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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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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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Non-nuclear Inheritance01:29

Non-nuclear Inheritance

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Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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Evolutionary Relationships through Genome Comparisons02:54

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes02:16

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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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Gene Evolution - Fast or Slow?02:05

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Related Experiment Video

Updated: Jun 25, 2025

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing
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Mitochondrial DNA: Inherent Complexities Relevant to Genetic Analyses.

Tomas Ferreira1,2, Santiago Rodriguez1,3

  • 1Bristol Medical School, University of Bristol, Bristol BS8 1UD, UK.

Genes
|May 25, 2024
PubMed
Summary

Mitochondrial DNA (mtDNA) has unique features requiring specialized genetic analysis. Understanding its complexities is crucial for interpreting human traits and diseases in genetic studies.

Keywords:
copy number variationsepigenetic modificationsgenetic analysesgenome-wide association studiesheteroplasmymitochondrial DNAphenome-wide association studiespopulation genetics

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Area of Science:

  • Genetics
  • Mitochondrial Biology
  • Human Health

Background:

  • Mitochondrial DNA (mtDNA) differs significantly from nuclear DNA, necessitating distinct analytical approaches.
  • mtDNA plays a critical role in cellular energy production and is implicated in various human traits and diseases.
  • Existing genetic study methodologies often do not fully account for mtDNA's unique characteristics.

Purpose of the Study:

  • To provide a comprehensive review of mitochondrial DNA's role in genetic studies.
  • To explore the implications of mtDNA structure, function, and variability in human traits and diseases.
  • To highlight challenges and recent advances in analyzing mtDNA.

Main Methods:

  • Literature review of genetic studies involving mitochondrial DNA.
  • Analysis of mtDNA structure, gene-encoding properties, and variability factors.
  • Discussion of methodological challenges and advancements in mtDNA research.

Main Results:

  • Mitochondrial DNA exhibits unique properties like high mutation rates, heteroplasmy, and copy number variations.
  • These properties significantly impact disease susceptibility and population genetic analyses.
  • Environmental factors and epigenetic modifications influence mtDNA function and variability.

Conclusions:

  • An integrated approach considering mtDNA's unique properties is essential for genetic studies.
  • Refined genetic research techniques are needed to accommodate mtDNA's complexities.
  • Further research and innovative methodologies are required to fully interpret mtDNA's implications in human health and disease.