[A non-invasive method for detecting mitochondrial tRNA^Thr15927G>A mutation].

Area of Science:

• Genetics
• Mitochondrial Diseases
• Molecular Diagnostics

Background:

• Maternal hereditary mitochondrial diseases are often caused by mutations in mitochondrial DNA.
• The tRNA^Thr15927G>A (m.15927G>A) mutation is one such pathogenic variant.
• Accurate and accessible diagnostic methods are crucial for timely intervention.

Purpose of the Study:

• To evaluate the feasibility of using buccal swabs for detecting the m.15927G>A mutation.
• To compare DNA quality from buccal swabs versus blood samples.
• To assess the diagnostic accuracy of buccal swab analysis for this specific mitochondrial mutation.

Main Methods:

• Sequence analysis of mitochondrial DNA was performed on 2070 patients.
• Identified 3 patients with the m.15927G>A mutation for further study.
• Extracted DNA from buccal swabs and blood samples of patients and controls.
• Utilized dot blot, Southern blot hybridization, and DNA sequencing for mutation detection.

Main Results:

• No significant difference in DNA concentration between buccal swabs and blood.
• Lower purity of manually extracted buccal DNA compared to blood or kit-extracted DNA.
• DNA sequencing successfully identified the m.15927G>A mutation in all mutation group samples.
• Hybridization methods showed positive results in controls and negative in the mutation group, indicating specificity.

Conclusions:

• Buccal swab collection is a feasible, accurate, and sensitive method for detecting the m.15927G>A mutation.
• This method holds promise for non-invasive diagnosis of maternal hereditary mitochondrial diseases.
• Further validation with larger cohorts is warranted.