All this biosynthetic pathways are completely functional in S. glossinidius.
Our findings do not, however, necessarily imply that the trajectories of white matter pathways are completely predetermined.
Most of these pathways are completely or highly overlapped and actually belong to two pathways: microbial metabolism in diverse environments and biosyntheses of secondary metabolites.
In addition to DHA, H. walsbyi can grow on glycerol and pyruvate [ 3] but also on amino acids [ 4] for which all biosynthesis pathways are completely present.
Even when metabolic pathways are completely modular (so that there are limited or absent diminishing returns) there can be a constant one-time cost of switching the metabolic pathway to a different resource.
Importantly, while Slt2 MAPK is known to play a role in the cell wall integrity (CWI) pathway, we found that the ERSU and CWI pathways are completely distinct (Babour et al., 2010; Levin, 2011).
The authors conclude that both mediators and promediators are removed at interstitial and at tissue levels, secondary to removal from blood compartment, to a point where some pathways are completely shut down and cascades are blocked.
Nutlin-3a-induced apoptosis and senescence were firmly dependent on the presence of functional p53, as revealed by the fact that glioblastoma cells with knockdown p53 with specific siRNA, or cells with mutated or functionally impaired p53 pathway, were completely insensitive to the drug.
