J E Severinsen

Aarhus University, Aars, Region North Jutland, Denmark

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Publications (4)23.69 Total impact

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    ABSTRACT: The MCHR1 gene encoding the melanin-concentrating hormone receptor 1 is located on chromosome 22q13.2 and has previously been associated with schizophrenia in a study of cases and controls from the Faroe Islands and Scotland. Herein we report an association between variations in the MCHR1 gene and schizophrenia, based on analyses of a larger sample and an increased number of single nucleotide polymorphisms (SNPs) than used in the previous study. Eighteen SNPs in the MCHR1 gene region were genotyped in a Caucasian case-control sample from Denmark consisting of 390 individuals with schizophrenia and 814 control individuals. Sex-specific analysis and analysis of association with antipsychotic treatment were performed. Five SNPs in the proximal region of MCHR1 were significantly associated with schizophrenia. The associations seemed to be sex specific, predominantly seen in men where one SNP (rs133073) remained significant (P=0.003) after correction for multiple testing. When combining the P values in the proximal region of MCHR1, the region-wise P value was low (P=0.009) supporting that variations in this part of the gene is associated with schizophrenia. Furthermore, the association was stronger in patients responding to conventional and atypical antipsychotic medication except clozapine. Our results suggest that MCHR1 may influence schizophrenia susceptibility, in particular among men and patients responding to conventional (nonclozapine) treatment.
    Psychiatric genetics 11/2011; 22(2):62-9. · 2.33 Impact Factor
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    ABSTRACT: A recent study published by our group implicated the bromodomain containing protein 1 (BRD1) gene located at chromosome 22q13.33 with schizophrenia (SZ) and bipolar affective disorder (BPD) susceptibility and provided evidence suggesting a possible role for BRD1 in neurodevelopment. The present study reports an association analysis of BRD1 and the neighboring gene ZBED4 using a Caucasian case-control sample from Denmark and England (UK/DK sample: 490 patients with BPD, 527 patients with SZ, and 601 control individuals), and genotypes obtained from a BPD genome wide association (GWA) study of an overlapping English sample comprising 506 patients with BPD and 510 control individuals (UCL sample). In the UK/DK sample we genotyped 11 SNPs in the BRD1 region, of which six showed association with SZ (minimal single marker P-values of 0.0014), including two SNPs that previously showed association in a Scottish population [Severinsen et al. (2006); Mol Psychiatry 11(12): 1126-1138]. Haplotype analysis revealed specific risk as well as protective haplotypes with a minimal P-value of 0.0027. None of the 11 SNPs showed association with BPD. However, analyzing seven BRD1 SNPs obtained from the BPD GWA study, positive associations with BPD was observed with all markers (minimal P-value of 0.0014). The associations reported add further support for the implication of BRD1 with SZ and BPD susceptibility.
    American Journal of Medical Genetics Part B Neuropsychiatric Genetics 09/2009; 153B(2):582-91. · 3.23 Impact Factor
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    ABSTRACT: Linkage studies suggest that chromosome 22q12-13 may contain one or more shared susceptibility genes for schizophrenia (SZ) and bipolar affective disorder (BPD). In a Faeroese sample, we previously reported association between microsatellite markers located at 22q13.31-qtel and both disorders. The present study reports an association analysis across five genes (including 14 single nucleotide and two microsatellite polymorphisms) in this interval using a case-control sample of 162 BPD, 103 SZ patients and 200 controls. The bromodomain-containing 1 gene (BRD1), which encodes a putative regulator of transcription showed association with both disorders with minimal P-values of 0.0046 and 0.00001 for single marker and overall haplotype analysis, respectively. A specific BRD1 2-marker 'risk' haplotype showed a frequency of approximately 10% in the combined case group versus approximately 1% in controls (P-value 2.8 x 10(-7)). Expression analysis of BRD1 mRNA revealed widespread expression in mammalian brain tissue, which was substantiated by immunohistochemical detection of BRD1 protein in the nucleus, perikaryal cytosol and proximal dendrites of the neurons in the adult rat, rabbit and human CNS. Quantitative mRNA analysis in developing fetal pig brain revealed spatiotemporal differences with high expression at early embryonic stages, with intense nuclear and cytosolar immunohistochemical staining of the neuroepithelial layer and early neuroblasts, whilst more mature neurons at later embryonic stages had less nuclear staining. The results implicate BRD1 with SZ and BPD susceptibility and provide evidence that suggests a role for BRD1 in neurodevelopment.
    Molecular Psychiatry 01/2007; 11(12):1126-38. · 14.90 Impact Factor
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    ABSTRACT: Linkage analyses suggest that chromosome 22q12-13 may harbor a shared susceptibility locus for bipolar affective disorder (BPD) and schizophrenia (SZ). In a study of a sample from the Faeroe Islands we have previously reported association between both disorders and microsatellite markers in a 3.6 cM segment on 22q13. The present study investigated three candidate genes located in this segment: GPR24, ADSL, and ST13. Nine SNPs located in these genes and one microsatellite marker (D22S279) were applied in an association analysis of two samples: an extension of the previously analyzed Faeroese sample comprising 28 distantly related cases (17 BPD, 11 SZ subjects) and 44 controls, and a Scottish sample including 162 patients with BPD, 103 with SZ, and 200 controls. In both samples significant associations were observed in both disorders with predominantly GPR24 SNPs and haplotypes. In the Faeroese sample overall P-values of 0.0009, 0.0054, and 0.0023 were found for haplotypes in BPD, SZ, and combined cases, respectively, and in the Scottish sample overall P-values of 0.0003, 0.0005, and 0.016 were observed for similar groupings. Specific haplotypes showed associations with lowest P-values of 7 x 10(-5) and 0.0006 in the combined group of cases from the Faeroe Islands and Scotland, respectively. The G protein-coupled receptor 24 encoded by GPR24 binds melanin-concentrating hormone (MCH) and has been implicated with feeding behavior, energy metabolism, and regulation of stress and mood. To our knowledge this is the first study reporting association between GPR24 and BPD and SZ, suggesting that GPR24 variants may confer susceptibility to both disorders.
    American Journal of Medical Genetics Part B Neuropsychiatric Genetics 08/2006; 141B(5):524-33. · 3.23 Impact Factor