Restriction Site Cloning
Restriction Site Cloning - Related Videos
09:55
Molecular Cloning
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2023
Molecular cloning is a set of methods, which are used to insert recombinant DNA into a vector - a carrier of DNA molecules that will replicate recombinant DNA fragments in host organisms. The DNA fragment, which may be a gene, can be isolated from a prokaryotic or eukaryotic specimen. Following isolation of the fragment of interest, or insert, both the vector and insert must be cut with restriction enzymes and purified. The purified pieces are joined together though a technique called...
14:23
A Restriction Enzyme Based Cloning Method to Assess the In vitro Replication Capacity of HIV-1 Subtype C Gag-MJ4 Chimeric Viruses
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Cited by 12 •
2014
HIV-1 pathogenesis is defined by both viral characteristics and host genetic factors. Here we describe a robust method that allows for reproducible measurements to assess the impact of the gag gene sequence variation on the in vitro replication capacity of the virus.
09:45
Restriction Enzyme Digests
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2023
Restriction enzymes or endonucleases recognize and cut DNA at a specific sequence. These enzymes occur naturally in bacteria as a defense against bacteriophages - viruses that infect bacteria. Bacterial restriction enzymes cut the invading bacteriophage DNA while leaving the bacterial genomic DNA unharmed due to addition of methyl groups. This video explains the basic principles of restriction enzymes including: how restriction enzymes are named and the types of recognition sites and...
01:27
Reproductive Cloning
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2019
Reproductive cloning is the process of producing a genetically identical copy—a clone—of an entire organism. While clones can be produced by splitting an early embryo—similar to what happens naturally with identical twins—cloning of adult animals is usually done by a process called somatic cell nuclear transfer (SCNT). Somatic Cell Nuclear Transfer In SCNT, an egg cell is taken from an animal and its nucleus is removed, creating an enucleated egg. Then a somatic cell—any cell that is not a sex...
06:28
Standardized Modular Assembly of Polycistronic Operons with Modular Cloning (MoClo) using the In-Cloning toolkit
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2025
This article presents a step-by-step protocol demonstrating how Modular Cloning (MoClo) can be adapted for the cloning of polycistronic operons.
FAQs
Matching recognition sequences on the DNA fragment and vector allow the same restriction enzyme to cut both molecules at corresponding locations. This creates compatible ends, so the insert can align with the vector rather than being joined at an arbitrary position. The defined placement supports reproducible construction of recombinant DNA for later analysis.
Sticky ends provide short complementary regions that can base-pair when the cleaved DNA fragment and vector are combined. This pairing holds the molecules in alignment, while DNA ligase seals the remaining breaks in the sugar-phosphate backbone. Together, these steps convert temporary molecular alignment into a stable recombinant DNA construct.
The vector provides the DNA framework that carries the inserted fragment through subsequent experimental steps. Once assembled, the recombinant construct can be amplified, sequenced, or introduced into host cells. In immunology and infection studies, this framework can support investigation of genes encoding antigens, antibodies, immune-signaling proteins, or microbial components.
Successful assembly depends on having suitable recognition sequences in corresponding positions on the target DNA and vector. The restriction enzyme must cleave both molecules at those sites, and the resulting ends must be compatible for base-pairing. These conditions determine whether the fragment can be aligned with the vector before ligase seals the backbone.
A basic workflow identifies matching restriction sites in the target fragment and vector, uses the appropriate restriction enzyme to cleave both DNA molecules, combines the resulting compatible ends, and applies DNA ligase to seal the backbone. The completed recombinant DNA can then proceed to amplification, sequencing, or introduction into host cells.
The resulting construct can be amplified to obtain additional copies or sequenced to examine its DNA composition. These outputs help researchers work with the engineered fragment and determine its sequence for later experiments. Introducing the construct into host cells provides another route for studying the behavior or expression of the inserted genetic material.
Researchers can use the method to construct plasmids expressing antigens, antibodies, immune-signaling proteins, or microbial genes. Introducing these constructs into host cells supports studies of pathogen biology and immune responses, while amplification and sequencing provide molecular material for analysis. The same strategy can also help investigate potential diagnostic or therapeutic targets.