skip navigation

Add your conference to our Justice Events calendar


Register for Latest Research

Stay Informed
Register with NCJRS to receive NCJRS's biweekly e-newsletter JUSTINFO and additional periodic emails from NCJRS and the NCJRS federal sponsors that highlight the latest research published or sponsored by the Office of Justice Programs.

NCJRS Abstract

The document referenced below is part of the NCJRS Library collection. To conduct further searches of the collection, visit the NCJRS Abstracts Database. See the Obtain Documents page for direction on how to access resources online, via mail, through interlibrary loans, or in a local library.

  NCJ Number: NCJ 241298   Add to Shopping cart   Find in a Library
  Title: Improved Detection of Male DNA in Post-Coital Samples
  Document URL: PDF 
  Author(s): Jack Ballantyne, Ph.D. ; Angela van Daal, Ph.D. ; Helge Lubenow, Ph.D.
  Date Published: 06/2012
  Page Count: 106
  Annotation: This is the final report on a project that developed a method of overcoming problems associated with the detection and analysis of low levels of male DNA in a background of female DNA, which often occurs in sexual assault cases.
  Abstract: The method developed involves a selective amplification of loci in Y-chromosomal genomic DNA prior to Y-STR analysis. This genomic partitioning is effective in further increasing the signal to noise ratio of the Y-chromosomal DNA compared with the female epithelial DNA, thus enabling clear male profiles to be obtained. The use of the nested PCR pre-amplification prior to Y-STR analysis allows the recovery of Y-STR profiles from as little as 5 pg of male DNA from various body fluids and tissues (blood, semen, saliva, and skin). No interference from female DNA was observed even with female DNA in 100,000-fold excess of male DNA. Male DNA was analyzed in post-coital samples obtained approximately 5 days after intercourse. In addition, such an approach could be used to improve the analysis of touch or contact DNA samples, which often contain small amounts of male DNA. The researchers developed a 17-locus Y- chromosome specific nested PCR pre-amplification multiplex. Initial validation studies have been conducted in order to show this method’s usefulness with forensic samples. Extensive tables and figures, 47 references, and a listing of publications and presentations of study findings
  Main Term(s): Forensics/Forensic Sciences
  Index Term(s): Suspect identification ; Rape investigations ; Investigative techniques ; DNA fingerprinting ; NIJ final report ; NIJ grant-related documents
  Sponsoring Agency: National Institute of Justice (NIJ)
US Department of Justice
Office of Justice Programs
United States of America
  Grant Number: 2007-DN-BX-K147
  Sale Source: NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
  Type: Report (Study/Research)
  Country: United States of America
  Language: English
  To cite this abstract, use the following link:

*A link to the full-text document is provided whenever possible. For documents not available online, a link to the publisher's website is provided. Tell us how you use the NCJRS Library and Abstracts Database - send us your feedback.