Increase in Mitochondrial D-Loop Region Methylation Levels in Mild Cognitive Impairment Individuals
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Updated: Sep 21, 2025
Methodology for Accurate Detection of Mitochondrial DNA Methylation
Published on: May 20, 2018
Andrea Stoccoro1, Filippo Baldacci2, Roberto Ceravolo2
1Department of Translational Research and of New Surgical and Medical Technologies, University of Pisa, Via Roma 55, 56126 Pisa, Italy.
Abstract:
Methylation levels of the mitochondrial displacement loop (D-loop) region have been reported to be altered in the brain and blood of Alzheimer's disease (AD) patients. Moreover, a dynamic D-loop methylation pattern was observed in the brain of transgenic AD mice along with disease progression. However, investigations on the blood cells of AD patients in the prodromal phases of the disease have not been performed so far. The aim of this study was to analyze D-loop methylation levels by means of the MS-HRM technique in the peripheral blood cells of 14 mild cognitive impairment (MCI) patients, 18 early stage AD patients, 70 advanced stage AD patients, and 105 healthy control subjects. We found higher D-loop methylation levels in MCI patients than in control subjects and AD patients. Moreover, higher D-loop methylation levels were observed in control subjects than in AD patients in advanced stages of the disease, but not in those at early stages. The present pilot study shows that peripheral D-loop methylation levels differ in patients at different stages of AD pathology, suggesting that further studies deserve to be performed in order to validate the usefulness of D-loop methylation analysis as a peripheral biomarker for the early detection of AD.
Insights
Methylation in the mitochondrial D-loop region differs across Alzheimer's disease (AD) stages. Peripheral D-loop methylation may serve as a biomarker for early AD detection, showing distinct patterns in mild cognitive impairment.
Area of Science:
- Neuroscience
- Genetics
- Biochemistry
Background:
- Mitochondrial DNA (mtDNA) D-loop methylation alterations are observed in Alzheimer's disease (AD) brain and blood.
- Dynamic D-loop methylation patterns correlate with disease progression in transgenic AD mouse models.
- Limited research exists on D-loop methylation in blood during prodromal AD stages.
Purpose of the Study:
- To investigate D-loop methylation levels in peripheral blood cells across different stages of AD.
- To assess the potential of D-loop methylation as an early diagnostic biomarker for AD.
Main Methods:
- Methylation-Sensitive High-Resolution Melting (MS-HRM) technique was employed.
- Analysis included peripheral blood cells from mild cognitive impairment (MCI) patients, early and advanced AD patients, and healthy controls.
Main Results:
- Higher D-loop methylation levels were found in MCI patients compared to controls and AD patients.
- Control subjects exhibited higher D-loop methylation than advanced AD patients, but not early AD patients.
- Peripheral D-loop methylation levels varied significantly across different AD disease stages.
Conclusions:
- Peripheral D-loop methylation patterns differ between various stages of AD pathology.
- Further validation studies are warranted to confirm D-loop methylation analysis as a peripheral biomarker for early AD detection.
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