Therefore, not only would a mechanistic link between Piwi and the machinery for the selective deposition of H3 variant-containing nucleosomes into chromatin be required, but also a feedback loop for the regulation of histone variant gene expression.
These interactions are captured as Biological Regulatory Network BRNN) which acts to maintain the viability of host cell machinery through feedback control mechanism which is a characteristic of complex adaptive systems.
Some CCGs are special in the sense that they encode other core-clock regulators, such as Period and Cryptochrome genes, which negatively feedback on the clock machinery [ 1- 3].
Such protein protein interactions are hypothesized to influence the secretion of enamel proteins, establish short‐term order of the forming matrix, and to mediate feedback signals to the transcriptional machinery of these cells.
Deregulation in the functional status of mitochondria can have a feedback effect on nuclear transcriptional machinery [8], [9].
"Through complicated feedback loops implemented in its molecular machinery, the system responds to changes in solar intensity," says Schlau-Cohen.
After each iteration the extraction master presents the results to the user, who can provide feedback and re-run the extraction machinery so it can take the new feedback into account.
The actual transcript levels appear to be then partially restored to the "normal" light/dark oscillation; this is possibly caused by some feedback action mediated by the clock machinery.
The all-or-none character of this cell fate switch is hypothesized to arise out of two properties of the signal transduction machinery that mediates maturation, positive feedback, and ultrasensitivity.
We suggest that both saturation and the effect of saturation on competition reflect fundamental properties of the Rho-GTPase polarity machinery, regardless of the specific feedback mechanism, which predict whether the system will generate unipolar or multipolar outcomes.
