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Related Concept Videos

Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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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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Non-LTR Retrotransposons

As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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Ectopic gene conversions in the human genome.

David Benovoy1, Guy Drouin

  • 1Département de biologie et Centre de recherche avancée en génomique environnementale, Université d'Ottawa, Ottawa, Ontario, Canada K1N 6N5.

Genomics
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Summary

Gene conversions occur frequently in human gene families, with their size and occurrence linked to sequence similarity and recombination rates. Nearby genes and intronic regions influence conversion patterns.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Human Genomics

Background:

  • Gene conversion is a mechanism of genetic recombination.
  • Understanding gene conversion is crucial for studying genome evolution and gene family dynamics.

Purpose of the Study:

  • To characterize gene conversions in human gene families using the GENCONV method.
  • To investigate the frequency, length, and influencing factors of gene conversions in humans.

Main Methods:

  • Utilized the GENCONV method for analysis.
  • Analyzed 1434 human protein-coding gene families with at least three genes.
  • Compared 55,050 gene pairs to identify conversion events.

Main Results:

  • Gene conversions occur at a frequency of 0.88%, with an average length of 371 bp.
  • Conversion frequency and size correlate positively with sequence similarity and local recombination rates.
  • Intrachromosomal conversions are more frequent than interchromosomal ones, increasing with gene proximity.
  • Intronic regions show shorter conversions due to lower sequence similarity.
  • A bias towards the 3'-end suggests involvement of incomplete cDNA molecules.

Conclusions:

  • Gene conversion is a significant evolutionary force in human gene families.
  • Sequence similarity, recombination rates, gene location, and intron/exon structure modulate gene conversion.
  • The findings shed light on the role of gene conversion in shaping gene families and potential involvement of non-allelic homologous recombination.