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Related Concept Videos

Sanger Sequencing01:57

Sanger Sequencing

DNA sequencing is a fundamental technique that is routinely used in the biological sciences. This method can be applied to a range of questions at different scales - from the sequencing of a cloned DNA fragment or the study of a mutation in a gene up to whole-genome sequencing. However, despite the widespread use of sequencing today, it was not until 1977 that Fredrick Sanger and his collaborators developed the chain-termination method to decode DNA sequences. It relies on the separation of a...

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Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing
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Evaluating sequence-derived mtDNA length heteroplasmy by amplicon size analysis.

C Berger1, P Hatzer-Grubwieser, C Hohoff

  • 1Institute of Legal Medicine, Innsbruck Medical University, Müllerstrasse 44, 6020 Innsbruck, Austria.

Forensic Science International. Genetics
|November 12, 2010
PubMed
Summary

Length heteroplasmy in mitochondrial DNA (mtDNA) can be challenging to analyze. New amplicon sizing assays provide clear, unambiguous results for difficult length heteroplasmy cases, improving analysis accuracy.

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Area of Science:

  • Mitochondrial genetics
  • Molecular biology
  • Forensic genetics

Background:

  • Length heteroplasmy (LH) in mitochondrial DNA (mtDNA) involves mixtures of variants within homopolymeric tracts.
  • Standard sequencing methods and difference-coded annotation struggle to quantify LH variation and identify dominant variants accurately.
  • Difficulty arises when multiple equally abundant LH variants are present or sequencing primers yield conflicting results.

Purpose of the Study:

  • To develop and validate fluorescence-based amplicon sizing assays for analyzing LH in key mtDNA control region hotspots.
  • To provide a more accurate method for quantifying LH variants compared to traditional sequencing.
  • To resolve ambiguous LH profiles encountered in Sanger sequencing.

Main Methods:

  • Design and implementation of amplicon sizing assays targeting five critical LH regions in the mtDNA control region (nt 16,189, 310, 460, 573, and AC-repeat 514-524).
  • Utilizing fluorescence-based detection for precise measurement of amplicon lengths.
  • Comparison of results with Sanger sequencing data, particularly for challenging LH samples.

Main Results:

  • The developed amplicon sizing assays yielded clear and unambiguous results for complex LH constellations.
  • High agreement was observed between the amplicon sizing assay results and traditional sequencing methods in most cases.
  • The assays effectively determined the ratios of LH variants, offering quantitative insights.

Conclusions:

  • Amplicon sizing assays offer a robust alternative for analyzing length heteroplasmy in mitochondrial DNA, especially in difficult cases.
  • This method enhances the accuracy and clarity of LH variant analysis, aiding in mtDNA haplotype determination.
  • The proposed method improves upon existing techniques for resolving complex mitochondrial DNA length heteroplasmy patterns.