A dysmorphic mouse model reveals developmental interactions of chondrocranium and dermatocranium

  1. Susan M Motch Perrine  Is a corresponding author
  2. M Kathleen Pitirri
  3. Emily L Durham
  4. Mizuho Kawasaki
  5. Hao Zheng
  6. Danny Z Chen
  7. Kazuhiko Kawasaki
  8. Joan T Richtsmeier  Is a corresponding author
  1. The Pennsylvania State University, United States
  2. University of Notre Dame, United States
  3. Pennsylvania State University, United States

Abstract

The cranial endo- and dermal skeletons, which comprise the vertebrate skull, evolved independently over 470 million years ago and form separately during embryogenesis. In mammals, much of the cartilaginous chondrocranium is transient, undergoing endochondral ossification or disappearing, so its role in skull morphogenesis is not well studied and it remains an enigmatic structure. We provide complete three-dimensional (3D) reconstructions of the laboratory mouse chondrocranium from embryonic day 13.5 through 17.5 using a novel methodology of uncertainty-guided segmentation of phosphotungstic enhanced 3D microcomputed tomography images with sparse annotation. We evaluate the embryonic mouse chondrocranium and dermatocranium in 3D and delineate the effects of a Fgfr2 variant on embryonic chondrocranial cartilages and on their association with forming dermal bones using the Fgfr2cC342Y/+ Crouzon syndrome mouse. We show that the dermatocranium develops outside of and in shapes that conform to the chondrocranium. Results reveal direct effects of the Fgfr2 variant on embryonic cartilage, on chondrocranium morphology, and on the association between chondrocranium and dermatocranium development. Histologically we observe a trend of relatively more chondrocytes, larger chondrocytes, and/or more matrix in the Fgfr2cC342Y/+ embryos at all timepoints before the chondrocranium begins to disintegrate at E16.5. The chondrocrania and forming dermatocrania of Fgfr2cC342Y/+ embryos are relatively large, but a contrasting trend begins at E16.5 and continues into early postnatal (P0 and P2) timepoints, with the skulls of older Fgfr2cC342Y/+ mice reduced in most dimensions compared to Fgfr2c+/+ littermates. Our findings have implications for the study and treatment of human craniofacial disease, for understanding the impact of chondrocranial morphology on skull growth, and potentially on the evolution of skull morphology.

Data availability

Due to the large size of the majority of these data, data have been made available through Penn State University Libraries ScholarSphere repository at DOI 10.26207/qgke-r185 and include: bone micro-CT images, PTA-e micro-CT images, 3D reconstruction examples of the chondrocrania of one unaffected (Fgfr2c+/+) and one affected (Fgfr2cC342Y/+) at E13.5, E14.5, E15.5, E16.5, and E17.5, bone volumes, histological images, histomorphometric data, 3D landmark coordinate data, correlation matrices estimated by MIBoot used in MI analyses, PCA output, and suture scores. Information on how to download the WinEDMA programs can be found at https://getahead.la.psu.edu/resources/edma and the EDMAinR programs are available on github (https://github.com/psolymos/EDMAinR). Code for automatic chondrocranium segmentation with very sparse annotation via uncertainty-guided self-training is available through https://github.com/ndcse-medical/CartSeg_UGST. PTA-e staining protocols for various embryonic ages of mice are available: https://doi.org/10.1002/dvdy.136

The following data sets were generated

Article and author information

Author details

  1. Susan M Motch Perrine

    Department of Anthropology, The Pennsylvania State University, University Park, United States
    For correspondence
    qzk2@psu.edu
    Competing interests
    The authors declare that no competing interests exist.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0003-3412-221X
  2. M Kathleen Pitirri

    Department of Anthropology, The Pennsylvania State University, University Park, United States
    Competing interests
    The authors declare that no competing interests exist.
  3. Emily L Durham

    Department of Anthropology, The Pennsylvania State University, University Park, United States
    Competing interests
    The authors declare that no competing interests exist.
  4. Mizuho Kawasaki

    Department of Anthropology, The Pennsylvania State University, University Park, United States
    Competing interests
    The authors declare that no competing interests exist.
  5. Hao Zheng

    Department of Computer Science and Engineering, University of Notre Dame, Notre Dame, United States
    Competing interests
    The authors declare that no competing interests exist.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-9790-7607
  6. Danny Z Chen

    Department of Computer Science and Engineering, University of Notre Dame, Notre Dame, United States
    Competing interests
    The authors declare that no competing interests exist.
  7. Kazuhiko Kawasaki

    Department of Anthropology, Pennsylvania State University, University Park, United States
    Competing interests
    The authors declare that no competing interests exist.
  8. Joan T Richtsmeier

    Department of Anthropology, Pennsylvania State University, University Park, United States
    For correspondence
    jta10@psu.edu
    Competing interests
    The authors declare that no competing interests exist.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-0239-5822

Funding

National Institute of Dental and Craniofacial Research (R01DE027677)

  • Joan T Richtsmeier

Eunice Kennedy Shriver National Institute of Child Health and Human Development (P01HD078233)

  • Joan T Richtsmeier

National Institute of Dental and Craniofacial Research (R01 DE031439)

  • Joan T Richtsmeier

National Science Foundation (CCF-1617735)

  • Danny Z Chen

The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.

Ethics

Animal experimentation: This study was performed in strict accordance with the recommendations in the Guide for the Care and Use of Laboratory Animals of the National Institutes of Health. All of the animals were handled according to approved institutional animal care and use committee (IACUC) protocols (#446558) of the Pennsylvania State University.

Copyright

© 2022, Motch Perrine et al.

This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.

Metrics

  • 1,619
    views
  • 292
    downloads
  • 8
    citations

Views, downloads and citations are aggregated across all versions of this paper published by eLife.

Download links

A two-part list of links to download the article, or parts of the article, in various formats.

Downloads (link to download the article as PDF)

Open citations (links to open the citations from this article in various online reference manager services)

Cite this article (links to download the citations from this article in formats compatible with various reference manager tools)

  1. Susan M Motch Perrine
  2. M Kathleen Pitirri
  3. Emily L Durham
  4. Mizuho Kawasaki
  5. Hao Zheng
  6. Danny Z Chen
  7. Kazuhiko Kawasaki
  8. Joan T Richtsmeier
(2022)
A dysmorphic mouse model reveals developmental interactions of chondrocranium and dermatocranium
eLife 11:e76653.
https://doi.org/10.7554/eLife.76653

Share this article

https://doi.org/10.7554/eLife.76653

Further reading

    1. Developmental Biology
    Bin Zhu, Rui Wei ... Pei Liang
    Research Article

    Wing dimorphism is a common phenomenon that plays key roles in the environmental adaptation of aphid; however, the signal transduction in response to environmental cues and the regulation mechanism related to this event remain unknown. Adenosine (A) to inosine (I) RNA editing is a post-transcriptional modification that extends transcriptome variety without altering the genome, playing essential roles in numerous biological and physiological processes. Here, we present a chromosome-level genome assembly of the rose-grain aphid Metopolophium dirhodum by using PacBio long HiFi reads and Hi-C technology. The final genome assembly for M. dirhodum is 447.8 Mb, with 98.50% of the assembled sequences anchored to nine chromosomes. The contig and scaffold N50 values are 7.82 and 37.54 Mb, respectively. A total of 18,003 protein-coding genes were predicted, of which 92.05% were functionally annotated. In addition, 11,678 A-to-I RNA-editing sites were systematically identified based on this assembled M. dirhodum genome, and two synonymous A-to-I RNA-editing sites on CYP18A1 were closely associated with transgenerational wing dimorphism induced by crowding. One of these A-to-I RNA-editing sites may prevent the binding of miR-3036-5p to CYP18A1, thus elevating CYP18A1 expression, decreasing 20E titer, and finally regulating the wing dimorphism of offspring. Meanwhile, crowding can also inhibit miR-3036-5p expression and further increase CYP18A1 abundance, resulting in winged offspring. These findings support that A-to-I RNA editing is a dynamic mechanism in the regulation of transgenerational wing dimorphism in aphids and would advance our understanding of the roles of RNA editing in environmental adaptability and phenotypic plasticity.

    1. Developmental Biology
    Hanee Lee, Junsu Kang ... Junho Lee
    Research Article

    The evolutionarily conserved Hippo (Hpo) pathway has been shown to impact early development and tumorigenesis by governing cell proliferation and apoptosis. However, its post-developmental roles are relatively unexplored. Here, we demonstrate its roles in post-mitotic cells by showing that defective Hpo signaling accelerates age-associated structural and functional decline of neurons in Caenorhabditis elegans. Loss of wts-1/LATS, the core kinase of the Hpo pathway, resulted in premature deformation of touch neurons and impaired touch responses in a yap-1/YAP-dependent manner, the downstream transcriptional co-activator of LATS. Decreased movement as well as microtubule destabilization by treatment with colchicine or disruption of microtubule-stabilizing genes alleviated the neuronal deformation of wts-1 mutants. Colchicine exerted neuroprotective effects even during normal aging. In addition, the deficiency of a microtubule-severing enzyme spas-1 also led to precocious structural deformation. These results consistently suggest that hyper-stabilized microtubules in both wts-1-deficient neurons and normally aged neurons are detrimental to the maintenance of neuronal structural integrity. In summary, Hpo pathway governs the structural and functional maintenance of differentiated neurons by modulating microtubule stability, raising the possibility that the microtubule stability of fully developed neurons could be a promising target to delay neuronal aging. Our study provides potential therapeutic approaches to combat age- or disease-related neurodegeneration.