The Low Range ssRNA Ladder is a
set of 6 RNA molecules produced by in vitro transcription
of a mixture of 6 linear DNA templates.
The ladder sizes are: 1000, 500, 300, 150, 80 and
50 bases. The 300 base fragment is at double
intensity to serve as a reference band. This ladder
is suitable for use as an ssRNA size standard
on denaturing polyacrylamide-urea gels, and on
denaturing or native agarose gels.
Usage Recommendation
This marker was not
designed for precise quantification of ssRNA
mass.
Denaturing vs. Native Agarose Gels
It is common
practice to electrophorese RNA on a fully
denaturing agarose gel, such as one containing
formaldehyde (1). However, in many cases it
is possible to run RNA on a native agarose gel
and obtain suitable results. In fact, it has been
demonstrated that treatment of RNA samples in
a denaturing buffer maintains the RNA molecules
in a denatured state, during electrophoresis, for at least 3 hours (2,3). The use of native agarose
gels eliminates problems associated with toxic
chemicals and the difficulties encountered when
staining and blotting formaldehyde gels.
Sample Preparation
The Low Range ssRNA
Ladder is also compatible with formaldehydebased
loading buffers.
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