We are experiencing problems with MiSeq runs (using 600-cycle V3 kits) at our core facility: Two week ago they ran a PhiX standard and a customer-prepared library- both worked fine. However, when they ran another library (from source A) and got no clusters. After that they rebooted the instrument and performed another volume test, which passed. Then they ran our sample. Again, the clusters had very low intensity and none of them passed filter. The clusters just didn't look right to them. I am attaching the RunInfo and RunParameter files here. We would appreciate any inputs.
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What kind of libraries are they?
We had a non-standard library from a customer a few months ago that would kill the whole flowcell, PhiX and all. I discussed it here. Illumina speculated that there might have been some PCR primer that didn't get cleaned out that was preventing the libraries from annealing. A bead cleanup of the library eventually sorted it out.
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Originally posted by GenoMax View PostRecommendation from Illumina is clear and your facility needs to follow it. Spike phiX in the next run, if that was not done (it sounds like it was not). That is the only way to allow runs with low nucleotide diversity to go through.
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Originally posted by GW_OK View PostWhat kind of libraries are they?
We had a non-standard library from a customer a few months ago that would kill the whole flowcell, PhiX and all. I discussed it here. Illumina speculated that there might have been some PCR primer that didn't get cleaned out that was preventing the libraries from annealing. A bead cleanup of the library eventually sorted it out.
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@phyllosphere: Have you seen this thread for 2x300 runs (http://seqanswers.com/forums/showthread.php?t=59558) on MiSeq. Not directly related to your original post but something to keep in mind. Great 2x300 runs with low diversity libraries are not going to happen with V3.
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Thanks @GenoMax. Yes I read almost all the threads related to MiSeq here (desperate to move on with our microbiome projects). We did get four separate good 2x300 runs with low diversity libraries on the same MiSeq (when it was relatively new), but are hitting the wall now despite repeated efforts with higher PhiX. I suspect the poor Illumina kits manufactured after 2015, as well as some of the aged components of our MiSeq, all contributed to the problem.
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Originally posted by phyllosphere View PostThe library is the mixtures of 16S and ITS amplicons. We prepared the library following The Schloss Lab Protocol and we had no problem for previous runs -even at 5% PhiX.
Was your phiX freshly denatured?
If you rerun, do a 2x250, 2x300 just don't work well.
ETA-wrote that before I saw you second run metrics. That looks great for an amplicon run on V3 (which isn't a really high bar, but I wouldn't be thinking about rerunning that). Have you clustered the data and it's bad or are you thinking it's bad just based on the q30 and PF%Microbial ecologist, running a sequencing core. I have lots of strong opinions on how to survey communities, pretty sure some are even correct.
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