Translator Disclaimer
1 October 2013 Genetic Variation of X-STRs in the Wichí Population from Chaco Province, Argentina
Laura Angela Glesmann, Pablo Francisco Martina, Cecilia Inés Catanesi
Author Affiliations +
Abstract

The Wiehí people from Chaco Province inhabit the region called Impenetrable Chaqueño, where the climatic conditions are extreme. Besides scarce communication with the main urban centers, the cultural patterns of the Wichí cause these communities to live in certain degree of isolation. The effect of this situation is an increased genetic differentiation from other populations, as it was observed through autosomal and Y chromosome markers. However, the genetic variation of X chromosome has not yet been fully analyzed. The patterns of allele distribution of different markers of X chromosome can be highly informative in comparative studies, because its special features make this chromosome a potential source to uncover ethnic differences.

The aim of this study was to assess the variation of X chromosome present in the Wichi population living around Misión Nueva Pompeya, in Chaco Province, and to identify particular variation of X-repetitive markers (short tandem repeats, X-STRs) in Chaco Amerindians. We genotyped Wichí for 10 noncoding X-STRs and compared them with a Mocoví population and with published data on individuals coming from European immigration.

We found high homozygote proportion and linkage disequilibrium values for the X chromosome in the Wichí population. The data showed the Wichí to be more distant from nonnative people than was the Mocoví population analyzed for comparison. We also found certain differences with Mocoví, possibly due to a higher genetic flow of the latter with nonnatives. A process of genetic drift seems to be enhanced by the social behavior of the Wichí, since they live apart from other native and nonnative groups. The geographic isolation and the extreme environmental conditions can also be considered as major factors contributing to the population differentiation. Although we found no new allele or undescribed variation, the whole pattern of variation for these markers gives the Wichí a particular population identity.

© 2014 Wayne State University Press, Detroit, Michigan 48201-1309
Laura Angela Glesmann, Pablo Francisco Martina, and Cecilia Inés Catanesi "Genetic Variation of X-STRs in the Wichí Population from Chaco Province, Argentina," Human Biology 85(5), 687-697, (1 October 2013). https://doi.org/10.3378/027.085.0503
Received: 20 March 2013; Accepted: 1 June 2013; Published: 1 October 2013
JOURNAL ARTICLE
11 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top