I am absolutely new to R but I need to construct gene networks based on co-expression. The problem is that I only want to look at the genes that are co-expressed with one single gene of interest across different RNA-seq datasets from tumors. I've read through the tutorials but realized that this package is usually used for exploring networks of all the genes present in the datasets. Is there a way to just focus on one particular gene of interest as the 'hub gene' already from the begining? Or is there any other software/program that can serve this purpose better?
(sorry if this sounds ignorant but any help would be appreciated!)