Development and Characterization of Microsatellite Markers from Chromosome 1-Specific DNA Libraries of Vicia faba
An integrated approach has been developed for targeted retrieval of microsatellite markers from selected regions of the field bean (Vicia faba L.) genome. The procedure is based on a combination of advanced physical and genetic mapping techniques and includes the following steps: 1) flow-sorting of metaphase chromosomes, 2) construction of microsatellite-enriched chromosome-specific DNA libraries, 3) isolation of polymorphic microsatellite sequences from the libraries, 4) testing chromosome specificity of the microsatellites using polymerase chain reaction with purified fractions of individual chromosome types, and 5) integration of chromosome-specific markers into a genetic map. Several strategies for isolation of microsatellite clones were tested, including direct screening of non-enriched libraries with single or mixed probes and screening of the libraries after one or two rounds of enrichment. Finally, the usefulness of this approach was demonstrated by the retrieval of novel markers from a selected portion of the largest field been chromosome (No. 1).
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