Steen VM

References (2)

Title : Mutations in ABHD12 cause the neurodegenerative disease PHARC: An inborn error of endocannabinoid metabolism - Fiskerstrand_2010_Am.J.Hum.Genet_87_410
Author(s) : Fiskerstrand T , H'Mida-Ben Brahim D , Johansson S , M'Zahem A , Haukanes BI , Drouot N , Zimmermann J , Cole AJ , Vedeler C , Bredrup C , Assoum M , Tazir M , Klockgether T , Hamri A , Steen VM , Boman H , Bindoff LA , Koenig M , Knappskog PM
Ref : American Journal of Human Genetics , 87 :410 , 2010
Abstract : Polyneuropathy, hearing loss, ataxia, retinitis pigmentosa, and cataract (PHARC) is a neurodegenerative disease marked by early-onset cataract and hearing loss, retinitis pigmentosa, and involvement of both the central and peripheral nervous systems, including demyelinating sensorimotor polyneuropathy and cerebellar ataxia. Previously, we mapped this Refsum-like disorder to a 16 Mb region on chromosome 20. Here we report that mutations in the ABHD12 gene cause PHARC disease and we describe the clinical manifestations in a total of 19 patients from four different countries. The ABHD12 enzyme was recently shown to hydrolyze 2-arachidonoyl glycerol (2-AG), the main endocannabinoid lipid transmitter that acts on cannabinoid receptors CB1 and CB2. Our data therefore represent an example of an inherited disorder related to endocannabinoid metabolism. The endocannabinoid system is involved in a wide range of physiological processes including neurotransmission, mood, appetite, pain appreciation, addiction behavior, and inflammation, and several potential drugs targeting these pathways are in development for clinical applications. Our findings show that ABHD12 performs essential functions in both the central and peripheral nervous systems and the eye. Any future drug-mediated interference with this enzyme should consider the potential risk of long-term adverse effects.
ESTHER : Fiskerstrand_2010_Am.J.Hum.Genet_87_410
PubMedSearch : Fiskerstrand_2010_Am.J.Hum.Genet_87_410
PubMedID: 20797687
Gene_locus related to this paper: human-ABHD12

Title : Association analysis of schizophrenia on 18 genes involved in neuronal migration: MDGA1 as a new susceptibility gene - Kahler_2008_Am.J.Med.Genet.B.Neuropsychiatr.Genet_147B_1089
Author(s) : Kahler AK , Djurovic S , Kulle B , Jonsson EG , Agartz I , Hall H , Opjordsmoen S , Jakobsen KD , Hansen T , Melle I , Werge T , Steen VM , Andreassen OA
Ref : American Journal of Medicine Genet B Neuropsychiatr Genet , 147B :1089 , 2008
Abstract : Several lines of evidence support the theory of schizophrenia (SZ) being a neurodevelopmental disorder. The structural, cytoarchitectural and functional brain abnormalities reported in patients with SZ, might be due to aberrant neuronal migration, since the final position of neurons affects neuronal function, morphology, and formation of synaptic connections. We have investigated the putative association between SZ and gene variants engaged in the neuronal migration process, by performing an association study on 839 cases and 1,473 controls of Scandinavian origin. Using a gene-wide approach, tagSNPs in 18 candidate genes have been genotyped, with gene products involved in the neuron-to-glial cell adhesion, interactions with the DISC1 protein and/or rearrangements of the cytoskeleton. Of the 289 markers tested, 19 markers located in genes MDGA1, RELN, ITGA3, DLX1, SPARCL1, and ASTN1, attained nominal significant P-values (P < 0.05) in either a genotypic or allelic association test. All of these genes, except transcription factor DLX1, are involved in the adhesion between neurons and radial glial cells. Eight markers obtained nominal significance in both tests, and were located in intronic or 3'UTR regions of adhesion molecule MDGA1 and previously reported SZ candidate RELN. The most significant result was attained for MDGA1 SNP rs9462341 (unadjusted association results: genotypic P = 0.00095; allelic P = 0.010). Several haplotypes within MDGA1, RELN, ITGA3, and ENAH were nominally significant. Further studies in independent samples are needed, including upcoming genome wide association study results, but our data suggest that MDGA1 is a new SZ susceptibility gene, and that altered neuronal migration is involved in SZ pathology.
ESTHER : Kahler_2008_Am.J.Med.Genet.B.Neuropsychiatr.Genet_147B_1089
PubMedSearch : Kahler_2008_Am.J.Med.Genet.B.Neuropsychiatr.Genet_147B_1089
PubMedID: 18384059