SoftGenetics - Software PowerTools for Genetic Analysis

 

 

 

 

Time Saving, Quality Evaluation tools in GeneMarkerHID Software include an Embedded Contamination Check

The European Network of Forensic Science Institutes (ENFSI), the FBI Laboratory’s Scientific Working Group on DNA Analysis Methods (SWGDAM), and the Australian Biology Specialist Advisory Group (BSAG) issued a joint statement: “Because the sensitive PCR technique replicates any and all of the DNA contained in an evidence sample, greater attention to contamination issues is necessary.” The groups advocate for all forensic DNA laboratories to maintain an elimination database for screening DNA results. The results of a 2015 study by Séguin et al. published in Forensic Science International: Genetics, illustrates the importance of including genotypes of all crime scene workers (police, laboratory and field employees) in an elimination database. Typically, labs will compare profiles in spread sheets with macros to detect profile-to-profile and profile-to-staff member contamination, which is time consuming and error prone.

 

GeneMarkerHID software enables the analyst to easily and automatically perform profile comparisons to check for contamination, eliminating data transfer to a separate database or spreadsheet/macro. GeneMarkerHID software is compatible with major CE and Rapid Instrument data files, Windows® 7 – 10 OS and all major commercial human identity chemistries.

 

Cross contamination of a DNA sample can occur from several sources. Sources of potential staff member-to-case profile contamination include touch DNA (property crime), cold cases, and handling by multiple individuals in the chain of custody process. Examples of profile–to–profile contamination within a project include: low template DNA from surface swabs, overloading or spectral overlap issues from capillary electrophoresis and sample mishandling. GeneMarkerHID software has built-in contamination detection.

 

The contamination check provides an immediate screening for contamination:

  1. Profile-to-Profile contamination within a project
  2. Staff member genotype inclusion in profile(s)

View the ISHI 2016 poster: Identify QC Problems Automatically

 

View The Contamination Check Tool (View) (view on ) Webinar
Read the Application Note: Automated Contamination Check Tool in GeneMarker®HID Software (PDF)

 

Figures 1 and 2 provide a summary of the Contamination Check in GeneMarkerHID software and are followed with details on the equation and features of the contamination check.

 

Contamination Check Setting Options and Result Tables

Finished-Main Window.png

Figure 1: Profile-to-Profile check. In Group 1, 100% of the Reference sample alleles are included in the comparison sample. In Group 2, 55% of the alleles in the reference sample are included in the comparison sample. The last column of each row contains the shared genotype. The results can be saved as a .txt or .xlsx/.xls file from the disk icon.

 

Contamiation Check Tool Results

Loading Genotypes2.png
Figure 2: Profile-to-Staff or Elimination Database. The With DB tab displays the results comparing samples from the project with reference samples in the database. The single source file from the case and several other single source files were previously saved to the database to provide matches to the two samples of the project for this demonstration. The results indicate that 100% of the allele calls in MX05case2_victim sample are included in the comparison samples 1 and 2. Four profiles from the database (Reference Samples) have greater than 50% similarity to the Control Sample MX05case2_evidence.fsa of the current project. Note also that reference profiles retrieved from the database are designated with DB:filename in the Reference Sample column.

 

Calculation Details and Features of the Contamination Check Tool
The equation used to calculate the similarity ratio is:

Genotyping.PNG

 

The settings of the contamination tool may be customized per the lab SOP and include the following options:

  • Include or exclude allelic ladders and controls
  • Specify the number of Null Markers to allow before reporting a similarity ratio for a profile
  • The minimum percent similarity
  • Specify a file of interest (if this is left blank all samples in the project will be checked for contamination)
  • Match type
    - Within a project – (profile-to-profile)
    - With DB (profiles-to-Database)
  • Select the database to screen (Contamination – staff member, Relationship testing or cell line databases)
  • Display File name or Sample Name
  • Icons to save genotypes to the contamination(staff) database, edit the database, refresh table after changing any parameters and save report tables

SoftGenetics - Software PowerTools for Genetic Analysis

Features and Benefits

Time Saving Linked Tools

Quality Evaluation Tools

Site Tools

 

 

SoftGenetics - Software PowerTools for Genetic Analysis

 

 

SOFTWARE


Review all of our software products

 

 

 

 

 

 

 

 

 

SoftGenetics - Software PowerTools for Genetic Analysis

 

 

 

SoftGenetics Software PowerTools for Genetic Analysis provides current up-to-date information and pricing on all products.
All requests are secure.

 

SoftGenetics - Software PowerTools for Genetic Analysis

 

 

EXPERTISE


Request trial versions of our software and tap into our knowledge base

 

 

Trial Software

All of our software products are available for review and trial periods. Please use link to request a trial version.

 

Request Trial >>

 

Online Training

Our software professionals are available to you for online training of any of our products. Please contact an expert now.

 

Request Training >>

 

Webinars

SoftGenetics provides online webinars to assist you in the growing knowledge of our products. Visit our Analysis Corner.

 

View Webinars >>

 

SoftGenetics - Software PowerTools for Genetic Analysis

 

 

SEND US A MESSAGE


Representatives are always ready to assist you


Name *
Email *
Phone

###
-
###
-
####
Message *

 

SoftGenetics - Software PowerTools for Genetic Analysis

100 Oakwood Avenue | Suite 350 | State College, PA 16803 | USA
Phone: 814-237-9340 or 888-791-1270
Email: info@softgenetics.com

 

© 2020 SoftGenetics, LLC. All rights reserved

Trademarks are property of their respective owners

Research use only (RUO)

 

Web design by Lovett Creations