
chemical_list: D002352:Carrier Proteins; C475071:DAOA protein, human; D047908:Intracellular Signaling Peptides and Proteins