Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/75866
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Type: Journal article
Title: Transcriptome-scale homoeolog-specific transcript assemblies of bread wheat
Author: Schreiber, A.
Hayden, M.
Forrest, K.
Kong, S.
Langridge, P.
Baumann, U.
Citation: BMC Genomics, 2012; 13(1):1-14
Publisher: BioMed Central Ltd.
Issue Date: 2012
ISSN: 1471-2164
1471-2164
Statement of
Responsibility: 
Andreas W Schreiber, Matthew J Hayden, Kerrie L Forrest, Stephan L Kong, Peter Langridge and Ute Baumann
Abstract: Background: Bread wheat is one of the world’s most important food crops and considerable efforts have been made to develop genomic resources for this species. This includes an on-going project by the International Wheat Genome Sequencing Consortium to assemble its large and complex genome, which is hexaploid and contains three closely related ‘homoeologous’ copies for each chromosome. This multi-national effort avoids the complications polyploidy entails for correct assembly of the genome by sequencing flow-sorted chromosome arms one at a time. Here we report on an alternate approach, a direct homoeolog-specific assembly of the expressed portion of the genome, the transcriptome. Results: After assessment of the ability of various assemblers to generate homoeolog-specific assemblies, we employed a two-stage assembly process to produce a high-quality assembly of the transcriptome of hexaploid wheat from Roche-454 and Illumina GAIIx paired-end sequence reads. The assembly process made use of a rapid partitioning of expressed sequences into homoeologous clusters, followed by a parallel high-fidelity assembly of each cluster on a 1150-processor compute cloud. We assessed assembly quality through comparison to known wheat gene sequences and found that in ca. 98.5% of cases the assembly was sufficiently accurate for homoeologous triplets to be cleanly separated into either two or three separate contigs. Comparison to publicly available transcript collections suggests that the assembly covers ~75-80% of the complete transcriptome. Conclusions: This work therefore describes the first homoeolog-specific sequence assembly of the wheat transcriptome and provides a reference transcriptome for future wheat research. Furthermore, our assembly methodology is transferable to other polyploid organisms.
Keywords: Wheat transcriptome
Wheat genes
Sequence assembly
Cloud computing
Description: Extent: 14p. The electronic version of this article is the complete one and can be found online at: http://www.biomedcentral.com/1471-2164/13/492
Rights: © 2012 Schreiber et al.; licensee BioMed Central Ltd.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
DOI: 10.1186/1471-2164-13-492
Appears in Collections:Agriculture, Food and Wine publications
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