Although chemical or genetic interruption of the NHEJ pathway can favor HDR (Shrivastav et al., 2008), such manipulations can be difficult to employ, harmful to cells or both.
In other words, larger degrees of transcriptional fluctuation triggered by genetic interruption were correlated with greater changes in gene expression induced by environmental perturbation.
Importantly, cardiomyocyte-specific genetic interruption of either mitochondrial fusion or fission is incompatible with mammalian life (Chen et al, 2011; Papanicolaou et al, 2012; Kasahara et al, 2013; Kageyama et al, 2014; Ishihara et al, 2015; Song et al, 2015).
Moreover, genetic interruption of UPR signaling molecules, such as XBP-1 or apoptosis signal-regulating kinase1 (ASK1), protects motor neurons in SOD1 mutant mice (Nishitoh et al., 2008; Hetz and Mollereau, 2014).
The finding that pharmacological and genetic interruption of the JNK pathway attenuated PEITC-mediated lethality indicates that stress pathways have a critical functional role in apoptosis induction by this agent.
In particular, PTP1B has been studied as potential therapeutic drug target in obesity and insulin resistance, since genetic interruption resulted in resistance to high-fat diet-induced insulin resistance and obesity [ 9, 10].
If the conventional notion is correct that smaller fragmented mitochondria are 'bad' and that larger more interconnected mitochondria are 'good', then genetic interruption of mitochondrial fission by ablating Drp1 should be beneficial (as was the case with pharmacological Drp1 inhibition in cardiac ischemic injury (Disatnik et al, 2013; Ong et al, 2010)).
The changes in gene expression between MDS42_heatshock and MG1655 represented simultaneous genetic and environmental interruptions (simultaneous contribution, ∆ T F ).
Such relationship would inhibit the transcriptional fluctuation that was amplified by the positive correlation between the changes in gene expression triggered by the genetic and environmental interruptions.
Theoretically, the positive correlation in the transcriptional changes triggered by the genetic and environmental interruptions potentially had a tendency to amplify the magnitude of the changes in gene expression that occurred in response to both genetic and environmental perturbations.
