title: Linkage mapping of 1454 new maize candidate gene Loci.
abstract: Bioinformatic analyses of maize EST sequences have highlighted large numbers of candidate genes putatively involved in agriculturally important traits. To contribute to ongoing efforts toward mapping of these genes, we used two populations of intermated recombinant inbred lines (IRILs), which allow a higher map resolution than nonintermated RILs. The first panel (IBM), derived from B73 x Mo17, is publicly available from the Maize Genetics Cooperation Stock Center. The second panel (LHRF) was developed from F2 x F252 to map loci monomorphic on IBM. We built framework maps of 237 loci from the IBM panel and 271 loci from the LHRF panel. Both maps were used to place 1454 loci (1056 on map IBM_Gnp2004 and 398 on map LHRF_Gnp2004) that corresponded to 954 cDNA probes previously unmapped. RFLP was mostly used, but PCR-based methods were also performed for some cDNAs to map SNPs. Unlike in usual IRIL-based maps published so far, corrected meiotic centimorgan distances were calculated, taking into account the number of intermating generations undergone by the IRILs. The corrected sizes of our framework maps were 1825 cM for IBM_Gnp2004 and 1862 cM for LHRF_Gnp2004. All loci mapped on LHRF_Gnp2004 were also projected on a consensus map IBMconsensus_Gnp2004. cDNA loci formed clusters near the centromeres except for chromosomes 1 and 8.
authors.affiliation: INRA-UPS-CNRS-INA.PG, UMR de Génétique Végétale, 91190 Gif-sur-Yvette, France. falque@moulon.inra.fr
authors.forename: Matthieu
authors.initials: M
authors.lastname: Falque
authors.forename: Laurent
authors.initials: L
authors.lastname: Décousset
authors.forename: Delphine
authors.initials: D
authors.lastname: Dervins
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Jacob
authors.forename: Johann
authors.initials: J
authors.lastname: Joets
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Martinant
authors.forename: Xavier
authors.initials: X
authors.lastname: Raffoux
authors.forename: Nicolas
authors.initials: N
authors.lastname: Ribière
authors.forename: Céline
authors.initials: C
authors.lastname: Ridel
authors.forename: Delphine
authors.initials: D
authors.lastname: Samson
authors.forename: Alain
authors.initials: A
authors.lastname: Charcosset
authors.forename: Alain
authors.initials: A
authors.lastname: Murigneux
mesh_terms: D002503:Centromere; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D019295:Computational Biology; D003433:Crosses, Genetic; D018076:DNA, Complementary; D020224:Expressed Sequence Tags; D017343:Genes, Plant; D008040:Genetic Linkage; D005819:Genetic Markers; D005828:Genetics, Population; D006824:Hybridization, Genetic; D008540:Meiosis; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D020641:Polymorphism, Single Nucleotide; D011995:Recombination, Genetic; D003313:Zea mays / Q000235:genetics*
chemical_list: D018076:DNA, Complementary; D005819:Genetic Markers