It is reasonable to assume that in regions of high mutation activity this is a good description [ 11].
Two prerequisite pieces of information, the impact expression, loss and the protein property changed by the mutation, activity are detected.
In the present study, we performed a side-by-side comparison of the somatic mutation activity and toxicity of these TALEN scaffolds using Xenopus tropicalis (X. tropicalis).
In order to confirm that the final construct, Rho-MatB, lacked enzymatic activity, as expected due to its K488A mutation, activity was measured using a coupled-enzyme assay with consumption of NADH (reduced nicotinamide adenine dinucleotide).
Furthermore, a lower toxicity and comparable or higher somatic mutation activity were reported in zebrafish using TALENs harboring an obligate heterodimeric FokI nuclease domain than using TALENs containing homodimeric FokI (Cade et al., 2012).
Although TALEN-mediated gene knockout is a powerful approach for addressing gene functions in Ciona, constructed TALENs do not always have sufficient mutation activity and therefore another approach that can compensate for inactive TALENs is necessary.
However, this mutation reduced activity towards oxaloacetate by another 100-fold, with no increase in pyruvate activity.
Moreover, in Niemann-Pick, type C cells (containing NPC1 mutation), TRPML1 activity was found to be inhibited by cholesterol accumulation in lysosomes, and increasing TRPML1 activity alleviated lysosomal storage in these cells (Shen et al., 2012).
The V74G mutation decreased activity 5-fold with the loop residues intact, whereas the same mutation slightly increased activity in an enzymatic background with the loop residues mutated to glycine.
Reducing the size of the single-stranded region of 6S RNA with deletion mutation destroys activity.
Beside gene mutation, p53 activity could be impaired also as consequence to a conformational change.
