Review Article

Challenges of Identifying Clinically Actionable Genetic Variants for Precision Medicine

Table 2

Comparison of sequencing instruments.

CharacteristicMiSeqPacBio RS IIIon S5HiSeq 4000454 GS FLX Titanium XL+SOLiD
5500xl W
Sanger Genetic Analyzer 3500xL

Instrument price~125 K~695 K~65 K~900 K~500 K~595 K~173 K

Sequencing mechanismSequencing-by-synthesisSingle-molecule, real-time sequencingSemiconductor sequencingSequencing-by-synthesisPyrosequencingOligonucleotide
ligation
Dideoxynucleotide chain termination

Sequencing applicationTargetedTargeted; transcriptome profilingTargeted; whole exome; transcriptome profiling Whole exome/genome; transcriptome profilingWhole exome/genome; transcriptome profilingWhole exome/genome; transcriptome profilingNext-generation sequencing validation, targeted sequencing of mutations or small insertions/deletions

Maximum read length300 bp PE10,000 bp200 bp150 bp PE700 bp75 bp SE, 50 bp mate-paired850 bp

Reads per run15 million55–900 K60–80 million2.5–5 billion~1 million100 million–4.8 billionNot applicable

Output data per run0.5–15 Gb0.5–16 Gb~44 Gb125–1500 Gb~0.7 Gb160–320 Gb2–100 Kb

Run time4–55 hours6 hours1-2 days<1–3.5 days23 hours2–7 days0.5–3 hours

AdvantagesLow error rate; short run timeLong read length; short run timeShort run time; low start-up costLow error rate; high throughputLong read lengthLow error rateLow error rate; long read length

DisadvantagesHigher cost per base compared to HiSeq instrumentsMedium/high cost per baseHigh error rate for homopolymer tracts and insertions/deletionsShort read lengthHigh error rate for homopolymer tractsShort read length; long run timeHigh cost per base; low throughput

bp, base pairs; Gb, gigabases; K, thousand; Kb, kilobases; PE, paired-end; SE, single-end.