Evaluation of the Precision ID Identity Panel for the Ion Torrent PGM sequencer.

In cases where only a partial or incomplete STR profile is obtained from a sample, information contained in single nucleotide polymorphisms (SNPs) can prove informative for human identification. Thermo Fisher Scientific, which developed the high throughput Ion Torrent PGM sequencer, released the Precision ID Identity Panel, a multiplex SNP panel for human identity. We evaluated the reproducibility and sensitivity of this multiplex, which contains primers for the amplification of 90 autosomal SNPs and 34 Y-clade SNPs. The manufacturer's protocol was tested using five commercially available pure native DNAs and six forensic type samples at a range of DNA input amounts (0.2-1.0ng; n, 90). In addition to analyzing the data using the manufacturer's software, HID SNP Genotyper (v4.3.1), we also used CLC Genomics Workbench (Qiagen). Although library yields and templating of ion sphere particles (ISPs) were low, downstream sequencing was still successful. Across all samples, only 1.5% of all possible quality control (QC) flags were raised by both the plugin QC filter and CLC; 85% of those flags were raised as the SNP had a major allele frequency outside the thresholds specified by the manufacturer. For the remaining SNPs, coverage of >1500 X and >780 X was obtained for autosomal and Y-clade SNPs respectively, and 100% congruence among genotype calls from both analysis programs was observed. Our results demonstrate that it is possible to obtain reliable and reproducible genotypes using the Precision ID Identity Panel, when using low quantities (≥0.2ng) of either pure native DNA or forensic type DNA samples.