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Author(s): Ranade, Swati and Alkan, Can and Antonacci, Francesca and Klammer, Aaron and Hon, Lawrence and Schadt, Eric and Eichler, Evan

Assessment of genome-wide variation revealed regions of the genome with complex, structurally diverse haplotypes that are insufficiently represented in the human reference genome. The 17q21.31 region is one of the most dynamic and complex regions of the human genome. Different haplotypes exist, in direct and inverted orientation, showing evidence of positive selection and predisposing to microdeletion associated with mental retardation. Sequencing of different haplotypes is extremely important to characterize the spectrum of structural variation at this locus. However, de novo assembly with second-generation sequencing reads is still problematic. Using PacBio technology we have sequenced and de novo assembled a tiling path of eight BAC clones (~1.6 Mb region) across this medically relevant region from the library of a hydatidiform mole. Complete hydatidiform moles arise from the fertilization of an enucleated egg from a single sperm and therefore carry a haploid complement of the human genome, eliminating allelic variation that may confound mapping and assembly. The PacBio RS system enables single molecule real time sequencing, featuring long reads and fast turnaround times. With deep sequencing, PacBio reads were able to generate a very uniform sequencing coverage with close to 100% coverage of most of the target interval regions covered. Due to long read lengths, the PacBio RS data could be accurately assembled.

Organization: PacBio
Year: 2012

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