Genes & Genomics

, Volume 40, Issue 1, pp 39–47 | Cite as

An efficient and tunable parameter to improve variant calling for whole genome and exome sequencing data

  • Yong Ju Ahn
  • Kesavan Markkandan
  • In-Pyo Baek
  • Seyoung Mun
  • Wooseok Lee
  • Heui-Soo Kim
  • Kyudong Han
Research Article


Next generation sequencing (NGS) has traditionally been performed in various fields including agricultural to clinical and there are so many sequencing platforms available in order to obtain accurate and consistent results. However, these platforms showed amplification bias when facilitating variant calls in personal genomes. Here, we sequenced whole genomes and whole exomes from ten Korean individuals using Illumina and Ion Proton, respectively to find the vulnerability and accuracy of NGS platform in the GC rich/poor area. Overall, a total of 1013 Gb reads from Illumina and ~39.1 Gb reads from Ion Proton were analyzed using BWA-GATK variant calling pipeline. Furthermore, conjunction with the VQSR tool and detailed filtering strategies, we achieved high-quality variants. Finally, each of the ten variants from Illumina only, Ion Proton only, and intersection was selected for Sanger validation. The validation results revealed that Illumina platform showed higher accuracy than Ion Proton. The described filtering methods are advantageous for large population-based whole genome studies designed to identify common and rare variations associated with complex diseases.


Whole genome sequencing Whole exome sequencing Illumina Ion Proton Variant calling 


Compliance with ethical standards

Conflict of interest

Young Ju Ahn declares that he has no conflict of interest. Kesavan Markkandan declares that he has no conflict of interest. In-Pyo Baek declares that he has no conflict of interest. Seyoung Mun declares that he has no conflict of interest. Wooseok Lee declares that he has no conflict of interest. Heui-Soo Kim declares that he has no conflict of interest. Kyudong Han declares that he has no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Supplementary material

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Supplementary material 1 (VCF 26222 KB)
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Supplementary material 3 (TSV 690 KB)
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Supplementary material 4 (XLSX 16 KB)


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Copyright information

© The Genetics Society of Korea and Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative MedicineDankook UniversityCheonanRepublic of Korea
  2. 2.Theragen Etex Inc.SuwonRepublic of Korea
  3. 3.DKU-Theragen Institute for NGS analysis (DTiNa)CheonanRepublic of Korea
  4. 4.Department of Biological Sciences, College of Natural SciencesPusan National UniversityBusanRepublic of Korea

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