Related Experiment Video
Updated: Feb 14, 2026
11:21
Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions
Published on: August 30, 2024
1.3K
Short telomeres in mitochondrial DNA depletion disorders
Yumi Dille1, Emmanouil Rampakakis2, Geraldine Aubert3
1Division of Neurology, Department of Pediatrics, Montreal Children's Hospital, McGill University Health Centre, 1001 Décarie Boulevard, Montreal, Quebec, Canada.
Mitochondrion
|February 12, 2026
Summary
Mitochondrial DNA (mtDNA) depletion disorders (MDDs) are linked to shorter telomeres, particularly in granulocytes. This finding may offer insights into MDD pathophysiology and telomere length as a potential biomarker.
Area of Science:
- Genetics
- Cell Biology
- Biochemistry
Background:
- Mitochondrial DNA (mtDNA) depletion disorders (MDDs) are rare genetic conditions causing significant mtDNA reduction.
- MDDs impact high-energy tissues like muscle, liver, and brain, potentially leading to multisystem failure.
Purpose of the Study:
- To investigate the relationship between telomere length and MDDs.
- To explore telomere length as a potential biomarker for mitochondrial diseases.
Main Methods:
- Telomere length was measured in lymphocytes, granulocytes, T cells, and B cells from MDD patients and healthy controls.
Main Results:
- Patients with MDDs exhibited shorter overall telomere length compared to healthy controls.
- The most pronounced telomere shortening was observed in granulocytes of MDD patients.
Conclusions:
- mtDNA depletion is associated with reduced telomere length, suggesting a connection in MDD pathophysiology.
- Telomere length warrants further investigation as a potential biomarker for mitochondrial disease.
Related Concept Videos
02:41Telomeres and Telomerase
27.4K
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
27.4K
02:41Telomeres and Telomerase
7.4K
7.4K
02:59Animal Mitochondrial Genetics
9.3K
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...
9.3K
02:16Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes
17.1K
The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
17.1K
02:19Export of Mitochondrial and Chloroplast Genes
4.2K
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...
4.2K
01:20MOSFET: Depletion Mode
873
Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
873