Apr 2, 2020

A rapid, super-selective method for detection of single nucleotide variants in C. elegans

BioRxiv : the Preprint Server for Biology
D. Touroutine, Jessica E Tanis


With the widespread use of single nucleotide variants generated through mutagenesis screens, the million mutation project, and genome editing technologies, there is pressing need for an efficient and low-cost strategy to genotype single nucleotide substitutions. We have developed a rapid and inexpensive method for detection of point mutants through optimization of SuperSelective (SS) primers for end point PCR in Caenorhabditis elegans. Each SS primer consists of a 5' "anchor" that hybridizes to the template, followed by a non-complementary "bridge," and a "foot" corresponding to the target allele. The foot sequence is short, such that a single mismatch at the terminal 3' nucleotide destabilizes primer binding and prevents extension, enabling discrimination of different alleles. We explored how length, stability, and sequence composition of each SS primer segment affected selectivity and efficiency in order to develop simple rules for primer design that allow for distinction between any mismatches in various genetic contexts over a broad range of annealing temperatures. Manipulating bridge length affects amplification efficiency, while modifying the foot sequence can increase discriminatory power. Flexibility in the positioning ...Continue Reading

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Mentioned in this Paper

Exploration With a Probe
Analysis Using Pyrosequencing
Molecular Probe Techniques
Nucleic Acid Sequencing
Isolate - Microorganism
Laboratory Culture

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