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Related Concept Videos

Real Time RT-PCR02:57

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Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
The real-time quantification of the number of amplified products is...
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qPCR Is a Sensitive and Rapid Method for Detection of Cytomegaloviral DNA in Formalin-fixed, Paraffin-embedded Biopsy Tissue
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Direct qPCR quantification of unprocessed forensic casework samples.

Jason Yingjie Liu1

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

Forensic Science International. Genetics
|April 8, 2014
PubMed
Summary
This summary is machine-generated.

Forensic scientists can now screen DNA samples faster using a novel PE-Swab. This direct quantification method bypasses DNA extraction, prioritizing samples for short tandem repeat (STR) typing and improving efficiency in crime labs.

Keywords:
DNA extractionDirect STR amplificationDirect qPCRDirect quantificationDirect real-time PCRPE-Swab

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Area of Science:

  • Forensic Science
  • Molecular Biology
  • Genetics

Background:

  • Current forensic DNA analysis workflow involves multiple steps including sample collection, screening, DNA extraction, quantification, and short tandem repeat (STR) amplification.
  • Existing screening methods lack DNA-specific information and are ineffective for touch DNA samples, which are prevalent in property crime cases.
  • Crime laboratories face significant DNA backlogs, necessitating improved screening tools to prioritize samples with higher probative value.

Purpose of the Study:

  • To develop and validate a direct quantification technology for forensic casework samples that bypasses the need for DNA extraction and purification.
  • To introduce the PE-Swab as a novel sample collection device enabling direct quantitative polymerase chain reaction (qPCR) analysis.
  • To assess the utility of direct qPCR for sample screening and normalization of DNA input for direct STR amplification.

Main Methods:

  • A novel PE-Swab was utilized for sample collection, allowing direct generation of a sample punch for qPCR analysis.
  • Optimization of punch size and quantification software baseline settings were performed to ensure accurate DNA quantification.
  • Proof-of-concept studies were conducted using low-level touch DNA and blood samples.
  • Direct STR amplification from PE-Swab samples without prior DNA extraction was also investigated.

Main Results:

  • Accurate DNA quantification was achieved directly from PE-Swab samples, eliminating the need for DNA extraction and purification.
  • The PE-Swab facilitated direct STR amplification, demonstrating the feasibility of a streamlined workflow.
  • The direct qPCR assay proved effective for both DNA quantification and normalization of input for subsequent amplification.

Conclusions:

  • The developed direct qPCR assay using the PE-Swab offers a significant improvement for forensic DNA analysis, particularly for screening purposes.
  • This technology can help alleviate DNA backlogs by enabling rapid prioritization of casework samples.
  • The PE-Swab facilitates a more efficient workflow, allowing direct quantification and amplification, especially beneficial for touch DNA samples.