Tutorial:STARsolo config for 10x Chromium v1, v2, v3
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10 months ago

Instigated due to another question: RNA-Seq Cell Barcode Whitelist 10X

I am adding this for the benefit of others, as there is no other resource where the following information is clearly stated, from what I have found.

These are useful for STARsolo parameter configurations when re-aligning 10X Chromium FASTQs.

10x v1

  • Whitelist, 737K-april-2014_rc.txt
  • CB length, 14
  • UMI start, 15
  • UMI length, 10 (courtesy ATpoint)

10X v2

  • Whitelist, 737K-august-2016.txt
  • CB length, 16
  • UMI start, 17
  • UMI length, 10

10x v3

  • Whitelist, 3M-Feb_2018_V3.txt
  • CB length, 16
  • UMI start, 17
  • UMI length, 12

As per ATpoint, whitelists are available from: https://github.com/10XGenomics/cellranger/tree/master/lib/python/cellranger/barcodes

These are implemented in STAR as:

  STAR \
    ...
    --soloCBwhitelist [whitelist] \
    --soloCBlen [CB length] \
    --soloUMIstart [UMI start] \
    --soloUMIlen [UMI length] \
    ...

Technically, STARsolo can also be run with --soloCBwhitelist None if no whitelist is provided.

Kevin

STAR STARsolo 10x Chromium Tutorial • 1.5k views
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Here is a link to the old v1 chemistry datasheet. If I get that correctly the "UMI" as it is called today was 10bp and called a "randomer" back in the day.

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I got data for 10X processed in Nextseq. It uses Chromium Next GEM Single Cell 3' GEM, Library Kit v3.1 but has 27 bases in R1 reads- (CCTTTCAGTCGCATCGGAACCCACTGC) White list (Whitelist, 3M-Feb_2018_V3.txt) AAACCCAAGAAACACT I also tried version 2 and without Whitelist, but still, it will not work. Any suggestion that what may be wrong in barcode specifications and read length?

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Looks like your sequencing facility sequenced R1 one base pair-short. I guess you can try specifying --soloBarcodeReadLength 27.

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Unfortunately https://singlecell.usegalaxy.eu/ it will not let me fine tune such parameters.

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Looks like you will have to run this on the command line in that case.

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