Starvation-Signaling in the Nematode Caenorhabditis Elegans Using Regulator of G-Proteins GPB-2
dc.contributor.advisor | Galindo, Rene | en |
dc.contributor.committeeMember | Avery, Leon | en |
dc.contributor.committeeMember | Abrams, John M. | en |
dc.contributor.committeeMember | Castrillon, Diego H. | en |
dc.creator | Pollok, Robert Harding | en |
dc.date.accessioned | 2016-01-05T19:35:17Z | |
dc.date.available | 2016-01-05T19:35:17Z | |
dc.date.created | 2013-12 | |
dc.date.issued | 2013-08-30 | |
dc.date.submitted | December 2013 | |
dc.date.updated | 2016-01-05T19:07:35Z | |
dc.description.abstract | During starvation, C. elegans adjust their behavior in order to survive. Using the starvation-sensitive gpb-2(ad541) loss-of-function mutant, components in a starvation-signaling pathway were identified. The goals of the studies presented here were to identify neurons that propagate a starvation signal, and to identify genes that regulate fat storage in the gut during starvation. Starvation in gpb-2(ad541) worms is lethal, and this lethality can be induced by arecoline, an acetylcholine receptor antagonist. Starvation sensitivity in gpb-2(ad541) worms is inhibited by atropine, an acetylcholine receptor antagonist. Previous work suggests that cholinergic signaling propagates a starvation signal in the pharynx of the worm, and the MC neurons are responsible for sending that signal. By ablating the MC neurons in newly hatched L1 worms, I aimed to prevent starvation-induced lethality due to the gpb-2(ad541) background. Several genes have also been identified to act downstream of gpb-2 in the regulation of fat in the gut. Both flp-20 loss-of-function and mgl-2 loss-of-function mutations rescue the starvation-induced lethality of gpb-2(ad541), while introduction of a gcy-28 loss-of-function mutation restores lethality. When fat was assayed using Oil Red O, it was found that GCY-28, a receptor-type guanylate cyclase, is necessary to maintain fat levels during starvation. GCY-28 is expressed in various head neurons and throughout the gut, and GCY-28 may play a role in regulating how gut cells store fat. | en |
dc.format.mimetype | application/pdf | en |
dc.identifier.oclc | 933743767 | |
dc.identifier.uri | https://hdl.handle.net/2152.5/2727 | |
dc.language.iso | en | en |
dc.subject | Caenorhabditis elegans Proteins | en |
dc.subject | Cholinergic Agents | en |
dc.subject | Signal Transduction | en |
dc.subject | Starvation | en |
dc.title | Starvation-Signaling in the Nematode Caenorhabditis Elegans Using Regulator of G-Proteins GPB-2 | en |
dc.type | Thesis | en |
dc.type.material | text | en |
thesis.date.available | 2016-01-01 | |
thesis.degree.department | Graduate School of Biomedical Sciences | en |
thesis.degree.discipline | Genetics and Development | en |
thesis.degree.grantor | UT Southwestern Medical Center | en |
thesis.degree.level | Doctoral | en |
thesis.degree.name | Doctor of Philosophy | en |
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