COMBINED SUBTRACTION HYBRIDIZATION AND POLYMERASE CHAIN-REACTION AMPLIFICATION PROCEDURE FOR ISOLATION OF STRAIN-SPECIFIC RHIZOBIUM DNA-SEQUENCES

AJ Bjourson, CE Stone, JE Cooper

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

A novel subtraction hybridization procedure, incorporating a combination of four separation strategies, was developed to isolate unique DNA sequences from a strain of Rhizobium leguminosarum by. trifolii. Sau3A-digested DNA from this strain, i.e., the probe strain, was ligated to a linker and hybridized in solution with an excess of pooled subtracter DNA from seven other strains of the same biovar which had been restricted, ligated to a different, biotinylated, subtracter-specific linker, and amplified by polymerase chain reaction to incorporate dUTP. Subtracter DNA and subtracter-probe hybrids were removed by phenol-chloroform extraction of a streptavidin-biotin-DNA complex. NENSORB chromatography of the sequences remaining in the aqueous layer captured biotinylated subtracter DNA which may have escaped removal by phenol-chloroform treatment. Any traces of contaminating subtracter DNA were removed by digestion with uracil DNA glycosylase. Finally, remaining sequences were amplified by polymerase chain reaction with a probe strain-specific primer, labelled with P-32, and tested for specificity in dot blot hybridizations against total genomic target DNA from each strain in the subtracter pool. Two rounds of subtraction-amplification were sufficient to remove cross-hybridizing sequences and to give a probe which hybridized only with homologous target DNA. The method is applicable to the isolation of DNA and RNA sequences from both procaryotic and eucaryotic cells.
Original languageEnglish
Pages (from-to)2296-2301
JournalApplied and Environmental Microbiology
Volume58
Issue number7
Publication statusPublished - Jul 1992

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