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

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!

r seurat
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updated by MANYA_BIOINFO • MANYA_BIOINFO • written by lexichuxuanli • lexichuxuanli

1 answer

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. seu_obj@meta.data).

# the only common colname in the 2 objects should be the barcode column (Cells).
meta_data <- dplyr::left_join(seu_obj@meta.data, metasample, by=Cells)
# check meta_data if correct.
seu_obj@meta.data <- meta_data
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written by Zhilong Jia Zhilong Jia

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