NCJ Number
246361
Journal
Forensic Science International: Genetics Volume: 7 Issue: 1 Dated: January 2013 Pages: 92-97
Date Published
2013
Length
6 pages
Annotation
This is the report of a project that conducted high throughput analysis of buccal scrape reference samples using the Identifiler system on the Applied Biosystems 3500xl Genetic Analyser.
Abstract
The project determined that this platform is much more sensitive than previous platforms, e.g. 3130xl. The range of signal detection is also much greater, and this means that the system is more tolerant to a wide range of input template concentrations. DNA quantity is not a limiting factor in the analysis of buccal scrapes; hence, the entire analytical procedure was designed around a target input of 1.5 ng, so as to minimize low-level DNA profiles and associated events of allele dropout. A universal stochastic threshold/limit of detection (LOD) of 300 relative fluorescent units (rfu) was applied across all loci. This level is twice that of comparable systems such as SGM Plus analyzed on 3130xl instruments. After analysis of dropout probabilities, heterozygous balance, drop-in and stutter characteristics, rule-sets were programmed into the FSS i-cubed software. The process has a success rate greater than 95 percent. No discordances or misdesignations occurred when applied to a validation set of more than 1,000 samples. 6 figures, 2 tables, and 12 references