Dna Hairpins
Dna Hairpins - Related Videos
00:55
DNA Helicases
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2020
DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
01:02
The DNA Replication Fork
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2020
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
03:06
From DNA to Protein
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2020
The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
06:00
HCR-DNA FISH: A Fluorescence In Situ Hybridization Technique to Detect Viral DNA in Infected Cells
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2023
In this video, the cells infected with MCPyV virions were subjected to in situ hybridization chain reaction to detect MCPyV specific genomes. Further, the DNA-HCR technique was combined with FISH to visualize the MCPyV DNA in infected human skin cells.
03:47
Short Hairpin RNA-Mediated Gene Knockdown in iHSPCs In Vitro: A Lentivirus-Based shRNA Expression System Delivery into iHSPCs for Knockdown of Specific Gene Expression
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2025
In this video, we demonstrate a method to perform transduction of shRNA lentiviral vectors to obtain stable knockdown cell lines in immortalized hematopoietic stem and progenitor cells (iHSPCs).
FAQs
Complementary base pairing stabilizes the stem by bringing two matching segments of one strand into contact, while the loop remains unpaired and connects those segments. The resulting structure depends on whether an inverted repeat can align effectively and on the energetic balance between stem pairing and loop formation. This makes hairpin behavior strongly sequence dependent.
Temperature and ionic strength are important experimental variables because they can alter whether a potential stem-loop arrangement remains favorable. Comparing hairpin behavior under different conditions helps distinguish a sequence-driven structural tendency from a condition-sensitive one. These controls are especially relevant when interpreting biochemical measurements or evaluating whether an engineered sequence will retain its intended structure.
Loop size and sequence composition influence how readily complementary regions can form a stable arrangement. A change in either feature can therefore alter the structural behavior of the same general inverted-repeat pattern, even when the overall strand length is similar. Examining these variables helps connect a specific DNA sequence to differences in hairpin stability and potential genome effects.
Within biochemical systems, hairpins can affect replication, recombination, and transcription by changing the structure presented by a DNA strand. Their significance extends beyond a local fold: sequence-dependent hairpin formation can contribute to genome stability or variation. Studying the structure therefore links molecular base pairing with larger changes in how DNA participates in cellular processes.
To evaluate a candidate DNA hairpin, first look for an inverted-repeat sequence capable of bringing complementary regions together. Then consider the predicted stem and loop, sequence composition, loop size, temperature, and ionic strength. Assessing these features together provides a structured way to compare likely hairpin formation rather than relying on the presence of a repeat alone.
Analysis can identify sequence-dependent structural tendencies that may help explain genetic variation or differences in genome stability. It can also clarify how a DNA strand may present altered molecular features during replication, recombination, or transcription. In biochemistry, this connects sequence inspection with hypotheses about DNA behavior and the molecular interactions influenced by secondary structure.
Engineered hairpins can serve as components of molecular probes, biosensors, and nucleic-acid nanotechnology. Their value comes from designing a sequence so that complementary regions create a controllable secondary structure, allowing the hairpin to participate in a specified molecular design. These applications extend hairpin analysis from naturally occurring genome features to deliberately constructed biochemical systems.