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lox$45559$ - translation to italian
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![Cape Canaveral]]](https://commons.wikimedia.org/wiki/Special:FilePath/Liquid Oxygen (LOX) ball at the CCAFS SLC-40.jpg?width=200 "Cape Canaveral]]")
![A [[U.S. Air Force]] technician transfers liquid oxygen to a [[Lockheed Martin C-130J Super Hercules]] aircraft at the [[Bagram Airfield]], Afghanistan.](https://commons.wikimedia.org/wiki/Special:FilePath/Liquid oxygen, Bagram Airfield, Afghanistan 4.jpg?width=200 "A [[U.S. Air Force]] technician transfers liquid oxygen to a [[Lockheed Martin C-130J Super Hercules]] aircraft at the [[Bagram Airfield]], Afghanistan.")
![[[Robert H. Goddard]] on March 16, 1926, holding the launching frame of his most notable invention{{snd}} the first liquid-fueled rocket](https://commons.wikimedia.org/wiki/Special:FilePath/Goddard and Rocket.jpg?width=200 "[[Robert H. Goddard]] on March 16, 1926, holding the launching frame of his most notable invention{{snd}} the first liquid-fueled rocket")
Definition
Wikipedia
Cre-Lox recombination is a site-specific recombinase technology, used to carry out deletions, insertions, translocations and inversions at specific sites in the DNA of cells. It allows the DNA modification to be targeted to a specific cell type or be triggered by a specific external stimulus. It is implemented both in eukaryotic and prokaryotic systems. The Cre-lox recombination system has been particularly useful to help neuroscientists to study the brain in which complex cell types and neural circuits come together to generate cognition and behaviors. NIH Blueprint for Neuroscience Research has created several hundreds of Cre driver mouse lines which are currently used by the worldwide neuroscience community.
An important application of the Cre-lox system is excision of selectable markers in gene replacement. Commonly used gene replacement strategies introduce selectable markers into the genome to facilitate selection of genetic mutations that may cause growth retardation. However, marker expression can have polar effects on the expression of upstream and downstream genes. Removal of selectable markers from the genome by Cre-lox recombination is an elegant and efficient way to circumvent this problem and is therefore widely used in plants, mouse cell lines, yeast, etc.
The system consists of a single enzyme, Cre recombinase, that recombines a pair of short target sequences called the Lox sequences. This system can be implemented without inserting any extra supporting proteins or sequences. The Cre enzyme and the original Lox site called the LoxP sequence are derived from bacteriophage P1.
Placing Lox sequences appropriately allows genes to be activated, repressed, or exchanged for other genes. At a DNA level many types of manipulations can be carried out. The activity of the Cre enzyme can be controlled so that it is expressed in a particular cell type or triggered by an external stimulus like a chemical signal or a heat shock. These targeted DNA changes are useful in cell lineage tracing and when mutants are lethal if expressed globally.
The Cre-Lox system is very similar in action and in usage to the FLP-FRT recombination system.
