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Systematic analysis of RhoGAP expression and function in border cell morphology and migration.

Abhinava K Mishra1,2,3, Emily G Gemmill1,2, Joseph P Campanale1,2,4

  • 1Molecular, Cellular, and Developmental Biology Department University of California, Santa Barbara, CA 93106.

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Summary
This summary is machine-generated.

Diverse Rho GTPase-activating proteins (GAPs) are essential for controlling cell shape and movement. This study identifies key RhoGAPs in Drosophila border cells, revealing their critical roles in cell migration and morphology.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Rho family GTPases regulate cell morphology and behavior.
  • GTPase-activating proteins (GAPs) inactivate Rho GTPases.
  • A systematic analysis of GAPs in cell migration is needed.

Purpose of the Study:

  • To screen for RhoGAP expression and function in migratory Drosophila border cells.
  • To understand the role of negative regulation by GAPs in cell migration.
  • To define the contribution of RhoGAPs to cell morphology and motility.

Main Methods:

  • Screens for RhoGAP expression and function in Drosophila border cells.
  • Integration of single-cell RNAseq with published datasets.
  • RNAi knockdown and automated image analysis for morphology classification.
  • In-depth analysis of RhoGAPp190 function.

Main Results:

  • Most of the 22 RhoGAPs are expressed in border cells.
  • RNAi knockdown revealed most RhoGAPs are functionally required for migration.
  • RhoGAP perturbations altered border cell morphology.
  • Loss of RhoGAPp190 mimicked Rho hyperactivation; gain-of-function mimicked myosin II inhibition.

Conclusions:

  • Diverse RhoGAPs are crucial for spatiotemporal regulation of Rho GTPase activity.
  • Multiple RhoGAPs within a single cell type control cell morphology and motility.
  • Negative regulation by RhoGAPs is critical for cell migration.