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Old 07-15-2011, 12:46 AM   #1
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Location: Cambridge

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Default 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?


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.
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Old 09-06-2013, 12:34 PM   #2
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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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Old 09-09-2013, 08:26 AM   #3
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Also, you have to have them synthesized with a phosphothioate bond between the last two 3' bases.
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adapter, custom, homemade, truseq

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