Transcriptome and complexity-reduced, DNA-based identification of intraspecies single-nucleotide polymorphisms in the polyploid Gossypium hirsutum L.
Bottom Line: We have used transcriptome and restriction site-associated DNA sequencing to identify varietal SNPs among 18 G. hirsutum varieties based on the rationale that varietal SNPs can be more confidently called when flanked by subgenome-specific SNPs.From restriction site-associated DNA sequencing data, we identified an additional 3090 varietal SNPs between two of the varieties.A G. hirsutum genetic map with 1244 SNP markers was constructed covering 5557.42 centiMorgan and used to map qualitative and quantitative traits.
Affiliation: CSIRO Plant Industry, Canberra, ACT 2601, Australia Qianhao.Zhu@csiro.au Iain.Wilson@csiro.au.Show MeSH
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Mentions: Using this rationale, we deployed an analytical approach to identify only the varietal SNPs among our RNA-seq data that were flanked by at least one subgenome-specific SNP. The approach was first tested using the short reads from four varieties (MCU-5, Siokra 1−4, DeltaOpal and Sicot 70), and this identified 4894 varietal SNPs. Ten of the predicted varietal SNPs and 10 equivocal SNPs without a supporting adjacent subgenome-specific SNP were selected for validation by converting them to CAPS markers. Of the 10 predicted varietal SNPs with flanking subgenome-specific SNP(s), 7 were confirmed to be polymorphic. Two such examples are shown in Figure 2. In contrast, of the 10 equivocal SNPs, a polymorphism was confirmed in only one case, supporting our hypothesis. We then extended the analysis to call varietal SNPs by parallel processing the RNA-seq data from all 18 varieties. In total, 37,413 nonredundant varietal SNPs were identified among these G. hirsutum varieties (File S1).
Affiliation: CSIRO Plant Industry, Canberra, ACT 2601, Australia Qianhao.Zhu@csiro.au Iain.Wilson@csiro.au.