DNA methylation is an epigenetic hallmark that has been studied intensively in mammals and plants. However, knowledge of this phenomenon in unicellular organisms is scanty. Examining epigenetic regulation, and more specifically DNA methylation, in these organisms represents a unique opportunity to better understand their biology. The determination of their methylation status is often complicated by the presence of several differentiation stages in their life cycle. This article focuses on some recent advances that have revealed the unexpected nature of the epigenetic determinants present in protozoa. The role of the enigmatic DNA methyltransferase Dnmt2 in unicellular organisms is discussed.
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http://dx.doi.org/10.1016/j.pt.2008.02.002 | DOI Listing |
Environ Microbiol
January 2025
Trivedi School of BioSciences and Koita Centre for Digital Health, Ashoka University, Sonipat, India.
Evolutionary novelty has been one of the central themes in the field of evolutionary biology for many years. Structural and functional innovations such as scales in the reptiles, fins in the fishes and mammary glands in the mammals have been the focus of the studies. Insights obtained from these studies have shaped the criterion for the identification of novelty as well as provide the framework for studying novelty.
View Article and Find Full Text PDFJ Eukaryot Microbiol
January 2025
Laboratory of Cytology of Unicellular Organisms, Institute of Cytology of the Russian Academy of Sciences, St. Petersburg, Russia.
The genus Pelomyxa includes 15 species of anaerobic Archamoebae with remarkable diverse nucleoplasm morphology. Nuclear structures, like chromatin and nucleoli, of several members of the genus was previously identified only based on their ultrastructural similarity to typical structures of somatic cells of higher eukaryotes. Here, we explored an easy-to-use, one-step intravital staining method with DAPI and pyronin to distinguish between DNA and RNA structures in nuclei of unfixed cells of Pelomyxa belevskii and P.
View Article and Find Full Text PDFProtist
January 2025
Chiba Institute of Science, 3 Shiomi-cho, Choshi, Chiba 288-0025, Japan. Electronic address:
Stentor pyriformis is a unicellular organism whose inherent green-algal symbionts can be utilized in evolutionary and cytological studies. The cytoplasm contains symbiotic algae and starch granules, which are in constant motion. The habitats of the ciliate S.
View Article and Find Full Text PDFLife (Basel)
January 2025
Department of Biology, University of Crete, Voutes University Campus, GR-70013 Heraklion, Crete, Greece.
This study investigates the resilience of the unicellular green microalga to extreme atmospheric conditions simulating those of Mars, Jupiter, and Titan. Using Earth as a control, experiments were conducted under autotrophic and mixotrophic conditions to evaluate the organism's photosynthetic efficiency, oxygen production, and biomass growth over 2, 5, and 12 days. Photosynthetic performance was analyzed through chlorophyll a fluorescence induction (JIP-test), metabolic activity via gas chromatography, and biomass accumulation measurements.
View Article and Find Full Text PDFCells
January 2025
Department of Biology, Georgia State University, Atlanta, GA 30303, USA.
Lipophagy is a selective degradation of lipid droplets in lysosomes or vacuoles. Apart from its role in generating energy and free fatty acids for membrane repair, growth, and the formation of new membranes, lipophagy emerges as a key player in other cellular processes and disease pathogenesis. While fungal, plant, and algal cells use microlipophagy, the most prominent form of lipophagy in animal cells is macrolipophagy.
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