title: Identification of positive and negative regulatory regions controlling expression of the Xenopus laevis betaTrCP gene.
abstract: betaTrCP mediates the ubiquitination and subsequent degradation of several key molecules thereby playing a relevant role in different cellular processes during development and in the adult. In Xenopus embryo, betaTrCP acts as a negative regulator of Wnt signaling by interacting with beta-catenin. In this paper, we report results of the study on expression and regulation of the Xenopus betaTrCP gene. We found that xbetaTrCP is expressed in Xenopus oocytes as three transcripts, which very likely correspond to the previously identified localized mRNAs, and four isoforms. The xbetaTrCP promoter functional and structural analysis showed the presence of elements target of positive transcriptional control. Among them, we have identified a beta-catenin/Tcf signaling responsive region and a 45-bp element containing a sequence motif conforming to the SRF binding site, closer to the transcription initiation sites. There are also elements of transcriptional negative control.
authors.affiliation: Consiglio Nazionale delle Ricerche, Istituto di Biologia e Patologia Molecolari, Sezione Acidi Nucleici, Dipartimento di Genetica e Biologia Molecolare ' Charles Darwin', Università 'La Sapienza', P.le Aldo Moro 5, 00185-Rome, Italy.
authors.forename: Monica
authors.initials: M
authors.lastname: Ballarino
authors.forename: Alberto
authors.initials: A
authors.lastname: Fruscalzo
authors.forename: Marcella
authors.initials: M
authors.lastname: Marchioni
authors.forename: Francesca
authors.initials: F
authors.lastname: Carnevali
mesh_terms: D024506:5' Flanking Region / Q000235:genetics; D000818:Animals; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D002460:Cell Line; D045744:Cell Line, Tumor; D015342:DNA Probes / Q000235:genetics / Q000378:metabolism; D024202:Electrophoretic Mobility Shift Assay; D005260:Female; D005786:Gene Expression Regulation; D006801:Humans; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D009865:Oocytes / Q000378:metabolism; D011401:Promoter Regions, Genetic / Q000235:genetics; D011485:Protein Binding; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012045:Regulatory Sequences, Nucleic Acid / Q000235:genetics*; D020218:Response Elements / Q000235:genetics; D024363:Transcription Initiation Site; D029867:Xenopus Proteins / Q000235:genetics*; D014982:Xenopus laevis / Q000235:genetics*; D044844:beta-Transducin Repeat-Containing Proteins / Q000235:genetics*
chemical_list: C471646:BTRC protein, Xenopus; D015342:DNA Probes; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; D029867:Xenopus Proteins; D044844:beta-Transducin Repeat-Containing Proteins; D008156:Luciferases