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Direct qPCR quantification using the Quantifiler(®) Trio DNA quantification kit.

Jason Yingjie Liu¹

¹Human Identification, Thermo Fisher Scientific, 180 Oyster Point Boulevard, South San Francisco, CA 94080, USA.

Forensic Science International. Genetics

|July 23, 2014

Summary

This summary is machine-generated.

The Quantifiler® Trio DNA quantification kit effectively quantifies low-level forensic DNA samples directly, improving direct Short Tandem Repeat (STR) analysis reliability for touch DNA. This method enhances sensitivity and accuracy for forensic casework.

Keywords:

Case work samples Direct DNA quantification Direct PCR amplification Forensic science PE-Swab Quantifiler(®) Trio

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Area of Science:

Forensic Science
Molecular Biology
Genetics

Background:

Direct quantification assays are crucial for the widespread adoption of combined direct quantification/direct Short Tandem Repeat (STR) workflows in forensic science.
Accurate DNA quantification is essential for optimizing downstream processes like STR amplification, especially with limited or degraded samples.

Purpose of the Study:

To investigate the feasibility of using the Quantifiler® Trio DNA quantification kit for direct quantification of forensic casework samples.
To evaluate the reliability of the Quantifiler® Trio kit in predicting direct STR amplification results for low-level touch DNA samples.

Main Methods:

Forensic casework samples, including low-level touch DNA and blood, were collected on PE swabs.
Direct quantification of collected samples was performed using the Quantifiler® Trio DNA quantification kit.
Direct STR amplification was performed using the GlobalFiler™ PCR amplification kit for comparison.

Main Results:

The Quantifiler® Trio kit demonstrated increased sensitivity, detecting less than 10pg of DNA in unprocessed touch samples.
This kit minimized stochastic effects across different targets within the same sample.
Direct quantification results using the Quantifiler® Trio kit showed higher reliability in predicting direct STR results for low-level touch DNA (<10pg) compared to the Quantifiler® Duo kit.

Conclusions:

The Quantifiler® Trio DNA quantification kit is effective for the direct quantification of forensic casework samples, including low-level touch DNA.
Direct quantification with the Quantifiler® Trio kit provides accurate DNA quantity information for optimizing direct STR amplification.
The Quantifiler® Trio kit offers a more reliable method than the Quantifiler® Duo kit for predicting STR results from ultra-low-level unprocessed touch DNA samples.