Identification of Novel Alternatively Spliced Transcripts of RBMS3 in Skeletal Muscle with Correlations to Insulin Action in vivo

  • Lee, Yong-Ho (Department of Biomedical Science, Catholic University of Daegu) ;
  • Tokraks, Stephen (Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health) ;
  • Nair, Saraswathy (Center for Biomedical Studies, University of Texas at Brownsville) ;
  • Bogardus, Clifton (Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health) ;
  • Permana, Paska A. (Phoenix Veterans Affairs Health Care System)
  • Published : 2009.12.31

Abstract

Whole-body insulin resistance results largely from impaired insulin-stimulated glucose disposal in skeletal muscle. Our previous studies using differential display and quantitative real-time RT-PCR have shown that a novel cDNA band (DD23) had a higher level of expression in insulin resistant skeletal muscle and it was correlated with whole-body insulin action, independent of age, sex, and percent body fat. In this study, we cloned and characterized DD23. The DD23 sequence is part of the 3'UTR region of the RNA binding motif, single stranded interacting protein (RBMS3). We have cloned the full length cDNA for RBMS3 and identified two splice variants. These variants named DD23-L and DD23-S have 15 and 14 exons respectively and differ from RBMS3 in the 3'UTR significantly. Northern blot analyses showed that an ~8.8 kb mRNA transcript of DD23 was predominantly expressed in skeletal muscle and to a lesser extent in placenta, but not in heart, brain, lung, liver, or kidney, unlike RBMS3. Elevated expression levels of these novel alternatively spliced variants of RBMS3 in skeletal muscle may play a role in whole body insulin resistance.

Keywords

References

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