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        RNase Protection Assay for Quantifying Gene Expression Levels

        互联网

        454
        Quantifying the level of mRNA is central to the study of mammalian gene expression. Conventional approaches such as Northern blotting are often prone to low sensitivity and reproducibility. The RNase protection assay (RPA) provides a sensitive alternative for the detection and quantification of mRNA. The RPA is based on the hybridization in solution of a labeled single-stranded antisense RNA probe with a target mRNA. After hybridization, single-strand specific RNases are then used to digest away unhybridized RNA. The hybrid can be resolved by a denaturing gel. Subsequent detection will reveal the appropriate-sized gel band corresponding to the target mRNA. The major advantage of RPA is the high sensitivity and the simultaneous detection and quantification of multiple mRNA targets in a single RNA sample. The primary limitation of RPA is the lack of information on transcript size.
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