Principles and Recommendations for Standardizing the Use of the Next-Generation Sequencing Variant File in Clinical Settings  Ira M. Lubin, Nazneen Aziz,

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Principles and Recommendations for Standardizing the Use of the Next-Generation Sequencing Variant File in Clinical Settings  Ira M. Lubin, Nazneen Aziz, Lawrence J. Babb, Dennis Ballinger, Himani Bisht, Deanna M. Church, Shaun Cordes, Karen Eilbeck, Fiona Hyland, Lisa Kalman, Melissa Landrum, Edward R. Lockhart, Donna Maglott, Gabor Marth, John D. Pfeifer, Heidi L. Rehm, Somak Roy, Zivana Tezak, Rebecca Truty, Mollie Ullman-Cullere, Karl V. Voelkerding, Elizabeth A. Worthey, Alexander W. Zaranek, Justin M. Zook  The Journal of Molecular Diagnostics  Volume 19, Issue 3, Pages 417-426 (May 2017) DOI: 10.1016/j.jmoldx.2016.12.001 Copyright © 2017 American Society for Investigative Pathology and the Association for Molecular Pathology Terms and Conditions

Figure 1 Next-generation sequencing workflow and associated data files (designated with a dashed-line box). Machine sequencing of the patient sample produces a large number of short reads deposited in a file with associated quality scores (eg, FASTQ). These reads are aligned to a reference assembly or sequence and the results are deposited in an alignment file (eg, BAM). Variants are called and their properties relevant to the sequence (eg, type of variant) are annotated and deposited in the variant file [eg, variant call format (VCF)]. The data in the variant file are further analyzed to determine what findings are clinically relevant and reportable to the physician to inform medical decision making. The Journal of Molecular Diagnostics 2017 19, 417-426DOI: (10.1016/j.jmoldx.2016.12.001) Copyright © 2017 American Society for Investigative Pathology and the Association for Molecular Pathology Terms and Conditions

Figure 2 Variant representation in three common variant file specifications. A: The two variants are listed from sample NA12878 from the 1000Genomes database. Variant 1 is a deletion of A, and variant 2 is a substitution of A to G. The dbSNP identifiers, chromosome number, nucleotide change, and the predicted effect are shown. The Human Genome Variation Society nomenclature for the change is shown relative to the genomic DNA, the mRNA, and protein RefSeq sequences. B: Contrast the differences among the variant file specifications for each of the two variants. The genome variant call format (gVCF) includes the invariant regions, not typically reported by the VCF. The genome variation format (GVF) includes additional annotation of the effect of the variant on the reference annotated features. SNV, single-nucleotide variants. The Journal of Molecular Diagnostics 2017 19, 417-426DOI: (10.1016/j.jmoldx.2016.12.001) Copyright © 2017 American Society for Investigative Pathology and the Association for Molecular Pathology Terms and Conditions

Figure 3 Origin of genomic coordinates. Genomic coordinates of sequence contained within the variant file are made in reference to a genomic build/reference and assigned based on a 5′ to 3′ numbering of the positive strand. Genomic coordinates can change during major updates to the reference assembly, as illustrated in comparing GRCh37 to GRCh38. The Journal of Molecular Diagnostics 2017 19, 417-426DOI: (10.1016/j.jmoldx.2016.12.001) Copyright © 2017 American Society for Investigative Pathology and the Association for Molecular Pathology Terms and Conditions

Figure 4 Phasing data are required to establish the cis or trans relationship of two nonadjacent variants (bold and underlined). A: The true diplotype describing an individual having one allele with two nonadjacent variants that are not found in the same allele of the homologous chromosome. B: Output from a variant caller. C: Interpretation of the output of the variant caller. In the presence of phasing data, the correct haplotypes are established. In the absence of phasing data, the cis or trans association of the two variants cannot be distinguished. The Journal of Molecular Diagnostics 2017 19, 417-426DOI: (10.1016/j.jmoldx.2016.12.001) Copyright © 2017 American Society for Investigative Pathology and the Association for Molecular Pathology Terms and Conditions