title: Isolation and characterization of the gene encoding EF-1 alpha O, an elongation factor 1-alpha expressed during early development of Xenopus laevis.
abstract: In Xenopus laevis, the gene encoding the elongation factor 1-alpha variant EF-1 alpha O, where O stands for oocyte, is expressed in oocytes and early embryos. A genomic library from X. laevis was screened with a cDNA probe coding for EF-1 alpha O. Two recombinant phages were isolated, one of which carries an entire EF-1 alpha O gene. This clone was characterized by restriction enzyme mapping and sequencing. Comparison of cDNA and genomic sequences revealed that EF-1 alpha O consists of seven exons spanning about 6.5 kb. The structure of the gene is very homologous to the human EF-1 alpha gene, as all locations of the splice junctions are conserved between the two genes. The sequence immediately upstream from the transcription start point (tsp) contains a CCAAT box, but does not contain either a TATA box or a Sp1-binding site. Interestingly, this sequence has a sequence homologous to the negative regulatory element from the TFIIIA promoter. A region located about 400 bp upstream from the tsp contains an additional number of possible regulatory sequence elements. The first intron contains G + C-rich elements which exist both isolated and as part of longer inverted repeats. Furthermore, one octamer and four Sp1-binding sites are found in this intron.
authors.affiliation: Division of Biostructural Chemistry, Aarhus University, Denmark.
authors.forename: J
authors.initials: J
authors.lastname: Frydenberg
authors.forename: K
authors.initials: K
authors.lastname: Poulsen
authors.forename: A K
authors.initials: AK
authors.lastname: Petersen
authors.forename: A
authors.initials: A
authors.lastname: Lund
authors.forename: O F
authors.initials: OF
authors.lastname: Olesen
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D004742:Enhancer Elements, Genetic / Q000235:genetics; D005091:Exons / Q000235:genetics; D015870:Gene Expression / Q000235:genetics; D007438:Introns / Q000235:genetics; D008969:Molecular Sequence Data; D009865:Oocytes / Q000378:metabolism; D020648:Peptide Elongation Factor 1; D010445:Peptide Elongation Factors / Q000235:genetics*; D011401:Promoter Regions, Genetic / Q000235:genetics*; D012091:Repetitive Sequences, Nucleic Acid; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D035582:Transcription Factor TFIIIA; D014157:Transcription Factors / Q000235:genetics; D014158:Transcription, Genetic / Q000235:genetics; D014982:Xenopus laevis / Q000196:embryology / Q000235:genetics* / Q000254:growth & development
chemical_list: D020648:Peptide Elongation Factor 1; D010445:Peptide Elongation Factors; D035582:Transcription Factor TFIIIA; D014157:Transcription Factors