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Related Experiment Videos

Analyses of PS integrin functions during Drosophila development

S Zusman1, Y Grinblat, G Yee

  • 1Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge 02139.

Development (Cambridge, England)
|July 1, 1993
PubMed
Summary

Drosophila position-specific (PS) integrins are crucial for wing and eye development during pupation. Alternative splicing of the myospheroid (mys) gene is essential for embryonic development, indicating distinct roles for PS beta integrin subunits.

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Area of Science:

  • Developmental Biology
  • Cell Adhesion
  • Molecular Genetics

Background:

  • Drosophila position-specific (PS) antigens are homologous to vertebrate integrins, mediating cell-matrix and cell-cell adhesion.
  • The common beta subunit (PS beta) is encoded by the lethal(l)myospheroid (mys) gene, vital for wing, eye, and muscle development.

Purpose of the Study:

  • To investigate the developmental timing of PS integrin requirements in Drosophila.
  • To determine the functional significance of alternative splicing of the mys gene transcript.

Main Methods:

  • Expression of PS beta protein during specific developmental stages.
  • P element-mediated transformation to introduce transgenes with specific mys splice forms.

Main Results:

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  • PS integrins are required throughout pupation for wing development and in the late pupa for eye development, primarily for cell organization, not differentiation.
  • Either splice form of PS beta rescues postembryonic phenotypes, but both are necessary for rescuing embryonic mys defects.
  • Alternative splicing of mys is essential during embryogenesis, suggesting differential interactions of PS beta subunits.

Conclusions:

  • PS integrins play critical roles in Drosophila morphogenesis during pupal stages.
  • Alternative splicing of the mys gene is crucial for embryonic development, implying distinct functional roles for different PS beta integrin variants.