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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.
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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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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.
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Nucleotide Excision Repair01:38

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DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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Overview of DNA Repair02:25

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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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Next-generation DNA damage sequencing.

Cécile Mingard1, Junzhou Wu, Maureen McKeague

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New sequencing methods map DNA damage and repair across the genome. This reveals how chromatin states and transcription factors influence damage distribution, identifying mutation-prone genomic regions.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Biochemistry

Background:

  • Cellular DNA undergoes constant chemical alteration from internal and external sources.
  • Genome integrity is crucial for life, and DNA damage is linked to cancer and aging.
  • Mapping DNA damage formation and repair is key to understanding genome-wide damage distribution.

Purpose of the Study:

  • To detail advancements in high-resolution mapping of DNA damage and repair.
  • To explore how chromatin states and transcription factors influence DNA damage distribution.
  • To identify genomic regions vulnerable to mutation.

Main Methods:

  • Development of DNA damage sequencing library construction strategies.
  • Application of new data analysis pipelines for damage mapping.
  • High-resolution and single nucleotide resolution mapping of damaged bases.

Main Results:

  • Novel approaches enable genome-wide mapping of specific DNA damage formation and repair.
  • DNA damage distribution is significantly influenced by chromatin states and transcription factor binding.
  • Identification of preferred sequences for damage formation and repair, highlighting genomic weak spots.

Conclusions:

  • Advanced sequencing techniques provide unprecedented insights into DNA damage and repair.
  • Understanding DNA damage patterns aids in elucidating disease mechanisms and predicting chemotherapeutic drug efficacy.
  • This technology is crucial for identifying mutation-vulnerable genomic sites.