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Live-cell Imaging of Sensory Organ Precursor Cells in Intact Drosophila Pupae
Published on: May 27, 2011
Drosophila nemo is an essential gene involved in the regulation of programmed cell death
Ivana Mirkovic1, Kristi Charish, Sharon M Gorski
1Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada.
Abstract:
Nemo-like kinases define a novel family of serine/threonine kinases that are involved in integrating multiple signaling pathways. They are conserved regulators of Wnt/Wingless pathways, which may coordinate Wnt with TGFbeta-mediated signaling. Drosophila nemo was identified through its involvement in epithelial planar polarity, a process regulated by a non-canonical Wnt pathway. We have previously found that ectopic expression of Nemo using the Gal4-UAS system resulted in embryonic lethality associated with defects in patterning and head development. In this study we present our analyses of the phenotypes of germline clone-derived embryos. We observe lethality associated with head defects and reduction of programmed cell death and conclude that nmo is an essential gene. We also present data showing that nmo is involved in regulating apoptosis during eye development, based on both loss of function phenotypes and on genetic interactions with the pro-apoptotic gene reaper. Finally, we present genetic data from the adult wing that suggest the activity of ectopically expressed Nemo can be modulated by Jun N-terminal kinase (JNK) signaling. Such an observation supports the model that there is cross-talk between Wnt, TGFbeta and JNK signaling at multiple stages of development.
Insights
Nemo-like kinases (NLKs) are essential for embryonic development, regulating cell death and patterning. Drosophila nemo loss-of-function causes lethality and head defects, highlighting its crucial role in developmental signaling pathways.
Area of Science:
- Developmental Biology
- Molecular Genetics
- Cell Signaling
Background:
- Nemo-like kinases (NLKs) are a novel serine/threonine kinase family involved in integrating signaling pathways.
- NLKs are conserved regulators of Wnt/Wingless pathways, potentially coordinating Wnt with TGFbeta signaling.
- Drosophila nemo was initially identified in epithelial planar polarity, regulated by a non-canonical Wnt pathway.
Purpose of the Study:
- To analyze the developmental phenotypes of germline clone-derived Drosophila nemo (nmo) embryos.
- To investigate the role of nmo in regulating programmed cell death during eye development.
- To explore potential cross-talk between NLK signaling and other developmental pathways like JNK.
Main Methods:
- Analysis of embryonic lethality and head development defects in germline clone-derived embryos.
- Assessment of apoptosis regulation in eye development using loss-of-function nmo phenotypes.
- Genetic interaction studies with the pro-apoptotic gene reaper.
- Examination of adult wing phenotypes to investigate modulation of ectopic Nemo activity by Jun N-terminal kinase (JNK) signaling.
Main Results:
- Germline clone-derived nmo embryos exhibit lethality, head defects, and reduced programmed cell death, confirming nmo as an essential gene.
- nmo plays a role in regulating apoptosis during eye development, evidenced by loss-of-function phenotypes and genetic interactions.
- Ectopic Nemo activity in adult wings can be modulated by JNK signaling, suggesting pathway cross-talk.
Conclusions:
- Drosophila nemo is essential for embryonic development, regulating patterning and programmed cell death.
- nmo is implicated in the control of apoptosis during eye development.
- Evidence supports cross-talk between Wnt, TGFbeta, and JNK signaling pathways during development, with NLKs potentially mediating these interactions.
