title: Genetic and physical mapping in Brassica diploid species of a gene cluster defined in Arabidopsis thaliana.
abstract: We report the genetic and physical analysis by pulse field gel electrophoresis (PFGE) in three Brassica diploid genomes for a cluster of five genes characterized in a selected segment of 15 kb on chromosome 3 of Arabidopsis thaliana, encoding a Bradyrhizobium CycJ homologue (At1), a rat p67 translation factor homologue (At2), an Em-like (early methionine) protein (At3), chlorophyll synthase (At4) and a yeast Sac1 homologue (A5). The Arabidopsis gene array was found to be conserved on a single linkage group in each of the Brassica genomes. However, partial complexes were found to be duplicated in other chromosome segments on the same or other linkage groups. Some of the At genes, which could not be genetically mapped because of lack of polymorphism, were assigned to their respective linkage groups by physical mapping. The presence of multiple copies of the A. thaliana gene cluster in the three Brassica genomes further establishes their complex nature, which results from extensive duplication and chromosomal rearrangement. In general, genetic distances between the At genes agreed with values expected for the physical distances determined in Brassica.
authors.affiliation: Department of Vegetable Crops, University of California, Davis 95616, USA.
authors.forename: J
authors.initials: J
authors.lastname: Sadowski
authors.forename: P
authors.initials: P
authors.lastname: Gaubier
authors.forename: M
authors.initials: M
authors.lastname: Delseny
authors.forename: C F
authors.initials: CF
authors.lastname: Quiros
mesh_terms: D000626:Aminopeptidases; D000818:Animals; D017360:Arabidopsis / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics; D001937:Brassica / Q000235:genetics*; D019729:Carbon-Oxygen Ligases; D002874:Chromosome Mapping; D018744:DNA, Plant / Q000032:analysis; D004171:Diploidy; D016521:Electrophoresis, Gel, Pulsed-Field; D017343:Genes, Plant / Q000235:genetics*; D008040:Genetic Linkage; D006023:Glycoproteins / Q000235:genetics; D008025:Ligases / Q000235:genetics; D008565:Membrane Proteins / Q000235:genetics; D026901:Membrane Transport Proteins; D005810:Multigene Family / Q000235:genetics*; D012150:Polymorphism, Restriction Fragment Length; D011479:Protamines / Q000235:genetics; D051381:Rats
chemical_list: D001426:Bacterial Proteins; C093104:CycJ protein, Bacteria; D018744:DNA, Plant; D006023:Glycoproteins; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D011479:Protamines; C099636:Sac1 protein, Chlamydomonas reinhardtii; D000626:Aminopeptidases; C489895:Metap2 protein, rat; D008025:Ligases; D019729:Carbon-Oxygen Ligases; C026901:chlorophyll synthetase