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Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Methodology for Accurate Detection of Mitochondrial DNA Methylation
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Mitochondrial DNA Analysis.

Ashley M Cooley1

  • 1Virginia Department of Forensic Science, Richmond, VA, USA. ashley.cooley@dfs.virginia.gov.

Methods in Molecular Biology (Clifton, N.J.)
|July 13, 2023
PubMed
Summary

Mitochondrial DNA (mtDNA) analysis is crucial for identifying unknown human remains and missing persons, even from degraded samples. This method offers reliable forensic identification using maternal lineage genetic information.

Keywords:
Bone analysisDNA sequencingDNA typingForensic DNA analysisForensic scienceHair analysisMitochondrial DNA

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Area of Science:

  • Forensic Science
  • Genetics
  • Molecular Biology

Background:

  • Mitochondrial DNA (mtDNA) is a maternally inherited, 16,569 base pair (bp) circular genome.
  • mtDNA analysis is frequently employed in forensic science for identifying unidentified human remains and missing persons.
  • Challenging sample types, including rootless hairs and degraded bone, often require advanced techniques like mtDNA analysis.

Purpose of the Study:

  • To detail the general methodology for forensic mtDNA analysis.
  • To highlight the utility of mtDNA in challenging forensic identification cases.
  • To provide a reliable method for extracting, amplifying, quantifying, and analyzing mtDNA sequences.

Main Methods:

  • Extraction of mitochondrial DNA from various biological samples.
  • Amplification of specific mtDNA regions using Polymerase Chain Reaction (PCR).
  • Quantification of mtDNA to assess sample quality and quantity.
  • Sequencing and analysis of the mtDNA profile for identification.

Main Results:

  • mtDNA can be successfully extracted even from highly degraded samples due to its cellular protection.
  • Forensic mtDNA analysis has a strong track record of peer-reviewed validation and court acceptance since the late 1990s.
  • The described methodology provides a consistent and reliable approach for casework.

Conclusions:

  • Mitochondrial DNA analysis is a valuable and reliable tool in forensic casework, particularly for challenging samples.
  • The established protocols ensure consistent and dependable results for identification purposes.
  • This chapter provides a comprehensive overview of the forensic mtDNA analysis workflow.