Roche公司的RNase Protection Assay (RPA) protocol
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Roche公司的RNase Protection Assay (RPA) Using DIG-Labeled RNA Probes
下载网址: http://www.roche-applied-science.com/PROD_INF/BIOCHEMI/no1_03/PDF/p22_23.pdf
还有一份protocol
http://www.ualberta.ca/PERINATAL/facilities/pdf/RNase%20Protection%20Assay.pdf
可能出现的问题及应对措施
1.No Discrete Bands, Only Smears--RNA degraded, or the the RNase Digestion was too harsh.Try reducing the concentration of RNase A to 1 mg/ml or digest for a shorter period of time. Check your RNA for condition.
2.Bands Too Large, High Molecular Weight Artifacts--The RNase Digestion was inefficient and unable to effectively trim down the RNA:RNA duplexes.Try RNasing longer or increasing the RNase concentration. /Incompletely linearized template DNA.
3.Bands in the Negative Control Lane-- Inefficent RNase Digestion (see above)/Sense template contaminating riboprobe/Insufficent DNase digestion of riboprobe.
4.Many Lower Molecular Weight Bands Under the Main Band--There can either be premature stop sites in the probe leading to smaller probe sizes, therefore smaller products. This can also stem from overdigestion by RNase A which will break-up the duplexes if the concentration or digestion time is too long.
5.No Signal At All: You did generate an antisense probe right?