AI Article Synopsis
- Notch and EGFR signaling pathways in Drosophila show an antagonistic relationship, influenced by the phosphorylation of the Notch signal transducer Su(H) by MAPK.
- Overexpressing different Su(H) variants (wild-type, phospho-deficient, and phospho-mimetic) in the wing anlagen revealed that the phospho-deficient variant elicited a stronger induction of Notch target genes than the wild-type, while the phospho-mimetic variant had a weak response.
- The study monitored impacts on various Notch target genes, finding that some were activated while one was repressed, and epistasis experiments with activated EGF-receptor and MAPK were conducted to analyze phenotypic outcomes in adult
Article Abstract
In Drosophila, Notch and EGFR signalling pathways are closely intertwined. Their relationship is mostly antagonistic, and may in part be based on the phosphorylation of the Notch signal transducer Suppressor of Hairless [Su(H)] by MAPK. Su(H) is a transcription factor that together with several cofactors regulates the expression of Notch target genes. Here we address the consequences of a local induction of three Su(H) variants on Notch target gene expression. To this end, wild-type Su(H), a phospho-deficient Su(H) (MAPK-) (ko) and a phospho-mimetic Su(H) (MAPK-ac) isoform were overexpressed in the central domain of the wing anlagen. The expression of the Notch target genes cut, wingless, E(spl)m8-HLH and vestigial, was monitored. For the latter two, reporter genes were used (E(spl)m8-lacZ, vg (BE) -lacZ). In general, Su(H) (MAPK-) (ko) induced a stronger response than wild-type Su(H), whereas the response to Su(H) (MAPK-ac) was very weak. Notch target genes cut, wingless and vg (BE) -lacZ were ectopically activated, whereas E(spl)m8-lacZ was repressed by overexpression of Su(H) proteins. In addition, in epistasis experiments an activated form of the EGF-receptor (DER (act) ) or the MAPK (rl (SEM) ) and individual Su(H) variants were co-overexpressed locally, to compare the resultant phenotypes in adult flies (thorax, wings and eyes) as well as to assay the response of the Notch target gene cut in cell clones.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4669530 | PMC |
| http://dx.doi.org/10.1016/j.dib.2015.11.004 | DOI Listing |
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