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Related Concept Videos

Next-generation Sequencing03:00

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.
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...
Maxam-Gilbert Sequencing01:05

Maxam-Gilbert Sequencing

In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
Challenges of the Maxam-Gilbert Method
The...
Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
RNA-seq03:21

RNA-seq

RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases. 
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...

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Related Experiment Video

Updated: Jun 2, 2026

Nanopore DNA Sequencing for Metagenomic Soil Analysis
07:33

Nanopore DNA Sequencing for Metagenomic Soil Analysis

Published on: December 14, 2017

Current next generation sequencing technology may not meet forensic standards.

Hans-Jürgen Bandelt1, Antonio Salas

  • 1Department of Mathematics, University of Hamburg, 20146 Hamburg, Germany. bandelt@yahoo.com

Forensic Science International. Genetics
|May 14, 2011
PubMed
Summary
This summary is machine-generated.

Mitochondrial DNA (mtDNA) variation is not as pronounced as previously thought, impacting forensic science. New analysis shows the technology used missed several mutations, requiring further calibration studies.

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Area of Science:

  • Forensic Science
  • Genetics
  • Mitochondrial DNA Analysis

Background:

  • A 2010 Nature paper suggested significant intra-individual mitochondrial DNA (mtDNA) variation, with common heteroplasmies varying by tissue.
  • This finding, if accurate, would have substantial implications for forensic casework and DNA profiling.

Purpose of the Study:

  • To reassess the accuracy of mtDNA variation detection methods used in a previous study.
  • To evaluate the reliability of claims regarding widespread intra-individual mtDNA heteroplasmy for forensic applications.

Main Methods:

  • In silico reassessment of existing mtDNA sequencing data from the 2010 Nature paper.
  • Comparative analysis of detected germ-line variations against a reference sequence.

Main Results:

  • The technology employed in the 2010 study incompletely detected germ-line variations.
  • On average, at least five mutations per sample were missed, indicating underestimation of variation detection capabilities.
  • The extent of intra-individual mtDNA variation may not be as pronounced as initially reported.

Conclusions:

  • The initial claims of widespread and significant intra-individual mtDNA variation for forensic use require re-evaluation.
  • Further calibration studies under strict forensic conditions are necessary before widespread adoption of comprehensive mtDNA genome data.
  • Advancements in technology and rigorous validation are crucial for reliable forensic mtDNA analysis.