For tissue dissociation, pupal brain tissue dissected at 40 hr after pupal formation was incubated with a
Papain (Worthington) and Liberase TM protease cocktail (Roche) at 25°C for 15 min in a microfuge shaker at 1,000 rpm. At 5 and 10 min into this incubation, the tissue was pipetted up and down with a P200. At 15 min, the sample was passed through a 25G 5/8-gauge needle until the tissue was completely dissociated. Digestion was inactivated by the addition of rich media with serum, and the cell suspension was passed through a 70 µm filter. To concentrate the cells, the suspension was spun down at 1,600 rpm for 8 min at 4°C. After decanting the supernatant, cells were re-suspended in ~500 µl of rich media and sorted in a
BD FACSAria II.
RNA was then isolated from sorted cells using the
RNA-min elute kit from QIAGEN. mRNA was amplified in a linear fashion using Arcuturus RiboAmp HS kit (Life Technologies). cDNA was then generated for quality assessment and paired-end Illumina sequencing libraries were prepared.
Detailed protocols are available upon request.
Tan L., Zhang K.X., Pecot M.Y., Nagarkar-Jaiswal S., Lee P.T., Takemura S.Y., McEwen J.M., Nern A., Xu S., Tadros W., Chen Z., Zinn K., Bellen H.J., Morey M, & Zipursky S.L. (2015). Ig Superfamily Ligand and Receptor Pairs Expressed in Synaptic Partners in Drosophila. Cell, 163(7), 1756-1769.