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    Description

    Organellar DNA sequences are widely used in evolutionary and population genetic studies; however, the conservative nature of chloroplast gene and genome evolution often limits phylogenetic resolution and statistical power. To gain maximal access to the historical record contained within chloroplast genomes, we have adapted multiplex sequencing-by-synthesis (MSBS) to simultaneously sequence multiple genomes using the Illumina Genome Analyzer. We PCR-amplified ~120kb plastomes from eight species (seven Pinus, one Picea) in 35 reactions. Pooled products were ligated to modified adapters that included 3 bp indexing tags, and samples were multiplexed at four genomes per lane. Tagged microreads were assembled by de novo and reference-guided assembly methods, using previously published Pinus plastomes as surrogate references. Assemblies for these eight genomes are estimated at 88 to 94 percent complete, with an average sequence depth of 55x to 186x. Mononucleotide repeats interrupt contig assembly with increasing repeat length, and we estimate that the limit for their assembly is 16 bp. Comparisons to 37 kb of Sanger sequence show a validated error rate of 0.056 percent, and conspicuous errors are evident from the assembly process. This efficient sequencing approach yields high-quality draft genomes and should have immediate applicability to genomes with comparable complexity.

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    Citation

    Cronn, Richard; Liston, Aaron; Parks, Matthew; Gernandt, David S.; Shen, Rongkun; Mockler, Todd. 2008. Multiplex sequencing of plant chloroplast genomes using Solexa sequencing-by-synthesis technology. Nucleic Acids Research. 1-11

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    Keywords

    Genetics, DNA sequences, multiplex sequencing-by-synthesis

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https://www.fs.usda.gov/treesearch/pubs/33215