mir-71 mediates age-dependent opposing contributions of the stress activated kinase KGB-1 inCaenorhabditis elegans
| Autor: | Michael Y. Shapira, Cyrus Ruediger |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0303 health sciences
biology Argonaute biology.organism_classification Cell biology 03 medical and health sciences 0302 clinical medicine Downregulation and upregulation Pleiotropy microRNA Gene Transcription factor 030217 neurology & neurosurgery Caenorhabditis elegans Function (biology) 030304 developmental biology |
| DOI: | 10.1101/835355 |
| Popis: | Studying the evolutionary processes that shaped aging offers a path for understanding the causes of aging. The Antagonistic Pleiotropy theory for the evolution of aging proposes that the inverse correlation between natural selection strength and aging allows positive selection of gene variants with early-life beneficial contributions to fitness in spite of detrimental late-life consequences. However, mechanistic understanding of how this principle manifests in aging is still lacking. We previously identified antagonistic pleiotropy in the function of theCaenorhabditis elegansJNK homolog KGB-1, which provided stress protection in developing larvae, but sensitized adults to stress and shortened their lifespan. To a large extent, KGB-1’s contributions depended on age-dependent and opposing regulation of the stress transcription factor DAF-16, but the underlying mechanisms remained unknown. Here we describe a role for the microRNA mir-71 in mediating effects of KGB-1 on DAF-16 and on downstream phenotypes. Fluorescent imaging along with genetic and survival analyses revealed age-dependent regulation ofmir-71expression by KGB-1 – upregulation in larvae, but downregulation in adults, and showed thatmir-71was required both for late-life effects of KGB-1 (infection sensitivity and shortened lifespan), as well as for early life resistance to cadmium. Whilemir-71disruption did not compromise development under protein folding stress (known to depend on KGB-1), disruption of the argonaute genealg-1, a central component of the microRNA machinery, did. These results suggest that microRNAs play a role in mediating age-dependent antagonistic contributions of KGB-1 to survival, with mir-71 playing a central role and additional microRNAs contributing redundantly. |
| Databáze: | OpenAIRE |
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