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Related Concept Videos

Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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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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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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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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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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De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Mitochondria: A "pacemaker" for species-specific development.

Yasmine J Liu1, Johan Auwerx1

  • 1Laboratory of Integrative Systems Physiology, École polytechnique fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

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This summary is machine-generated.

Mitochondrial metabolism influences developmental speed by regulating cellular energy and redox balance. This is crucial for development in both mice and humans.

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Area of Science:

  • Developmental Biology
  • Mitochondrial Biology
  • Cellular Metabolism

Background:

  • Mitochondrial metabolism is essential for cellular function.
  • Developmental pace is a critical aspect of organismal growth.

Purpose of the Study:

  • To highlight research on mitochondrial metabolism's role in developmental timing.
  • To explain how cellular bioenergetics and redox homeostasis are involved.

Main Methods:

  • Review of studies by Diaz-Cuadros et al. and Iwata et al.
  • Analysis of mitochondrial function in developmental contexts.

Main Results:

  • Mitochondrial metabolism significantly impacts developmental rate.
  • Control over cellular bioenergetics is a key mechanism.
  • Redox homeostasis is intrinsically linked to developmental timing.

Conclusions:

  • Mitochondrial metabolic pathways are critical regulators of developmental pace.
  • These findings apply to both mouse and human development.
  • Understanding these processes offers insights into developmental biology.