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Abstract
We present alternative and improved protocols for in situ analysis of single copy genes in prokaryotes. Primed in situ amplification (PRINS) and cycle PRINS were used to detect, via the incorporation of a fluorescein labelled nucleotide, the presence of specific genes carried on both high and low copy number plasmids in individual cells of Escherichia coli and a marine bacterium, SW5. The optimised protocols described enabled a significant reduction in non-specific signals whilst maintaining high fluorescent activity via labelled nucleotide incorporation. In addition, nucleic acids were amplified linearly and were retained within the permeabilised microbial cells. These methods provide considerable advances in sensitivity, specificity and reliability compared to current protocols for bacterial in situ nucleic acid amplification.
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