Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Developmental validation of the PowerPlex 21 System.

Published

Author(s)

Carolyn R. Steffen, Martin G. Ensenberger, Robert S. McLaren, Cynthia J. Sprecher, Douglas R. Storts

Abstract

The PowerPlex(®) 21 System is a STR multiplex that has been optimized for casework samples while still being capable of database workflows including direct amplification. The loci included in the multiplex offer increasing overlap with core loci used in different countries and regions throughout the world. The PowerPlex(®) 21 System contains D1S1656, D2S1338, D3S1358, D5S818, D6S1043, D7S820, D8S1179, D12S391, D13S317, D16S539, D18S51, D19S433, D21S11, Amelogenin, CSF1PO, FGA, Penta D, Penta E, TH01, TPOX, and vWA. These loci represent all 13 core CODIS loci in addition to loci commonly used in Asia and Europe. A developmental validation study was completed to document performance capabilities and limitations of the PowerPlex(®) 21 System. Data from this validation work served as the basis for the following conclusions: genotyping of single-source samples was reliable across a range of template DNA concentrations with >95% alleles called at 50 pg. Direct amplification of samples from FTA(®) storage cards was successfully performed using the reagents provided with the system and modified cycling protocols provided in the technical manual. Mixture analysis showed that over 95% of minor alleles were detected at 1:9 ratios. Reaction conditions including volume and annealing temperature as well as the concentrations of primers, DNA polymerase, magnesium, and Master Mix were shown to be optimal and able to withstand moderate variations without affecting system performance. Reproducible results were generated by different users at different sites. Finally, concordance studies showed consistent results when comparing the PowerPlex(®) 21 System with other commercially available STR-genotyping systems.
Citation
Forensic Science International: Genetics
Volume
9

Keywords

CODIS, DNA typing, Forensic science, PowerPlex(®), Short tandem repeat (STR), Validation

Citation

Steffen, C. , Ensenberger, M. , McLaren, R. , Sprecher, C. and Storts, D. (2013), Developmental validation of the PowerPlex 21 System., Forensic Science International: Genetics, [online], https://doi.org/10.1016/j.fsigen.2013.12.005 (Accessed May 18, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created December 23, 2013, Updated November 10, 2018