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Haplotype mapping with S ingle F eature P olymorphisms in Arabidopsis Justin Borevitz Ecology & Evolution University of Chicago http://naturalvariation.org. Talk Outline. Natural Variation in Light Response Single Feature Polymorphisms (SFPs) Potential deletions Haplotype analysis

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Talk Outline

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  1. Haplotype mapping withSingle Feature Polymorphismsin Arabidopsis Justin BorevitzEcology & EvolutionUniversity of Chicagohttp://naturalvariation.org

  2. Talk Outline • Natural Variation in Light Response • Single Feature Polymorphisms (SFPs) • Potential deletions • Haplotype analysis • Patterns in gene Families • Aquilegia • Natural Variation in Light Response • Single Feature Polymorphisms (SFPs) • Potential deletions • Haplotype analysis • Patterns in gene Families • Aquilegia

  3. Light Affects the Entire Plant Life Cycle Light response variation can be seen under constant conditions in the lab Natural Variation under selection? Test in field

  4. Seasons in the Growth Chamber • Changing Day length • Cycle Light Intensity • Cycle Light Colors • Cycle Temperature

  5. Which arrays should be used? • Spotted arrays Arizona 29,000 - 70mers • ATH1, Affymetrix expression GeneChip 202,806 unique 25bp oligo nucleotides features • AtTILE1, universal whole genome array every ~35bp, > 3Million PM features • Re-sequencing array 120M*8bp • 20 Accessions, Perlegen, • Max Planck (Weigel), USC (Nordborg) GeneChip

  6. Universal Whole Genome Array RNA DNA Chromatin Immunoprecipitation ChIP chip Gene Discovery Gene model correction Non-coding/ micro-RNA Antisense transcription Methylation Transcriptome Atlas Expression levels Tissues specificity Polymorphism SFPs Discovery/Genotyping Comparative Genome Hybridization (CGH) Insertion/Deletions Alternative Splicing ~35 bp tile, non-repetitive regions, “good” binding oligos, evenly spaced

  7. ChipViewer: Mapping of transcriptional units of ORFeome From 2000v At1g09750 (MIPS) to the latest AGI At1g09750 2000 v Annotation (MIPS) The latest AGI Annotation

  8. Improved Genome Annotation ORFa Transcriptome Atlas ORFb start AAAAA deletion M M M M M M M M M M M M SFP SNP SNP SFP SFP conservation Chromosome (bp)

  9. Potential Deletions

  10. False Discovery and Sensitivity • Cereon • may be a • sequencing • Error • TIGR • match is • a match 90% 80% 70% 41% 53% 85% 90% 80% 70% 67% 85% 100% 3/4 Cvi markers were also confirmed in PHYB PM only GeneChip SAM threshold SFPs nonSFPs Cereon marker accuracy 5% FDR 3806 89118 100% Sequence 817 121 696 Sensitivity Polymorphic 340 117 223 34% Non - polymorphic 477 4 473 False Discovery rate: 3% Test for independence of all factors: Chisq = 177.34, df = 1, p - value = 1.845e - 40 GeneChip SAM threshold SFPs nonSFPs Cereon marker accuracy 18% FDR 10627 82297 100% Sequence 817 223 594 Sensitivity Polymorphic 340 195 145 57% Non - polymorphic 477 28 449 False Discovery rate: 13% Test for indep endence of all factors: Chisq = 265.13, df = 1, p - value = 1.309e - 59

  11. Chip genotyping of a Recombinant Inbred Line 29kb interval Discovery 6 replicates X $500 12,000 SFPs = $0.25 Typing 1 replicate X $500 12,000 SFPs = $0.041

  12. 100 bibb mutant plants Map bibb 100 wt mutant plants

  13. bibb mapping Bulk segregant Mapping using Chip hybridization bibb maps to Chromosome2 near ASYMETRIC LEAVES1 AS1 ChipMap

  14. BIBB = ASYMETRIC LEAVES1 AS1 (ASYMMETRIC LEAVES1) = MYB closely related to PHANTASTICA located at 64cM as1 bibb Sequenced AS1 coding region from bib-1 …found g -> a change that would introduce a stop codon in the MYB domain bib-1 W49* as-101 Q107* bibb as1-101 MYB

  15. Array Mapping chr1 chr2 chr3 chr4 chr5 Hazen et al Plant Physiology (submitted)

  16. eXtreme Array Mapping 15 tallest RILs pooled vs 15 shortest RILs pooled

  17. Chromosome 2 16 12 RED2 QTL LOD 8 4 0 0 20 40 60 80 100 cM RED2 QTL 12cM Composite Interval Mapping eXtreme Array Mapping LOD Allele frequencies determined by SFP genotyping. Thresholds set by simulations Red light QTL RED2 from 100 Kas/ Col RILs (Wolyn et al Genetics 2004)

  18. eXtreme Array Mapping BurC F2

  19. QTLLz x Ler F2 XAMLz x Col F2 (Werner et al Genetics in press)

  20. eXtreme Array Fine Mapping ~2Mb ~8cM Col Low RED2 QTL >400 SFPs High Kas X mark2 mark1 ~2 ~268 ~43 Kas Col Col Col het Col ~43 ~43 ~539 ~539 Kas het Col het het het het het ~268 ~2 ~43 Kas Kas Kas Kas Col het Select recombinants by PCR >200 from >1250 plants

  21. Potential Deletions >500 potential deletions 45 confirmed by Ler sequence 23 (of 114) transposons Disease Resistance (R) gene clusters Single R gene deletions Genes involved in Secondary metabolism Unknown genes

  22. FLM natural deletion Potential Deletions Suggest Candidate Genes FLOWERING1 QTL Chr1 (bp) MAF1 Flowering Time QTL caused by a natural deletion in FLM (Werner et al PNAS 2005)

  23. Het Fast Neutron deletions FKF1 80kb deletion CHR1 cry2 10kb deletion CHR1

  24. Array Haplotyping • What about Diversity/selection across the genome? • A genome wide estimate of population genetics parameters, θw, π, Tajima’D, ρ • LD decay, Haplotype block size • Deep population structure? • Col, Lz, Bur, Ler, Bay, Shah, Cvi, Kas, C24, Est, Kin, Mt, Nd, Sorbo, Van, Ws2 Fl-1, Ita-0, Mr-0, St-0, Sah-0

  25. Chromosome1 ~500kb Col Ler Cvi Kas Bay Shah Lz Nd Array Haplotyping Inbred lines Low effective recombination due to partial selfing Extensive LD blocks

  26. Distribution of T-stats 208,729 null (permutation) actual 32,427 Calls Not Col NA Col NA duplications 12,250 SFPs

  27. Sequence confirmation of SFPs

  28. SFPs for reverse genetics 14 Accessions 30,950 SFPs` http://naturalvariation.org/sfp

  29. Chromosome Wide Diversity

  30. Diversity 50kb windows

  31. Tajima’s D like 50kb windows RPS4 unknown

  32. RPS4 R genes vs bHLH Theta W

  33. RPS4 Rgenes vs bHLH Tajimas’ D

  34. R genes vs bHLH

  35. Review • Single Feature Polymorphisms (SFPs) can be used to • Identify recombination breakpoints • eXtreme Array Mapping • Potential deletions (candidate genes) • Haplotyping • Diversity/Selection • Association Mapping

  36. Aquilegia (Columbines) Recent adaptive radiation, 350Mb genome

  37. Plant lineage: crop plant coverage > 20k dbEST 11/14/2003 Animal lineage: good coverage

  38. NSF Genome Complexity • 45,000 ESTs 5’ and 3’ ends • 350 arrays, RNA and genotyping • High density SFP Genetic Map • Physical Map (BAC tiling path) • Physical assignment of ESTs • QTL for pollinator preference • ~400 RILs, map abiotic stress • QTL fine mapping/ LD mapping • Develop transformation techniques Scott Hodges (UCSB) Elena Kramer (Harvard) Magnus Nordborg (USC) Justin Borevitz (U Chicago) Jeff Tompkins (Clemson)

  39. NaturalVariation.org NaturalVariation.org Salk Jon Werner Joanne Chory Joseph Ecker Max Planck Detlef Weigel UC San Diego Charles Berry Scripps Sam Hazen Elizabeth Winzeler Salk Jon Werner Joanne Chory Joseph Ecker Max Planck Detlef Weigel UC San Diego Charles Berry Scripps Sam Hazen Elizabeth Winzeler University of Chicago Xu Zhang Evadne Smith UC Davis Julin Maloof University of Guelph, Canada Dave Wolyn Sainsbury Laboratory Jonathan Jones University of Chicago Xu Zhang Evadne Smith UC Davis Julin Maloof University of Guelph, Canada Dave Wolyn Sainsbury Laboratory Jonathan Jones

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