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Related Concept Videos

Exon Recombination02:32

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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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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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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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The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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De Novo Genes: Current Status and Future Goals.

Claudio Casola1,2,3, Victor Luria4,5,6, Nikolaos Vakirlis7

  • 1Department of Ecology and Conservation Biology, Texas A&M University, College Station, TX 77845, USA.

Genome Biology and Evolution
|November 28, 2025
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Summary

Scientists convened to discuss de novo gene birth, exploring gene identification, function, and evolution. Key findings cover microproteins and the role of new genes in human disease.

Keywords:
comparative genomicsgene evolutiongenome evolutionmicroproteinsrandom peptidesribosome profiling

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Molecular Biology

Background:

  • The Society for Molecular Biology and Evolution (SMBE) hosted a satellite meeting focused on de novo gene birth.
  • This meeting was the first dedicated gathering for scientists in this emerging field.
  • De novo genes are newly evolved genes that arise from previously non-coding sequences.

Purpose of the Study:

  • To summarize recent advances and open questions in de novo gene emergence and evolution.
  • To highlight key findings presented at the SMBE satellite meeting.
  • To discuss the biological significance and implications of de novo genes.

Main Methods:

  • Review of recent scientific literature on de novo gene evolution.
  • Synthesis of discussions and findings from the SMBE satellite meeting.
  • Analysis of experimental studies on random peptides and microproteins.

Main Results:

  • De novo gene identification, function, and evolutionary trajectories were discussed.
  • Experimental analyses of random peptides provide insights into de novo gene birth.
  • The role of de novo genes and associated microproteins in human disease is an active area of research.

Conclusions:

  • De novo gene birth is a significant source of evolutionary novelty.
  • Further research is needed to fully understand the mechanisms and functional impact of de novo genes.
  • De novo genes may play crucial roles in adaptation and disease pathogenesis.