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ALKALI HYDROLYSIS OF BAC DNA BEFORE RANDOM-PRIMER LABELLING |
Breaking (shearing) DNA by Alkali Hydrolysis Suitable for BAC clones before labelling using random-primer (random priming, oligolabeling) labeling (which is best and most random with shorter fragments than the full-length BACs; autoclaving of syringing the DNA requires too much volume). 300 ng DNA + 6.5 ul 4M NaOH made up to 155 ul, final NaOH 200 mM Mix and incubate room temperature 20min Add 65 ul 5M ammonium acetate, 550 ul ice cold 100% ethanol (total volume 770ul) Allow to precipitate (e.g. 2 hr), centrifuge as usual and redissolve are required. Trude Schwarzacher September 2004. |