title: Regulation of c-myc through intranuclear localization of its RNA subspecies.
abstract: We used fluorescence in situ hybridization (FISH) to detect c-myc RNA subspecies in human COLO 320DM tumor cells. Although the FISH procedure removed the majority of RNAs from the nucleolus, c-myc RNA continued to be detected in both the nucleoplasm and nucleolus. This finding suggests stable association between c-myc RNA and the nucleolus. Nucleolar accumulation of c-myc RNA appeared to be temporally regulated by cell-cycle progression. Hybridization with exon- and strand-specific RNA probes indicated that the non-protein coding exon 1 plays a novel role in determining the subnuclear localization of c-myc RNA. Antisense RNA targeting exon 2 localized only with nucleoplasmic foci, where it might interact with the sense strand. Thus, c-myc gene expression may be regulated by intranuclear localization of its RNA.
authors.affiliation: Graduate School of Biosphere Science, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima 739-8521, Japan. shimizu@hiroshima-u.ac.jp
authors.forename: Noriaki
authors.initials: N
authors.lastname: Shimizu
authors.forename: June-ko
authors.initials: JK
authors.lastname: Kawamoto
authors.forename: Koh-ichi
authors.initials: K
authors.lastname: Utani
mesh_terms: D002453:Cell Cycle; D045744:Cell Line, Tumor; D002467:Cell Nucleus / Q000235:genetics* / Q000378:metabolism; D005091:Exons / Q000235:genetics; D018628:Gene Dosage / Q000235:genetics*; D005786:Gene Expression Regulation; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D016271:Proto-Oncogene Proteins c-myc / Q000235:genetics* / Q000378:metabolism*; D012313:RNA / Q000235:genetics / Q000378:metabolism*; D034443:RNA Transport
chemical_list: D016271:Proto-Oncogene Proteins c-myc; D012313:RNA