How to add labels to a Seurat object, matching the barcodes?

Question

[lexichuxuanli]

Hi, I'm trying to add a file that contains barcode-label pairs to a Seurat object I have. The file looks like this:

Cells   0
ATGATCGTCTACCACC    Cluster 6
GAAGCCCAGTTACTCG    Cluster 2
CAAGCTACACGGTGTC    Cluster 7
CACAACACACAGTATC    M8
CATCCACGTTCGGTTA    Cluster 2
ATGCATGGTGTGGTCC    Cluster 3
ACCCTTGTCTCGGGAC    Cluster 6

The issue is that the barcodes in this new file do not match the barcodes or the matrix file I originally used to create the Seurat object. It contains fewer rows due to different filtering standards. Is there a way to merge these two files and removing rows that do not appear in the labels file?

Thank you!

[MANYA_BIOINFO]

How did you add a cluster column with barcode?

Answer 1

[Zhilong Jia]

Filtering and joining your label file (e.g. naming metasample after reading to R) based on the barcodes that existed in the seurat object (e.g. [e-mail]).

# the only common colname in the 2 objects should be the barcode column (Cells).
meta_data <- dplyr::left_join([e-mail], metasample, by=Cells)
# check meta_data if correct.
[e-mail] <- meta_data