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- W14880015 abstract "Intact chromosomal DNAs are routinely prepared by embedding cells in agarose plugs before lysis. The large sizes of the genomic DNAs cause their retention while other macromolecules diffuse into and out of the gel matrix during lysis, washing and restriction cleavage incubations. However, in an analysis of agarose-embedded chromosomal DNAs cleaved with restriction enzymes, fragments larger than 30 kilobases were found to have eluted from the gel plugs. Since loss of fragments from gel plugs may affect qualitative and quantitative interpretations of electrophoretic patterns, an analysis of the diffusion of DNA segments from agarose plugs was performed. The two variables monitored were the time dependence and the DNA fragment size dependence of the diffusion process. The results indicate that small fragments (less than or equal to 2 kilobases) are quickly lost from 1% agarose gel plugs; moreover, significant amounts of large DNA segments (i.e., the 48.5-kilobase lambda phage chromosome) are also lost. In addition to urging caution in the analysis of restriction cleavage data, these observations suggest that intact small organelle genomes and extrachromosomal DNAs also may be lost from genomic DNAs prepared in agarose gel plugs." @default.
- W14880015 created "2016-06-24" @default.
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- W14880015 date "1990-11-01" @default.
- W14880015 modified "2023-10-18" @default.
- W14880015 title "Unexpected loss of genomic DNA from agarose gel plugs." @default.
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