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Rapid method for detecting SNPs on agarose gels and its application in candidate gene mapping

文献类型： 外文期刊

作者： Raghavan, Chitra 1 ; Naredo, Ma. Elizabeth B. 2 ; Wang, Hehe 2 ; Atienza, Genelou 2 ; Liu, Bin 2 ; Qiu, Fulin 3 ; McNa 1 ;

作者机构： 1.DAPO, Entomol & Plant Pathol Div, Int Rice Res Inst, Manila, Philippines

2.DAPO, Entomol & Plant Pathol Div, Int Rice Res Inst, Manila, Philippines; DAPO, Genet Resources Ctr, Int Rice Res Inst, Manila, Philippines; Guangdong Acad Agr Sci, Rice Res Inst, Guangzhou 510640, Peoples R China

3.DAPO, Entomol & Plant Pathol Div, Int Rice Res Inst, Manila, Philippines; DAPO, Genet Reso

关键词： agarose;rice

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

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收录情况： SCI

摘要： TILLING (Targeting Induced Local Lesions IN Genomes) exploits the fact that CEL I endonuclease cleaves heteroduplexes at positions of single nucleotide or small indel mismatches. To detect single nucleotide polymorphisms (SNPs) across a population, DNA pools are created and a target locus under query is PCR-amplified and subjected to heteroduplex formation, followed by CEL I cleavage. Currently, the common method used to detect cleaved products is by polyacrylamide gel electrophoresis using a high-throughput genotyping platform. Exact SNPs are then determined by sequencing. We sought to simplify the detection of CEL I-cleaved products on conventional agarose gels to make the technique more accessible to collaborating partners in developing countries where access to instrumentation could be limiting. Here, we used a panel of stress-related genes to evaluate SNP detection across 48 rice genotypes by contrasting them individually against IR64 and Nipponbare. SNP detection calls corresponded perfectly with those obtained from the Li-Cor genotypers. We were able to detect SNPs in pools of eight DNA templates, suggesting that the agarose gel system could be used to screen for SNPs with comparable throughput as that of the Li-Cor genotypers and showed that the throughput can be increased by analyzing larger amplicons (~3 kb). The agarose method offers a significant advantage by alleviating the need for labeled primers. We further demonstrated that the agarose method can be effectively used in gene mapping, an application particularly useful for parental lines with low levels of polymorphism. The lower cost and simplicity of the technique make it possible for broader applications of SNP-based markers for germplasm characterization and mapping studies.

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