Original Research Article
Microevolutionary processes due to landscape features in the province of Jujuy (Argentina)
Article first published online: 10 NOV 2010
Copyright © 2010 Wiley-Liss, Inc.
American Journal of Human Biology
Volume 23, Issue 2, pages 177–184, March/April 2011
How to Cite
Gómez-Pérez, L., Alfonso-sánchez, M. A., Dipierri, J. E., Alfaro, E., García-Obregón, S., De Pancorbo, M. M., Bailliet, G. and Peña, J. A. (2011), Microevolutionary processes due to landscape features in the province of Jujuy (Argentina). Am. J. Hum. Biol., 23: 177–184. doi: 10.1002/ajhb.21098
- Issue published online: 11 FEB 2011
- Article first published online: 10 NOV 2010
- Manuscript Accepted: 9 AUG 2010
- Manuscript Revised: 3 AUG 2010
- Manuscript Received: 28 MAY 2010
- Programa de Subvención a Grupos Consolidados, Departamento de Educación, Universidades e Investigación
- Basque Government. Grant Number: IT-424-07
- University of the Basque Country
Objectives: We seek to evaluate the influence of a diverse and rugged physical environment on the genetic background of human populations.
Methods: We analyzed eight polymorphic Alu insertions in 226 individuals from Jujuy province (Argentina), which is composed of several regions with well-defined geographical features and marked contrasts between them associated with differences in altitude (range: 700-3300 m). This regional division was used to assess the spatial variation of the Alu diversity.
Results: Deviations from Hardy-Weinberg Equilibrium expectations resulting from heterozygous deficit were found for FXIIIB and PV92 in the highest subpopulations. Several Alu elements showed genetic heterogeneity between the highest region (La Puna) and the lowest regions (Valle and Selva). Similarly, a decreasing trend of the average heterozygosity according to altitude was found. Both the centroid method and the admixture analysis unveiled a gene flow above the average in lowland populations, indicating a higher proportion of foreign genes introduced by immigrants of European and African ancestry. Furthermore, several Alu frequency clines fitting the orientation of the altitude gradient were detected.
Conclusions: Our study reveals a spatial patterning of the Alu diversity in Jujuy, most likely determined by disparities in landscape and environmental features between the different subregions. Differences in the physical environment would have drastically reduced the homogenizing effects of the gene flow and would have promoted genetic drift episodes in the highest subpopulations. Microevolutionary processes detected in Jujuy have played an important role in the shaping of the gene pool of the populations from this sub-Andean zone from Argentina. Am. J. Hum. Biol., 2010. © 2010 Wiley-Liss, Inc.