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Sökning: WFRF:(Melle I.)

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  • Föregående 123[4]567...8Nästa
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  • Haukvik, U. K., et al. (författare)
  • Pre- and perinatal hypoxia associated with hippocampus/amygdala volume in bipolar disorder
  • 2014
  • Ingår i: Psychological Medicine. - Cambridge University Press. - 1469-8978. ; 44:5, s. 975-985
  • Tidskriftsartikel (refereegranskat)abstract
    • Background Pre- and perinatal adversities may increase the risk for schizophrenia and bipolar disorder. Hypoxia-related obstetric complications (OCs) are associated with brain anatomical abnormalities in schizophrenia, but their association with brain anatomy variation in bipolar disorder is unknown. Method Magnetic resonance imaging brain scans, clinical examinations and data from the Medical Birth Registry of Norway were obtained for 219 adults, including 79 patients with a DSM-IV diagnosis of bipolar disorder (age 29.4 years, s.d.=11.8 years, 39% male) and 140 healthy controls (age 30.8 years, s.d.=12.0 years, 53% male). Severe hypoxia-related OCs throughout pregnancy/birth and perinatal asphyxia were each studied in relation to a priori selected brain volumes (hippocampus, lateral ventricles and amygdala, obtained with FreeSurfer), using linear regression models covarying for age, sex, medication use and intracranial volume. Multiple comparison adjustment was applied. Results Perinatal asphyxia was associated with smaller left amygdala volume (t=-2.59, p=0.012) in bipolar disorder patients, but not in healthy controls. Patients with psychotic bipolar disorder showed distinct associations between perinatal asphyxia and smaller left amygdala volume (t=-2.69, p=0.010), whereas patients with non-psychotic bipolar disorder showed smaller right hippocampal volumes related to both perinatal asphyxia (t=-2.60, p=0.015) and severe OCs (t=-3.25, p=0.003). No associations between asphyxia or severe OCs and the lateral ventricles were found. Conclusions Pre- and perinatal hypoxia-related OCs are related to brain morphometry in bipolar disorder in adulthood, with specific patterns in patients with psychotic versus non-psychotic illness.
35.
  • Hibar, Derrek P., et al. (författare)
  • Common genetic variants influence human subcortical brain structures
  • 2015
  • Ingår i: Nature. - 0028-0836. ; 520:7546, s. 224-U216
  • Tidskriftsartikel (refereegranskat)abstract
    • The highly complex structure of the human brain is strongly shaped by genetic influences(1). Subcortical brain regions form circuits with cortical areas to coordinate movement(2), learning, memory(3) and motivation(4), and altered circuits can lead to abnormal behaviour and disease(5). To investigate how common genetic variants affect the structure of these brain regions, here we conduct genome-wide association studies of the volumes of seven subcortical regions and the intracranial volume derived from magnetic resonance images of 30,717 individuals from 50 cohorts. We identify five novel genetic variants influencing the volumes of the putamen and caudate nucleus. We also find stronger evidence for three loci with previously established influences on hippocampal volume(5) and intracranial volume(6). These variants show specific volumetric effects on brain structures rather than global effects across structures. The strongest effects were found for the putamen, where a novel intergenic locus with replicable influence on volume (rs945270; P = 1.08 X 10(-33); 0.52% variance explained) showed evidence of altering the expression of the KTN1 gene in both brain and blood tissue. Variants influencing putamen volume clustered near developmental genes that regulate apoptosis, axon guidance and vesicle transport. Identification of these genetic variants provides insight into the causes of variability in human brain development, and may help to determine mechanisms of neuropsychiatric dysfunction.
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