Craniometric Similarities Within and Between Human Populations in Comparison with Neutral Genetic Data

Autor(es)

Strauss, Andre ^[1] ; Hubbe, Mark ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Biociencias, Dept Genet & Biol Evolut, BR-05508090 Sao Paulo - Brazil

^[2] Univ Catolica Norte, Inst Invest Arqueol & Museo, San Pedro De Atacama 1410000 - Chile

• Tipo de documento: Artigo Científico
• Fonte: HUMAN BIOLOGY; v. 82, n. 3, p. 315-330, JUN 2010.
• Citações Web of Science: 14

Resumo

The statement that pairs of individuals from different populations are often more genetically similar than pairs from the same population is a widespread idea inside and outside the scientific community. Witherspoon et al. {[}{''}Genetic similarities within and between human populations,{''} Genetics 176:351-359 (2007)] proposed an index called the dissimilarity fraction (omega) to access in a quantitative way the validity of this statement for genetic systems. Witherspoon demonstrated that, as the number of loci increases, omega decreases to a point where, when enough sampling is available, the statement is false. In this study, we applied the dissimilarity fraction to Howells's craniometric database to establish whether or not similar results are obtained for cranial morphological traits. Although in genetic studies thousands of loci are available, Howells's database provides no more than 55 metric traits, making the contribution of each variable important. To cope with this limitation, we developed a routine that takes this effect into consideration when calculating. omega Contrary to what was observed for the genetic data, our results show that cranial morphology asymptotically approaches a mean omega of 0.3 and therefore supports the initial statement-that is, that individuals from the same geographic region do not form clear and discrete clusters-further questioning the idea of the existence of discrete biological clusters in the human species. Finally, by assuming that cranial morphology is under an additive polygenetic model, we can say that the population history signal of human craniometric traits presents the same resolution as a neutral genetic system dependent on no more than 20 loci. (AU)

• Processo FAPESP: 08/51747-0 - Caracterização das práticas mortuárias dos caçadores-coletores pré-históricos da Lapa do Santo, Lagoa Santa (MG)
• Beneficiário: André Menezes Strauss
• Modalidade de apoio: Bolsas no Brasil - Mestrado