Document Detail

Quantitative complete tooth variation among east Asians and Native Americans: developmental biology as a tool for the assessment of human divergence.
MedLine Citation:
PMID:  8897209     Owner:  NLM     Status:  MEDLINE    
The quantification of total tooth structure derived from X-rays of Vietnamese, Southern Chinese, Mongolians, Western Eskimos, and Peruvian pre-Inca (Huari Empire) populations was used to examine dental divergence and the morphogenetics of change. Multivariate derived distances between the samples helped identify a quasicontinuous web of ethnic groups with two binary clusters ensconced within the web. One cluster was composed of Mongolians, Western Eskimos, and pre-Inca, and the other group consisted of the Southern Chinese and Vietnamese. Mongolians entered the quasicontinuum from a divergent angle (externally influenced) from that of the Southeast Asians. The Chinese and pre-Inca formed the polar samples of the distance superstructure. The pre-Inca sample was the most isolated, its closest neighbor being the Western Eskimos. Univariate and multivariate analyses suggested that the pre-Inca, whose ancestors arrived in America perhaps approximately 30,000 years ago, was the least derived sample. Clearly, microevolutionary change occurred among the samples, but the dental phenotype was resistant to environmental developmental perturbations. An assessment of dental divergence and developmental biology suggested that the overall dental phenotype is a complex multigenic morphological character, and that the observed variation evolved through total genomic drift. The quantified dental phenotype is greater than its highly multigenic algorithm and its development homeostasis is tightly controlled, or canalized, by the deterministic organization of a complex nonlinear epigenetic milieu. The overall dental phenotype quantified here was selectively neutral and a good character to help reconstruct the sequence of human evolution, but if the outlying homeostatic threshold was or will be exceeded in antecedents and descendants, respectively, evolutionary saltation occurs.
E D Shields
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of craniofacial genetics and developmental biology     Volume:  16     ISSN:  0270-4145     ISO Abbreviation:  J. Craniofac. Genet. Dev. Biol.     Publication Date:    1996 Oct-Dec
Date Detail:
Created Date:  1997-02-04     Completed Date:  1997-02-04     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8109845     Medline TA:  J Craniofac Genet Dev Biol     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  193-207     Citation Subset:  IM    
Department of Oral Biology, Faculty of Dentistry, McGill University, Montreal, Quebec, Canada.
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MeSH Terms
Analysis of Variance
Asia, Southeastern
Genetic Variation*
Indians, North American*
Tooth / growth & development*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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