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Published on: January 12, 2015
PS2 integrin requirements in Drosophila embryo and wing morphogenesis
1Department of Biochemistry, University of Arizona, Tucson 85721.
Developmental Biology
|May 1, 1993
Summary
New Drosophila inflated (if) mutations reveal alpha PS2 integrin's crucial role in embryonic development and adult wing formation. Integrin function is essential throughout metamorphosis for proper wing morphogenesis.
Area of Science:
- Developmental Biology
- Genetics
- Cell Biology
Background:
- The Drosophila inflated (if) gene encodes the alpha PS2 subunit of PS integrins, essential cell adhesion molecules.
- Integrins play critical roles in embryonic development and tissue morphogenesis.
Purpose of the Study:
- To characterize new if mutations and investigate the spatial and temporal requirements of integrins during Drosophila development.
- To elucidate the function of alpha PS2 integrin in embryonic lethality and adult wing morphogenesis.
Main Methods:
- Generation and characterization of new if alleles (ifA7, ifB2).
- Analysis of embryonic lethal phenotypes, including muscle attachment and midgut morphogenesis.
- Clonal analysis to determine spatial requirements in wing development.
- Rescue experiments using a heat shock-inducible mys+ transgene to assess temporal requirements.
Main Results:
- New if alleles result in reduced alpha PS2 levels and exhibit embryonic lethal phenotypes similar to strong mutations affecting the beta PS integrin subunit (mys).
- if mutants display severe defects in somatic muscle attachments and midgut morphogenesis, but lack dorsal herniation seen in mys mutants.
- Clonal analysis shows if+ function is specifically required in the ventral wing surface cells for proper wing morphogenesis.
- Integrin function is necessary from early metamorphosis until the final 24-48 hours of wing development.
Conclusions:
- The Drosophila inflated (if) gene, encoding alpha PS2 integrin, is essential for embryonic viability and adult wing development.
- Alpha PS2 integrin plays distinct roles compared to beta PS integrin (mys) in embryonic development.
- Specific temporal and spatial requirements for integrin function exist during adult wing morphogenesis.
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