Researcher:
Dunn, Cory David

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Cory David

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Dunn

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Dunn, Cory David

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2010 - 201918

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Now showing 1 - 10 of 18
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    Running on empty: Does mitochondrial DNA mutation limit replicative lifespan in yeast? Mutations that increase the division rate of cells lacking mitochondrial DNA also extend replicative lifespan in Saccharomyces cerevisiae
    (Wiley, 2011) Department of Molecular Biology and Genetics; Dunn, Cory David; Other; Department of Molecular Biology and Genetics; College of Sciences; N/A
    Mitochondrial DNA (mtDNA) mutations escalate with increasing age in higher organisms. However, it has so far been difficult to experimentally determine whether mtDNA mutation merely correlates with age or directly limits lifespan. A recent study shows that budding yeast can also lose functional mtDNA late in life. Interestingly, independent studies of replicative lifespan (RLS) and of mtDNA-deficient cells show that the same mutations can increase both RLS and the division rate of yeast lacking the mitochondrial genome. These exciting, parallel findings imply a potential causal relationship between mtDNA mutation and replicative senescence. Furthermore, these results suggest more efficient methods for discovering genes that determine lifespan.
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    Deep mutational scanning reveals characteristics important for mitochondrial targeting of a tail-anchored protein.
    (The American Society for Cell Biology, 2017) N/A; N/A; N/A; Department of Molecular Biology and Genetics; Keskin, Abdurrahman; Akdoğan, Emel; Dunn, Cory David; Master Student; Master Student; Other; Department of Molecular Biology and Genetics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; N/A
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    Defects associated with mitochondrial DNA damage can be mitigated by increased vacuolar pH in Saccharomyces cerevisiae
    (Genetics Soc Am, 2013) N/A; Department of Molecular Biology and Genetics; Garipler, Görkem; Dunn, Cory David; Master Student; Other; Department of Molecular Biology and Genetics; Graduate School of Sciences and Engineering; College of Sciences; N/A
    While searching for mutations that alleviate detrimental effects of mitochondrial DNA (mtDNA) damage, we found that disrupting vacuolar biogenesis permitted survival of a sensitized yeast background after mitochondrial genome loss. Furthermore, elevating vacuolar pH increases proliferation after mtDNA deletion and reverses the protein import defect of mitochondria lacking DNA.
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    Loss of Mgr2P destabilizes the TIM23 channel and reduces mitochondrial emission of reactive oxygen species
    (Cell Press, 2019) Mirzalieva, Oygul; Jeon, Shinhye; Damri, Kevin; Hartke, Ruth; Drwesh, Layla; Demishtein-Zohary, Keren; Azem, Abdussalam; Peixoto, Pablo M.; Department of Molecular Biology and Genetics; Dunn, Cory David; Other; Department of Molecular Biology and Genetics; College of Sciences; N/A
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    Nutrient-sensing signaling pathways determine the outcome of mitochondrial dysfunction
    (Wiley-Blackwell, 2014) Department of Molecular Biology and Genetics; N/A; N/A; N/A; N/A; Dunn, Cory David; Garipler, Görkem; Mutlu, Nebibe; Lack, Nathan Alan; Other; Master Student; Master Student; Faculty Member; Department of Molecular Biology and Genetics; College of Sciences; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; School of Medicine; N/A; N/A; N/A; 120842
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    The endoplasmic reticulum-mitochondria encounter structure complex coordinates coenzyme q biosynthesis
    (Sage, 2019) Eisenberg-Bord, Michal; Tsui, Hui S.; Antunes, Diana; Fernández-Del-Río, Lucía; Bradley, Michelle C; Nguyen, Theresa; Rapaport, Doron; Clarke, Catherine F; Schuldiner, Maya; Department of Molecular Biology and Genetics; Dunn, Cory David; Other; Department of Molecular Biology and Genetics; College of Sciences; N/A
    Loss of the endoplasmic reticulum (ER)-mitochondria encounter structure (ERMES) complex that resides in contact sites between the yeast ER and mitochondria leads to impaired respiration; however, the reason for that is not clear. We find that in ERMES null mutants, there is an increase in the level of mRNAs encoding for biosynthetic enzymes of coenzyme Q6 (CoQ6), an essential electron carrier of the mitochondrial respiratory chain. We show that the mega complexes involved in CoQ6 biosynthesis (CoQ synthomes) are destabilized in ERMES mutants. This, in turn, affects the level and distribution of CoQ6 within the cell, resulting in reduced mitochondrial CoQ6. We suggest that these outcomes contribute to the reduced respiration observed in ERMES mutants. Fluorescence microscopy experiments demonstrate close proximity between the CoQ synthome and ERMES, suggesting a spatial coordination. The involvement of the ER-mitochondria contact site in regulation of CoQ6 biogenesis highlights an additional level of communication between these two organelles.
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    Evidence for amino acid snorkeling from a high-resolution, in vivo analysis of FIS1 tail-anchor insertion at the mitochondrial outer membrane
    (Genetics Society America, 2017) N/A; N/A; N/A; Department of Molecular Biology and Genetics; Keskin, Abdurrahman; Akdoğan, Emel; Dunn, Cory David; Master Student; Master Student; Other; Department of Molecular Biology and Genetics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; N/A
    Proteins localized to mitochondria by a carboxyl-terminal tail anchor (TA) play roles in apoptosis, mitochondrial dynamics, and mitochondrial protein import. To reveal characteristics of TAs that may be important for mitochondrial targeting, we focused our attention upon the TA of the Saccharomyces cerevisiae Fis1 protein. Specifically, we generated a library of Fis1p TA variants fused to the Gal4 transcription factor, then, using next-generation sequencing, revealed which Fis1p TA mutations inhibited membrane insertion and allowed Gal4p activity in the nucleus. Prompted by our global analysis, we subsequently analyzed the ability of individual Fis1p TA mutants to localize to mitochondria. Our findings suggest that the membrane-associated domain of the Fis1p TA may be bipartite in nature, and we encountered evidence that the positively charged patch at the carboxyl terminus of Fis1p is required for both membrane insertion and organelle specificity. Furthermore, lengthening or shortening of the Fis1p TA by up to three amino acids did not inhibit mitochondrial targeting, arguing against a model in which TA length directs insertion of TAs to distinct organelles. Most importantly, positively charged residues were more acceptable at several positions within the membrane-associated domain of the Fis1p TA than negatively charged residues. These findings, emerging from the first high-resolution analysis of an organelle targeting sequence by deep mutational scanning, provide strong, in vivo evidence that lysine and arginine can "snorkel," or become stably incorporated within a lipid bilayer by placing terminal charges of their side chains at the membrane interface.
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    Vacuolar pH can dictate the consequences of mitochondrial dna damage
    (Wiley-Blackwell, 2013) Department of Molecular Biology and Genetics; N/A; Dunn, Cory David; Garipler, Görkem; Other; Master Student; Department of Molecular Biology and Genetics; College of Sciences; Graduate School of Sciences and Engineering; N/A; N/A
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    PublicationOpen Access
    A bacteria-derived tail anchor localizes to peroxisomes in yeast and mammalian cells
    (Nature Publishing Group (NPG), 2018) Seferoğlu, Ayşe Bengisu; Department of Molecular Biology and Genetics; Dunn, Cory David; Keskin, Abdurrahman; Akdoğan, Emel; Lutfullahoglu-Bal, Guleycan; Department of Molecular Biology and Genetics; College of Sciences
    Prokaryotes can provide new genetic information to eukaryotes by horizontal gene transfer (HGT), and such transfers are likely to have been particularly consequential in the era of eukaryogenesis. Since eukaryotes are highly compartmentalized, it is worthwhile to consider the mechanisms by which newly transferred proteins might reach diverse organellar destinations. Toward this goal, we have focused our attention upon the behavior of bacteria-derived tail anchors (TAs) expressed in the eukaryote Saccharomyces cerevisiae. In this study, we report that a predicted membrane-associated domain of the Escherichia coli YgiM protein is specifically trafficked to peroxisomes in budding yeast, can be found at a pre-peroxisomal compartment (PPC) upon disruption of peroxisomal biogenesis, and can functionally replace an endogenous, peroxisome-directed TA. Furthermore, the YgiM(TA) can localize to peroxisomes in mammalian cells. Since the YgiM(TA) plays no endogenous role in peroxisomal function or assembly, this domain is likely to serve as an excellent tool allowing further illumination of the mechanisms by which TAs can travel to peroxisomes. Moreover, our findings emphasize the ease with which bacteria-derived sequences might target to organelles in eukaryotic cells following HGT, and we discuss the importance of flexible recognition of organelle targeting information during and after eukaryogenesis.
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    Activation of the pleiotropic drug resistance pathway can promote mitochondrial DNA retention by fusion-defective mitochondria in saccharomyces cerevisiae
    (Genetics Society America (GSA), 2014) Department of Chemical and Biological Engineering; Dunn, Cory David; Mutlu, Nebibe; Garipler, Görkem; Akdoğan, Emel; Faculty Member; Department of Chemical and Biological Engineering; College of Sciences
    Genetic and microscopic approaches using Saccharomyces cerevisiae have identified many proteins that play a role in mitochondrial dynamics, but it is possible that other proteins and pathways that play a role in mitochondrial division and fusion remain to be discovered. Mutants lacking mitochondrial fusion are characterized by rapid loss of mitochondrial DNA. We took advantage of a petite-negative mutant that is unable to survive mitochondrial DNA loss to select for mutations that allow cells with fusion-deficient mitochondria to maintain the mitochondrial genome on fermentable medium. Nextgeneration sequencing revealed that all identified suppressor mutations not associated with known mitochondrial division components were localized to PDR1 or PDR3, which encode transcription factors promoting drug resistance. Further studies revealed that at least one, if not all, of these suppressor mutations dominantly increases resistance to known substrates of the pleiotropic drug resistance pathway. Interestingly, hyperactivation of this pathway did not significantly affect mitochondrial shape, suggesting that mitochondrial division was not greatly affected. Our results reveal an intriguing genetic connection between pleiotropic drug resistance and mitochondrial dynamics.