title: Molecular cytogenetic characterization of the Antirrhinum majus genome.
abstract: As a model system in classical plant genetics, the genus Antirrhinum has been well studied, especially in gametophytic self-incompatibility, flower development biology, and transposon-induced mutation. In contrast to the advances in genetic and molecular studies, little is known about Antirrhinum cytogenetics. In this study, we isolated two tandem repetitive sequences, CentA1 and CentA2, from the centromeric regions of Antirrhinum chromosomes. A standard karyotype has been established by anchoring these centromeric repeats on meiotic pachytene chromosome using FISH. An ideogram based on the DAPI-staining pattern of pachytene chromosomes was developed to depict the distribution of heterochromatin in the Antirrhinum majus genome. To integrate the genetic and chromosomal maps, we selected one or two molecular markers from each linkage group to screen an Antirrhinum transformation-competent artificial chromosome (TAC) library. These genetically anchored TAC clones were labeled as FISH probes to hybridize to pachytene chromosomes of A. majus. As a result, the relationship between chromosomes and the linkage groups (LGs) in Antirrhinum has been established.
authors.affiliation: Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
authors.forename: Dongfen
authors.initials: D
authors.lastname: Zhang
authors.forename: Qiuying
authors.initials: Q
authors.lastname: Yang
authors.forename: Weidong
authors.initials: W
authors.lastname: Bao
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Bin
authors.initials: B
authors.lastname: Han
authors.forename: Yongbiao
authors.initials: Y
authors.lastname: Xue
authors.forename: Zhukuan
authors.initials: Z
authors.lastname: Cheng
mesh_terms: D032161:Antirrhinum / Q000235:genetics*; D001483:Base Sequence; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics*; D018744:DNA, Plant / Q000737:chemistry / Q000235:genetics; D008040:Genetic Linkage; D005819:Genetic Markers; D018745:Genome, Plant; D006570:Heterochromatin / Q000235:genetics; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D008969:Molecular Sequence Data; D012689:Sequence Homology, Nucleic Acid
chemical_list: D018744:DNA, Plant; D005819:Genetic Markers; D006570:Heterochromatin