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A non-invasive method for screening mitochondrial diabetes.
Hangyu Fang1,2, Xiaoe Li3, Shuping Wang4
1Key Laboratory of Endocrine Glucose & Lipids Metabolism and Brain Aging, Ministry of Education, Jinan, Shandong, China.
Frontiers in Genetics
|June 16, 2025
Summary
Mitochondrial diabetes mellitus (MDM) screening is improved by detecting the m.3243A>G mutation in oral cells. This non-invasive PCR method offers high accuracy for early MDM diagnosis.
Area of Science:
- Genetics and Genomics
- Endocrinology and Metabolism
- Mitochondrial Biology
Background:
- Mitochondrial diabetes mellitus (MDM) arises from mitochondrial dysfunction and is often misdiagnosed due to its low incidence and clinical overlap with type 1 and type 2 diabetes.
- High rates of missed diagnoses for MDM stem from limited clinical experience, underscoring the need for effective screening and early detection methods.
- Developing rapid and accurate detection techniques is crucial for improving the diagnostic rate of MDM.
Purpose of the Study:
- To evaluate the utility of detecting the m.3243A>G mutation in oral exfoliated cells as a screening method for Mitochondrial diabetes mellitus (MDM).
- To determine the positivity rate of the m.3243A>G mutation in a patient cohort and assess the clinical phenotypes associated with MDM.
- To provide a diagnostic foundation for clinicians by comparing clinical manifestations between MDM and non-MDM patients.
Main Methods:
- A multicenter observational study involving the collection of oral exfoliated cells from 478 patients.
- Detection of the m.3243A>G mutation using Polymerase Chain Reaction (PCR) on collected cell samples.
- Clinical evaluation of the detection method's sensitivity and specificity, alongside statistical comparison of clinical phenotypes between MDM and non-MDM groups.
Main Results:
- The m.3243A>G mutation was identified in 16 patients (3.35% positivity rate), with an asymptomatic carrier rate of 0.84%.
- The PCR-based detection of the m.3243A>G mutation demonstrated high clinical sensitivity (87.2%) and specificity (96.9%), with high patient satisfaction.
- MDM patients exhibited a higher likelihood of neurological hearing loss and multiple systemic manifestations, consistent with maternal inheritance patterns.
Conclusions:
- Detection of the m.3243A>G mutation via oral exfoliated cells is a simple, non-invasive, and highly accurate method for MDM screening.
- This method, despite its advantages, remains underutilized, highlighting a gap in current diagnostic practices for MDM.
- Further research and validation are essential to optimize this approach for improved MDM screening and diagnosis rates.
