1887

Abstract

Representational difference analysis of cDNA (cDNA RDA) provides a powerful technique for the identification of specific differences between two mRNA populations. The method has previously been used to analyse differential gene expression in eukaryotes, but until now has not been successfully applied to prokaryotes. A strain of with a deletion of the iron-regulated lactoferrin-binding protein A () gene, grown under iron- replete conditions, and the isogenic parent strain, grown under iron limitation, were used as a model for developing cDNA RDA for use with bacteria. In this system, the technique should specifically detect the differential expression of the gene in the parent strain, along with other genes whose expression is switched on (or up- regulated) under iron-deficient conditions. Since cDNA RDA requires high-quality, representative mRNA, a variety of methods for the isolation of RNA were evaluated. A triisopropylnaphthalene sulphonic acid/-aminosalicylic acid-based technique was found to give the best results. cDNA was prepared from total RNA isolated from the two strains and subjected to an adapted cDNA RDA procedure. The method resulted in the amplification of five major PCR products, which included fragments of the gene and the iron-regulated RTX-like toxin gene (), thus validating the technique for use with bacteria.

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1999-12-01
2020-01-29
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