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Related Concept Videos

Mitochondria01:37

Mitochondria

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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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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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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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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The Inner Mitochondrial Membrane01:28

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
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Linking mitochondria metabolism, developmental timing, and human brain evolution.

Pierre Casimir1, Ryohei Iwata2, Pierre Vanderhaeghen2

  • 1VIB Center for Brain & Disease Research, 3000 Leuven, Belgium; Department of Neurosciences, Leuven Brain Institute, KU Leuven, 3000 Leuven, Belgium; Université Libre de Bruxelles (ULB), Institut de Recherches en Biologie Humaine et Moléculaire (IRIBHM), and ULB Neuroscience Institute (UNI), 1070 Brussels, Belgium; Department of Neurology, Centre Hospitalier Universitaire Brugmann, ULB, 1020 Brussels, Belgium.

Current Opinion in Genetics & Development
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Summary
This summary is machine-generated.

Mitochondria and metabolism influence the tempo of brain development, impacting species-specific brain evolution. Manipulating mitochondrial activity alters neuron maturation rates, highlighting their role in developmental timing.

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Area of Science:

  • Evolutionary biology
  • Neuroscience
  • Cellular metabolism

Background:

  • Developmental timing is crucial for organ evolution, notably in the prolonged cerebral cortex development of humans (neoteny).
  • Species-specific differences in brain development tempo are observed across mammals.
  • The role of mitochondria and metabolism in regulating neuronal development speed is an emerging area of research.

Purpose of the Study:

  • To review recent findings on the contribution of mitochondria and metabolism to species differences in cortical neuron development.
  • To explore how mitochondrial activity influences the tempo of neuronal maturation.
  • To understand the implications of mitochondria as a 'cellular hourglass' in human brain evolution.

Main Methods:

  • Review of current scientific literature on mitochondrial function and neuronal development.
  • Analysis of species-specific patterns in mitochondrial activity and developmental timelines.
  • Examination of experimental data manipulating mitochondrial activity in human and mouse neurons.

Main Results:

  • Mitochondria exhibit species-specific developmental timelines and metabolic patterns correlated with neuron maturation speed.
  • Increased mitochondrial activity accelerates human cortical neuron maturation.
  • Decreased mitochondrial activity slows down mouse neuron maturation.

Conclusions:

  • Mitochondria and their metabolic activity act as a cellular regulator of neuronal developmental tempo.
  • These mitochondrial mechanisms contribute to species-specific features of human brain ontogeny and evolution.
  • Mitochondria are key players in the evolutionary divergence of brain development across species.