Nov 7, 2018

BELLA: Berkeley Efficient Long-Read to Long-Read Aligner and Overlapper

BioRxiv : the Preprint Server for Biology
Giulia GuidiAyd?n Buluç


Recent advances in long-read sequencing enable the characterization of genome structure and its intra- and inter-species variation at a resolution that was previously impossible. Detecting overlaps between reads is integral to many long-read genomics pipelines, such as de novo genome assembly. While longer reads simplify genome assembly and improve the contiguity of the reconstruction, current long-read technologies come with high error rates. We present Berkeley Long-Read to Long-Read Aligner and Overlapper (BELLA), a novel algorithm for computing overlaps and alignments via sparse matrix-matrix multiplication that balances the goals of recall and precision, performing well on both. We present a probabilistic model that demonstrates the feasibility of using short k-mers for detecting candidate overlaps. We then introduce a notion of reliable k-mers based on our probabilistic model. Combining reliable k-mers with our binning mechanism eliminates both the k-mer set explosion that would otherwise occur with highly erroneous reads and the spurious overlaps from k-mers originating in repetitive regions. Finally, we present a new method based on Chernoff bounds for separating true overlaps from false positives using a combination of...Continue Reading

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Mentioned in this Paper

Severe Acute Respiratory Syndrome
Repetitive Region
Genome Assembly Sequence
probe gene fragment
Drops - Drug Form
Calcaneal Apophysitis
Multilevel Analysis
HAL-2 protein, C elegans

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