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4 protocols using miseq genetic analyzer

1

Mutational Landscape in Multiple Myeloma

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The mutational status of KRAS, NRAS, and BRAF genes was studied in bone marrow samples of 34 patients. In 16 patients, in addition to bone marrow, mutations in these genes were evaluated in plasma ctDNA. All three localizations (plasma, bone marrow, and plasmacytoma) were studied in three patients. The mutational profile of the KRAS and NRAS genes was studied by Sanger sequencing on the Nanophor 05 genetic analyzer (Institute for Analytical Instrumentation Russian Academy of Science, Russia) and by the NGS on the MiSeq genetic analyzer (Illumina, San Diego, CA, USA). The BRAF V600E mutation was determined by real-time allele-specific PCR with the device CFX96 Touch (Bio-Rad, Hercules, CA, USA).
Statistical analysis was carried out using frequency analysis (using conjugacy tables and the Fisher criterion).
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2

Genome Sequencing of Viral Strains

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The nucleotide sequences of the HA gene fragment were determined using an ABI Prism 3130 automatic sequencer and the BigDye Terminator Cycle Sequencing kit (Applied Biosystems, Waltham, MA, USA) according to the manufacturer’s instructions. Genome-wide sequencing was performed using a MiSeq genetic analyzer (Illumina, Hayward, CA, USA) according to the manufacturer’s instructions (for the resequencing of small genomes). The commercial Nextera XT Library Prep Kit (Illumina, Hayward, CA, USA) and Nextera XT Index Kits (Illumina, Hayward, CA, USA) were used to prepare the libraries. The viral genome was built in GS Reference Mapper v2.7 and GS De Novo Assembler v2.7, and the genome sequencing results were deposited in the GenBank database (Table 1).
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3

Genomic DNA Isolation and Variant Analysis

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Plasma blood samples were collected in Vacutainer tubes. Subsequently, genomic DNA was isolated from whole blood using the QIAsymphony DSP DNA Mini Kit (Qiagen, Germantown, MD, USA) and used to prepare indexed libraries using the Trusight Cancer Panel – Nextera DNA Flex Pre-Enrichment Library Prep (Illumina, San Diego, USA). Libraries were sequenced on a MiSeq genetic analyzer (Illumina, Inc., San Diego, CA), according to the manufacturer’s protocols. Annotation was performed against the human reference genome GRCh38 using VariantStudio V.3 (Illumina, Inc., San Diego, CA). Based on the data generated from this software, alterations were identified as pathogenic when classified as disease causing or as variants of unknown significance (VUS) when evidence regarding their pathogenicity was either conflicting or limited. The validation of results was performed according to criteria of American College of Medical Genetics – ACMG (8 (link)) and National Comprehensive Cancer Network (NCCN) guidelines.
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4

Targeted Cancer Gene Sequencing from Plasma

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Plasma blood samples were collected in Vacutainer tubes. Within 4 hours after collection, plasma was separated from whole blood samples through centrifugation for 10 min at 3000 rpm at room temperature and stored at −80°C until further use. Genomic DNA was extracted from whole blood using the QIAsymphony DSP DNA Mini Kit and used to prepare indexed libraries to target the sequence of 42 cancer predisposing genes using the Trusight Cancer Panel – Nextera DNA Flex Pre-Enrichment Library Prep (Illumina, San Diego, USA) (Supplementary Table 2). Libraries were qualitatively and quantitatively evaluated using a Fragment Analyzer (Advanced Analytical Technologies, Heidelberg, Germany) and sequenced on a MiSeq genetic analyzer (Illumina, Inc., San Diego, CA), according to the manufacturer’s protocols. Annotation was performed against the human reference genome GRCh38 using VariantStudio V.3 (Illumina). The validation of results was performed according to criteria of American College of Medical Genetics – ACMG (12 (link)) and NCCN guidelines.
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