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Ontogenetic and functional modularity in the rodent mandible.

Rachel A Menegaz1, Matthew J Ravosa2

  • 1Center for Anatomical Sciences, 3500 Camp Bowie Boulevard, University of North Texas Health Science Center, Fort Worth, TX, 76107, USA.

Zoology (Jena, Germany)
|August 5, 2017
PubMed
Summary

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Dietary changes during development significantly impact jawbone (mandible) shape in adult rats. Early diet affects specific jaw parts, while later diet influences others, highlighting the need for naturalistic feeding models.

Area of Science:

  • Developmental biology
  • Comparative anatomy
  • Functional morphology

Background:

  • Dietary material properties influence adult morphology.
  • Previous studies used non-variable diets, limiting understanding of dietary variation effects.
  • Mandibular subunits may have differing plasticity, unaddressed by adult-only studies.

Purpose of the Study:

  • Investigate how intra-individual diet variation affects adult mandibular morphology.
  • Examine the plasticity windows of different mandibular modules.
  • Understand the impact of diet timing during ontogeny.

Main Methods:

  • Raised 42 Sprague Dawley rats from weaning to maturity in four dietary cohorts.
  • Two cohorts received stable diets (solid or powdered).
Keywords:
Dietary variabilityFallback foodsMammalsPhenotypic plasticity

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  • Two cohorts received variable diets (switched from solid to powdered or vice versa).

    • Main Results:

    • Mandibular corpus variation was higher in immature stages.
    • Adult morphology reflected both diet type and timing of consumption.
    • Coronoid process morphology distinguished early diet groups, suggesting an early plasticity window.
    • Angular process morphology reflected diet resistance, with a recency effect, indicating a prolonged plasticity window.

    Conclusions:

    • Ontogenetic timing of diet influences adult mandibular morphology.
    • Different mandibular modules (coronoid vs. angular process) exhibit distinct plasticity windows.
    • Naturalistic feeding models are crucial for understanding mammalian development and maturation.