Bernardo Amy, Wang Shan, St Amand Paul, Bai Guihua
Department of Plant Pathology, Kansas State University, Manhattan, Kansas, United States of America.
Department of Agronomy, Kansas State University, Manhattan, Kansas, United States of America.
PLoS One. 2015 Dec 1;10(12):e0143890. doi: 10.1371/journal.pone.0143890. eCollection 2015.
With the advent of next generation sequencing (NGS) technologies, single nucleotide polymorphisms (SNPs) have become the major type of marker for genotyping in many crops. However, the availability of SNP markers for important traits of bread wheat (Triticum aestivum L.) that can be effectively used in marker-assisted selection (MAS) is still limited and SNP assays for MAS are usually uniplex. A shift from uniplex to multiplex assays will allow the simultaneous analysis of multiple markers and increase MAS efficiency. We designed 33 locus-specific markers from SNP or indel-based marker sequences that linked to 20 different quantitative trait loci (QTL) or genes of agronomic importance in wheat and analyzed the amplicon sequences using an Ion Torrent Proton Sequencer and a custom allele detection pipeline to determine the genotypes of 24 selected germplasm accessions. Among the 33 markers, 27 were successfully multiplexed and 23 had 100% SNP call rates. Results from analysis of "kompetitive allele-specific PCR" (KASP) and sequence tagged site (STS) markers developed from the same loci fully verified the genotype calls of 23 markers. The NGS-based multiplexed assay developed in this study is suitable for rapid and high-throughput screening of SNPs and some indel-based markers in wheat.
随着下一代测序(NGS)技术的出现,单核苷酸多态性(SNP)已成为许多作物基因分型的主要标记类型。然而,可有效用于标记辅助选择(MAS)的面包小麦(Triticum aestivum L.)重要性状的SNP标记仍然有限,且用于MAS的SNP检测通常是单重的。从单重检测转向多重检测将允许同时分析多个标记并提高MAS效率。我们从小麦中与20个不同的数量性状位点(QTL)或农艺重要性基因连锁的基于SNP或插入缺失的标记序列中设计了33个位点特异性标记,并使用Ion Torrent Proton测序仪和定制的等位基因检测流程分析扩增子序列,以确定24个选定种质资源的基因型。在这33个标记中,27个成功实现了多重检测,23个的SNP检出率为100%。对从相同位点开发的“竞争性等位基因特异性PCR”(KASP)和序列标签位点(STS)标记的分析结果充分验证了23个标记的基因型判定。本研究中开发的基于NGS的多重检测适用于小麦中SNP和一些基于插入缺失的标记的快速高通量筛选。