1. Technique

2. Uses

3. Knockout Mouse Project (KOMP)

4. References

Technique

The most commonly used technique is the Cre-lox recombination system. The Cre recombinase enzyme specifically recognizes two lox (loci of recombination) sites within DNA and causes recombination between them. During recombination two strands of DNA exchange information. This recombination will cause a deletion or inversion of the genes between the two lox sites, depending on their orientation. An entire gene can be removed to inactivate it.^[1][3] This whole system is inducible so a chemical can be added to knock genes out at a specific time. Two of the most commonly used chemicals are tetracycline, which activates transcription of the Cre recombinase gene and tamoxifen, which activates transport of the Cre recombinase protein to the nucleus.^[4] Only a few cell types express Cre recombinase and no mammalian cells express it so there is no risk of accidental activation of lox sites when using conditional gene knockout in mammals. Figuring out how to express Cre-recombinase in an organism tends to be the most difficult part of this technique.^[3]

Uses

The conditional gene knockout method is often used to model human diseases in other mammals.^[2] It has increased scientists’ ability to study diseases, such as cancer, that develop in specific cell types or developmental stages.^[4] It is known that mutations in the BRCA1 gene are linked to breast cancer. Scientists used conditional gene knockout to delete the BRCA1 allele in mammary gland tissue in mice and found that it plays an important role in tumour suppression.^[3]

A specific gene in mouse brain thought to be involved in the onset of Alzheimer's disease which codes for the enzyme cyclin-dependent kinase 5 (Cdk5) was knocked out. Such mice were found to be 'smarter' than normal mice and were able to handle complex tasks more intelligently compared to 'normal' mice bred in the laboratory.^[5]

Knockout Mouse Project (KOMP)

Conditional gene knockouts in mice are often used to study human diseases because many genes produce similar phenotypes in both species. The goal of KOMP is to create knockout mutations in the embryonic stem cells for each of the 20,000 protein coding genes in mice.^[2] The genes are knocked out because this is the best way to study their function and learn more about their role in human diseases. Some alleles in this project cannot be knocked out using traditional methods and require the specificity of the conditional gene knockout technique. Other combinatorial methods are needed to knockout the last remaining alleles. Conditional gene knockout is a time-consuming procedure and there are additional projects focusing on knocking out the remaining mouse genes.^[6] The KOMP projected was started in 2006 and is still ongoing.^[7]

References

• Procerithiidae
• Procerobatrachus
• Proceromyia
• Procerosuchus
• Procerothiidae
• Proces de Jeanne d'Arc
• Procesi k Panence
• Proceso a la infamia
• Proceso Alcala
• Proceso (disambiguation)
• Proces (román)
• Processability theory
• Process addiction
• Process analysis
• Process analytical chemistry
• Process Analytical Technology
• Process annealing
• Process architecture
• Process camera
• Process (Candy Lo)
• Process Candy Lo
• Process Capability Index
• Process-centered design
• Process chemicals
• Process choreography