Nature Genetics
6, 379 - 383 (1994)
doi:10.1038/ng0494-379
Long−range mapping of gaps and telomeres with RecA−assisted restriction endonuclease (RARE) cleavageLance J. Ferrin1
& R. Daniel Camerini-Otero1
1Genetics and Biochemistry Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA Correspondence should be addressed to R.D.C-O. RecA−assisted restriction endonuclease (RARE) cleavage is a method to perform sequence−specific cleavage of genomic DNA, and is useful in physical mapping studies. After making two modifications, we have applied this method to mapping large regions of DNA in several cell types, including a notorious gap near the Huntington disease (HD) locus on chromosome 4. RARE cleavage fragments were analysed by pulsed field gel electrophoresis and Southern blotting and the distances between cleavage sites determined with accuracy. Using RARE cleavage, the gap measured was less than 60 kilobases in length. RARE cleavage is also a straightforward technique to map the distance from a marker to a telomere. The terminal 1.7 megabases of several HD and control cell lines were mapped with no large differences between cell lines in this region.
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