Date of Award
1-1-2011
Document Type
Masters Thesis
Degree Name
M.S.
Organizational Unit
Biological Sciences
First Advisor
Todd Blankenship, Ph.D.
Second Advisor
Daniel Linseman
Third Advisor
Scott Barbee
Fourth Advisor
Dinah Loerke
Keywords
Drosophila, Endocytosis, Exocyst complex, Rosette
Abstract
Convergent extension is a highly conserved process among mammals, in which the tissue narrows in one axis, and extends across another. Tissue elongation is directed by the regulation of cell interface behaviors, which guides cell intercalation and rosette formation. Rosette formation occurs through the contraction of vertically oriented cell interfaces, and the subsequent elongation of new horizontal interfaces. It has been shown that actomyosin-generated tension functions to direct rosette formation. In this thesis, I have tested the function of regulators of F-actin networks, as well as endocytic and exocytic mechanisms, to identify new components that control interface behaviors and cell shape. I have performed a screen of F-actin regulators and nucleators, and pinpointed the specific actin nucleator dPod-1 as a candidate protein that is localized to vertical interfaces during tissue elongation. Furthermore, I have probed the function of endocytosis using the Shibire mutation, and demonstrated that endocytosis is required for vertical interface shrinking. Finally, I have used mutations in components of the Exocyst Complex and the associated protein RalA to inhibit exocytic mechanisms, in order to address their function in directing cell and tissue morphologies.
Publication Statement
Copyright is held by the author. User is responsible for all copyright compliance.
Rights Holder
Amelia E. Zommer
Provenance
Received from ProQuest
File Format
application/pdf
Language
en
File Size
73 p.
Recommended Citation
Zommer, Amelia E., "Plasma Membrane Dynamics in the Drosophila Embryo" (2011). Electronic Theses and Dissertations. 961.
https://digitalcommons.du.edu/etd/961
Copyright date
2011
Discipline
Biology