Abstract
Molecular analysis of many problems in genetics would be facilitated by the ability to construct restriction site maps of long stretches of genomic DNA and to directly place genes on these maps. Pulsed-field gradient gel electrophoresis allows measurement of the size of DNA fragments up to at least 2,000 kilobase pairs (kb) long and we have used this technique here to map sites for one class of infrequently cutting restriction enzyme over a total of 1,500 kb of mouse genomic DNA. The sites for these enzymes tend to be clustered in the genome. These clusters may correspond to the short stretches of C + G-rich unmethylated DNA often associated with mammalian genes.
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