Abstract
We have characterized a 6.4 kb genomic fragment from Arabidopsis thaliana ecotype Columbia overlapping the 5′ end of the AKin10 gene which encodes a protein Ser/Thr kinase. Using, as probes, various restriction fragments located upstream of AKin10, two cDNA clones have been isolated from a cDNA library prepared from young shoot tissue. A comparison between the cDNA and the above genomic sequences allowed us to locate two novel genes, Atcysl and Athypl (for Arabidopsis thaliana cystathionine γ-synthase 1 and hypothetical protein 1). The coding sequences of both genes are interrupted by introns and the exons match the sequences of the corresponding cDNAs. Further analysis of the genomic fragment revealed the presence of an open reading frame (ORF) of 609 nucleotides situated between the two genes. Atcysl, Athypl, AKin10 and the ORF are very close to each other and organized in the same polarity; hence, the intergenic regions probably contain, within less than 0.5 kb, all the regulatory elements necessary to govern initiation and termination of transcription. The deduced protein sequence of Atcysl shows a high degree of similarity with the cystathionine γ-synthase from Escherichia coli. The putative product of the Athypl gene contains seven hydrophobic regions flanked by hydrophilic domains, reminiscent of membrane-spanning proteins. Southern blot hybridization experiments suggest the presence of one copy of Atcysl, Athypl and AKin10 per haploid genome, and Northern blot analysis demonstrates that the three genes are differentially expressed in roots, shoots and leaves.
References
Alderson A, Sabelli PA, Dickinson JR, Cole D, Richardson M, Kreis M, Shewry PR, Haldford NG (1991) Complementation of snf1, a mutation affecting global regulation of carbon metabolism in yeast, by a plant protein kinase cDNA. Proc Natl Acad Sci USA 88:8602–8605
Atanassova R, Chaubet N, Gigot C (1992) A 126 by fragment of a plant histone promoter confers preferential expression in meristems of transgenic Arabidopsis. Plant J 2:291–300
Baldwin, JM (1993) The probable arrangements of the helices in G protein-coupled receptors. EMBO J 1693–1703
Bianchi MW, Guivarc'h D, Thomas M, Woodgett JR, Kreis M (1994) Arabidopsis homologs of the shaggy and GSK-3 protein kinases: molecular cloning and functional expression in Escherichia coli. Mol Gen Genet 242:337–345
Bowman JL, Yanofsky MF, Meyerowitz EM (1988) Arabidopsis thaliana: a review. Oxf Surv Plant Mol Cell Biol 5:57–87
Celenza JL, Carlson M (1986) A yeast gene that is essential for release from glucose repression encodes a protein kinase. Science 233:1175–1180
Chaubet N, Clement B, Gigot C (1992) Genes encoding a histone H3.3-like variant in Arabidopsis contain intervening sequences. J Mol Biol 225:569–574
Dellaporta S, Wood LJ, Hicks JB (1983) A plant DNA minipreparation: “version II”. Plant Mol Biol Rep 1:19–21
Dohlman HG, Thorner J, Caron MG, and Lefkowitz RJ (1991) Model systems for the study of seven-transmembrane-segment receptors. Annu Rev Biochem 60:653–688.
Duchange N, Zakin MM, Ferrara P, Saint-Grois I, Park I, Tran SV, Py MC, Cohen GN (1983) Structure of the metJBLF cluster in Escherichia coli K12. J Biol Chem 258:14868–14871
Gibson S, Somerville C (1993) Isolating plant genes. Trends Biotechnol 11:306–312
Goodall JG, Filipowicz W (1990) The minimum functional length of pre-mRNA introns in monocots and dicots. Plant Mol Biol 14:727–733
Harpster MH, Taylor WC (1986) Differential expression of the maize PEPc gene family. J Biol Chem 261:6132–6136
Hawkins JD (1988) A survey on intron and exon lengths. Nucleic Acids Res 15:6643–6653
Jan LY, Jan YN (1992) Tracing the roots of ion channels. Cell 69:715–718
Jefferson RA, Burgess SM, Hirsh D (1986) β-Glucuronidase from Escherichia coli as a gene-fusion marker. Proc Natl Acad Sci USA 83:8447–8451
Joshi CP (1987) An inspection of the domain between putative TATA box and translation start site in 79 plant genes. Nucleic Acids Res 15:6643–6653
Kyte J, Doolittle RF (1982) A simple method for displaying the hydropathic character of a protein. J Mol Biol 157:105–132
Le Guen L, Thomas M, Bianchi M, Halford NG, Kreis M (1992) Structure and expression of a gene from Arabidopsis thaliana encoding a protein related to SNF1 protein kinase. Gene 120:249–254
Liboz T, Bardet C, Le Van Thai A, Axelos M, Lescure B (1989) The four members of the gene family encoding the Arabidopsis thaliana translation elongation factor EF-la are actively transcribed. Plant Mol Biol 14:107–110
Meyerowitz EM, Pruitt RE (1985) Arabidopsis thaliana and plant molecular genetics. Science 229:1214–1218
Sànger F, Nicklen S, Coulsen AR (1977) DNA sequencing with chain terminating inhibitors. Proc Natl Acad Sci USA 74:5463–5467
Sentenac H, Bonneaud N, Minet M, Lacroute F, Salmon JM, Gaymard F, Grignon C (1992) Cloning and expression in yeast of a plant potassium ion transport system. Science 256:663–665
Valvekens D, Van Montagu M, Libsebettens MV (1988) Agobacterium tumefaciens-mediated transformation of Arabidopsis thaliana root explants by using kanamycin selection. Proc Natl Acad Sci USA 85:5536–5540
Warmke J, Drysdale K, Ganetzky B (1991) A distinct potassium channel polypeptide encoded by the Drosophila locus. Science 1560–1562.
White O, Soderlund C, Shanmugan P, Fields C (1992) Information contents and dinucleotide compositions of plant intron sequences vary with evolutionary origin. Plant Mol Biol 19:1057–1064
Author information
Authors and Affiliations
Additional information
Communicated by A. Kondorosi
Rights and permissions
About this article
Cite this article
Le Guen, L., Thomas, M. & Kreis, M. Gene density and organization in a small region of the Arabidopsis thaliana genome. Molec. Gen. Genet. 245, 390–396 (1994). https://doi.org/10.1007/BF00290120
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00290120