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Updated: Mar 3, 2026

Analysis of Craniomaxillofacial Malformations in Mice Using Three-dimensional Microcomputed Tomography
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RUNX2 repeat variation does not drive craniofacial diversity in marsupials.

Axel H Newton1, Charles Y Feigin1, Andrew J Pask2

  • 1The School of BioSciences, The University of Melbourne, Victoria, 3010, Australia.

BMC Evolutionary Biology
|May 6, 2017
PubMed
Summary

Runt-related transcription factor 2 (RUNX2) QA repeat variation does not drive craniofacial diversity in marsupials. This RUNX2 repeat is highly conserved, suggesting alternative evolutionary pathways for marsupial craniofacial development.

Keywords:
CBFA1CraniofacialEvolutionMarsupialRUNX2Repeat purityRepeat variation

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Genetics

Background:

  • Runt-related transcription factor 2 (RUNX2) is crucial for skeletal development.
  • RUNX2 polyglutamine/polyalanine (QA) repeat variation correlates with facial length in placental mammals, driving craniofacial diversity.
  • The role of RUNX2 QA repeat variation in non-placental mammals remains unexplored.

Purpose of the Study:

  • To investigate the correlation between RUNX2 QA repeat ratio and facial length in marsupials, the sister group to placental mammals.
  • To understand the evolutionary constraints on the RUNX2 QA repeat in marsupials.

Main Methods:

  • Analysis of RUNX2 QA repeat variation across diverse marsupial species.
  • Comparison of RUNX2 QA repeat length and facial morphology.

Main Results:

  • Marsupials exhibit a wide range of facial lengths but show minimal variation in the RUNX2 QA repeat.
  • The marsupial RUNX2 QA repeat is under strong purifying selection, indicating extreme conservation.
  • High repeat purity was observed despite the conserved nature of the RUNX2 QA repeat.

Conclusions:

  • RUNX2 repeat variation does not contribute to craniofacial diversity in marsupials, unlike in placental mammals.
  • Conservation of the marsupial RUNX2 QA repeat is likely driven by the need for accelerated anterior skeleton ossification for pouch life.
  • Marsupials employ alternative mechanisms for craniofacial evolution compared to placental mammals.