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Animal Mitochondrial Genetics02:59

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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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QUANTIFICATION OF MITOCHONDRIAL MORPHOLOGY IN SITU.

V A Popkov, E Yu Plotnikov, L D Zorova

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    Assessing mitochondrial structure via confocal imaging reveals cell health. Three-dimensional reconstruction offers the most detail, but simpler 2D methods can also evaluate mitochondrial fragmentation and organization.

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    Area of Science:

    • Cell Biology
    • Mitochondrial Dynamics
    • Bioimaging

    Background:

    • Mitochondrial structural organization is a key indicator of cellular function and viability.
    • Mitochondrial fragmentation, a ratio of branched to rounded structures, serves as an indirect measure of mitochondrial and cellular health.
    • Accurate assessment of mitochondrial architecture requires advanced imaging and analysis techniques.

    Purpose of the Study:

    • To develop and evaluate methods for analyzing mitochondrial structural organization using confocal microscopy.
    • To compare the effectiveness of different image analysis approaches for quantifying mitochondrial morphology.
    • To provide insights into mitochondrial architecture under normal conditions and during oxidative stress-induced fission.

    Main Methods:

    • Confocal microscopy was used to acquire images of mitochondria stained with a fluorescent probe.
    • Three distinct image analysis approaches were tested: three-dimensional reconstruction from Z-series confocal images, and two-dimensional analyses including single-image methods.
    • Mitochondrial structural architecture was analyzed under norm conditions and following induced fission via oxidative stress.

    Main Results:

    • Three-dimensional reconstruction based on Z-dimension confocal image series provides the most comprehensive analysis of mitochondrial organization.
    • Simpler 2D analysis algorithms, including those using single images, are also plausible for evaluating mitochondrial fragmentation, albeit with limitations.
    • The study identified key parameters for quantifying mitochondrial morpho-functional status, such as absolute and relative volumes.

    Conclusions:

    • Advanced image analysis techniques, particularly 3D reconstruction, are crucial for a thorough understanding of mitochondrial architecture.
    • Accessible 2D methods offer a viable alternative for assessing mitochondrial fragmentation and organization in various cellular states.
    • Further refinement of these image analysis methods will enhance the comprehensive study of mitochondrial dynamics in health and disease, offering deeper insights into the mitochondriome.