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Genomic determinants of the efficiency of internal ribosomal entry sites of viral and cellular origin

Kazadi, Kayole
Loeuillet, Corinne
Deutsch, Samuel
Ciuffi, Angela
Muñoz, Miguel
Beckmann, Jacques S.
Moradpour, Darius
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Published in Nucleic Acids Research. 2008, vol. 36, no. 21, p. 6918-25
Abstract Variation in cellular gene expression levels has been shown to be inherited. Expression is controlled at transcriptional and post-transcriptional levels. Internal ribosome entry sites (IRES) are used by viruses to bypass inhibition of cap-dependent translation, and by eukaryotic cells to control translation under conditions when protein synthesis is inhibited. We aimed at identifying genomic determinants of variability in IRES-mediated translation of viral [Encephalomyocarditis virus (EMCV)] and cellular IRES [X-linked inhibitor-of-apoptosis (XIAP) and c-myc]. Bicistronic lentiviral constructs expressing two fluorescent reporters were used to transduce laboratory and B lymphoblastoid cell lines [15 CEPH pedigrees (n = 205) and 50 unrelated individuals]. IRES efficiency varied according to cell type and among individuals. Control of IRES activity has a significant genetic component (h(2) of 0.47 and 0.36 for EMCV and XIAP, respectively). Quantitative linkage analysis identified a suggestive locus (LOD 2.35) on chromosome 18q21.2, and genome-wide association analysis revealed of a cluster of SNPs on chromosome 3, intronic to the FHIT gene, marginally associated (P = 5.9E-7) with XIAP IRES function. This study illustrates the in vitro generation of intermediate phenotypes by using cell lines for the evaluation of genetic determinants of control of elements such as IRES.
Keywords Cell LineEncephalomyocarditis virusGenome-Wide Association StudyHumansLinkage (Genetics)Protein BiosynthesisProto-Oncogene Proteins c-mycQuantitative Trait LociRNAViralX-Linked Inhibitor of Apoptosis Protein
PMID: 18978018
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Research group Pathologie Moléculaire de la Trisomie 21 et le Génome Humain (248)
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KAZADI, Kayole et al. Genomic determinants of the efficiency of internal ribosomal entry sites of viral and cellular origin. In: Nucleic Acids Research, 2008, vol. 36, n° 21, p. 6918-25. doi: 10.1093/nar/gkn812 https://archive-ouverte.unige.ch/unige:643

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Deposited on : 2009-01-19

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