HETEROPLASMY-ASSOCIATED MITOCHONDRIAL DNA VARIANTS IN HUMAN BLOOD AND SKELETAL MUSCLE SAMPLES
Objective: Mitochondrial heteroplasmy, a recognized trait in eukaryotic cells, plays a pivotal role in complex disorders like mitochondrial diseases. High-throughput sequencing has improved precision in detecting low-level heteroplasmy and can identify ultra-low-level variants (<1%) associate...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Istanbul University Press
2024-01-01
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| Series: | İstanbul Tıp Fakültesi Dergisi |
| Subjects: | |
| Online Access: | https://cdn.istanbul.edu.tr/file/JTA6CLJ8T5/9A952BCBF95F4BBBBBBD040629755A01 |
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| Summary: | Objective: Mitochondrial heteroplasmy, a recognized trait in eukaryotic cells, plays a pivotal role in complex disorders like mitochondrial diseases. High-throughput sequencing has improved precision in detecting low-level heteroplasmy and can identify ultra-low-level variants (<1%) associated with heteroplasmy attributes. We aimed to investigate potential genetic and demographic factors associated with heteroplasmy levels in mitochondrial variants by analyzing both blood and muscle tissues in individuals, regardless of their phenotypes.Material and Methods: High-throughput sequencing was conducted on the mitochondrial genomes of 10 individuals, with an equal gender distribution. Variants with heteroplasmy ratios both ranging from 5% to 95% and out of this range were used for statistical analysis.Result: A total of 194 heteroplasmic variants were identified, of which 13 displayed lower heteroplasmy ratios in both blood and skeletal muscle samples from females, while the mitochondrial control region (D-Loop) exhibited higher ratios.Conclusion: The study findings confirm the correlation between the m.10398A>G variant and mitochondrial heteroplasmy levels, consistent with prior research. Additionally, we identified the m.1811A>G variant in MT-RNR2 and the m.12308A>G variant in MT-TL2, both associated with higher heteroplasmy. Conversely, the m.582T>C variant in MT-TF, m.3260A>G in MT-TL1, m.3302A>G in MT-TL1, m.4409T>C in MT-TM, and m.4267A>G in MT-TI were linked to lower heteroplasmy, all involving transition-type alterations. Furthermore, our study hinted at a potential age-related threshold for variant accumulation in the control region. Future studies, involving larger cohorts and advanced expression analysis methods, will further contribute to the validation and enhancement of these findings. |
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| ISSN: | 1305-6441 |