As we know, the amount of RNA reads per cell obtained from 10X scRNA experiment vary between cells. I wonder if this is effect of technical issues or does the number of RNA reads per cell obtained from the 10X scRNA experiment depend on the amount of mRNA in that cell? For the latter to be the case, we would have to read almost all the mRNA fragments in a cell, which I don't think is likely. Thank you for your replies in advance!
I am inclined to agree with you that the reads-per-cell is dependent on the cell type and cell cycle state. In the datasets I have analyzed, I observed that immune cells tend to have far fewer reads than fibroblasts, which have fewer reads than larger epithelial cell types.
EDIT: I have also observed that macrophage populations generally have more RNA than lymphocytes. Granulocytes have even less if you even capture them in your sample.