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Related Concept Videos

Next-generation Sequencing03:00

Next-generation Sequencing

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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....
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Sanger Sequencing01:57

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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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RNA-seq03:21

RNA-seq

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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. 
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Applications of Molecular Taxonomy01:20

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Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...
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Maxam-Gilbert Sequencing01:05

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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
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Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

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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...
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Ultra-long Read Sequencing for Whole Genomic DNA Analysis
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Deep-Sequencing Technologies and Potential Applications in Forensic DNA Testing.

R R Zascavage1, S J Shewale1, J V Planz2

  • 1Department of Forensic and Investigative Genetics, University of North Texas Health Science Center, Fort Worth, TX, USA.

Forensic Science Review
|August 1, 2015
PubMed
Summary
This summary is machine-generated.

Second- and third-generation DNA sequencing technologies offer advanced applications in forensics and diagnostics. These deep-sequencing methods provide faster, cheaper, and more in-depth analysis for applications like STR analysis and body fluid identification.

Keywords:
DNADNA sequencingRNA body fluid identificationSTRmtDNAnext-generation sequencingsingle nucleotide polymorphisms

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Area of Science:

  • Molecular Biology
  • Genomics
  • Forensic Science

Background:

  • Second- and third-generation DNA sequencing technologies have expanded applications in molecular diagnostics, gene therapy, biosecurity, and forensics.
  • These advanced technologies offer advantages such as increased depth of coverage, reduced labor, cost, and time through parallel analysis of multiple DNA fragments.

Purpose of the Study:

  • To review the principles and applications of second- and third-generation DNA sequencing technologies.
  • To highlight the impact of deep-sequencing on forensic DNA analysis, including STR analysis, mtDNA sequencing, and SNP analysis.
  • To discuss the expanding capabilities and potential of these technologies in various scientific fields.

Main Methods:

  • Overview of diverse biochemical principles underlying next-generation sequencing (NGS) platforms.
  • Discussion of parallel processing of DNA fragments for enhanced sequencing depth.
  • Review of forensic applications, including mitochondrial DNA (mtDNA) sequencing and Short Tandem Repeat (STR) analysis.

Main Results:

  • Deep-sequencing technologies have revolutionized forensic DNA analysis, enabling detailed studies of STRs, mtDNA, and Single Nucleotide Polymorphisms (SNPs).
  • These methods improve mixture resolution and body fluid identification, overcoming limitations of first-generation sequencing.
  • The capabilities of DNA sequencing are continuously being expanded through ongoing research and development.

Conclusions:

  • Next-generation sequencing technologies provide powerful tools for forensic investigations and molecular diagnostics.
  • Deep sequencing offers significant advantages over traditional methods for complex DNA analysis.
  • Continued advancements in DNA sequencing promise further innovation across scientific disciplines.