Hair shafts are one of the most common types of evidence at crime scenes, and mitochondrial DNA (mtDNA) has been analyzed as a valuable genetic marker for hair shafts in forensic casework. However, the mtDNA analysis strategy may vary according to the quantity and quality of DNA extracted from a forensic sample and the available massively parallel sequencing (MPS) platform in laboratories. Forensic practitioners often have to interpret mtDNA sequences exhibiting point heteroplasmy (PHP) that are analyzed using different analytical methods. In the present study, the whole mitochondrial genome (mtGenome) variants of hair shaft samples obtained from 20 donors, which were sampled in duplicate and stored at room temperature for > 1 year, were analyzed using the Precision ID mtDNA Whole Genome Panel and Ion S5 system. The whole mtGenome variants of 20 blood and 20 buccal swab samples (reference samples) from the hair shaft donors were analyzed using the Nextera XT DNA Library Prep Kit and MiSeq System. A total of 20 unique mtGenome haplotypes were observed, and 56 PHP variants were identified across the 4 sets of tissue. When the major nucleotide of PHP was considered, 16 of 20 haplotypes of the hair shaft samples matched those of the corresponding blood and buccal swab samples. In four donors, the major nucleotide of PHP was inverted at one nucleotide position between the hair shaft and reference samples. However, the data obtained on MPS, showing high PHP resolution, provided substantial information to avoid false exclusion when comparing two haplotypes containing PHP with inverted major nucleotides. In conclusion, the present study demonstrates the utility of MPS in forensic casework in the comparative analysis of mtGenome variants containing PHP.
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The authors would like to thank P.H. Kim and C.H. Lee from Thermo Fisher Scientific Korea for their generous support for this research.
This study was supported by the Bio & Medical Technology Development Program of the National Research Foundation (NRF) funded by the Ministry of Science and ICT (NRF-2014M3A9E1069989).
Conflict of interest
The authors declare that they have no conflicts of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional Review Board of Severance Hospital, Yonsei University, Seoul, Korea (4-2015-1068) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all individual participants included in the study.
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Kim, B.M., Hong, S.R., Chun, H. et al. Comparison of whole mitochondrial genome variants between hair shafts and reference samples using massively parallel sequencing. Int J Legal Med 134, 853–861 (2020). https://doi.org/10.1007/s00414-019-02205-y
- Mitochondrial DNA
- Hair shaft
- Massively parallel sequencing
- Point heteroplasmy