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  • Title: A BAC-based physical map of the apple genome.
    Author: Han Y, Gasic K, Marron B, Beever JE, Korban SS.
    Journal: Genomics; 2007 May; 89(5):630-7. PubMed ID: 17270394.
    Abstract:
    Genome-wide physical mapping is an essential step toward investigating the genetic basis of complex traits as well as pursuing genomics research of virtually all plant and animal species. We have constructed a physical map of the apple genome from a total of 74,281 BAC clones representing approximately 10.5x haploid genome equivalents. The physical map consists of 2702 contigs, and it is estimated to span approximately 927 Mb in physical length. The reliability of contig assembly was evaluated by several methods, including assembling contigs using variable stringencies, assembling contigs using fingerprints from individual libraries, checking consensus maps of contigs, and using DNA markers. Altogether, the results demonstrated that the contigs were properly assembled. The apple genome-wide BAC-based physical map represents the first draft genome sequence not only for any member of the large Rosaceae family, but also for all tree species. This map will play a critical role in advanced genomics research for apple and other tree species, including marker development in targeted chromosome regions, fine-mapping and isolation of genes/QTL, conducting comparative genomics analyses of plant chromosomes, and large-scale genomics sequencing.
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