Environmental Dna Amplification
Environmental Dna Amplification - Related Videos
09:31
Amplification, Next-generation Sequencing, and Genomic DNA Mapping of Retroviral Integration Sites
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Cited by 56 •
2016
We describe a protocol for amplifying retroviral integration sites from the genomic DNA of infected cells, sequencing the amplified virus-host junctions, and then mapping these sequences to a reference genome. We also describe techniques to quantify the distribution of integration sites relative to various genomic annotations using BEDTools.
09:36
Visualization of Mitochondrial DNA Replication in Individual Cells by EdU Signal Amplification
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Cited by 11 •
2010
We developed a sensitive technique to label newly synthesized mitochondrial DNA (mtDNA) in individual cells in order to study mtDNA biogenesis. The technique combines the incorporation of EdU together with a tyramide signal amplification (TSA) protocol to visualize mtDNA replication within subcellular compartments of neurons.
08:04
Use of a Filter Cartridge for Filtration of Water Samples and Extraction of Environmental DNA
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Cited by 133 •
2016
We describe a protocol for filtration of water samples with a filter cartridge and extraction of environmental DNA (eDNA) without having to cut open the housing to remove the filter. This protocol is developed for metabarcoding eDNA from fishes, but is also applicable to eDNA from other organisms.
13:46
Separation of Single-stranded DNA, Double-stranded DNA and RNA from an Environmental Viral Community Using Hydroxyapatite Chromatography
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Cited by 5 •
2011
We describe an efficient method to separate single-stranded DNA, double-stranded DNA and RNA molecules from environmental viral communities. Nucleic acids are fractionated using hydroxyapatite chromatography with increasing concentrations of phosphate-containing buffers. This method permits the isolation of all viral nucleic acid types from environmental samples.
09:44
Rapid Amplification of cDNA Ends
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2023
Source: Pablo Sanchez Bosch2, Sean Corcoran2 and Katja Brückner1,2,3 1Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research 2Department of Cell and Tissue Biology, 3Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA, USA Rapid Amplification of cDNA Ends (RACE) is a technique that allows amplification of full-length cDNA from mRNA by extending to the 3’ or 5’ end, even without prior knowledge of the sequence (Frohman et al.,...
FAQs
Target-specific primers determine which environmental DNA sequences can be copied, so amplification is not simply an increase in all genetic material. During each cycle, denaturation separates DNA strands, primer binding selects complementary target regions, and extension allows the heat-stable polymerase to build new strands. This selectivity supports species-specific biological detection from mixed samples.
The heat-stable DNA polymerase carries out strand extension after primers bind to their target sequences. Its stability allows the reaction to proceed through repeated cycles that include high-temperature denaturation. By supporting extension in successive cycles, the enzyme helps convert scarce genetic material from an environmental sample into an amount suitable for sequence analysis.
Repeated PCR cycles progressively increase the quantity of a selected DNA target that was initially present at low abundance in water, soil, or sediment. The growing amount makes the sequence more detectable for downstream analysis. This amplification step is therefore especially valuable when biological surveys must work with genetic traces rather than collected organisms.
Environmental samples require careful handling because amplification can reproduce trace contaminants as well as genuine genetic material. Procedures should include contamination prevention throughout sample processing, from recovery of water, soil, or sediment through laboratory amplification. Maintaining this control helps ensure that detected sequences more reliably reflect the biological material present in the investigated environment.
Negative controls provide a check for DNA introduced during sample handling or laboratory processing rather than originating in the environmental sample. They are used alongside contamination-prevention practices because the amplification system is highly sensitive to trace genetic material. If contamination affects a control, researchers can interpret apparent detection results cautiously instead of treating every amplified signal as biological evidence.
After amplification, researchers can analyze the resulting sequences to detect species, assess biodiversity, or monitor pathogens. The approach supports biological surveys without requiring collection of whole organisms, making genetic traces from environmental samples useful for studying community presence and environmental biological patterns. Its value depends on careful handling and controls that support credible interpretation of detected sequences.