For quantitating RNA levels from either polyA+ selected RNA or crude RNA preps. Solutions 10X Hybridization Buffer 0.4 M PIPES 12.1 g PIPES (Sigma #P6757) 4.0 M NaCl 23.4 g NaCl 10 mM EDTA 2.0 ml 500 mM EDTA pH to 6.7 and bring up to 100 ml with DEPC treated Q, autoclave 1X Hybridization Mixture 8 ml formamide 1 ml DEPC treated Q 1 ml 10X Hybridization Buffer 2X RNase Buffer 20 mM Tris 7.5 2 ml 1M Tris 7.5 10 mM EDTA 2 ml 500 mM EDTA 8.0 0.6 M NaCl 12 ml 5 M NaCl up to 100 ml DEPC treated Q, autoclave 20% SDS 20 g SDS up to 100 ml with Q DEPC Treated Q 1 liter mili Q water 1 ml DEPC shake overnight at 37° autoclave twice Also Needed: Proteinase K (10mg/ml in Q), RNaseA (2mg/ml), RNaseT1 (100 m g/ml). Procedure • To make the riboprobe linearize the appropriate template (5 m g) with the appropriate enzyme (5' overhang is best). Phenol/chloroform extract, EtOH ppt, wash and dry. Resuspend in 10 m l DEPC treated Q. • Mix the following: T7 SP6 6 m l DEPC Q 3 m l DEPC Q 2 m l 10X Pol. Buffer (NEB) 4 m l 5X Pol. Buffer (Promega) 1 m l 10 mM ATP 1 m l 10 mM ATP 1 m l 10 mM GTP 1 m l 10 mM GTP 1 m l 10 mM CTP 1 m l 10 mM CTP 1 m l 0.05 mM UTP 1 m l 0.05 mM UTP 1 m l RNaseIN 1 m l RNaseIN 1 m l Template (0.5 m g) 1 m l Template (0.5 m g) 5 m l a 32P UTP (800 Ci/mmol) 5 m l a 32P UTP (800 Ci/mmol) 1 m l T7 RNA Polymerase (NEB) 1 m l SP6 RNA Polymerase (Promega) 2 m l 100 mM DTT Incubate @ 37℃ 1 hour Incubate @ 40℃ 1 hour • Add 1 m l DPRF DNaseI and incubate at 37℃ for 15 minutes, repeat. • Phenol/chloroform extract and EtOH precipitate with tRNA. Wash and dry. Resuspend in 1X Hybridization Mix. • Dry down 5-20 m g RNA (crude) and resuspend in 29 m l 1X Hybridization mix. Add 1 m l riboprobe and incubate at 48℃ overnight. • Make the RNase Mixture and add 380 m l per tube. Incubate for 30 minutes at room temperature. 5 tubes 10 tubes 15 tubes 20 tubes 1.05 ml 2.1 ml 3.15 ml 4.2 ml 2X RNase Buffer 0.96 ml 1.9 ml 2.9 ml 3.86 ml DEPC Q 42 m l 84 m l 126 m l 168 m l RNaseA 42 m l 84 m l 126 m l 168 m l RNaseT1 • Add 10 m l 20% SDS, 10 m l Proteinase K and incubate at 37℃ for 15 minutes. Phenol/chloroform extract, and remove 360 m l of the aqueous phase. Add 1 ml EtOH (no salt required) and 1 m l tRNA. Spin, wash and dry. • Resuspend in 10 m l Formamide Loading Dye and run on a 7-8% sequence gel (see protocol O.1). |
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