Rui:SingelCell
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Background
- Goal: the smallest functional unit; the exact quantity; full-length RNAs; sense vs anti-sense; all classes; at single-base resolution
- Step 1: single cell; exact quantity; the 3' end; mRNA; RNAseq
Protocols
PCR based protocol
Modified from Tang 2010, NProtocol, 5: 516
1. Single cell capture [up to ~0.1 ul]
-Maintain the integrity of living single cells before lysis (dissociation - transfer - wash - transfer) -PBS alone will cause tight attachment of cells to dish/micropipette, leading to rupture/loss of cells.
2. Cell lysis [up to ~4.55 ul]
-Mild lysis buffer to ensure efficient lysis (thoroughly and completely lysed) w/o severely interfering with RT efficiency -Negative control to rule out the contamination from the start
UP1 primer sequence: ATATGGATCCGGCGCGCCGTCGACTTTTTTTTTTTTTTTTTTTTTTTT stock solution: 100 uM working solution: 0.5 uM (1 ul to 199 ul n-f water) directly add into lysis buffer?
Cell lysis buffer -------------------------------------------------------------- Componet Original [] Volume (ul) Final [] -------------------------------------------------------------- PCR buffer II 10* 0.45 0.9* MgCl2 25 mM 0.27 1.35 mM NP40 10% 0.225 0.45% DTT 0.1 M 0.225 4.5 mM SUPERase-In 20 U/ul 0.045 0.18 U/ul RNase inhibitor 40 U/ul 0.045 0.36 U/ul UP1 primer 0.5 uM 0.125 12.5 nM dNTP mix 2.5 mM each 0.09 0.045 mM each N-F water 2.975 Total 4.45 in 5ul -------------------------------------------------------------- use fresh made lysis buffer
Procedure 2.1 Seed the cell into the 0.5 ml PCR tube with 4.45 ul lysis buffer 2.2 Centrifuge for 30s at 7,500g at 4C 2.3 Put on ice immediately 2.4 Incubate at 70C for 90s 2.5 Put on ice immediately 2.6 Centrifuge for 30s at 7,500g at 4C 2.7 Put on ice immediately for 1m
3. 1st strand cDNA synthesis [up to ~5 ul]
4. Free primer removal [up to 6 ul]
5. 3' poly(A) tailing [up to 12 ul]
6. 2nd strand cDNA synthesis [up to 22 ul per tube, 4 tubes]
7. PCR amplification [up to 41 ul per tube, 4 tubes]
8. DNA purification [elute w/ 50 ul EB buffer]
IVT-based protocol
modified from RiboAmp HS PLUS Amplification Kit, ABi, Cat#
Circulation-based protocol
Nextera library preparation
2011
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