What is the relationship between QV20 and the KB Basecaller and how do they determine the length of read specifications?
The improved basecalling algorithm (the KB Basecaller) is designed to accurately call more bases out of sequencing data, and reduce manual data review time by providing per-base quality value (QV) assignment, which is a measure of basecaller accuracy. The KB Basecaller supports most chemistries and run modules available on the Applied Biosystems 3130 Series Genetic Analyzers running Data Collection v3.0 and v.3.1 Software, and is also integrated in the Applied Biosystems Sequencing Analysis v. 5.X Software and SeqScape v2.X Software. In previous versions of Data Collection Software, resolution performance for all run modules was calibrated with a 98.5% basecalling accuracy (1.5% probability of error) specification using the ABI Basecaller. Utilizing the KB Basecaller v1.2 release for Data Collection v3.0 Software, resolution performance for the all the run modules was calibrated with a quality score cutoff of QV20 (99% basecalling accuracy or a 1% probability of error) using a sliding window of 20 bases from the 3' end. Therefore, while shorter read length specifications are generated with the KB Basecaller, the calibrations are of higher basecalling accuracy. In this release, we are using the same specifications for 98.5% basecalling accuracy, which is on the conservative end, to keep the specifications uniform.
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Find additional tips, troubleshooting help, and resources within our Capillary Electrophoresis Instruments Support Center.