Stepwise partially overlapping primer-based PCR for genome walking.
Stepwise partially overlapping primer-based PCR for genome walking.
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用于基因组步移的基于引物的逐步部分重叠 PCR
DOI:
10.1186/s13568-018-0610-7
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发表时间:
2018-05-09
期刊:
影响因子:
3.7
通讯作者:
Li H
中科院分区:
文献类型:
--
作者:
Chang K;Wang Q;Shi X;Wang S;Wu H;Nie L;Li H
A stepwise partially overlapping primer-based PCR (SWPOP-PCR) method for isolating flanking unknown DNA regions was developed, which comprises three rounds of nested PCRs sequentially driven by SWPOP primer-nested specific primer pairs. SWPOP primer set is characterized by a partial overlap of 10 bp with 3′-part of the latter primer is identical to 5′-part of the former one, which makes the SWPOP primer in use anneal to SWPOP site of the prior PCR product only at relatively low temperature. For each PCR, target single-stranded DNA primed by the SWPOP primer in the exclusive one low-stringency cycle is converted into double-stranded form in the following high-stringency cycle due to the presence of a perfect annealing site for the specific primer. This double-stranded DNA bounded by the specific primer and the SWPOP primer is exponentially amplified in the remaining high-stringency cycles. Non-target single-stranded DNA, however, cannot be amplified given the lack of perfect complementary sequences for any primers. Therefore, the partial overlap of a SWPOP primer set preferentially synthesizes target products but inhibits nonspecific amplification. We successfully exploited SWPOP-PCR to obtain the DNA sequences flanking glutamate decarboxylase gene (gadA) locus inLactobacillus brevisNCL912 and hygromycin gene (hyg) integrated in rice.
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