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Overview of Transposition and Recombination02:13

Overview of Transposition and Recombination

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Transposons

Transposons, or "jumping genes," are small mobile genetic elements (MGEs) that range from 700 to 40,000 base pairs in length. They are found in all organisms and can move within the same chromosome or transfer to different chromosomes. In some cases, transposons can also jump between different host DNA molecules, such as plasmids or viruses, contributing to genetic variability.Barbara McClintock first discovered these mobile genetic elements in the 1940s while studying maize genetics, and she...
LTR Retrotransposons03:08

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LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
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Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

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.
The recognition sites for Cre recombinase called LoxP...
DNA-only Transposons02:57

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Sorting by reversals, generalized transpositions, and translocations using permutation groups.

Yen-Lin Huang1, Chin Lung Lu

  • 1Department of Computer Science, National Tsing Hua University, Hsinchu, Taiwan.

Journal of Computational Biology : a Journal of Computational Molecular Cell Biology
|May 27, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a new algorithm for genome sorting using reversals, block-interchanges, and translocations. It efficiently finds the minimum weight sequence of operations by leveraging permutation group theory.

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Area of Science:

  • Computational Biology
  • Genomics
  • Bioinformatics

Background:

  • Genome rearrangement sorting is crucial for comparative genomics.
  • Previous methods using breakpoint graphs are efficient but can be complex.
  • Handling weighted operations (reversals, block-interchanges, translocations) presents challenges.

Purpose of the Study:

  • To develop a novel and easily implemented algorithm for weighted genome sorting.
  • To address the problem of sorting linear/circular, multi-chromosomal genomes.
  • To find a minimum weight sequence of operations.

Main Methods:

  • Utilizing permutation group theory from algebra.
  • Developing a new algorithm for genome sorting.
  • Applying the algorithm to weighted reversals, block-interchanges, and translocations.

Main Results:

  • A novel and easily implemented algorithm for genome sorting was designed.
  • The algorithm addresses weighted operations in genome rearrangements.
  • It provides an efficient solution for sorting multi-chromosomal genomes.

Conclusions:

  • Permutation group theory offers a powerful framework for genome sorting algorithms.
  • The developed algorithm is efficient and practical for biological applications.
  • This work advances the field of computational genomics and genome rearrangement analysis.