Application of next generation sequencing of a begomovirusresistant. KASPar assay for SNP detection of the Ty1-Ty3 region
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1 Application of next generation sequencing of a begomovirusresistant inbred to design a KASPar assay for SNP detection of the Ty1-Ty3 region Menda, N. 1, S. Strickler 1, D.M. Dunham 1, D.P. Maxwell 2, L. Mejia 2, G.B. Martin 1, and L.A. Mueller 1 1) Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, NY, USA 2) Semillas Tropicales, S.A., Guatemala
2 Luis Mejia San Carlos University (Retired) Semillas Tropicales Guatemala
3 Guatemala, Central America TYLCV and several bipartite begomoviruses
4 FAVI 9 - (I902 x S) Hebrew University of Jerusalem Resistant Hybrid 150 g fruit Determinant V, F1, F2 Favi Vidavski
5 Gh13 inbred selected from Favi 9 (h902 x S inbred) Gh13 early Oct Commercial Hybrid Nov.2012 Opportunity to use WGS to search for introgressions (TBRT meeting, Ithaca, NY 2011)
6 SGN Staff: Re-sequencing assembly of Gh13 WGS using Heinz 1706 as the reference sequence 20X coverage, Illumina sequencing Assembly: reference sequence and de novo GBrowse available (SGN site) SNP density plots (10-kb window)
7 Gh13 compared with Heinz1706 Mi Ty3 Ty1 TG97
8 SNP plot # SNPs/10 kb # nt s in gaps/10 kb
9 How does the SNP plot data from whole genome sequencing of Gh13 compare with data from the SolCap Illumina SNP chip for Chromosome 6?
10 Solcap Illumina Chip UC-Davis Allen van Dynze SolCap code Mbp Gh13-R HUJ-S Poly SGN solcap_snp_sl_ BB BB M solcap_snp_sl_ BB BB M solcap_snp_sl_ BB BB M solcap_snp_sl_ AA BB P solcap_snp_sl_ BB AA P solcap_snp_sl_ BB AA P solcap_snp_sl_ BB BB M solcap_snp_sl_ AA BB P solcap_snp_sl_ BB AA P solcap_snp_sl_ BB AA P solcap_snp_sl_ AA BB P solcap_snp_sl_ NC BB M solcap_snp_sl_ AA BB P solcap_snp_sl_ BB AA P solcap_snp_sl_ AA AA M solcap_snp_sl_ AA AA M solcap_snp_sl_ BB BB M
11 Verlaan, M.G., D. Szinay, S.F. Hutton, H. de Jong, R. Kormelink, R.G.F. Visser, J.W. Scott, Y. Bai. Chromososomal rearrangements between tomato and Solanum chilense hamper mapping and breeding of the TYLCV resistance gene Ty-1. Plant J. (2011) 68: Source of Ty1: two commercial hybrids; Ty1 from S. chilense LA1969 Source of Ty3: Scott-Hutton program, S. chilense LA2779
12 Disease tests on progenies of informative recombinants with TYLCV mapped Ty-1 to the long arm between markers MSC and MSc , an interval overlapping with the reported Ty-3 region, which led to the indication that Ty-1 and Ty-3 may be allelic. Verlaan et al., 2011
13 Ty1-Ty to 30.9 Mbp Verlaan et al., 2011
14 WGS SNP density plot ch06: 30.6 to Mbp Gbrowse (SGN) Verlaan et al. Ty3, SCAR Marker (31.5, P6-25) 34.2
15 Marker: P6-25F2/P6-25R5 (Chromosome 6, Mbp) ty3 Ty3 Ty3a Ty3b Ty3b Ty3b, 660 bp = S. chilense LA1969 (100%) (Ji, Jensen, Melgar, Maxwell, Sept. 07)
16 AS-PCR, detection of a SNP (G/A) KASP, from LGC Genomics ( Forward sense, with FAM or VIC Q Q G A Common primer reverse sense Fluorescent reading of 96, 384, 1536 well plates A = Resistant genotype G = Susceptible genotype
17 Assured Excellence in Plant Genetic Analysis Ag Biotech uses KASP technology for SNP detection of tomato traits
18 SL2.40ch06:30,600, ,900,000 Ty1-Ty3 region, Verlaan et al. Example of Strategy Pick target gene or region Design PCR primers Sequence fragments Align sequences, pick SNP Design KASP primers
19 An Example of KASPar Primer design PCR fragment sequence alignment inbred locus forward primer sequence SNP 1-30 nt reverse primer nt, 40-50% Heinz ty nt, 40-50% GC's T GC's Purple Russian ty same sequence T same sequence Gh13-WGS Ty3 same sequence G same sequence Gh13-PCR Ty3 same sequence G same sequence Gc9 (LA2779) Ty1-Ty3 same sequence G same sequence Inbred-ST1 (LA2779) Ty1-Ty3 same sequence G same sequence Gc171 (LA1932) Ty3a same sequence G same sequence LA1969 Ty3b same sequence G same sequence
20 KASPar Assay on known genotypes Q Q Forward sense, with FAM or VIC T G Common primer reverse sense G = Resistant genotype (RED) T = Susceptible genotype (BLUE) Het = (Green) SNP170 Ag Biotech
21 SNP170 Ag BioTech Genotype CALL Germplasm Mi TG97 (Ty1) P6-25 (Ty3) SNP170 Purple Russian S S S S HUJ-VF S S S S Heinz 1706 S S S S M82 S S S S Motelle R S S S Anahu R S S S Rodeo R S S S Celebrity R S S S Amelia R S S S Plum Crimson R S S S Gh13 S S Ty3/Ty3 R Gc9 S Ty1/Ty1 Ty3/Ty3 R Gc171 S S Ty3a/Ty3a R Inbred-Ty1 (LA1969) S Ty1/Ty1 Ty3b/Ty3b R Llanero** R S Ty3a/ty3 Het Marwa**? Ty1/ty1 Ty3b/ty3 Het Tritiet** R Ty1/ty1 Ty3b/ty3 Het
22 384 well plate, with data from one 96 well plate Each well contained leaves from a different plant from F3 families for Sem. Trop.
23 Advantages of SNP170 Does not require agarose gels (P6-25), so is much faster Closer to the true resistance determinant than SCAR marker P6-25; should give fewer false positives No false positives with Mi resistant germplasm Positive calls for Ty1, Ty3, Ty3a, Ty3b Adapted to large scale screening using 384 or 1536 well plates or other platforms
24 Disadvantages of SNP170 Does not distinguish between Ty1, Ty3, Ty3a, or Ty3b Cost of equipment for reading fluorescent dyes, much more than agarose gels
25 Special Thanks East-West Seeds for hosting TBRT Citizens of the USA NSF grant to SGN for sequencing, staff at SGN SolCap grant for SNP genotyping SolCAP SNP platform USDA funds for preparation of DNA CDR/MERC grants for P6-25 and TG97 analysis Ag Biotech Testing KASPar primers and verification of SNP170 Semillas Tropicales Supplying Gh13 and some other lines for testing
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