Enhancer deletion mice were generated as described (Durai et al., 2019 (
link)). sgRNAs flanking the - 165-kb
Zeb2 enhancer were identified using CHOPCHOP (
http://chopchop.cbu.uib.no/), and the following sgRNA sequences were used: Zeb2 −165 5’: GAGTGAGAGATCATCAAATG and Zeb2 +165 3’: GATAACGTTCTTGAAGCATA. sgRNA with the desired sequences were synthesized and conjugated with purified Cas9 protein to form the RNP complex by the Department of Pathology Micro-Injection Core at Washington University in St Louis. Day 0.5 single cell zygotes from C57Bl/6 mice were isolated and underwent electroporation at the Department of Pathology Micro-Injection Core at Washington University in St Louis. Around 60 single cell zygotes were electroporated with 8μM of RNP complex using
1mm gap cuvette (BioRad). Electroporated zygotes were then transferred into the oviducts of pseudopregnant recipient mice.
The resulting pups were screened by PCR with the following primers to identify those that had successful deletion of the enhancers of interest: 165mutant-Screening-5’: CTGCAGCAGGTTGACAAAGA; 165mutant-Screening-3’: CCTGAAGTGTACGCTCACCA. Mice with the desired deletion were then outcrossed to wildtype (WT) C57BL6/J mice, and the resulting heterozygous mice were intercrossed to generate homozygous enhancer deletion mice.
Huang X., Ferris S.T., Kim S., Choudhary M.N., Belk J.A., Fan C., Qi Y., Sudan R., Xia Y., Desai P., Chen J., Ly N., Shi Q., Bagadia P., Liu T., Guilliams M., Egawa T., Colonna M., Diamond M.S., Murphy T.L., Satpathy A.T., Wang T, & Murphy K.M. (2021). Differential usage of transcriptional repressor Zeb2 enhancers, distinguishes adult and embryonic hematopoiesis.. Immunity, 54(7), 1417-1432.e7.