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Nucleic Acids Research, 2000, Vol. 28, No. 2 E6-e6
© 2000 Oxford University Press

A method for preparing genomic DNA that restrains branch migration of Holliday junctions

Thorsten Allers and Michael Lichten*

Laboratory of Biochemistry, Division of Basic Sciences, Building 37, Room 4C03, National Cancer Institute, 37 Convent Drive, Bethesda, MD 20892-4255, USA

The Holliday junction is a central intermediate in genetic recombination. This four-stranded DNA structure is capable of spontaneous branch migration, and is lost during standard DNA extraction protocols. In order to isolate and characterize recombination intermediates that contain Holliday junctions, we have developed a rapid protocol that restrains branch migration of four-way DNA junctions. The cationic detergent hex-adecyltrimethylammonium bromide is used to lyse cells and precipitate DNA. Manipulations are performed in the presence of the cations hexamine cobalt(III) or magnesium, which stabilize Holliday junctions in a stacked-X configuration that branch migrates very slowly. This protocol was evaluated using a sensitive assay for spontaneous branch migration, and was shown to preserve both artificial Holliday junctions and meiotic recombination intermediates containing four-way junctions.

* To whom correspondence should be addressed. Tel: +1 301 496 3393; Fax: +1 301 402 7437; Email: lichten@helix.nih.gov


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