To explore the specific functions of E-cad in comparison to N-cad in vivo, we made use of a knock-in mouse line in which N-cad is expressed under the regulatory control of the E-cad locus [ 7].
The use of a parasite that can knock out the invading green crab in the waters off San Francisco could unwittingly destroy the prized Dungeness crab industry as well.
Recently, we reported the use of a novel Alk1-Cre knock-in mouse strain to investigate roles for TGFβR2 and Alk5 receptors in endothelial cells during embryonic brain angiogenesis (Nguyen et al., 2011).
Mouse models will continue to allow for the dissection of mechanistic pathways of GvHD through the use of informative genetic knock-out, knock-in and knock-down experiments that are only possible in the mouse.
Russia's use of a dangerous incapacitating gas to knock out Chechen terrorists who had seized more than 750 hostages at a Moscow theater has underscored the urgent need to develop safer methods to immobilize hostage takers without harming their hostages.
Additionally, the use of an antisense oligonucleotide to knock down miR-122 in vivo resulted in significant up-regulation of both Nocturnin mRNA and protein expression in mouse liver during the night, resulting in Nocturnin rhythms with increased amplitude.
Through the use of Zmpste24-knock mice as a model to understand premature aging, interesting insights have been obtained on how genomic integrity can be regulated by epigenetic mechanisms such as histone acetylation.
For this purpose, JunB was knocked down by the use of a specific and previously validated siRNA (29).
In particular, thanks to deletion strains and the use of knock down methods, it has been possible to identify a range of genes and small metabolite determinants that effect the life-history of laboratory model species such as Saccharomyces cerevisiae, Drosophila melanogaster, Arabidopsis thaliana and C. elegans, [ 3, 22- 24].
The use of null knock-in alleles allows investigators to compare cells that express a SSTF, in heterozygotes, to the equivalent cells, in mutants, that "should have" expressed the SSTF.
