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The IWGSC: Building the sequence-based foundation for accelerated wheat breeding Kellye A. Eversole IWGSC Executive Director & The IWGSC Cereals for Food,

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Presentation on theme: "The IWGSC: Building the sequence-based foundation for accelerated wheat breeding Kellye A. Eversole IWGSC Executive Director & The IWGSC Cereals for Food,"— Presentation transcript:

1 The IWGSC: Building the sequence-based foundation for accelerated wheat breeding Kellye A. Eversole IWGSC Executive Director & The IWGSC Cereals for Food, Feed and Fuel – Challenge for Global Improvement 4 July 2014

2 Why Lay a foundation to accelerate wheat improvement Increase profitability throughout the industry Vision High quality annotated genome sequence, comparable to rice genome sequence Physical map-based, integrated and ordered sequence

3 A sequence for whom & for what purposes Feuillet et al, TIPS, 2010

4  Chromosomes: 605 - 995 Mbp (3.6 – 5.9% of the genome) Dissection of the genome into single chromosomes (arms) Triticum aestivum (2n = 6x = 42) 1C ~ 17,000 Mbp AABB DD  Chromosome arms: 225 - 585 Mbp (1.3 – 3.4% of the genome) D B ; A Doležel et al., Chromosome Res. 15: 51, 2007 Managing the 17 Gb, Hexaploid Genome Chromosome genomics  Chromosome specific BAC libraries and sequencing IEB

5 MTP sequencing A reference sequence anchored to the genetic and phenotypic maps Long term Physical mapping of individual chromosomes Short term Gene catalog Virtual order Markers Survey sequencing of individual chromosomes Roadmap to the Wheat Genome Sequence

6 Physical maps Pseudo- molecules Current status of individual projects

7 IWGSC Chromosome Shotgun Sequencing Initiative Amplified DNA- sorted individual chromosomes ~50X Illumina sequence >30X Illumina sequence Chromosome arm sequence assemblies Gene modeling, virtual ordering (GZ), annotation, functional, structural analyses Composition and Evolution of the 21 Bread Wheat Chromosomes A, S, D, & AB genomes (7) Read/assembly alignment to chromosome arms

8 Sequence assemblies for 40 chromosome arms + chromosome 3B  Total length 10.2 Gb  128Mb (1DS) – 639Mb (3B) assembled sequence per chromosome  N50 contig length after repeat masking = 6.1kb (1.7kb-8.9kb) Annotation ( RNASeq, FLcDNA, grass genomes ): 124,201 allocated to chromosomes IWGSC Chromosome Survey Sequence Data

9 Summary IWGSC Chromosome Survey Sequencing - Summary Almost full wheat gene complement identified and allocated to chromosome arms On average, 53% of genes virtually ordered along chromosomes High level of inter- and intrachromosomal duplication Over 3.5 M markers mapped to contigs (1.3M wheat markers + 2.3M SNPs) - SSR, EST, DArT, SNP (90k) markers... 13.2 million SNPs from POPSeq aligned to contigs

10 High density SNP chips New phylogenetic analyses of wheat genome evolution Homoeologue-specific gene expression analyses Wheat haplotype map TILLING projects in T. durum and bread wheat IWGSC CSS Resources are Facilitating

11 Power of A High Quality Reference Sequence Feuillet et al, Trends in Plant Sciences, 2010; Rey et al, unpublished update) Number of QTLs Cloned Rice Wheat

12 3B Reference is facilitating map-based cloning  Disease resistance genes (Sr, Lr, Yr, Stb…)  Solid stem (saw fly)  Yield  Drought tolerance  Boron transporter  Flowering time  NUE  Chromosome pairing… 40 genes and QTL mapped on 3B  4722 markers on 3B consensus map, 3102 in 964 SC (679 Mb =82 % of the sequence)  13 map-based cloning projects

13 CS WGS 5x (2012) A and D genome related ancestors (2013) CS chromosome survey sequences (2013) CS 3BSEQ (2013) completeness of information 94% real order Wheat Sequences Available Now Gold standard Max 53% using synteny and genetic mapping (GZ): « virtual order » Whole Genome Shotgun Whole Chromosome Shotgun Chromosome MTP

14 IWGSC Projects The Annotated Reference Sequence of the Bread Wheat Genome Pseudomolecules (1 of 21 completed) Chromosome Shotgun Sequences and marker alignment (completed) Physical Maps with markers (13 of 21 completed)

15 Summary IWGSC Resources All resources accessible at URGI, Versailles IWGSC CSS Raw sequence reads in the SRA IWGSC CSS assemblies available at URGI and EBI IWGSC CSS assemblies & gene models integrated into EnsemblPlants http://wheat-urgi.versailles.inra.fr/Seq-Repository/ http://plants.ensembl.org/Triticum_aestivum

16 Acknowledgements Co-chairs R. Appels J. Dvorak C. Feuillet B. Gill B. Keller Y. Ogihara Sponsors (22) Coordinating Committee (64)

17 Thank you for your attention! www.wheatgenome.org @wheatgenome

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