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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

Mitochondrial Membranes

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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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Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
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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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ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

14.9K
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Non-nuclear Inheritance01:29

Non-nuclear Inheritance

21.6K
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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Related Experiment Video

Updated: Aug 9, 2025

An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model
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An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model

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Reproductive options in mitochondrial disease.

Hubert J M Smeets1, Suzanne C E H Sallevelt2, Mary Herbert3

  • 1Department of Tocicogenomics, Research School MHeNS and GROW, Maastricht University Medical Centre, Maastricht, The Netherlands.

Handbook of Clinical Neurology
|February 22, 2023
PubMed
Summary

Mitochondrial diseases necessitate tailored reproductive strategies. Options like prenatal diagnosis, genetic testing, and mitochondrial replacement therapy help prevent transmission of these genetic conditions.

Keywords:
Mitochondrial bottleneckMitochondrial diseaseMitochondrial replacement therapyPreimplantation genetic diagnosisPrenatal diagnosisReproductive optionsmtDNA disease

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Area of Science:

  • Genetics
  • Reproductive Medicine
  • Mitochondrial Biology

Background:

  • Mitochondrial diseases present unique reproductive challenges due to varied inheritance patterns.
  • Most are caused by nuclear gene mutations (Mendelian inheritance), while 15-25% stem from mitochondrial DNA (mtDNA) mutations.
  • Recurrence risks differ significantly based on the genetic origin (nuclear vs. mtDNA) and inheritance pattern (de novo vs. maternal).

Conclusions:

  • Reproductive counseling for mitochondrial diseases must be individualized based on genetic origin and inheritance.
  • Mitochondrial replacement therapy offers a novel and safe alternative for preventing transmission of both heteroplasmic and homoplasmic mtDNA mutations.
  • Technological advancements provide couples with diverse options to prevent the inheritance of mitochondrial disorders.