The presence of accessory cusps in chimpanzee lower molars is consistent with a patterning cascade model of development.

Journal of Anatomy
Matthew M Skinner, Philipp Gunz

Abstract

Tooth crown morphology is of primary importance in fossil primate systematics and understanding the developmental basis of its variation facilitates phenotypic analyses of fossil teeth. Lower molars of species in the chimp/human clade (including fossil hominins) possess between four and seven cusps and this variability has been implicated in alpha taxonomy and phylogenetic systematics. What is known about the developmental basis of variation in cusp number - based primarily on experimental studies of rodent molars - suggests that cusps form under a morphodynamic, patterning cascade model involving the iterative formation of enamel knots. In this study we test whether variation in cusp 6 (C6) presence in common chimpanzee and bonobo lower molars (n = 55) is consistent with predictions derived from the patterning cascade model. Using microcomputed tomography we imaged the enamel-dentine junction of lower molars and used geometric morphometrics to examine shape variation in the molar crown correlated with variation in C6 presence (in particular the size and spacing of the dentine horns). Results indicate that C6 presence is consistent with predictions of a patterning cascade model, with larger molars exhibiting a higher frequency ...Continue Reading

References

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Jun 6, 2002·Proceedings of the National Academy of Sciences of the United States of America·Isaac Salazar-Ciudad, Jukka Jernvall
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Nov 14, 2006·Journal of Human Evolution·Philipp Gunz, Katerina Harvati
Aug 23, 2007·Novartis Foundation Symposium·Jukka Jernvall, Isaac Salazar-Ciudad
Dec 1, 2007·Journal of Human Evolution·Matthew M SkinnerJean-Jacques Hublin
Apr 22, 2009·American Journal of Physical Anthropology·Matthew M SkinnerJean-Jacques Hublin
Jun 2, 2009·Journal of Human Evolution·Philipp GunzFred L Bookstein
Mar 12, 2010·Nature·Isaac Salazar-Ciudad, Jukka Jernvall

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Citations

Sep 7, 2013·American Journal of Physical Anthropology·Georgios PolychronisDemetrios J Halazonetis
Jan 4, 2013·American Journal of Physical Anthropology·Stephanie MoormannJohn Hunter
Jun 8, 2011·Evolution; International Journal of Organic Evolution·Aida Gómez-RoblesJosé María Bermúdez de Castro
Oct 15, 2013·Source Code for Biology and Medicine·Gert WollnyThomas Hierl
Jan 15, 2014·Journal of Dental Research·W MoritaM Nakatsukasa
Apr 14, 2018·Science Advances·Alejandra OrtizMatthew M Skinner
Aug 26, 2020·Journal of Anatomy·José María Bermúdez de CastroMaría Martinón-Torres
Jul 16, 2017·Scientific Reports·Kornelius KupczikMartin S Fischer
Jul 19, 2017·Journal of Anatomy·Alejandra OrtizMatthew M Skinner
Nov 26, 2019·Journal of Human Evolution·María Dolores GarraldaBernard Vandermeersch
Jan 15, 2021·Proceedings of the National Academy of Sciences of the United States of America·Keegan R SeligMary T Silcox

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