HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Dental Medicine / Faculty of Dental Medicine >
Peer-reviewed Journal Articles, etc >

Metameric variation of upper molars in hominoids and its implications for the diversification of molar morphogenesis

This item is licensed under:Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

Files in This Item:
HominoidMM_body_R3_1.pdf101.41 MBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/80118

Title: Metameric variation of upper molars in hominoids and its implications for the diversification of molar morphogenesis
Authors: Morita, Wataru Browse this author
Morimoto, Naoki Browse this author
Kono, Reiko T. Browse this author
Suwa, Gen Browse this author
Keywords: Metameric variation
Morphometric mapping
Hominoid evolution
Enamel-dentine junction
Molar morphology
Issue Date: Jan-2020
Publisher: Elsevier
Journal Title: Journal of human evolution
Volume: 138
Start Page: 102706
Publisher DOI: 10.1016/j.jhevol.2019.102706
Abstract: Metameric variation of molar size is in part associated with the dietary adaptations of mammals and results from slight alterations of developmental processes. Humans and great apes exhibit conspicuous variation in tooth morphology both between taxa and across tooth types. However, the manner in which metameric variation in molars emerged among apes and humans via evolutionary alterations in developmental processes remains largely unknown. In this study, we compare the enamel-dentine junction of the upper molars of humans-which closely correlates with morphology of the outer enamel surface and is less affected by wear-with that of the other extant hominoids: chimpanzees, bonobos, gorillas, orangutans, and gibbons. We used the morphometric mapping method to quantify and visualize three-dimensional morphological variation, and applied multivariate statistical analyses. Results revealed the following: 1) extant hominoids other than humans share a common pattern of metameric variation characterized by a largely linear change in morphospace; this indicates a relatively simple graded change in metameric molar shape; 2) intertaxon morphological differences become less distinct from the mesial to distal molars; and 3) humans diverge from the extant ape pattern in exhibiting a distinct metameric shape change trajectory in the morphospace. The graded shape change and lower intertaxon resolution from the mesial to distal molars are consistent with the concept of a 'key' tooth. The common metameric pattern observed among the extant nonhuman hominoids indicates that developmental patterns underlying metameric variation were largely conserved during ape evolution. Furthermore, the human-specific metameric pattern suggests considerable developmental modifications in the human lineage. (C) 2019 Elsevier Ltd. All rights reserved.
Rights: © <2020>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
https://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/80118
Appears in Collections:歯学院・歯学研究院 (Graduate School of Dental Medicine / Faculty of Dental Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 森田 航

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 

 - Hokkaido University