A framework for gene mapping in wheat demonstrated using the Yr7 yellow rust resistance gene

A framework for gene mapping in wheat demonstrated using the Yr7 yellow rust resistance gene
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使用 Yr7 黄锈病抗性基因展示的小麦基因图谱框架

DOI:
10.1101/793604
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发表时间:
2019
期刊:
--
影响因子:
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通讯作者:
Gardiner L
Gardiner L
中科院分区:
--
文献类型:
--
作者:
Gardiner L

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我们使用了三种方法来绘制小麦抗黄锈基因yr7的图谱,并鉴定出相关的snp。首先,我们使用传统的QTL定位方法,利用双单倍体(DH)群体,将dyr7定位到2B染色体的低重组区域。为了精细地映射QTL,我们使用了关联映射面板。两个群体都进行了SNP阵列基因分型,允许基于共同分离SNP的QTL对齐和全基因组关联扫描。对跨越QTL区间的关联面板进行分析,将区间缩小到单个单倍型块。最后,我们使用抗性和易感DH块的测序定位,在区间中确定一个与先前建议的dyr7候选基因具有高度同源性的候选基因,并用更高密度的多态性填充它们。我们强调了结合测序图谱的力量,在高重组、低LD精度的关联图谱中提供了基于基因的分离多态性的完整列表。我们的测序定位方法适用于任何性状,我们的结果验证了小麦的方法,其中有一个接近完整的参考基因组序列,我们能够定义一个包含致病基因的小区间。
We used three approaches to map the yellow rust resistance geneYr7and identify associated SNPs in wheat. First, we used a traditional QTL mapping approach using a double haploid (DH) population and mappedYr7to a low-recombination region of chromosome 2B. To fine map the QTL, we then used an association mapping panel. Both populations were SNP array genotyped allowing alignment of QTL and genome-wide association scans based on common segregating SNPs. Analysis of the association panel spanning the QTL interval, narrowed the interval down to a single haplotype block. Finally, we used mapping-by-sequencing of resistant and susceptible DH bulks to identify a candidate gene in the interval showing high homology to a previously suggestedYr7candidate and to populate theYr7interval with a higher density of polymorphisms. We highlight the power of combining mapping-by-sequencing, delivering a complete list of gene-based segregating polymorphisms in the interval with the high recombination, low LD precision of the association mapping panel. Our mapping-by-sequencing methodology is applicable to any trait and our results validate the approach in wheat, where with a near complete reference genome sequence, we are able to define a small interval containing the causative gene.
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DOI: --
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