Mitochondria

Who was among the first to notice mitochondria?

Albert von Kölliker in 1857.

What term was coined by Carl Benda in 1898?

The term mitochondrion.

What is the endosymbiosis theory related to?

The origin of mitochondria as progenitors for eukaryotic cells.

What is the primary function of mitochondria?

To perform the Krebs cycle and oxidative phosphorylation.

What did Philip Siekevitz introduce in 1957?

The term 'powerhouse of the cell' referring to mitochondria.

What are the two membranes of mitochondria called?

Inner membrane (IMM) and outer membrane (OMM).

What is contained within the mitochondrial matrix?

Mitochondrial DNA (mtDNA) and enzymes for metabolic processes.

What is the significance of cardiolipin (CL) in mitochondria?

It is important for membrane curvature and oxidative phosphorylation complex stability.

What historical event in 1963 demonstrated that mitochondria contained DNA?

Nass & Nass conducted morphological studies showing mtDNA.

What did Saccone et al. show in 1965 regarding mitochondria?

Isolated rat liver mitochondria were able to synthesize RNA.

What is the structure of most animal mitochondrial genomes?

Mostly single circular, but can also be multiple circular or linear with telomeres.

What is heteroplasmy in mitochondrial genetics?

A condition where there is a constant changing population of mtDNA mutations.

What does maternal inheritance of mtDNA ensure?

Paternal mitochondria are degraded soon after fertilization.

What is the significance of the year 1988 in mitochondrial research?

It was the first demonstration that mtDNA mutations are responsible for diseases.

How many pathogenic mutations are associated with mitochondrial diseases?

Over 700 pathogenic mutations linked to more than 50 types of mitochondrial diseases.

What is the estimated prevalence of mitochondrial diseases?

Affecting 1 in 4300 people.

What is the difference between homoplasmy and heteroplasmy?

Homoplasmy refers to uniform mtDNA, while heteroplasmy indicates a mixture of different mtDNA types.

What types of conditions have been linked to mtDNA mutations?

Cancer, diabetes, neurodegenerative disorders, and aging.

What is the size range of mitochondrial DNA (mtDNA) in animals?

13-42 kb.

What is the size range of mitochondrial DNA (mtDNA) in plants?

184 - 11,400 kb.

What is a unique feature of fungal mtDNA?

It can contain introns and has a variable amount of non-coding DNA.

What are the mechanisms that prevent paternal leakage of mtDNA?

Multiple mechanisms including degradation of paternal mitochondria after fertilization.

What is the role of mitochondria in cellular signaling?

Mitochondria act as cellular and organismal signaling hubs.

What is the importance of the cristae in mitochondria?

Cristae increase the surface area for ATP production during oxidative phosphorylation.

What is mitochondrial replacement therapy?

A technique involving three-parent babies to prevent mitochondrial diseases.

When was the first three-parent boy born?

In 2016 in Mexico.

What are mitochondria?

Dynamic organelles that play a crucial role in energy production and cellular metabolism.

What is mitophagy?

The process of degrading damaged mitochondria to maintain cellular health.

What are the key players in mitochondrial fusion and fission?

Proteins such as Drp1, MFN1, MFN2, and OPA1.

What is the significance of mitochondrial trafficking?

It involves the movement of mitochondria along microtubules for proper cellular function.

What is the role of kinesin and dynein in mitochondria?

They are motor proteins that facilitate mitochondrial trafficking.

What happens during mitochondrial fusion?

Mitochondria merge to form larger organelles, which can enhance their function.

What is the impact of mitochondrial fragmentation in diabetes?

Increased fragmentation is linked to impaired glucose metabolism and insulin resistance.

How does mitochondrial dynamics relate to heart failure?

Fragmentation leads to reduced energy supply and impaired contractile function.

What clinical syndromes are associated with mitochondrial dysfunction?

Diseases like Parkinson's, Alzheimer's, and various types of cancer.

What is the effect of excessive mitochondrial fission?

It can lead to cell death and various diseases, including ischemia-reperfusion injury.

How does mitochondrial morphology change in Alzheimer's Disease?

Increased fragmentation and dysfunctional dynamics are observed.

What is the role of mitochondrial-derived vesicles (MDVs)?

They facilitate communication and transport between mitochondria and other organelles.

What are mito-ER contact sites (MERCS)?

Regions where mitochondria and the endoplasmic reticulum interact, crucial for cellular signaling.

What is the relationship between mitochondrial dynamics and spermatogenesis?

Mitochondria undergo transformation and play a role in sperm cell development.

What are the consequences of disrupted mitochondrial fusion?

It can lead to conditions like dilated cardiomyopathy.

What is the impact of mitochondrial dynamics on cancer?

Altered dynamics can promote cell proliferation and tumor growth.

What are the basic properties of mitochondria?

They are involved in energy production, metabolic signaling, and cellular homeostasis.

What is the significance of mitochondrial DNA?

It is inherited maternally and linked to various mitochondrial diseases.

What is the role of actin in mitochondrial movement?

Actin-based mechanisms help anchor and move mitochondria within cells.

How does mitochondrial fragmentation affect cognitive function?

It can lead to decreased ATP production and impairments in motor and cognitive abilities.

What is the relationship between mitochondrial dynamics and oxidative stress?

Impaired dynamics can increase ROS generation, leading to cellular damage.

What is the effect of mitochondrial dysfunction in cardiomyopathy?

It results in abnormal cardiac structure and function, contributing to heart disease.

How does mitochondrial dynamics influence metabolic diseases?

Alterations in dynamics can lead to metabolic disorders such as non-alcoholic fatty liver disease.

What are the learning outcomes related to mitochondria?

Understanding their properties, dynamics, and interactions with other organelles.