Related Experiment Video
Updated: May 5, 2026
09:15
Measuring Single-Cell Mitochondrial DNA Copy Number and Heteroplasmy Using Digital Droplet Polymerase Chain Reaction
Published on: July 12, 2022
4.8K
Association between blood mitochondrial DNA copy number and cognitive function: A cross-sectional study based on the
Atsushi Teshigawara1, Genki Mizuno2,3, Hiroya Yamada3
1Department of Preventive Medical Sciences, Fujita Health University, School of Medical Sciences, Toyoake, Aichi, Japan.
Fujita Medical Journal
|May 4, 2026
Summary
Lower mitochondrial DNA copy number (mtDNA-CN) is linked to poorer cognitive function in Japanese adults. This sex-specific association may help identify individuals at risk for cognitive decline.
Area of Science:
- Neuroscience
- Genetics
- Public Health
Background:
- Mitochondrial dysfunction is linked to neurodegenerative diseases.
- Evidence on mitochondrial DNA copy number (mtDNA-CN) and general population cognitive performance is limited.
Purpose of the Study:
- To investigate the association between peripheral blood mtDNA-CN and cognitive function in the Japanese population.
- To explore potential sex-specific differences in this association.
Main Methods:
- Cross-sectional analysis of 282 participants from the Yakumo Study.
- Measurement of peripheral blood mtDNA-CN using quantitative real-time PCR.
- Assessment of cognitive function via SMMSE, LMT, and D-CAT, with logistic regression analysis.
Main Results:
- Lower mtDNA-CN associated with poorer SMMSE scores in women.
- Lower mtDNA-CN associated with reduced D-CAT performance (attention, executive function) in men.
- No significant association found with LMT scores in either sex.
Conclusions:
- mtDNA-CN shows domain- and sex-specific associations with cognitive performance in the general Japanese population.
- mtDNA-CN may serve as a non-invasive biomarker for early identification of cognitive decline risk.
- Further longitudinal studies are needed to confirm predictive utility for dementia prevention.
Related Concept Videos
02:59Animal Mitochondrial Genetics
7.8K
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...
7.8K
01:37Mitochondria
13.4K
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,...
13.4K
01:45Mitochondrial Membranes
11.7K
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,...
11.7K