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Metabolic Inflexibility in Response to Lipid Oversupply with Obesity: Epigenetic Modifications Play a Role
(East Carolina University, 2013)
The ability to adjust substrate oxidation according to nutrient availability has been termed `metabolic flexibility' and is a critical factor in overall metabolic health. In respect to fatty acid oxidation (FAO) metabolic ...
The Influence of Energy Expenditure on Mitochondrial Functions, Oxidative Stress and Insulin Resistance under Metabolic Oversupply Conditions
(East Carolina University, 2011)
Mitochondrial respiratory capacity and oxidative stress have been implicated in the development of insulin resistance (IR) and type II diabetes. A causative role of mitochondrial oxidative stress in the etiology of ...
RNA polymerase II CTD Evolutionary Diversity and Associated Protein Identification in Green and Red Algae
(East Carolina University, 2014)
In model eukaryotes, the C-terminal domain (CTD) of the largest subunit (RPB1) of DNA-dependent RNA polymerase II is composed of tandemly repeated heptads with the consensus sequence YSPTSPS. Both the core motif and tandem ...
The unique roles of IFE-1, a germline-specific isoform of eukaryotic translation factor 4E, during gametogenesis
(East Carolina University, 2009)
Fertility and embryonic viability are measures of efficient germ cell growth and differentiation. During oogenesis, spermatogenesis and embryogenesis cells initially proliferate then differentiate into specific tissues. New proteins are required for both cell growth and differentiation, requiring qualitative and quantitative changes in protein synthesis. During late gametogenesis and early embryogenesis the expression of the appropriate proteins is a primarily due to translational control. Translational control of mRNAs is mediated in part by eukaryotic initiation factor 4E (eIF4E). eIF4E binds the methylated 5' cap of mRNA and recruits it to the ribosome. The nematode worm C.elegans expresses five isoforms of eIF4E (termed IFE-1 through 5). IFE-1 is expressed primarily in the germline and is the only isoform that associates with P granules by binding directly to PGL-1. P granules are ribonucleoprotein particles (RNPs) that contain stored mRNAs and proteins needed for oogenesis and early embryogenesis. Using a strain that lacks IFE-1, I assessed the translational efficiency of maternal mRNAs bound and not bound to P granules by polysome fractionation. Translation of pos-1, pal-1, mex-1, oma-1, ced-4 and glp-1 mRNAs was inefficient in the ife-1 strain relative to wild type worms. GAPDH (gpd-3) mRNA translation was not affected. We also observed differences in the pattern of expression of the MEX-1 protein during oogenesis. In males, secondary spermatocytes failed to complete cytokinesis at 25°C in absence of IFE-1. Males deficient of IFE-1 therefore lacked mature sperm. In addition, ife-1 spermatocytes prematurely accumulated pro-apoptotic CED-4, homolog to mammalian Apaf-1, during spermatogenesis. In ife-1 worms fertility was decreased by 80% due to decreased viability of both oocytes and spermatocytes. Our data indicate two unique roles for eIF4E (IFE-1 isoform) in late oogenesis and spermatogenesis. We suggest that IFE-1 preferentially recruits regulated mRNAs at critical times during germ cell development. ...
Effects of obesity on the transcriptional regulation of protein degradation in skeletal muscle
(East Carolina University, 2013)
Effects of obesity on the transcriptional regulation of protein degradation in skeletal muscle by Lance M. Bollinger November, 2013 Director of Thesis/Dissertation: Jeffrey J. Brault Major Department: Kinesiology ...
Novel diagnostic and analytical applications of benchtop time-domain NMR.
(East Carolina University, 2015)
High-resolution nuclear magnetic resonance (NMR) spectroscopy is a powerful technique, yet practical application outside of the research laboratory has been limited due to the high cost and complexity of the instrumentation. ...
The involvement of cap-independent mRNA translation in cell fate decisions
(East Carolina University, 2014)
During cell stress many biochemical processes are shut down. For
example, global mRNA translation initiation is inhibited due to the
disruption of the cap-dependent mRNA recruitment mechanism. One
specific example of ...
Selective Recruitment of Germ Cell mRNAs by eIF4 Factors
(East Carolina University, 1/13/16)
During germ line development critical steps in the proliferation and differentiation of stem cells into oocytes and sperm are regulated by mRNA translational control. This regulation changes the subset of proteins being ...
N-3 polyunsaturated fatty acids differentially enhance B-cell mediated immunity in lean and obese mice
(East Carolina University, 2014)
Docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) are
bioactive n-3 polyunsaturated fatty acids (PUFAs) in fish oil that
exert immunomodulatory effects. The general paradigm suggests n-3
PUFAs exert immunosuppressive ...
Multiple Translation Factor eIF4G (IFG-1) Isoforms are Required for the Apoptosome-Dependent Activation of Germ Cell Apoptosis
(East Carolina University, 2010)
Apoptosis is a naturally occurring process during animal development required for the programmed killing and removal of injured cells. Cellular insult induces a switch in translation that allows for the rapid synthesis ...