Dna Contamination Detection
Dna Contamination Detection - Related Videos
13:16
Assessment of DNA Contamination in RNA Samples Based on Ribosomal DNA
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Cited by 26 •
2018
Here, we present a protocol for tracing genomic DNA (gDNA) contamination in RNA samples. The presented method utilizes primers specific for the internal transcribed spacer region (ITS) of ribosomal DNA (rDNA) genes. The method is suited for reliable and sensitive detection of DNA contamination in most eukaryotes and prokaryotes.
03:08
Detecting Bacterial Contamination Using Magneto-fluorescent Nanosensors
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2025
This video demonstrates a technique to detect bacterial contaminants in food and water samples using nanosensors. The target pathogenic bacteria are detected through a combination of magnetic relaxation and fluorescence emission modalities.
07:50
Detection and Removal of Nuclease Contamination During Purification of Recombinant Prototype Foamy Virus Integrase
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Cited by 10 •
2017
Recombinant prototype foamy virus integrase protein is often contaminated with a bacterial nuclease during purification. This method identifies nuclease contamination and removes it from the final preparation of the enzyme.
06:19
Comet Assay for DNA Damage Detection in Cells
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2025
The video demonstrates the comet assay for detecting DNA damage following exposure to harmful agents. Under alkaline conditions, the DNA unwinds and denatures, and upon electrophoresis, the undamaged and damaged DNA migrate differently in the agarose gel, forming a comet-shaped structure. The slowly migrating undamaged DNA forms the circular comet head, while the rapidly migrating damaged DNA fragments form the elongated comet tail.
09:32
ampliPHOX Colorimetric Detection on a DNA Microarray for Influenza
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Cited by 4 •
2011
ampliPHOX colorimetric detection technology is presented as an inexpensive alternative to fluorescence detection for microarrays. Based on photopolymerization, ampliPHOX produces solid polymer spots visible to the naked eye in just a few minutes. Results are then imaged and automatically interpreted with a simple yet powerful software package.
FAQs
Detection depends on comparing the genetic profile expected from a sample with characteristic sequence markers. If foreign DNA is present, the observed pattern may differ from the expected profile or indicate a mixture. This comparison is important because it turns an apparently usable specimen into a result that can be evaluated for sample integrity.
Amplification-based testing and sequencing provide different ways to examine characteristic genetic markers. Amplification-based testing checks whether selected markers produce evidence consistent with the expected material, while sequencing examines sequence information directly. Either approach can help distinguish the intended sample profile from foreign or mixed DNA before researchers interpret downstream genetic results.
Low-input samples and closely related DNA samples require particularly careful validation because contamination may be difficult to distinguish from the material researchers intended to study. A robust detection step helps establish whether the observed genetic information belongs to the expected sample or includes an unintended contribution, reducing the risk of false findings.
Testing can examine more than the biological sample itself, because unintended DNA may also occur in laboratory reagents or elsewhere in the experimental workflow. Comparing findings across these parts of the process can help researchers trace a contamination source. That information supports corrective quality control and improves the reproducibility of later genetic analyses.
A practical workflow begins by isolating DNA from the material being checked. The isolated material is then examined for characteristic sequence markers using amplification-based testing or sequencing. The resulting pattern is compared with the expected sample profile before the material proceeds to downstream genetic analysis. This sequence creates a checkpoint for sample validation.
DNA contamination detection is most useful before downstream procedures whose conclusions depend on sample identity and purity. In the stated genetics applications, those procedures include PCR, genotyping, cloning, and sequencing. Performing the check before analysis allows researchers to identify questionable material early, rather than carrying an unrecognized contamination problem into later results.
A contamination check can help prevent foreign or mixed DNA from producing misleading genetic findings. By validating the sample and examining possible sources in the workflow, researchers can protect the accuracy and reproducibility of PCR, genotyping, cloning, and sequencing results. The resulting quality-control evidence also supports more confident interpretation of downstream data.