Skipping of an alternative intron in the srsf1 3' untranslated region increases transcript stability

DOI IR Web Site 17 References
  • Akaike Yoko
    Department of Stress Science, Institute of Health Biosciences, the University of Tokushima Graduate School Student Lab, the University of Tokushima Faculty of Medicine
  • Kurokawa Ken
    Department of Stress Science, Institute of Health Biosciences, the University of Tokushima Graduate School Student Lab, the University of Tokushima Faculty of Medicine
  • Kajita Keisuke
    Department of Stress Science, Institute of Health Biosciences, the University of Tokushima Graduate School Student Lab, the University of Tokushima Faculty of Medicine
  • Kuwano Yuki
    Department of Stress Science, Institute of Health Biosciences, the University of Tokushima Graduate School
  • Masuda Kiyoshi
    Department of Stress Science, Institute of Health Biosciences, the University of Tokushima Graduate School
  • Nishida Kensei
    Department of Stress Science, Institute of Health Biosciences, the University of Tokushima Graduate School
  • Wan Kang Seung
    Institute of Complementary and Integrative Medicine, Medical Research Center, Seoul National University
  • Tanahashi Toshihito
    Department of Stress Science, Institute of Health Biosciences, the University of Tokushima Graduate School
  • Rokutan Kazuhito
    Department of Stress Science, Institute of Health Biosciences, the University of Tokushima Graduate School

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Abstract

The srsf1 gene encodes serine/arginine-rich splicing factor 1 (SRSF1) that participates in both constitutive and alternative splicing reactions. This gene possesses two ultraconserved elements in the 3’ untranslated region (UTR). Skipping of an alternative intron between the two elements has no effect on the protein-coding sequence, but it generates a premature stop codon (PTC)-containing mRNA isoform, whose degradation is considered to depend on nonsense-mediated mRNA decay (NMD). However, several cell lines (HCT116, RKO, HeLa, and WI38 cells) constitutively expressed significant amounts of the srsf1 PTC variant. HCT116 cells expressed the PTC variant nearly equivalent to the major isoform that includes the alternative intron in the 3’ UTR. Inhibition of NMD by silencing a key effecter UPF1 or by treatment with cycloheximide failed to increase amounts of the PTC variant in HCT116 cells, and the PTC variant was rather more stable than the major isoform in the presence of actinomycin D. Our results suggest that the original stop codon may escape from the NMD surveillance even in skipping of the alternative intron. The srsf1 gene may produce an alternative splice variant having truncated 3’ UTR to relief the microRNA- and/or RNA-binding protein-mediated control of translation or degradation. J. Med. Invest. 58: 180-187, August, 2011

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