title: Melatonin receptor 1B gene associated with hyperglycemia in bipolar disorder.
abstract: Bipolar patients are at a higher risk of developing metabolic disorders. Cardiovascular morbidity and mortality is twice the rate reported in the population. Antipsychotic medication increases the risk of metabolic abnormalities. However, bipolar disorder and schizophrenia have a similarly increased mortality from cardiovascular causes of death, although bipolar patients medicate with antipsychotic drugs to a much smaller extent than schizophrenic patients. Bipolar disorder and schizophrenia share substantial genetic risk components; thus, increased metabolic abnormalities is hypothesized to be an effect of specific sets of metabolic risk genes, which might overlap with the metabolic risk genes in schizophrenia. This study reports that a functional genetic variant of MTNR1B, previously implicated in the impairment of glucose-stimulated insulin release also in schizophrenia, was associated with elevated fasting glucose levels in bipolar patients and controls. This finding suggests that the MTNR1B-dependent vulnerability for elevated fasting plasma glucose levels is shared between bipolar disorder and schizophrenia.
authors.affiliation: aNeurogenetics Unit, Department of Molecular Medicine and Surgery bDepartment of Clinical Neuroscience cEndocrine and Diabetes Unit, Department of Molecular Medicine and Surgery dCardiovascular Medicine Unit, Department of Medicine eDepartment of Neurobiology, Care Sciences and Society, Centre for Family Medicine fCentre for Psychiatric Research and Education, Karolinska Institutet gCenter for Molecular Medicine, Karolinska University Hospital Solna hChild and Adolescent Psychiatry Research Center, Stockholm iDepartment of Clinical Sciences, Lund University, Lund, Sweden.
authors.forename: Dzana S
authors.initials: DS
authors.lastname: Hukic
authors.forename: Catharina
authors.initials: C
authors.lastname: Lavebratt
authors.forename: Louise
authors.initials: L
authors.lastname: Frisén
authors.forename: Lena
authors.initials: L
authors.lastname: Backlund
authors.forename: Agneta
authors.initials: A
authors.lastname: Hilding
authors.forename: Harvest F
authors.initials: HF
authors.lastname: Gu
authors.forename: Claes-Göran
authors.initials: CG
authors.lastname: Östenson
authors.forename: David
authors.initials: D
authors.lastname: Erlinge
authors.forename: Ewa
authors.initials: E
authors.lastname: Ehrenborg
authors.forename: Martin
authors.initials: M
authors.lastname: Schalling
authors.forename: Urban
authors.initials: U
authors.lastname: Ösby
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001714:Bipolar Disorder / Q000150:complications*; D005260:Female; D006801:Humans; D006943:Hyperglycemia / Q000150:complications / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D044123:Receptor, Melatonin, MT2 / Q000235:genetics*; D055815:Young Adult
chemical_list: C573871:MTNR1B protein, human; D044123:Receptor, Melatonin, MT2