Related Experiment Video
Updated: Feb 22, 2026
07:24
Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing
Published on: February 10, 2023
2.0K
Genetics of Mitochondrial Disease
1Seattle Children's Hospital/University of Washington, Seattle, WA, United States.
Advances in Genetics
|September 26, 2017
Summary
Mitochondrial diseases stem from genetic changes in either mitochondrial DNA (mtDNA) or nuclear DNA (nDNA). Understanding their complex physiology aids gene discovery for better diagnosis of these diverse energy production disorders.
Area of Science:
- Cellular Biology
- Genetics
- Biochemistry
Background:
- Mitochondria generate adenosine triphosphate (ATP) for cellular energy, requiring precise regulation.
- Mitochondrial function is controlled by both mitochondrial DNA (mtDNA) and nuclear DNA (nDNA).
- Mitochondrial dysfunction, arising from genetic defects in mtDNA or nDNA, leads to a wide spectrum of diseases.
Purpose of the Study:
- To explore the interplay between mitochondrial physiology and gene discovery in genetically derived mitochondrial diseases.
- To highlight the challenges and advancements in diagnosing complex mitochondrial disorders.
Main Methods:
- Review of current knowledge on mitochondrial genetics and disease mechanisms.
- Analysis of gene sequencing strategies and phenotypic correlation for diagnosis.
Main Results:
- Mitochondrial diseases exhibit diverse clinical presentations, with varied onset and multisystem involvement.
- Approximately 275 genes are currently linked to mitochondrial disease, with a complex mitoproteome of ~1500 proteins.
- Gene discovery for mitochondrial disorders is challenging due to complex disease expression.
Conclusions:
- The unique physiology of mitochondria contributes to the heterogeneity of genetic diseases.
- Advancements in gene sequencing and phenotypic analysis are crucial for improving the diagnosis of mitochondrial disorders.
- Further research into mitochondrial genetics and physiology is essential for understanding and treating these diseases.
Related Concept Videos
02:59Animal Mitochondrial Genetics
9.4K
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...
9.4K
01:48ATP Synthase: Mechanism
17.5K
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...
17.5K
01:45Mitochondrial Membranes
17.4K
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,...
17.4K
01:37Mitochondria
20.9K
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,...
20.9K
01:19Translocation of Proteins into the Mitochondria
13.5K
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,...
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,...
13.5K
01:43Incomplete Dominance
30.5K
Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
30.5K