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  • Y-adapters better for low diversity library

    I have had a problem with base calling due to a low diversity library on Miseq. I used P5 and P7 adapters with two amplification steps. The library is a PCR product. Would Y adapters be a better option, or am I not on the right track.

  • #2
    Your adapters probably aren't the problem, it's just the fact that it's a low diversity library. What % phiX did you spike in and what was your cluster density?

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    • #3
      Y-adapters could indeed be better (by 50%; because there will be no P5toP5 and no P7toP7 ligations) but they are unlikely to be the problem, in my eyes.
      We do not know anything about your current adapters and objectives though.
      Last edited by luc; 10-08-2015, 05:09 PM.

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      • #4
        Originally posted by nrobic View Post
        I have had a problem with base calling due to a low diversity library on Miseq. I used P5 and P7 adapters with two amplification steps. The library is a PCR product. Would Y adapters be a better option, or am I not on the right track.
        With your approach, using adapters is not possible. There are some options to increase diversity of amplicons:
        1- Sequencing pool of different amplicons
        2- Spiking in a high diversity library
        3- increasing amplicons library diversity by adding 0-3 diversity nucleotides to 5' end of target specific sequences of primers (3' to adapter overhang)

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        • #5
          Also loading a lower concentration (ie lower cluster density) will help

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          • #6
            My first experiment with Y-adapters shows the base caller problem to be minimal as evaluated by the read 1-2 base intensity graph in Illumina SAV. The variant caller also shows a great reduction in false variants. I still need to load my control for comparison and repeat this finding again - Thanks

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            • #7
              PhiX

              I went as high as 20% with minimal improvement

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