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Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing

Published on: February 10, 2023

Twin Mitochondrial Sequence Analysis.

Yosr Bouhlal¹, Selena Martinez, Henry Gong

¹Division of Medical Genetics, Department of Pediatrics, University of California San Francisco, San Francisco, CA, USA.

Molecular Genetics & Genomic Medicine

|September 17, 2013

Summary

This summary is machine-generated.

Identical twins share highly similar mitochondrial DNA (mtDNA) sequences, confirming genetic identity extends to this crucial cellular component. Differentiating mtDNA from nuclear mitochondrial sequences (numts) is vital for accurate genome sequencing.

Keywords:

genome heteroplasmy mitochondrial primer extension sequencing twins

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Simultaneous Mapping and Quantitation of Ribonucleotides in Human Mitochondrial DNA

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Published on: November 14, 2017

Area of Science:

Genomics
Molecular Biology
Human Genetics

Background:

Genome-wide sequencing requires accurate variant resolution, especially in homologous genomic regions.
The human mitochondrial genome (mtDNA) presents interpretation challenges due to heteroplasmy, somatic variation, and nuclear mitochondrial sequences (numts).
The long-term sequence similarity of mtDNA in identical twins remains largely uncharacterized.

Purpose of the Study:

To compare the mitochondrial DNA sequences of an adult monozygotic twin pair.
To evaluate the potential for sequence variation within the mitochondrial genome of identical twins.
To investigate the distinction between mitochondrial DNA (mtDNA) and nuclear mitochondrial sequences (numts) in sequencing data.

Main Methods:

High-throughput sequencing was employed to analyze the mitochondrial genomes of adult monozygotic twins.
Variant calls were evaluated using primer extension and mitochondrial DNA pre-enrichment techniques.
Low-level variant calls with high homology to mtDNA were further assessed to differentiate between mtDNA and numts.

Main Results:

Thirty-seven shared variants were identified between the monozygotic twins and verified on their genomic DNA.
The study supports a high degree of genetic sequence identity in the mitochondrial DNA of the twin pair.
Analysis of pre-enriched mitochondrial DNA templates indicated that some low-level variants likely represent numts, distinguishable from true mtDNA variations.

Conclusions:

Genetic identity in monozygotic twins extends to their mitochondrial DNA.
Accurate differentiation between mtDNA and numts is critical for reliable genome sequencing and interpretation.
Further research into mtDNA and numts variation is essential for understanding its occurrence and persistence.