Convergent extension is a process that occurs in the development of a wide variety of organisms, including gastrulation in the Drosophila embryo to begin to lay out the adult body plan. In fly embryos, this is known as germband extension and is mainly driven by cell intercalation or neighbor exchange by planar polarized cell-cell interface contraction to shorten the tissue along the dorsal-ventral axis. In this thesis, I show that interface contraction consists of phases of fast interface shortening and intervals of stable interface size. My data also suggests that regulation of F-actin aggregates at these shrinking interfaces is important for appropriate biphasic interface contraction. Knock down of two F-actin regulating proteins, Dpod1 and coronin, results in aberrant interface dynamics and severe disruption of germband extension. Close examination of interface and F-actin aggregate dynamics in coronin knock down reveals that coronin is required for appropriate F-actin globule formation and interface contraction.
","abstract_html":"<p>Convergent extension is a process that occurs in the development of a wide variety of organisms, including gastrulation in the <em>Drosophila</em> embryo to begin to lay out the adult body plan. In fly embryos, this is known as germband extension and is mainly driven by cell intercalation or neighbor exchange by planar polarized cell-cell interface contraction to shorten the tissue along the dorsal-ventral axis. In this thesis, I show that interface contraction consists of phases of fast interface shortening and intervals of stable interface size. My data also suggests that regulation of F-actin aggregates at these shrinking interfaces is important for appropriate biphasic interface contraction. Knock down of two F-actin regulating proteins, Dpod1 and coronin, results in aberrant interface dynamics and severe disruption of germband extension. Close examination of interface and F-actin aggregate dynamics in coronin knock down reveals that coronin is required for appropriate F-actin globule formation and interface contraction.</p>","abstract_has_math":false,"creators":["Motlong, Ashley M."],"institution":null,"degree_name":"M.S.","degree_level":"Masters Thesis","degree_discipline":null,"degree_department":null,"school":null,"contributors":["James T. Blankenship, Ph.D.","Dinah Loerke","Scott Barbee"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013-01-01T08:00:00Z","date_published":"2013-01-01T08:00:00Z","updated_at":"2026-07-24T02:02:38Z","subjects":["Drosophila","Convergent extension","F-actin","Biochemistry, Biophysics, and Structural Biology","Life Sciences","Other Biochemistry, Biophysics, and Structural Biology"],"languages":["en"],"rights":["Copyright is held by the author. User is responsible for all copyright compliance.
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"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Regulation of Actin Dynamics During Drosophila Germband Extension"]}]}],"canonical_facts":{"dc:contributor":["James T. Blankenship, Ph.D.","Dinah Loerke","Scott Barbee"],"dc:creator":["Motlong, Ashley M."],"dc:date.available":["2001-01-01T08:00:00Z"],"dc:description.abstract":["Convergent extension is a process that occurs in the development of a wide variety of organisms, including gastrulation in the Drosophila embryo to begin to lay out the adult body plan. In fly embryos, this is known as germband extension and is mainly driven by cell intercalation or neighbor exchange by planar polarized cell-cell interface contraction to shorten the tissue along the dorsal-ventral axis. In this thesis, I show that interface contraction consists of phases of fast interface shortening and intervals of stable interface size. My data also suggests that regulation of F-actin aggregates at these shrinking interfaces is important for appropriate biphasic interface contraction. Knock down of two F-actin regulating proteins, Dpod1 and coronin, results in aberrant interface dynamics and severe disruption of germband extension. Close examination of interface and F-actin aggregate dynamics in coronin knock down reveals that coronin is required for appropriate F-actin globule formation and interface contraction.
"],"dc:format":["application/pdf"],"dc:identifier":["https://digitalcommons.du.edu/etd/457"],"dc:language":["en"],"dc:rights":["Copyright is held by the author. User is responsible for all copyright compliance.
"],"dc:subject":["Drosophila","Convergent extension","F-actin","Biochemistry, Biophysics, and Structural Biology","Life Sciences","Other Biochemistry, Biophysics, and Structural Biology"],"dc:title":["Regulation of Actin Dynamics During Drosophila Germband Extension"],"thesis:degree_level":["Masters Thesis"],"thesis:degree_name":["M.S."]},"updated_at":"2026-07-24T02:02:38Z"}