Can DropletUtils Package be used to identify cells for 10X VDJ data ?
1
0
Entering edit mode
xingxd16 ▴ 20
@xingxd16-20156
Last seen 5.7 years ago

Hi all :

  • The 10X document says the cell calling algorithm for expression data and TCR data are quite different . I want to make sure that if I can still use the DropletUtils to identify cells in 10X 5` TCR data. If can , how to perform , which functions shold I employ and which paramaters shouls I pay attentions.

Thanks

DropletUtils 10X 5` TCR single cells • 1.3k views
ADD COMMENT
0
Entering edit mode
Aaron Lun ★ 28k
@alun
Last seen 53 minutes ago
The city by the bay

I don't deal much with TCR data, so I can't really say for sure. But I don't see why you couldn't use emptyDrops. In principle, the same problem of ambient contamination would apply for TCR droplet data. One could imagine testing whether each droplet's TCR sequences were significantly different from the TCR sequences detected in the ambient pool.

Practically speaking, there are two major challenges. The first is wrestling the CellRanger TCR output data frame into a matrix that emptyDrops will accept. This would require basically one row for every unique sequence for every TCR component; possibly a lot of rows, which will make emptyDrops run a bit slower. The other problem is whether or not the defaults are appropriate - lower=100 is a pretty sensible default for RNA-seq, but you will have to judge this separately based on the UMI counts in TCR data. Similarly, if the barcode rank plots don't have a knee point, I would disable the retain= option.

ADD COMMENT

Login before adding your answer.

Traffic: 665 users visited in the last hour
Help About
FAQ
Access RSS
API
Stats

Use of this site constitutes acceptance of our User Agreement and Privacy Policy.

Powered by the version 2.3.6