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An Animal-Free DNase I


Digestion of DNA to undetectable levels is important in many molecular biology applications. For instance, accurate quantitation of RNA targets by RT-PCR requires the removal of contaminating genomic DNA targets. In vitro transcribed RNA is also frequently treated with DNase to remove template DNA in both research and pharmaceutical applications. Ambion now supplies a recombinant DNase I that is prepared in a host with little to no RNase activity. The host is non-animal derived and the enzyme is purified through a process devoid of any animal byproducts.


Isolating RNase-free DNase I is a Challenge
DNase I has historically been prepared from bovine pancreas, one of the richest sources of RNase activity (~1 mg RNase A per gram of tissue). Therefore, it is often hard to obtain DNase I sufficiently free of RNase that it will not compromise RNA analysis experiments. Providing a high quality, RNase-free DNase I is very important to Ambion. This is borne out in a recent Biotechniques article (Matthews et al, 2002) that compared several different manufacturer's DNase I products (see sidebar at right).


A Pure Source of DNase I
Ambion employs stringent purification protocols and qualifies our bovine-derived DNase I at concentrations 5X or greater than that recommended for use. Now Ambion goes a step further by providing an alternative to bovine DNase I, recombinant DNase I (rDNase I), that further eliminates residual RNase and other copurified contaminants. rDNase is a highly purified product derived from cloned bovine DNase I. The rDNase I is prepared in a host that has RNase levels that are 1 x 107 fold lower than bovine pancreas.
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