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Methods to Examine the Lymph Gland and Hemocytes in Drosophila Larvae
Published on: November 28, 2016
JAK/Stat signaling regulates heart precursor diversification in Drosophila
Aaron N Johnson1, Mayssa H Mokalled, Tom N Haden
1Department of Molecular Biology, UT Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, TX 75390-9148, USA.
Development (Cambridge, England)
|October 4, 2011
Summary
The Janus kinase/Signal transducer and activator of transcription (JAK/Stat) pathway regulates heart development in flies by controlling Tinman expression. This pathway is crucial for proper heart precursor cell diversification and function.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Intercellular signal transduction pathways are vital for cardiogenesis.
- The NK-2 family of transcription factors is regulated by conserved gene networks in flies and mammals.
- The Drosophila NK-2 protein Tinman (Tin) interacts with the JAK/Stat pathway.
Purpose of the Study:
- To systematically characterize the role of the JAK/Stat pathway in Drosophila mesoderm development and cardiogenesis.
- To elucidate the regulatory mechanisms by which JAK/Stat signaling influences heart formation.
Main Methods:
- Utilized Drosophila melanogaster as a model organism.
- Employed genetic mutations in JAK/Stat pathway components (upd, Stat92E) and E(spl)-C genes.
- Analyzed gene expression patterns (tin, HLHm5, H15) during embryogenesis.
- Observed cardiac morphology and cell aggregation defects.
Main Results:
- Mutations in upd or Stat92E lead to non-functional hearts with defects in lumen formation and cell aggregation.
- The JAK/Stat pathway regulates tin expression timing and spatial restriction during mesoderm development.
- JAK/Stat signaling activates E(spl)-C genes, which in turn restrict Tin expression and H15 expression, directing heart precursor diversification.
- E(spl)-C mutant embryos exhibit cardiac defects similar to Stat92E mutants.
Conclusions:
- The JAK/Stat pathway plays a critical, previously uncharacterized role in Drosophila cardiogenesis.
- JAK/Stat signaling acts upstream of Tinman expression regulation.
- Identified a novel autoregulatory circuit where Tinman expression limits its own domain via JAK/Stat-mediated activation of E(spl)-C genes.
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