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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...

Ribosome Profiling

Ribosome Profiling

Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique helps...

Translocation of Proteins into the Mitochondria

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...

Mitochondrial Precursor Proteins

Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70 chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial precursors...

Export of Mitochondrial and Chloroplast Genes

Export of Mitochondrial and Chloroplast Genes

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 irrespective...

Mitochondrial Protein Sorting

Mitochondrial Protein Sorting

Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...

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Related Experiment Video

Updated: Jun 19, 2026

Labelling and Visualization of Mitochondrial Genome Expression Products in Baker's Yeast Saccharomyces cerevisiae

Labelling and Visualization of Mitochondrial Genome Expression Products in Baker's Yeast Saccharomyces cerevisiae

Published on: April 11, 2021

Mitochondrial gene profiling: translational perspectives.

Daniel S Johnston¹, Yan A Su, Salvatore Alesci

¹Discovery Translational Medicine, Wyeth Research, 500 Arcola Rd, S2323, Collegeville, PA 19426, USA.

Pharmacogenomics

|October 22, 2009

Summary

This summary is machine-generated.

Microarray platforms now comprehensively analyze mitochondrial and nuclear genes. This technology promises to identify biomarkers for diseases and drug safety, aiding early diagnosis and patient stratification.

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Area of Science:

Genomics
Molecular Biology
Biotechnology

Background:

Mitochondrial dysfunction is linked to severe diseases like cancer, metabolic disorders, and neurodegenerative conditions.
Mitochondria play a crucial role in cellular energy production and are implicated in drug toxicity.
Comprehensive genetic and genomic analysis of mitochondria is essential for understanding disease mechanisms.

Purpose of the Study:

To highlight the advancements in microarray platforms for studying mitochondrial and nuclear genes.
To underscore the potential of focused microarrays in identifying biomarkers for disease diagnosis and prognosis.
To explore the application of microarrays in predicting drug safety and stratifying patients for clinical trials.

Main Methods:

Development of comprehensive microarray platforms for gene expression and sequence analysis.
Utilizing focused microarrays for targeted profiling of mitochondrial and nuclear genes.
Applying genomic analysis to identify genetic and sequence variations in mitochondria.

Main Results:

Microarray platforms enable simultaneous study of mitochondrial and nuclear gene expression and sequence.
Mitochondrial genetic profiling can reveal biomarkers for early disease detection.
This approach aids in predicting drug responses and patient outcomes.

Conclusions:

Focused microarrays offer a powerful tool for comprehensive mitochondrial genetic and genomic profiling.
This technology facilitates the discovery of novel biomarkers for various diseases.
Microarray-based analysis is crucial for advancing personalized medicine and drug development.