The use of agarose gels for separating DNA of various size
classes has blossomed with the advent of restriction endonucleases
(1, 2). However, the purification of DNA fragments from
the agarose matrix for further study has long been problematic.
Although several techniques have been devised for this purpose
(3-12), none has satisfactorily eliminated the problems of incomplete
separation of agarose from DNA, degradation or other
modifications of DNA (including the loss of "restrictability"),
low yield, inconvenience, etc. (13). The problems are often
magnified when large preparative gels are used or when multiple
samples are analyzed.
We report here two simple techniques for separating DNA
from agarose. Both techniques involve as a first step the solubilization
of agarose in the chaiotropic salt, NaI. The second step
is either binding of the DNA to glass or selective precipitation
with acetone. The techniques are used jointly for some work;
the acetone precipitation technique to locate specific fragments
of DNA in resolving gels and to measure the proportion of the
probe complementary to each fragment, and the glass-binding
method to recover the fragments for further study.
The use of agarose gels for separating DNA of various sizeclasses has blossomed with the advent of restriction endonucleases(1, 2). However, the purification of DNA fragments fromthe agarose matrix for further study has long been problematic.Although several techniques have been devised for this purpose(3-12), none has satisfactorily eliminated the problems of incompleteseparation of agarose from DNA, degradation or othermodifications of DNA (including the loss of "restrictability"),low yield, inconvenience, etc. (13). The problems are oftenmagnified when large preparative gels are used or when multiplesamples are analyzed.We report here two simple techniques for separating DNAfrom agarose. Both techniques involve as a first step the solubilizationof agarose in the chaiotropic salt, NaI. The second stepis either binding of the DNA to glass or selective precipitationwith acetone. The techniques are used jointly for some work;the acetone precipitation technique to locate specific fragmentsof DNA in resolving gels and to measure the proportion of theprobe complementary to each fragment, and the glass-bindingmethod to recover the fragments for further study.
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