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  • Puzzing MiSeq run (failure)

    I've just had a very weird MiSeq run pop up, and there are really several things that could be wrong with it - low diversity library, V2 kit (expired), and likely drastically underloaded. The pass filter rate was just terrible. I've never seen the Q score trace look like this, though. Does anyone have any ideas? I'm just interested in getting a diagnosis at this point....
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    Given there's a bunch of bases that start with low Q-scores and continue with low Q-scores, I wonder if there's a particular tile on the flow cell that was dirty or otherwise gave bad data. On Basespace/SAV I'd go to the Flowcell Chart and select "Median Q-Score" and look at a handful of cycles to see if certain tiles are consistently giving lousy Q-scores. Also, don't forget to select 'Both Surfaces' (unless you used a nano flow cell in which case you only image one surface).

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