A better way to map sequencing reads using existing read mapping tool

steveqin.emory

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Join Date: Oct 2010

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A better way to map sequencing reads using existing read mapping tool

08-17-2015, 06:43 AM

Our group just published a paper on improving sequencing read mapping. We achieved this without inventing a new read alignment tool. The key is to customize the reference genome for each individual since mutation profile on many subjects are known a priori from previous array-based genotyping. Our software tool--RefEditor can work with any existing aligner such as BWA or bowtie.

One Size Doesn't Fit All - RefEditor: Building Personalized Diploid Reference Genome to Improve Read Mapping and Genotype Calling in Next Generation Sequencing Studies

One Size Doesn't Fit All - RefEditor: Building Personalized Diploid Reference Genome to Improve Read Mapping and Genotype Calling in Next Generation Sequencing Studies

http://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1004448

With rapid decline of the sequencing cost, researchers today rush to embrace whole genome sequencing (WGS), or whole exome sequencing (WES) approach as the next powerful tool for relating genetic variants to human diseases and phenotypes. A fundamental step in analyzing WGS and WES data is mapping short sequencing reads back to the reference genome. This is an important issue because incorrectly mapped reads affect the downstream variant discovery, genotype calling and association analysis. Although many read mapping algorithms have been developed, the majority of them uses the universal reference genome and do not take sequence variants into consideration. Given that genetic variants are ubiquitous, it is highly desirable if they can be factored into the read mapping procedure. In this work, we developed a novel strategy that utilizes genotypes obtained a priori to customize the universal haploid reference genome into a personalized diploid reference genome. The new strategy is implemented in a program named RefEditor. When applying RefEditor to real data, we achieved encouraging improvements in read mapping, variant discovery and genotype calling. Compared to standard approaches, RefEditor can significantly increase genotype calling consistency (from 43% to 61% at 4X coverage; from 82% to 92% at 20X coverage) and reduce Mendelian inconsistency across various sequencing depths. Because many WGS and WES studies are conducted on cohorts that have been genotyped using array-based genotyping platforms previously or concurrently, we believe the proposed strategy will be of high value in practice, which can also be applied to the scenario where multiple NGS experiments are conducted on the same cohort. The RefEditor sources are available at https://github.com/superyuan/refeditor.

RefEditor is freely available at

GitHub - superyuan/refeditor: This software package is to improve read mapping accuracy for diploid individuals.

https://github.com/superyuan/refeditor

This software package is to improve read mapping accuracy for diploid individuals. - GitHub - superyuan/refeditor: This software package is to improve read mapping accuracy for diploid individuals.

Steve
Tags: read alignment, read mapping, reference genome

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