Tbx1 has been shown to regulate, directly or indirectly, several of the major signaling systems, i.e. the fibroblast growth factor (FGF) signaling [7], [10], [30], [31], the Retinoic acid signaling [12], [31], the Delta-Notch1 signaling [32] and the BMP/Smad1 signaling (this work).
However, it is clear that major signaling systems, such as the fibroblast growth factor (FGF) and bone morphogenetic protein (BMP), as well as transcription factors such Nkx2.5, Isl1, Tbx1 and Foxh1 contribute to specification, proliferation and/or maintenance of this population [15].
In fact the Hh pathway is one of the four major signaling systems that are controlling the major developmental processes.
Functional classifications furthermore indicated that several major signaling systems such as the Wnt/β-catenin pathway were affected by butyrate treatment.
TCS are major signaling systems in bacteria; they typically consist of a histidine kinase (HK) that senses external environmental signals and a response regulator (RR) that triggers the cellular response after being activated by its cognate HK.
Two of the aberrations discovered in the new study were in genes used in a major signaling system in the brain, giving clues to processes that might go awry and suggestions of how to treat the diseases.
A major signaling system regulating chondrocyte proliferation and maturation is controlled by PTHrP, which is induced by Indian hedgehog, stimulates chondrocyte proliferation and delays maturation through the PTHrP receptor PTHR1 [for reviews see (Kronenberg et al. 1998; Vortkamp 2000)].
Therefore, we expect that adiponectin induces iNOS and MMP expression via JNK downstream to AMPK in human chondrocytes and that the AMPK/JNK axis is a major signaling system responsible for the adiponectin-induced degradation of cartilage matrix.
For example, by targeting the wing margin and eye, these methods were used to identify novel genes that contribute to the Notch pathway, a major signaling system of metazoans (Hall et al. 2004; Alexander et al. 2006; Kankel et al. 2007; Shalaby et al. 2009).
IKK-2 is a significant component of the nuclear factor-κB (NF-κB) signalling pathway, and it was shown that within its activation loop IKK-2 contains an evolutionarily conserved LxxLAP consensus motif for hydroxylation by PHD, thus linking two major human signalling systems, namely NF-κB and HIF.
