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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Construction of a bacterial artificial chromosome library, determination of genome size, and characterization of an Hsp70 gene family in Phytophthora nicotianae.
Fungal Genetics and Biology : FG&B 2004 March
The oomycete plant pathogen Phytophthora nicotianae causes diseases on a wide range of plant species. To facilitate isolation and functional characterization of pathogenicity genes, we have constructed a large-insert bacterial artificial chromosome (BAC) library using nuclear DNA from P. nicotianae H1111. The library contains 10,752 clones with an average insert size of 90 kb and is free of mitochondrial DNA. The quality of the library was verified by hybridization with 37 genes, all of which resulted in the identification of multiple positive clones. The library is estimated to be 10.6 haploid genome equivalents based on hybridization of 23 single-copy genes and the genome size of P. nicotianae was estimated to be 95.5 Mb. Hybridization with a nuclear repetitive DNA probe revealed that 4.4% of clones in the library contained 28S rDNA. Hybridization of total genomic DNA to the library indicated that at least 39% of the BAC library contains repetitive DNA sequences. A BAC pooling strategy was developed for efficient library screening. The library was used to identify and characterize BAC clones containing an Hsp70 gene family whose four members were identified to be clustered within approximately 18 kb in the P. nicotianae genome based on the physical mapping of eight BACs spanning a genomic region of approximately 186 kb. The BAC library created provides an invaluable resource for the isolation of P. nicotianae genes and for comparative genomics studies.
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