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      •   BUIR Home
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      • Bilkent Theses
      • Theses - Department of Computer Engineering
      • Dept. of Computer Engineering - Master's degree
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      Polishing copy number variant calls on exome sequencing data VIA deep learning

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      Author(s)
      Özden, Furkan
      Advisor
      Çiçek, A. Ercüment
      Date
      2021-07
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      Accurate and efficient detection of copy number variants (CNVs) is of critical importance due to their significant association with complex genetic diseases. Although algorithms that use whole genome sequencing (WGS) data provide sta-ble results with mostly-valid statistical assumptions, copy number detection on whole exome sequencing (WES) data shows comparatively lower accuracy. This is unfortunate as WES data is cost efficient, compact and is relatively ubiquitous. The bottleneck is primarily due to non-contiguous nature of the targeted capture: biases in targeted genomic hybridization, GC content, targeting probes, and sam-ple batching during sequencing. Here, we present a novel deep learning model, DECoNT, which uses the matched WES and WGS data and learns to correct the copy number variations reported by any off-the-shelf WES-based germline CNV caller. We train DECoNT on the 1000 Genomes Project data, and we show that we can efficiently triple the duplication call precision and double the deletion call precision of the state-of-the-art algorithms. We also show that our model con-sistently improves the performance independent from (i) sequencing technology,(ii) exome capture kit and (iii) CNV caller. Using DECoNT as a universal exome CNV call polisher has the potential to improve the reliability of germline CNV detection on WES data sets.
      Keywords
      Copy number variation
      Whole exome sequencing
      Deep learning
      Permalink
      http://hdl.handle.net/11693/76442
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      • Dept. of Computer Engineering - Master's degree 566
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