Sequence polymorphisms within the human mitochondrial genes MTATP6, MTATP8 and MTND4

Area of Science:

• Genetics
• Forensic Science
• Molecular Biology

Background:

• Mitochondrial DNA (mtDNA) control region sequencing differentiates most human samples.
• Extending analysis to mtDNA coding regions can further increase differentiation probability.
• Focusing on non-amino acid-altering positions ensures phenotypically irrelevant data.

Purpose of the Study:

• To identify variable positions within specific mitochondrial genes for enhanced human DNA identification.
• To analyze sequence data from MTATP6, MTATP8, and MTND4 genes for forensic applications.

Main Methods:

• Sequencing of the MTATP6, MTATP8, and MTND4 genes from 109 subjects.
• Analysis of sequence data to identify variable base positions.
• Evaluation of identified positions for forensic suitability, including SNP potential.

Main Results:

• 32 variable base positions were found in 850 bases of the MTATPase genes (MTATP6 and MTATP8).
• 28 variable positions were identified in 1,200 bases of the MTND4 gene.
• Specific "hot spots" for base exchanges were identified in both gene regions.
• Position 11,719 in the MTND4 gene was highlighted as potentially suitable for SNP investigation.

Conclusions:

• Sequencing coding regions of mitochondrial DNA, like MTATP6, MTATP8, and MTND4, significantly increases human DNA sample differentiation.
• Variable positions within these genes, particularly "hot spots," offer valuable markers for forensic identification.
• The identified SNP at position 11,719 in MTND4 shows promise for forensic investigations.