Hi @vaishnavi.nagesh and all, I solved the issue of mapping human-to-mouse ENSEMBL gene IDs that I mentioned this morning (I used the approach described here)
As a result, the text file now has a list of mouse ENSEMBL gene IDs that you can use for imputation, derived from the gene sets most closely related to each phenotype.
I’m now working on steps 3-4 above. Will share code once I’m finished.