1. Stock solution
(1) 5×MOPS
ddH2O 400ml
3M NaOAc (pH7.0) 6.67ml
0.5M EDTA (pH8.0) 5ml
MOPS 10.4g
NaOH ~0.875g to pH7.0
Add ddH2O to 500ml, add 500ul DEPC
Set overnight, autoclave for 15min.
(2) 0.5M Na3PO4 (pH7.2)
ddH2O 1800ml
NaH2PO4·H2O 43.6g
Na2HPO4·7H2O 183.3g
Add ddH2O to 2l, autoclave for 15min.
(3) 10×SSC
ddH2O 1800ml
NaCl 175g
Trisodium citrate 88.2g
Adjust pH to 7.0 with HCl, add ddH2O to 2l, add 2ml DEPC
Set overnight, autoclave for 15min.
(4) DEPC ddH2O
(5) 14% SDS
2. Electrophoresis
(1) Formaldehyde gel ( Pretreat comb and plate with ethanol and Rnase away)
50ml 100ml 200ml 250ml
Agarose 0.5g 1.0g 2.0g 2.5g
5×MOPS 10ml 20ml 40ml 50ml
DEPC H2O 38ml 77.5ml 155ml 194ml
Melt
65C H2O bath 10min
Add 37% Formaldehyde 2.7ml 5.4ml 10.8ml 13.5ml
Pour gently
Set 15-20min
(2) Running buffer (1×MOPS )
250ml 600ml 1000ml
DEPC H2O 200ml 480ml 800ml
5×MOPS 50ml 120ml 200ml
(3) Sample preparation (30ul)
Formamide 15ul
5×MOPS 6ul
formaldehyde 4.8ul
RNA 10ug ( less than 4.2ul)
DEPC H2O add to 30ul
65C 10min, put on ice, add 3ul 10×loading buffer.
(4) Electrophoresis ( Pretreat tank and cylinder with Sparkleen)
Pre- electrophoresis gel at 5V/cm for 5min
Load samples
Run gel at 4V/cm for 1-2h.
3. Transfer of RNA from Gel to Membrane
Wash gel with DEPC H2O 3 times ( 20min RT H2O, 10min 65C H2O, 20min RT H2O)
Wash with 10×SSC for 30min
Vacuum blot 90min at 5in pressure, using 10×SSC as transfer buffer
Rinse with 2×SSC for 5min
80C bake 30min.
4. Hybridization
(1) (Pre)hybridization solution 50ml ( 30ml for prehybridization, 20ml for hybridization)
0.5M Na3PO4 (pH7.2) 25ml
14% SDS 25ml
(2) Probe labeling
Probe 100ng
ddH2O add to 30ul
boil 5min, put on ice
5×labeling mix 10ul
d(C,T,G)TP mix (1.5mM) 2ul
BSA(10mg/ml) 2ul
Klenow(5u/ul) 1ul
P32-dATP 5ul
RT 2hrs, add 2ul 0.5M EDTA, boil 10min, G-50 micro column clean, use for hybridization.
(3) Prehybridization (65C) for more than 2 hrs( while probe labeling), hybridization (65C) overnight.
(4) Wash
14% SDS 89ml
Na3PO4 10ml
ddH2O 151ml
wash for 2 times at 65C, use 125ml wash solution each time.
(5) Strip
10×SSC 10ml
14% SDS 35ml
ddH2O 955ml
wash for 2 times in boiling solution, use 500ml solution each time.