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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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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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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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Parallel Genomic Remodelling Associated With Independent Terrestrialization Events in Arthropods.

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Arthropods independently evolved to live on land through parallel genomic changes. Key genes involved in stress response, transport, and development show similar evolutionary patterns across different land-colonizing groups.

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Comparative phylogenomics

Background:

  • Repeated transitions from aquatic to terrestrial environments (terrestrialization) are key evolutionary events.
  • The genomic underpinnings of terrestrialization are not fully understood.
  • Arthropods offer a model system with multiple independent terrestrialization events.

Purpose of the Study:

  • Investigate parallel genomic changes driving arthropod adaptation to land.
  • Identify shared genomic strategies across independent terrestrialization events.
  • Uncover the molecular basis of adaptation to terrestrial environments.

Main Methods:

  • Phylum-wide comparative phylogenomic analysis of 309 arthropod species.
  • Analysis of gene family evolutionary dynamics (expansions/contractions).
  • Directional selection analyses and functional enrichment of orthogroups.

Main Results:

  • Thousands of orthogroups showed parallel evolutionary dynamics across major terrestrial arthropod lineages (Arachnida, Myriapoda, Hexapoda).
  • Functional convergence observed in stress response, transport, metabolism, exoskeleton, and moulting.
  • Parallel evolution identified in key genes like aquaporins, solute carriers, and heat shock proteins.

Conclusions:

  • A conserved 'terrestrialization toolkit' of genes underlies independent colonization of land by arthropods.
  • Parallel genomic remodeling of developmental and immune pathways facilitated adaptation to terrestrial challenges.
  • Comparative genomics reveals shared molecular solutions for ecological transitions across evolutionary timescales.