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Animal Mitochondrial Genetics

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...

Mutations

Mutations

Mutations

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

Mutations

Mutations

Spontaneous and Induced Mutations

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

Mitochondria

Mitochondria

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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Transmitochondrial Cybrid Generation Using Cancer Cell Lines

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Mitochondrial DNA mutations and human disease.

Helen A L Tuppen¹, Emma L Blakely, Douglass M Turnbull

¹Mitochondrial Research Group, Institute for Ageing and Health, The Medical School, Newcastle University, Newcastle upon Tyne NE24HH, UK.

Biochimica Et Biophysica Acta

|September 19, 2009

Summary

Mitochondrial disorders stem from oxidative phosphorylation defects. This review details genetic causes, focusing on mitochondrial DNA mutations, and discusses diagnostic and therapeutic advancements for these complex energy-deficiency diseases.

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

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

Published on: March 9, 2022

Area of Science:

Genetics
Molecular Biology
Biochemistry

Background:

Mitochondrial disorders are a diverse group of diseases caused by impaired cellular energy production due to oxidative phosphorylation (OXPHOS) defects.
Over 250 pathogenic mitochondrial DNA (mtDNA) mutations have been identified since 1988, with an increasing number of nuclear DNA mutations also reported.

Purpose of the Study:

To review the genetic causes of mitochondrial disorders, with a specific focus on primary mtDNA genetic defects.
To discuss the functional consequences of identified mtDNA mutations.
To explore current and potential future diagnostic and therapeutic strategies.

Main Methods:

Literature review of genetic defects in mitochondrial disorders.
Analysis of functional consequences of mtDNA mutations.
Discussion of diagnostic and therapeutic advances.

Main Results:

Cataloguing of over 250 pathogenic mtDNA mutations.
Identification of increasing numbers of nuclear DNA mutations contributing to mitochondrial disorders.
Characterization of functional consequences of various mtDNA mutations.

Conclusions:

Understanding mitochondrial genetics is crucial for deciphering disease mechanisms.
Diagnostic and therapeutic approaches for mitochondrial disorders are evolving.
Further research into mitochondrial genetics and disease models is needed.