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Related Concept Videos

Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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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An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model
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Published on: March 9, 2022

Current molecular diagnostic algorithm for mitochondrial disorders.

Lee-Jun C Wong1, Fernando Scaglia, Brett H Graham

  • 1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA. ljwong@bcm.edu

Molecular Genetics and Metabolism
|April 3, 2010
PubMed
Summary
This summary is machine-generated.

Diagnosing mitochondrial respiratory chain disorders (RCD) is complex due to genetic heterogeneity and dual genome involvement. Advanced molecular testing, considering clinical and biochemical data, is crucial for accurate diagnosis and genetic counseling.

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Published on: September 18, 2014

Area of Science:

  • Biochemistry
  • Genetics
  • Molecular Biology

Background:

  • Mitochondrial respiratory chain disorders (RCD) are a complex group of diseases stemming from genetic and biochemical factors.
  • The involvement of both mitochondrial and nuclear genomes in encoding respiratory chain components adds to their heterogeneity.
  • Heterogeneity in RCDs necessitates a multi-faceted diagnostic approach.

Purpose of the Study:

  • To highlight the diagnostic challenges in mitochondrial respiratory chain disorders.
  • To emphasize the importance of integrating various diagnostic criteria for RCDs.
  • To discuss the role of molecular diagnostics in confirming RCD diagnoses.

Main Methods:

  • Classification incorporates clinical, biochemical, histological, and DNA-based molecular diagnostic testing.
  • Molecular testing faces challenges due to the large number of genes, dual genome complexity, and heteroplasmy.
  • Gene selection depends on patient history, clinical findings, and tissue availability.

Main Results:

  • Screening for common mitochondrial DNA (mtDNA) mutations and deletions is a primary step.
  • Direct sequencing of nuclear genes is performed when specific syndromes or deficiencies are identified.
  • Measurement of mtDNA content aids in diagnosing mtDNA depletion syndromes.

Conclusions:

  • Accurate diagnosis of RCDs requires a comprehensive strategy combining clinical, biochemical, and molecular data.
  • Advances in molecular diagnostics, including an expanding gene list, are improving diagnostic accuracy.
  • Improved diagnostic capabilities will enhance genetic counseling for patients and families affected by RCDs.