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  • Homemade TruSeq adapters

    Hi all, for various reason I am generating homemade TruSeq adapters. After annealling the universal and index oligos, they run at ~65bp on a 2.5% gel as I expected. However, Illumina TruSeq adapters from the kit, run as a positive control, were at ~100bp. Anyone have any experience of why this is (given they are supposed to be ~65bp)? Is it anything to do with the Y structure and does this, presumably, mean that my homemade adapters have not annealed properly?

    Thanks,

    nb. To anneal I mixed eqimolar amounts of index and univeral oligos in 50mM NaCL, incubated at 95C for 5 min and allowed to cool to RT in the heat block (2hr). The oligos are modifed 5'phosphate and 3'phosphorothioate, respectively.

  • #2
    Are your adapters methylated? Do you know that you are using the same sequences with the same double stranded/single stranded lengths? What do they look like on a denaturing gel?

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    • #3
      Also, you have to have them synthesized with a phosphothioate bond between the last two 3' bases.

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