Overlapping Region of p53/Wrap53 Transcripts: Mutational Analysis and Sequence Similarity with microRNA-4732-5p

Pouladi, Nasser; Kouhsari, Shideh Montasser; Feizi, Mohammadali Hosseinpour; Gavgani, Reyhaneh Ravanbakhsh; Azarfam, Parvin

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자료유형: 학술저널

저자정보: Pouladi, Nasser (Department of Cellular and Molecular Biology, School of Biology, College of Sciences, University of Tehran) Kouhsari, Shideh Montasser (Department of Cellular and Molecular Biology, School of Biology, College of Sciences, University of Tehran) Feizi, Mohammadali Hosseinpour (Department of Biology, Faculty of Natural Science, University of Tabriz) Gavgani, Reyhaneh Ravanbakhsh (Department of Biology, Faculty of Natural Science, University of Tabriz) Azarfam, Parvin (Department of Biology, Faculty of Natural Science, University of Tabriz)

저널정보: 아시아태평양암예방학회 Asian Pacific journal of cancer prevention : APJCP Asian Pacific journal of cancer prevention : APJCP 제14권 제6호

발행연도: 2013.1

수록면: 3,503 - 3,507 (5page)

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Background: Although the majority of investigations concerned with TP53 and its protein have focused on coding regions, recently a set of studies highlighted significant roles of regulatory elements located in p53 mRNA, especially 5'UTR. The wrap53${\alpha}$ transcript is one of those that acts as a natural antisense agent, forming RNA-RNA hybrids with p53 mRNA and protecting it from degradation. Materials and Methods: In this study, we focused on the mutation status of exon $1{\alpha}$ of the WRAP53 gene (according to exon 1 of p53) in 160 breast tumor tissue samples and conducted a bioinformatics search for probable miRNA binding site in the p53/wrap53 overlapping region. Mutations were detected, using single stranded conformation polymorphism (SSCP) and sequencing. We applied the miRBase database for prediction of miRNAs which target overlapping region of p53/wrap53 transcripts. Results: Our results showed all samples to have wild type alleles in exon 1 of TP53 gene. We could detect a novel and unreported intronic mutation (IVS1+56, G>C) outside overlapping regions of p53/wrap53 genes in breast cancer tissues and also predict the presence of a binding site for miR-4732-5p in the 5'UTR of Wrap53 mRNA. Conclusions: From our findings we propose designing further studies focused on overexpression of miRNA-4732-5p and introducing different mutations in the overlapping region of wrap53 and p53 genes in order to study their effects on p53 and its ${\Delta}N$ isoform (${\Delta}$40p53) expression. The results may provide new pieces in the p53 targeting puzzle for cancer therapy.

#p53 #wrap53 #miRNA-4732-5p #mutation #5' UTR #cancer

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