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NCJRS Abstract

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  NCJ Number: NCJ 236434   Add to Shopping cart   Find in a Library
  Title: Rapid STR Prescreening of Forensic Samples at the Crime Scene
  Document URL: PDF 
  Author(s): Micah Halpern ; Dr. John Gerdes ; Dr. Joan Habb ; Anahita Kiavand ; Dr. Jack Ballantyne ; Dr. Erin Hanson
  Date Published: 2011
  Page Count: 93
  Annotation: This project’s goals were to continue development of a unique melt-based approach to STR (Short Tandem Repeat) genotyping (dpFRET); to integrate and test that approach for compatibility with existing microfluidic extraction, amplification, and melt subcircuits; and to determine applicability for forensic applications.
  Abstract: The overall objective achieved by this project was the overcoming of difficulties associated with capillary- electrophoresis (CE)-based STR profiles that act as a barrier to rapid objective prescreening of probative samples at the crime scene. The achievement of project goals resulted in the simplification of converting laboratory protocols for portability, mainly by eliminating the many challenges associated with capillary electrophoresis (CE) size-based analysis. These challenges include biological/technological artifacts, added sample processing steps, and complex equipment demands required for portability. This project’s validation phase demonstrated some of the advantages impossible with CE-based protocols. These advantages include higher sensitivity (5-25 picograms); elimination of pre-quantification; minimal or no apparent biological artifacts; applicability to smaller amplicons impossible with current assays; the ability to detect microvariants (SNPs); and transfer compatibility to a microfluidic platform. Through development and testing of the optimized assay with a microfluidic platform, the project achieved sample extraction from blood, PCR amplification, and melt-based allele detection, using a microfluidic-based subcircuit design. It is the transfer of this approach to a fully integrated microfluidic lab-on-a-card format that will permit processing and analysis of samples in an enclosed environment, thereby minimizing the chances for cross-contamination and providing a means for post-analysis archiving of DNA extracts for follow-on laboratory testing of probative samples. The project demonstrated the successful generation of a classic CE profile 18 months after archiving extracted DNA. This validated approach produces a preliminary profile at the scene and enables laboratory analysis of the probative samples without the need for additional sample extraction. 4 tables, 55 figures, and 23 references
  Main Term(s): Forensics/Forensic Sciences
  Index Term(s): Evidence collection ; Suspect identification ; Crime Scene Investigation ; Crime scene ; Investigative techniques ; DNA fingerprinting ; NIJ final report
  Sponsoring Agency: National Institute of Justice (NIJ)
US Department of Justice
Office of Justice Programs
United States of America
  Grant Number: 2008-DN-BX-K012
  Sale Source: National Institute of Justice/NCJRS
Box 6000
Rockville, MD 20849
United States of America

NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
  Type: Report (Study/Research)
  Country: United States of America
  Language: English
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