GSM9087775: P53-NoCre_mTEChi_Rep2; Mus musculus; RNA-Seq
Thymic epithelial cells were isolated using a previously published protocol (Kim & Serwold, Methods in Molecular Biology, 2019) with minor modifications. Briefly, thymi from 4-5 week-old mice were harvested and connective tissue was removed. Stromal tissue was perforated using scissors and incubated with rotation in DMEM-F12 (Sigma D6421) at room temperature for for 10min to liberate thymocytes. Remaining stromal tissue was enzymatically digested (0.5mg/mL Collagenase D (Sigma 11088858001), 0.2mg/mL DNaseI (Sigma 10104159001), 0.5mg/mL Papain (Worthington Biochemical LS003126)). Cells were stained with anti-EpCAM antibodies conjugated to APC-Cy7 and EpCAM+ cells were enriched via positive selection using magnetic anti-Cy7 beads (Miltenyi 130-091-652). Enriched fraction was stained with fluorescently conjugated antibodies for FACS or analysis. 75,000 primary mTECs were FACS-sorted directly into RULT lysis buffer (Qiagen RNEasy Kit) and total RNA was extracted using manufacturer's instructions. mRNA was enriched and RNA-seq libraries were constructed using the Illumina TruSeq Stranded mRNA Kit. Paired-end, dual-index sequencing was performed on the Illumina NovaSeq 6000 platform.