| 摘要 |
A method of normalizing contents of DNA fragments in a sample among respective DNA fragments, comprising: preparing DNA fragments in which adaptors each comprising an oligodeoxyribonucleotide are attached to both ends of each DNA fragment in the sample to form restriction enzyme recognition sites that do not exist in the DNA fragments in the sample, and at least a part between the restriction enzyme recognition sites at both ends, including the restriction enzyme recognition sites, is double-stranded; denaturing the prepared double-stranded DNA fragments; hybridizing the denatured DNA fragments under a condition that a part of the DNA fragments remains single-stranded; cleaving the hybridized double-stranded DNA fragments with a restriction enzyme having a cleavage site exclusively in the adaptors; and performing PCR using the obtained DNA fragments as templates and using a primer having a nucleotide sequence complementary to a nucleotide sequence of the adaptors before the cleavage; and a subtraction method comprising performing normalization by the method.
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