MPD and IPK from this Chloroflexi bacterium, R. castenholzii, complete the assembly of a hitherto unforeseen alternative MVA pathway that catalyzes sequential MVAP (3) decarboxylation and IP (4) phosphorylation resulting in the central hub metabolite of all organisms, the five-carbon isoprenoid building block IPP (1).
This may predict the participation of unforeseen actors to the pathways and provide an integrated view of the signalling mechanisms by assessing the existence of important interactions between them.
However, drug development is notoriously difficult: predictive models are theoretical and do not always withstand testing; animal models are an inexact facsimile of human biology; and targeting one part of a given pathway may have unforeseen effects elsewhere.
Recently, unforeseen cross-talks among different signaling pathways have been shown to affect several cellular responses both in embryogenesis and in oncogenesis.
The discovery of several prostaglandin synthases and of distinct prostaglandin receptors has unraveled an unforeseen diversity within the prostanoid synthetic pathway.
These unforeseen outcomes are due to differences in repair pathways choice; while haploid cells use the Rad6-dependent pathways that resumes stalled replication forks, diploid cells use the DSB repair pathways that depend on the Rad52 and MRX complex (Li and Tye 2011).
As indicated previously, metabolic engineering of metabolic pathways could cause unplanned and unforeseen deleterious effects on cellular function.
In recent years, the regulation of iron homeostasis has revealed its increasing complexity and its multifaceted and unforeseen interactions with a number of molecular pathways and processes.
One may be able to bypass this additional effect by targeting downstream effectors of the IGF-1R pathway, although these should also be tested for unforeseen side effects.
Genome sequencing will greatly expand this gene catalog, and may also uncover unforeseen targets for novel and specific acaricides, such as divergence in metabolic pathways between mites and bees or the discovery of important microbial interactions.
In the CCCI, other unforeseen biological processes are supported by genes codifying enzymes involved in metabolic pathways such as glycolysis and gluconeogenesis (community 6) and diverse groups of enzymes belonging to the cytochrome P450 and glutathione-S-transferases superfamilies (community 6 and 8).
