I have a tpm gene expression matrix (single-cell RNA-seq data) from a publication which I would like to use to explore expression of my gene of interest. The single-cell data consists of cells from 10 conditions. I'd like to look at expression of my gene of interest in these conditions. Ultimately I'd like to create a visualisation showing the proportion of cells in each condition that express my gene of interest.
I've created a SingleCellExperiment object from the tpm counts, but I'm not sure how to determine the proportion of cells in each condition that express my gene of interest, what cutoff to use for expression, etc. Additionally, as well as proportion of cells, is there a good way to determine average expression of the gene for each condition? Something simple like a bar plot is all I wish to produce. Any recommended packages etc? Any advice is greatly appreciated!
Edit to add example data:
# SCE object class: SingleCellExperiment dim: 31211 2098 metadata(0): assays(1): tpm rownames(31211): ENSMUSG00000000001 ENSMUSG00000000003 ... ENSMUSG00000118639 ENSMUSG00000118640 rowData names(2): V1 V2 colnames(2098): SRR5993298 SRR5993299 ... SRR5995502 SRR5995505 colData names(2): V1 sample_type reducedDimNames(0): spikeNames(0): # sample_type stored in colData is condition for each cell/run (SRRxxxx) in same order as colnames sample_type <fctr> 659 CK_2w_m2 663 CK_2w_m2 664 CK_2w_m2 665 CK_2w_m2 666 CK_2w_m2 667 CK_2w_m2