Site-directed Integration
Site-directed Integration - Related Videos
04:21
phiC31-Integrase-Mediated Site-Directed Transgene Integration: A Microinjection Technique for Site-Specific Transgene Integration into an Anopheles Vector
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2025
In this video, we demonstrate phiC31-mediated site-specific transgene integration in the Anopheles embryo via microinjection. This method helps introduce desired genes into a host system for research and industrial applications.
05:47
A Direct Force Probe for Measuring Mechanical Integration Between the Nucleus and the Cytoskeleton
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Cited by 2 •
2018
In this protocol, we describe a micropipette method to directly apply a controlled force to the nucleus in a living cell. This assay allows interrogation of nuclear mechanical properties in the living, adherent cell.
09:38
Site-Directed φC31-Mediated Integration and Cassette Exchange in Anopheles Vectors of Malaria
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Cited by 3 •
2021
The protocol describes how to achieve site-directed modifications in the genome of Anopheles malaria mosquitoes using the φC31 system. Modifications described include both the integration and the exchange of transgenic cassettes in the genome of attP-bearing docking lines.
12:30
Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards
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Cited by 2 •
2006
Testing visual sensitivity in lizards using an operant conditioning paradigm that employs video playback of random-dot kinematograms and computer-generated invertebrates.
01:09
Directing Effect of Substituents: meta-Directing Groups
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2025
Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the ortho, meta, and para...
FAQs
The targeting system determines how the genomic locus is selected and how donor DNA is placed. CRISPR-associated nucleases can act at a chosen sequence, whereas recombinases recognize compatible sequence features, and homologous recombination uses matching genomic regions. These systems therefore provide distinct molecular routes for directing a construct to a defined location.
Orientation determines how an inserted sequence is arranged relative to nearby genomic elements, while copy number affects how many copies of the construct occupy the locus. Controlling both variables improves reproducibility and helps researchers interpret transgene expression or gene-replacement outcomes without confusing differences caused by uncontrolled insertion arrangements.
Random insertion can place a construct at unpredictable genomic positions, creating uncertainty about its orientation, copy number, and local genomic effects. Site-directed integration instead focuses modification at a predetermined locus. This greater control reduces insertional uncertainty and positional effects, making comparisons among engineered cells more consistent for studies of gene function and regulation.
The selected locus can influence how an inserted sequence functions within the genome. By placing a construct at a defined position, researchers can reduce variation caused by different insertion sites and create more standardized genetic backgrounds. This supports clearer analysis of gene regulation, transgene expression, and resulting changes in cellular behavior.
Planning generally involves identifying a suitable genomic target, selecting a sequence-specific system, and preparing a donor construct compatible with that target. The design can also specify the intended orientation and copy number. Together, these choices determine how precisely the genetic modification can be positioned and how reproducibly engineered cells can be compared.
The method is especially useful when a study requires stable transgene expression, a defined reporter-cell configuration, or a reproducible genetic background. Directing the construct to the same locus across cell-line development reduces insertional uncertainty, which helps researchers compare cellular responses and interpret differences as effects of the experimental genetic modification.
For gene replacement, the approach places a donor sequence at the intended genomic locus, supporting controlled modification of the corresponding genetic region. For reporter cells, it enables a reporter construct to occupy a defined position rather than an unpredictable site. Both applications strengthen studies of gene function, regulation, and cellular behavior.