This protocol describes isolation of nuclei from left and right 10 week old mouse ovary and oviduct (pooled tissue ID: 26) from 8 founder strains (B6J, AJ, 129S1J, NZOJ, WSBJ, NODJ, PWKJ, and CASTJ), preparation of a single nucleus suspension, and fixation for single nucleus RNA-seq using Parse Biosciences. We process 1 rep from each strain per day; e.g. female rep 1 across all 8 strains. The main products we use are Parse Biosciences Nuclei Fixation Kit (v2) and Miltenyi Biotec’s gentleMACS Octo Dissociator with accessories. This protocol takes about 3.5 hours from start to finish.
The first part of the protocol describes tissue lysis and nuclei extraction using Miltenyi Biotec’s gentleMACS Octo Dissociator with accessories. The second part describes nuclei fixation using Parse Biosciences Evercode Nuclei Fixation Kit with v2 reagents. Due to low nuclei recovery, we modify the original Parse Biosciences Evercode fixation protocol (attached) by using half volumes of all fixation reagents. We do not fix extra nuclei for other assays such as SHARE-seq.