ILLUMINA, INC. 20005715 NextSeq 550Dx Sequencing System

The Illumina NextSeq 550Dx instrument is intended for sequencing DNA libraries prepared by adding sample indices and capture sequences to amplified targets. These libraries are captured on a flow cell and sequenced on the instrument using sequencing by synthesis (SBS) chemistry. SBS chemistry uses a reversible-terminator method to detect single nucleotide bases incorporated into growing DNA strands. Instrument software performs image analysis and base calling, assigning a quality score to each base for each sequencing cycle. When primary analysis finishes, secondary analysis processes base calls on the instrument. The NextSeq 550Dx instrument uses different secondary analysis modules depending on the workflow. For the germline or somatic variant calling modules, data processing includes de-multiplexing, FASTQ file generation, alignment, variant calling, and generation of variant call format (VCF) files containing information regarding variants found at specific positions in a reference genome.