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Related Concept Videos

Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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Single Nucleotide Polymorphisms-SNPs01:05

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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Sanger Sequencing

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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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Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Point and Frameshift Mutations01:30

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Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...
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Fixing Double-strand Breaks02:04

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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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GRIDSS2: comprehensive characterisation of somatic structural variation using single breakend variants and structural

Daniel L Cameron1,2,3, Jonathan Baber4,5, Charles Shale4,5

  • 1Bioinformatics Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Australia. cameron.d@wehi.edu.au.

Genome Biology
|July 13, 2021
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Summary
This summary is machine-generated.

GRIDSS2 advances structural variant detection by uniquely identifying single breakends, significantly improving the analysis of complex genomic rearrangements in metastatic cancers. This method achieves high accuracy, reducing false negatives and discoveries while revealing novel duplication signatures.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Cancer Research

Background:

  • Structural variants (SVs) are crucial in cancer genomics.
  • Accurate detection of SVs, especially complex ones, remains challenging.
  • Existing callers often struggle with single breakends and centromeric rearrangements.

Purpose of the Study:

  • Introduce GRIDSS2, a novel structural variant caller.
  • Enhance the detection and interpretation of genomic rearrangements.
  • Improve accuracy in analyzing somatic SVs in metastatic cancers.

Main Methods:

  • GRIDSS2 explicitly reports single breakends alongside breakpoints.
  • Treats single breakends as a primary signal for genomic rearrangements.
  • Applied to a cohort of 3782 deeply sequenced metastatic cancer samples.

Main Results:

  • GRIDSS2 explains 47% of somatic centromere copy number changes using single breakends.
  • Achieved a low false negative rate (3.1%) and false discovery rate (3.3%) in metastatic cancers.
  • Identified a novel 32-100 bp duplication signature and phased 16% of somatic calls.

Conclusions:

  • GRIDSS2 offers a significant advancement in structural variant detection accuracy.
  • The explicit reporting of single breakends improves the understanding of complex genomic alterations.
  • GRIDSS2 enhances the interpretation of cancer genomic data, aiding in discovery.