Patent ID: 6838266

Claim:
A method for producing DNA, which comprises the following steps (1) to (8): (1) dividing a DNA target sequence which has a length of 1000 nucleotides or less into a 2N sections, wherein N is a positive integer greater than 1; (2) designing partial sequences having a length of 80 to 150 nucleotides which comprise the sequences of each of one of the sections of step 1 and a part of a nucleotide sequence of an adjacent section or parts of nucleotide sequences of adjacent sections, wherein the part or parts have such a length that the nucleotide sequence of the each part can base pair with a nucleotide sequence complementary thereto; (3) preparing oligomers comprising each of the 1st to Nth partial sequences of step (2) from the 5′ end of the target sequence; (4) preparing oligomers each comprising a nucleotide sequence complementary to each of the (N+1)th to (2N)th partial sequences from the 5′ end of the target sequence; (5) performing a polymerase chain reaction using the oligomer of step (3) having the Nth partial sequence from the 5′ end of the target sequence and an oligomer of step (4) having a nucleotide sequence complementary to the (N+1)th partial sequence from the 5′ end of the target sequence under conditions such that these oligomers act as primers and templates for a polymerase enzyme in the polymerase chain reaction; (6) sequencing synthesized DNAs and (7) selecting DNA having a nucleotide sequence containing the Nth and (N+1)th partial sequences from the 5′ end of the target sequence; and (8) repeating the following steps (8a) and (8b) and (8c) for successive J's, wherein J increases by a single integer, for each repetition, and wherein J is an integer, to be from 1 to N−1; (8a) performing polymerase chain reaction by using the selected DNA, an oligomer having the (N−J)th partial sequence from the 5′ end of the target sequence and an oligomer having a nucleotide sequence complementary to the (N+1+J)th partial sequence from the 5′ end of the target sequence under such a condition that the DNA and oligomers should act as primers and templates; and (8b) sequencing synthesized DNAs, and (8c) selecting DNA having a nucleotide sequence containing the (N−J)th to (N+1+J)th partial sequences, thereby producing DNA having the target sequence.