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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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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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3D Multicolor DNA FISH Tool to Study Nuclear Architecture in Human Primary Cells
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Repression and 3D-restructuring resolves regulatory conflicts in evolutionarily rearranged genomes.

Alessa R Ringel1, Quentin Szabo2, Andrea M Chiariello3

  • 1Max Planck Institute for Molecular Genetics, Berlin, Germany; Institute for Medical and Human Genetics, Charité Universitätsmedizin Berlin, Berlin, Germany; Institute of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany.

Cell
|September 30, 2022
PubMed
Summary
This summary is machine-generated.

Novel genes integrate into existing regulatory regions without disrupting them. DNA methylation in specific contexts prevents interference, allowing independent gene expression and evolutionary flexibility.

Keywords:
3D genome organizationCTCFDNA methylationcohesindevelopmental gene regulationenhancer-promoter specificityevolutionlamina-associated domainloop extrusiontopologically associating domains

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Area of Science:

  • Genomics
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Regulatory landscapes are crucial for gene expression during development.
  • Maintaining regulatory integrity during the incorporation of new genes is poorly understood.
  • Topologically Associated Domains (TADs) organize the genome and influence gene regulation.

Purpose of the Study:

  • To investigate how a mammal-specific gene (Zfp42) integrated into an ancient TAD without affecting the expression of an existing gene (Fat1).
  • To elucidate the mechanisms maintaining independent gene regulation within a shared TAD during evolution.
  • To determine if regulatory complexity within TADs is a common evolutionary phenomenon.

Main Methods:

  • Investigated gene expression and regulatory mechanisms of Zfp42 and Fat1 in embryonic stem cells (ESCs) and embryonic limbs.
  • Analyzed chromatin activity, CTCF/cohesin binding, enhancer activity, and DNA methylation patterns.
  • Examined TAD partitioning and nuclear envelope attachment.
  • Performed a genome-wide analysis of gene distribution within TADs.

Main Results:

  • Zfp42 and Fat1 are physically separated by TAD partitioning in ESCs, with distinct enhancers driving independent expression.
  • Chromatin activity, not CTCF/cohesin, drives this separation in ESCs.
  • In embryonic limbs, Zfp42 is inactive within Fat1's TAD and unresponsive to Fat1 enhancers.
  • Context-dependent DNA methylation, not enhancer incompatibility or nuclear attachment, explains Zfp42's unresponsiveness.
  • Most TADs genome-wide contain multiple independently expressed genes.

Conclusions:

  • Diverse mechanisms, including chromatin activity and context-dependent DNA methylation, facilitate the integration of independently regulated genes within existing loci.
  • Regulatory complexity within TADs is a common feature in vertebrate evolution.
  • This study provides insights into how genomes accommodate novel genes while maintaining regulatory integrity.