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Statistical Binning for Barcoded Reads Improves Downstream Analyses
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DOI：10.1016/j.cels.2018.07.005.png)
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摘要
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Sequencing technologies are capturing longer-range genomic information at lower error rates, enabling alignment to genomic regions that are inaccessible with short reads. However, many methods are unable to align reads to much of the genome, recognized as important in disease, and thus report erroneous results in downstream analyses. We introduce EMA, a novel two-tiered statistical binning model for bar-coded read alignment, that first probabilistically maps reads to potentially multiple read clouds'' and then within clouds by newly exploiting the non-uniform read densities characteristic of barcoded read sequencing. EMA substantially improves downstream accuracy over existing methods, including phasing and genotyping on 10x data, with fewer false variant calls in nearly half the time. EMA effectively resolves particularly challenging alignments in genomic regions that contain nearby homologous elements, uncovering variants in the pharmacogenomically important CYP2D region, and clinically important genes C4 (schizophrenia) and AMY1A (obesity), which go undetected by existing methods. Our work provides a framework for future generation sequencing.
Keyword:
DNA-SEQUENCING DATA
HUMAN GENOME
GENERATION
TECHNOLOGIES
FRAMEWORK
ALIGNMENT
VARIANT
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