title: Single-gene detection and karyotyping using small-target fluorescence in situ hybridization on maize somatic chromosomes.
abstract: Combined with a system for identifying each of the chromosomes in a genome, visualizing the location of individual genetic loci by fluorescence in situ hybridization (FISH) would aid in assembling physical and genetic maps. Previously, large genomic clones have been successfully used as FISH probes onto somatic chromosomes but this approach is complicated in species with abundant repetitive elements. In this study, repeat-free portions of sequences that were anchored to particular chromosomes including genes, gene clusters, large cDNAs, and portions of BACs obtained from public databases were used to label the corresponding physical location using FISH. A collection of probes that includes at least one marker on each chromosome in the maize complement was assembled, allowing a small-target karyotyping system to be developed. This set provides the foundation onto which additional loci could be added to strengthen further the ability to perform chromosomal identification in maize and its relatives. The probes were demonstrated to produce signals in several wild relatives of maize, including Zea luxurians, Z. diploperennis, and Tripsacum dactyloides.
authors.affiliation: Division of Biological Sciences, University of Missouri, Columbia, Missouri 65211, USA.
authors.forename: Jonathan C
authors.initials: JC
authors.lastname: Lamb
authors.forename: Tatiana
authors.initials: T
authors.lastname: Danilova
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Bauer
authors.forename: Julie M
authors.initials: JM
authors.lastname: Meyer
authors.forename: Jennifer J
authors.initials: JJ
authors.lastname: Holland
authors.forename: Michael D
authors.initials: MD
authors.lastname: Jensen
authors.forename: James A
authors.initials: JA
authors.lastname: Birchler
mesh_terms: D002874:Chromosome Mapping / Q000379:methods*; D032461:Chromosomes, Plant / Q000235:genetics*; D017931:DNA Primers; D015342:DNA Probes; D017343:Genes, Plant / Q000235:genetics*; D017404:In Situ Hybridization, Fluorescence / Q000379:methods*; D007621:Karyotyping; D013045:Species Specificity; D003313:Zea mays / Q000235:genetics*
chemical_list: D017931:DNA Primers; D015342:DNA Probes