Direct detection of single-nucleotide polymorphisms in bacterial DNA by SNPtrap

Hugo Ahlm Grønlund, Birgitte Moen, Jeffrey Hoorfar, Peter Rådstrøm, Burkhard Malorny, Knut Rudi

Research output: Contribution to journalJournal articleResearchpeer-review


A major challenge with single-nucleotide polymorphism (SNP) fingerprinting of bacteria and higher organisms is the combination of genome-wide screenings with the potential of multiplexing and accurate SNP detection. Single-nucleotide extension by the minisequencing principle represents a technology that both is highly accurate and enables multiplexing. A current bottleneck for direct genome analyses by minisequencing, however, is the sensitivity, since minisequencing relies on linear signal amplification. Here, we present SNPtrap, which is a novel approach that combines the specificity and possibility of multiplexing by minisequencing with the sensitivity obtained by logarithmic signal amplification by polymerase chain reaction (PCR). We show a SNPtrap proof of principle in a model system for two polymorphic SNP sites in the Salmonella tetrathionate reductase gene (ttrC).
Original languageEnglish
JournalPreparative Biochemistry and Biotechnology
Issue number2
Pages (from-to)166-174
Publication statusPublished - 2011


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