Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Increasing DNA extraction yield from saliva stains with a modified Chelex method

D Sweet1, M Lorente, A Valenzuela

  • 1University of British Columbia, Faculty of Dentistry, Vancouver, Canada. dsweet@unixg.ubc.ca

Forensic Science International
|December 27, 1996
PubMed
Summary

Forensic scientists can now recover more DNA from skin saliva stains. A modified Chelex method significantly improves DNA recovery for accurate forensic identification.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

The Impact of Dual Cannabis and Tobacco Smoking in Young Patients With Lung Cancer: Results From the Prospective "Environment and Lung Cancer" Study.

Chest·2025
Same author

D-dimer as a predictive biomarker for cancer-associated thrombosis: A prospective cohort study.

Thrombosis research·2025
Same author

Quality improvement project to improve providers' goal-setting activity for chronic disease self-management.

Journal of healthcare quality research·2021
Same author

Testing a Paul trap through determining the evaporation rate of levitated single semi-volatile organic droplets.

Optics express·2020
Same author

Postmortem fatal and non-fatal concentrations of amlodipine.

Forensic science international·2020
Same author

Full path single-shot imaging of femtosecond pulse collapse in air turbulence.

Optics letters·2020

Area of Science:

  • Forensic Science
  • Molecular Biology
  • Genetics

Background:

  • Body fluid stain analysis is critical in forensic science.
  • DNA typing from stains aids in perpetrator identification and suspect exclusion.
  • Efficient DNA extraction from skin-associated stains is challenging.

Purpose of the Study:

  • To develop and validate an improved method for genomic DNA extraction from saliva stains on human skin.
  • To compare the efficacy of the new method against traditional organic and Chelex extraction techniques.
  • To assess the suitability of the extracted DNA for Polymerase Chain Reaction (PCR)-based short tandem repeat (STR) typing.

Main Methods:

  • Simulated bite mark scenarios were used to deposit saliva stains on human skin.
  • Genomic DNA was extracted using organic (phenol-chloroform) extraction, classical Chelex extraction, and a modified Chelex method.

Related Experiment Videos

  • The modified Chelex method incorporated pre-extraction with proteinase K and specific temperature incubations (56°C and 100°C) followed by microconcentration.
  • DNA quantification was performed to assess recovery rates.

    • Main Results:

    • Classical Chelex extraction yielded a DNA recovery of 31.9 ± 4.22%.
    • The modified Chelex extraction method significantly increased DNA recovery to 47.7 ± 6.90%.
    • The DNA extracted using the modified method was of sufficient quantity and quality for PCR-based STR typing at two loci.

    Conclusions:

    • The modified Chelex extraction method offers a substantial improvement in genomic DNA recovery from saliva stains on human skin.
    • This enhanced DNA recovery is crucial for increasing the success rate of forensic DNA profiling in challenging casework.
    • The developed method provides a more efficient approach for forensic analysis, aiding in accurate identification and exclusion.