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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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Related Experiment Video

Updated: Aug 13, 2025

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The EXTENSIN enigma.

Steven Moussu1,2, Gwyneth Ingram3

  • 1Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, 31320 Auzeville Tolosane, France.

Cell Surface (Amsterdam, Netherlands)
|January 20, 2023
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Summary
This summary is machine-generated.

Extensins (EXTs) are vital plant cell wall proteins crucial for growth. Their complexity challenges functional studies, but research is advancing our understanding of their roles.

Keywords:
Cell wallEXTENSINGlycosylationHydroxyproline-rich glycoproteinPeroxidase

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Extensins (EXTs) are abundant, enigmatic cell wall proteins found in multicellular plants.
  • They are integrated into the cell wall matrix and proposed to regulate cell-wall properties dynamically.
  • EXTs are considered important for plant growth and development.

Purpose of the Study:

  • To provide an overview of current knowledge on extensin (EXT) biochemistry and properties.
  • To summarize the tools used for studying the biological functions of EXTs in plants.

Main Methods:

  • Biochemical analysis of extensin properties.
  • Review of genetic and molecular tools for studying extensin function.
  • Comparative analysis across plant lineages.

Main Results:

  • Extensins are biochemically complex and highly diverse.
  • Multiple genes encode extensins, complicating functional characterization.
  • Various tools have been developed to investigate extensin roles.

Conclusions:

  • Despite challenges, ongoing research is elucidating the critical functions of extensins in plant growth and development.
  • Understanding extensin biochemistry and function is key to advancing plant science.