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    MicroRNAs Protect the Robustness of Distal Tip Cell Migrations from Temperature Changes in Caenorhabditis elegans: A Dissertation

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    Authors
    Burke, Samantha L.
    Faculty Advisor
    Victor Ambros, PhD
    Academic Program
    Interdisciplinary Graduate Program
    UMass Chan Affiliations
    Program in Molecular Medicine
    Document Type
    Doctoral Dissertation
    Publication Date
    2015-08-03
    Keywords
    Dissertations, UMMS
    MicroRNAs
    Caenorhabditis elegans
    Cell Movement
    Temperature
    MicroRNAs
    Caenorhabditis elegans
    Cell Movement
    Temperature
    Developmental Biology
    Genetics and Genomics
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    Abstract
    MicroRNAs play an important role in protecting biological robustness during development. Biological robustness is the ability to maintain a consistent output despite variation in input, such as transcriptional noise or environmental stresses. Here, we show that the conserved microRNAs mir-34 and mir-83 promote the robust migration of the distal tip cells in Caenorhabditis elegans when stressed by changing environmental temperature. Our results show that distal tip cell migration is sensitive to temperature changes occurring within a two hour period during the first larval stage. mir-34 and mir-83 protect distal tip cell migration by regulating potential targets cdc-42, pat-3, and peb-1. cdc-42 and pat-3 are known components of the integrin signaling network controlling pathfinding during migration, while the involvement of peb-1 is a novel finding. Additionally, loss of the two microRNAs leads to a reduction in both fecundity and lifespan, suggesting that the loss of developmental robustness leads to a decrease in fitness. mir-34 and mir-83 are not only conserved in higher organisms, but duplicated. Both have been implicated as tumor suppressor genes in mammalian work. Our work has found a role for both microRNAs in integrin-regulated cell migrations that is potentially conserved in higher organisms. Additionally, our work supports the growing appreciation for the role of microRNAs in both stress response and promoting developmental robustness.
    DOI
    10.13028/M28W2B
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/32149
    Rights
    Copyright is held by the author, with all rights reserved.
    ae974a485f413a2113503eed53cd6c53
    10.13028/M28W2B
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