Analysis of the bread wheat genome using whole- genome shotgun sequencing Manuel Spannagl MIPS, Helmholtz Center Munich Analysis of the bread wheat genome.

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Presentation transcript:

Analysis of the bread wheat genome using whole- genome shotgun sequencing Manuel Spannagl MIPS, Helmholtz Center Munich Analysis of the bread wheat genome using whole- genome shotgun sequencing Manuel Spannagl MIPS, Helmholtz Center Munich

Wheat - why bother? ① Many varieties incl. bread wheat, durum („pasta“) wheat… ② Third most-produced cereal with 651 millions tons (2010), cultivated worldwide in different climates ③ Leading source of vegetable protein in human food

The Challenge

Wheat – a WGS approach Aims and Goals

① 5x 454 WGS sequencing => 85 Gb sequence, 220 million reads ② ~79% of reads repeat-related ③ direct Low-copy-number genome assembly (LCG, Newbler) => collapses many homologous gene sequences ④ to prevent collapsing of homologous gene sequences and reduce complexity => orthologous group assembly at high stringency Wheat – a WGS approach

① Use fully sequenced and analysed reference genomes (rice, Brachypodium, sorghum) ② Group genes into families (Orthologous Groups) ③ Use the orthologous group representatives as sequence baits to capture corresponding sequence reads. ④ Do sub-assembly for each „orthologous bin“ seperately WGS assembly using „in silico exon capture“

Bread Wheat Genaology

Ortholome directed assembly circumvents limitations faced by WGS assembly

The ortholome directed assembly delivers ordered segments

The ortholome directed assembly delivers ordered segments II 132

Coverage of Orthologous Group

Gene Copy Retention after Polyploidization - Calibration of the method- Gene Copy Retention after Polyploidization - Calibration of the method- 97%99%100% Maize Hexaploid Rice „TRice“

Gene Copy Retention after Polyploidization

Gene fragments are abundant in wheat

Gene fragments are abundant in the wheat genome

Expanded Wheat Gene Families

Shotguns (Illumina 80x (T.monococcum)) and 454 (3x (Ae.tauschii)) cDNA seq‘s from the Ae. speltoides group (B) Can A and D genome shotgun data be used to dissect the ABD of wheat? The Three Nephews: the A, B and D‘s of wheat

The Three Nephews: Similarity on a Sequence Basis

Wheat A, B and D Assignment using Machine Learning (SVM)

Particular Gene Categories are preferentially retained

Franz Marc „Hocken im Schnee“ Almost full gene complement detected and structured 10000s of pseudogenes detected Separation of A, B and D using machine learning with > 75% accuracy Complementary to chromosome sorting approaches Applicable to polyploids in general to get genome overview Rapid and economic approach to pragmatically cope with limitations in sequence technology Summary

„In Silico Exon Capture“ Statistics

The composition of A, B and D are similar

acknowledgements MIPS Matthias Pfeifer Klaus Mayer All other group members The UK Wheat Consortium Mike Bevan Neil Hall Anthony Hall Keith Edwards Rachel Brenchley CSHL Dick McCombie UC Davis & USDA Albany Jan Dvorak Mincheng Luo Olin Anderson Kansas State University Bikram Gill Sunish Segal EBI Paul Kersey Dan Bolser