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RNA-binding protein QKI regulates Glial fibrillary acidic protein expression in human astrocytes.
MedLine Citation:
PMID:  23321059     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Linkage, association and expression studies previously pointed to the human QKI, KH domain containing, RNA-binding (QKI) as a candidate gene for schizophrenia. Functional studies of the mouse ortholog Qk focused mainly on its role in oligodendrocyte development and myelination, while its function in astroglia remained unexplored. Here we show that QKI is highly expressed in human primary astrocytes and that its splice forms encode proteins targeting different sub-cellular localizations. Uncovering the role of QKI in astrocytes is of interest in light of growing evidence implicating astrocyte dysfunction in the pathogenesis of several disorders of the central nervous system. We selectively silenced QKI splice variants in human primary astrocytes and used RNA sequencing to identify differential expression and splice variant composition at the genome-wide level. We found that mRNA expression of Glial fibrillary acidic protein (GFAP), encoding a major component of astrocyte intermediate filaments, was down-regulated after QKI7 splice variant silencing. Moreover, we identified a potential QKI binding site within the 3'untranslated region of human GFAP. This sequence was not conserved between mice and humans, raising the possibility that GFAP is a target for QKI in humans but not rodents. Haloperidol treatment of primary astrocytes resulted in coordinated increases in QKI7 and GFAP expression. Taken together, our results provide the first link between QKI and GFAP, two genes with alterations previously observed independently in schizophrenic patients. Our findings for QKI, together with its well-known role in myelination, suggest that QKI is a hub regulator of glia function in humans.
Authors:
Katarzyna J Radomska; Jonatan Halvardson; Björn Reinius; Eva Lindholm Carlström; Lina Emilsson; Lars Feuk; Elena Jazin
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-15
Journal Detail:
Title:  Human molecular genetics     Volume:  -     ISSN:  1460-2083     ISO Abbreviation:  Hum. Mol. Genet.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9208958     Medline TA:  Hum Mol Genet     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Evolution and Development, Evolutionary Biology Centre, Uppsala University, 75235 Uppsala, Sweden.
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