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Old 08-24-2020, 04:57 AM   #1
ETBA
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Default i5 / i7 dual indexing + ATAC

Hello,

I am constructing an ATAC-seq library using the standard Illumina kit (Nextera DNA Flex Library Prep, FC-121-1030). A previous user suggested dual indexing to minimise index hopping which I am grateful for. We have access to a Hiseq X-Ten (paired-end 100bp) and illumina suggests to use the reverse complement of the Index (i5) adapter sequence:

https://emea.support.illumina.com/co...0002694-14.pdf

A standard i5 adapter = AATGATACGGCGACCACCGAGATCTACAC[i5]TCGTCGGCAGCGTC

What should I order to amplify my transposed libraries? For example with the H502 i5 index: unique bases in adapter = CTCTCTAT, does that mean I would order a primer with the reverse complement (ATAGAGAG) for the unique portion of an i5 standard index? = AATGATACGGCGACCACCGAGATCTACAC [ATAGAGAG] TCGTCGGCAGCGTC instead of AATGATACGGCGACCACCGAGATCTACAC [CTCTCTAT] TCGTCGGCAGCGTC as was used in this protocol presumably becuase they used a different sequencer: https://www.encodeproject.org/docume...l_20170130.pdf

From the original ATAC-seq protocol, they add the following bases to the 3' end of a standard i5 adapter that doesn't contain a unique index sequence. I'd imagine this is to mitigate loss of the 8 base unique index, but they've also added a few bases to the 3' end of the i7 adapters (AGATGT) that do contain a unique index sequence. Should I include this (AGATGTG) to my i5 primer order and can I use these with the i7 adapters as given in the in the Buenrostro 2013 protocol which include the extra 3' bases (AGATGT)?

Best,
Eric
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Old 08-24-2020, 09:51 AM   #2
GenoMax
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Cross-posted: https://www.biostars.org/p/457238/
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