CRY2 genetic variants associate with dysthymia.
People with mood disorders often have disruptions in their circadian rhythms. Recent molecular genetics has linked circadian clock genes to mood disorders. Our objective was to study two core circadian clock genes, CRY1 and CRY2 as well as TTC1 that interacts with CRY2, in relation to depressive and anxiety disorders. Of these three genes, 48 single-nucleotide polymorphisms (SNPs) whose selection was based on the linkage disequilibrium and potential functionality were genotyped in 5910 individuals from a nationwide population-based sample. The diagnoses of major depressive disorder, dysthymia and anxiety disorders were assessed with a structured interview (M-CIDI). In addition, the participants filled in self-report questionnaires on depressive and anxiety symptoms. Logistic and linear regression models were used to analyze the associations of the SNPs with the phenotypes. Four CRY2 genetic variants (rs10838524, rs7121611, rs7945565, rs1401419) associated significantly with dysthymia (false discovery rate q<0.05). This finding together with earlier CRY2 associations with winter depression and with bipolar type 1 disorder supports the view that CRY2 gene has a role in mood disorders.
National Institute for Health and Welfare-THL, Department of Mental Health and Substance Abuse Services, Helsinki, Finland. leena.kovanen@thl.fi
Leena
L
Kovanen
Mari
M
Kaunisto
Kati
K
Donner
Sirkku T
ST
Saarikoski
Timo
T
Partonen
D033942:Adaptor Proteins, Vesicular Transport / Q000235:genetics; D000328:Adult; D001008:Anxiety Disorders / Q000235:genetics*; D057906:Circadian Clocks; D056931:Cryptochromes / Q000235:genetics*; D003866:Depressive Disorder / Q000235:genetics*; D005260:Female; D020962:Heterotrimeric GTP-Binding Proteins / Q000235:genetics; D006801:Humans; D008297:Male; D020641:Polymorphism, Single Nucleotide
D033942:Adaptor Proteins, Vesicular Transport; C538963:CRY1 protein, human; C538966:CRY2 protein, human; D056931:Cryptochromes; C475144:TTC1 protein, human; D020962:Heterotrimeric GTP-Binding Proteins