alexa An efficient procedure for plant organellar genome assembly, based on whole genome data from the 454 GS FLX sequencing platform.
Bioinformatics & Systems Biology

Bioinformatics & Systems Biology

Journal of Next Generation Sequencing & Applications

Author(s): Zhang T, Zhang X, Hu S, Yu J

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Abstract MOTIVATION: Complete organellar genome sequences (chloroplasts and mitochondria) provide valuable resources and information for studying plant molecular ecology and evolution. As high-throughput sequencing technology advances, it becomes the norm that a shotgun approach is used to obtain complete genome sequences. Therefore, to assemble organellar sequences from the whole genome, shotgun reads are inevitable. However, associated techniques are often cumbersome, time-consuming, and difficult, because true organellar DNA is difficult to separate efficiently from nuclear copies, which have been transferred to the nucleus through the course of evolution. RESULTS: We report a new, rapid procedure for plant chloroplast and mitochondrial genome sequencing and assembly using the Roche/454 GS FLX platform. Plant cells can contain multiple copies of the organellar genomes, and there is a significant correlation between the depth of sequence reads in contigs and the number of copies of the genome. Without isolating organellar DNA from the mixture of nuclear and organellar DNA for sequencing, we retrospectively extracted assembled contigs of either chloroplast or mitochondrial sequences from the whole genome shotgun data. Moreover, the contig connection graph property of Newbler (a platform-specific sequence assembler) ensures an efficient final assembly. Using this procedure, we assembled both chloroplast and mitochondrial genomes of a resurrection plant, Boea hygrometrica, with high fidelity. We also present information and a minimal sequence dataset as a reference for the assembly of other plant organellar genomes.
This article was published in Plant Methods and referenced in Journal of Next Generation Sequencing & Applications

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