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High-probability grants
According to our matching algorithm, Lavinia Sheets is the likely recipient of the following grants.
Years |
Recipients |
Code |
Title / Keywords |
Matching score |
2004 — 2006 |
Sheets, Lavinia |
F31Activity Code Description: To provide predoctoral individuals with supervised research training in specified health and health-related areas leading toward the research degree (e.g., Ph.D.). |
Regulation of Molecular Motors in Zebrafish @ Oregon Health and Science University
DESCRIPTION (provided by applicant): A growing number of diseases, including neuropathology and developmental disorders, are thought to result from disrupted transport of organelles. Melanosome transport in pigment cells is an ideal model system for studying the molecular mechanisms of organelle transport. We propose to examine the regulation of molecular motor proteins by applying genetics to the problem of melanosome transport in zebrafish melanophores. This will be accomplished by participating in two on going mutagenesis screens and screening zebrafish mutants specifically for alterations in melanosome dynamics. Mutants of interest will then be further examined by isolating their melanophores and, via live cell imaging, characterizing their defects in pigment transport through an assay system we have developed. Once we have identified mutants that are defective in microtubule pigment transport we will clone the genes responsible and examine their role in regulating motor activity.
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0.93 |
2017 — 2021 |
Sheets, Lavinia |
R01Activity Code Description: To support a discrete, specified, circumscribed project to be performed by the named investigator(s) in an area representing his or her specific interest and competencies. |
Roles of the Synapse in Hair-Cell Pathology
Project Summary: Loud or extended noise exposure damages cochlear hair cells often resulting in either loss of synaptic connections with auditory nerve fibers or hair-cell death. One mechanism for this damage occurs through overstimulation of hair cells, which leads to a surge of Ca2+ at hair-cell synapses, metabolic stress on the hair cell, and excessive release of the neurotransmitter glutamate. The overall goal of this proposal is to understand how pathological changes at the hair-cell synapse stemming from excessive noise exposure ultimately contribute to noise-induced damage. Our objectives are to 1) test the hypothesis that hair-cell overstimulation triggers synaptic-ribbon loss, 2) determine the role of glutamate signaling in hair-cell pathology and repair of acoustic overexposure, and 3) identify the downstream effectors of glutamate-receptor mediated hair-cell death. Current gaps in our understanding of how hair-cell synapse overstimulation contributes to hair- cell damage are in large part due our inability to follow the time course of dynamic intracellular processes in noise-exposed hair cells and to separate glutamate induced damage to hair-cells versus innervating nerve terminals in mammalian cochlea. This project will circumvent these issues by investigating noise-induced hair-cell damage using live-cell imaging, tissue-specific genetic ablation, and pharmacological tools in the zebrafish lateral line? a mechanosensory organ which is made up of clusters of innervated hair cells. Zebrafish lateral-line hair cells are similar to mammalian hair cells at the molecular and cellular level, but are pharmacologically and optically accessible within the whole larvae. This feature allows for direct environmental manipulation and phenotypic observations in a live, intact preparation, which is currently not feasible in the mammalian cochlea. The results of each of our objectives will reveal how specific pathological changes at hair-cell synapses contribute to multiple pathologies resulting from excess noise exposure, thereby furthering our understanding of the underlying causes of sensorineural hearing loss.
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1 |