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Rap1 promotes epithelial integrity and cell viability in a growing tissue
C Luke Messer1, Jocelyn A McDonald1
1Division of Biology, Kansas State University, Manhattan, KS, 66506, USA.
Developmental Biology
|June 3, 2023
Summary
The small GTPase Rap1 maintains epithelial integrity and cell survival during Drosophila oogenesis. Loss of Rap1 disrupts tissue shape and cell adhesion, impacting embryonic development.
Area of Science:
- Developmental Biology
- Cell Biology
- Epithelial Biology
Background:
- Epithelial tissues are crucial for development and homeostasis.
- Maintaining epithelial integrity during growth and stress is poorly understood.
- The small GTPase Rap1 regulates cell polarity and junctions.
Purpose of the Study:
- Investigate the role of Rap1 in epithelial integrity and tissue shape during Drosophila oogenesis.
- Determine Rap1's function in maintaining cell survival and E-cadherin localization.
- Understand Rap1's contribution to epithelial development in a growing tissue.
Main Methods:
- Genetic manipulation of Rap1 activity in Drosophila.
- Analysis of epithelial integrity, cell shape, and cell survival.
- Assessment of E-cadherin localization and apoptotic pathways.
Main Results:
- Loss of Rap1 disrupted follicle cell epithelium and egg chamber shape during growth.
- Rap1 is essential for E-cadherin localization and epithelial cell survival.
- Myo-II and α-Catenin affect egg chamber shape but not cell viability.
- Rap1 inhibition led to increased cell death, loss of polar cells, and impaired border cell migration.
Conclusions:
- Rap1 has dual roles in maintaining epithelial integrity and cell survival during Drosophila oogenesis.
- Rap1 is critical for proper tissue shape and barrier function in developing epithelia.
- Understanding Rap1's function provides insights into epithelial development and homeostasis.
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