title: Structure, organization and putative function of the genes identified within a 23.9-kb fragment from Arabidopsis thaliana chromosome IV.
abstract: In the framework of the complete genome sequencing programme of the crucifer Arabidopsis thaliana, a 23.9-kb fragment from the long arm of chromosome IV has been analysed. This paper presents a methodological approach, integrating computerized predictions, database screening, the sequencing of cognate cDNAs and a PCR-based detection of expression that allows the accumulation of an important amount of information from an anonymous sequence. This work revealed the organization of novel genes and the vestige of a copia-like retrotransposon. The gene AtRH1 encodes the first member of a new subfamily of the plant DEAD box RNA helicases. A recurrent and complete search of dbEST has been used to evaluate the number of different RNA helicases expressed in A. thaliana. On the 18 discriminated members of the family, only a small number seems to be expressed at a relatively high level. The putative gene AtTS1 encodes a novel terpene synthase in A. thaliana, and the genes G14587-5 and G14587-6 encode unknown proteins. This study illustrates most of the situations that could be encountered during the analysis of an anonymous sequence from A. thaliana.
authors.affiliation: Laboratoire de Biologie du Développement des Plantes, Institut de Biotechnologie des Plantes, ERS/CNRS 569, Université de Paris-Sud, Orsay, France.
authors.forename: S
authors.initials: S
authors.lastname: Aubourg
authors.forename: A
authors.initials: A
authors.lastname: Takvorian
authors.forename: A
authors.initials: A
authors.lastname: Chéron
authors.forename: M
authors.initials: M
authors.lastname: Kreis
authors.forename: A
authors.initials: A
authors.lastname: Lecharny
mesh_terms: D019883:Alkyl and Aryl Transferases / Q000235:genetics*; D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics*; D002874:Chromosome Mapping; D018076:DNA, Complementary / Q000235:genetics; D015870:Gene Expression; D017343:Genes, Plant / Q000235:genetics*; D008969:Molecular Sequence Data; D020365:RNA Helicases; D012316:RNA Nucleotidyltransferases / Q000235:genetics*; D018626:Retroelements / Q000235:genetics; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid
chemical_list: D018076:DNA, Complementary; D018626:Retroelements; D019883:Alkyl and Aryl Transferases; C108877:terpene synthase; D012316:RNA Nucleotidyltransferases; D020365:RNA Helicases