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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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Mitochondrial Membranes01:45

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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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Export of Mitochondrial and Chloroplast Genes02:19

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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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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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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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Electron Transport Chain: Complex I and II01:46

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Conservation Mitonuclear Replacement: Facilitated mitochondrial adaptation for a changing world.

Erik N K Iverson1

  • 1Department of Integrative Biology The University of Texas at Austin Austin Texas USA.

Evolutionary Applications
|March 12, 2024
PubMed
Summary

Species struggle to adapt to climate change due to limited genetic variation and human impacts. Assisted evolution, like Conservation Mitonuclear Replacement (CmNR), can introduce beneficial mitochondrial and nuclear genes to aid species survival.

Keywords:
assisted evolutionclimate changeconservationfacilitated adaptationgenetic rescuemitochondriamitonuclear interactions

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Area of Science:

  • Evolutionary biology
  • Conservation genetics
  • Genomics

Background:

  • Species face significant challenges adapting to rapid climate change due to insufficient genetic variation and anthropogenic pressures like habitat fragmentation.
  • Mitochondrial genomes, encoding core metabolic genes, are crucial for environmental tolerance and interact with nuclear genes, forming coadapted mitonuclear complexes.
  • These mitonuclear interactions can act as reproductive barriers, but also offer avenues for adaptive introgression.

Purpose of the Study:

  • To address the limitations of natural adaptation in the face of climate change.
  • To propose a novel facilitated adaptation technique, Conservation Mitonuclear Replacement (CmNR), for enhancing species' adaptive potential.
  • To highlight the importance of mitonuclear genetic variability in conservation strategies.

Main Methods:

  • Reviewing the role of mitochondrial genomes and mitonuclear interactions in adaptation.
  • Proposing Conservation Mitonuclear Replacement (CmNR) as a method to introduce adaptive genetic variation.
  • Suggesting the combination of CRISPR-based nuclear gene editing, mitochondrial replacement, and assisted reproductive technologies for CmNR.

Main Results:

  • Most species lack the necessary genetic variation and evolutionary rate to cope with climate change.
  • Anthropogenic factors further reduce adaptive potential by limiting gene flow and genetic diversity.
  • Mitochondrial genomes can introgress adaptively, potentially bringing compatible nuclear genes.

Conclusions:

  • Facilitated adaptation, particularly through CmNR, offers a potential solution for species unable to adapt naturally to climate change.
  • Conservation Mitonuclear Replacement (CmNR) could preserve phenotypes while enhancing adaptive capacity by replacing mitochondrial genomes and key nuclear loci.
  • This technique holds promise for conserving threatened populations, especially in rapidly changing environments like mountaintops.