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Related Concept Videos

Exon Recombination02:32

Exon Recombination

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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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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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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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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Retroelement expansions underlie genome evolution in stingless bees.

Natalia de Souza Araujo1, Patricia Azevedo2, Rafael Rodrigues Ferrari3

  • 1Evolutionary Biology and Ecology, Université Libre de Bruxelles, Avenue F.D. Roosevelt 50, Brussels, B-1050, Belgium. natalia.de.souza.araujo@ulb.be.

BMC Genomics
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PubMed
Summary

Transposable elements (TEs) drive significant genome evolution in stingless bees. Differences in TE content explain major heterochromatin variations between Melipona species, impacting chromosomal and epigenetic innovation.

Keywords:
Comparative genomicsGypsy retroelementsHeterochromatinLTR retrotransposonsMeliponaPollinatorTransposable elements

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Area of Science:

  • Insect genomics
  • Evolutionary biology
  • Eusocial insect genetics

Background:

  • Stingless bees (Melipona) exhibit distinct heterochromatin organization, correlating with genome size and transposable element (TE) content.
  • Understanding these differences is key to exploring genome evolution in insects.

Purpose of the Study:

  • To provide high-resolution genome assemblies for two Melipona species with contrasting heterochromatin content.
  • To investigate the role of TEs in shaping genome structure and heterochromatin distribution.

Main Methods:

  • Long-read sequencing and 3D chromosome conformation scaffolding for genome assembly.
  • Comparative genomic analyses of M. quadrifasciata and M. scutellaris.
  • Analysis of transposable element content, distribution, and association with structural variants.

Main Results:

  • Genome assemblies reveal conserved synteny but significant divergence in structural variants and TE types between the two species.
  • M. scutellaris shows an expansion of retrotransposons (Gypsy/DIRS1) in TE hotspots linked to rearrangements.
  • Distinct methylation patterns and expanded histone deacetylase orthologs observed in M. scutellaris.
  • TE dynamics, with retrotransposon expansion in M. scutellaris and DNA transposon expansion in M. quadrifasciata, explain heterochromatin differences despite similar genome sizes.

Conclusions:

  • Transposable element dynamics are a major driver of heterochromatin variation and chromosomal evolution in Melipona.
  • TEs significantly influence epigenetic innovation and genome structural diversity in eusocial insects.
  • High-resolution genomic resources for these species advance understanding of genome evolution in stingless bees.