Volume 40, Issue 3 p. 216-221
Original Article

TNF promoter SNP variation in Amerindians and white-admixed women from Misiones, Argentina

I. Badano

Corresponding Author

I. Badano

Laboratorio de Biología Molecular Aplicada, Facultad de Ciencias Exactas, Quimicas y Naturales, Universidad Nacional de Misiones, Misiones, Argentina

Correspondence: Ines Badano, PhD., Laboratorio de Biología Molecular Aplicada, Universidad Nacional de Misiones, Av. Mariano Moreno 1375 - Posadas, Misiones 3300, Argentina. Tel/Fax: +54 376 4435118; E-mail: [email protected]Search for more papers by this author
T. G. Schurr

T. G. Schurr

Laboratory of Molecular Anthropology, Department of Anthropology, University of Pennsylvania, Philadelphia, PA, USA

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S. M. Stietz

S. M. Stietz

Laboratorio de Biología Molecular Aplicada, Facultad de Ciencias Exactas, Quimicas y Naturales, Universidad Nacional de Misiones, Misiones, Argentina

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M. C. Dulik

M. C. Dulik

Laboratory of Molecular Anthropology, Department of Anthropology, University of Pennsylvania, Philadelphia, PA, USA

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M. Mampaey

M. Mampaey

Ministerio de Salud Pública de la Provincia de Misiones, Misiones, Argentina

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I. M. Quintero

I. M. Quintero

Laboratorio de Biología Molecular Aplicada, Facultad de Ciencias Exactas, Quimicas y Naturales, Universidad Nacional de Misiones, Misiones, Argentina

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J. B. Zinovich

J. B. Zinovich

Ministerio de Salud Pública de la Provincia de Misiones, Misiones, Argentina

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R. H. Campos

R. H. Campos

Cátedra de Virología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina

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D. J. Liotta

D. J. Liotta

Laboratorio de Biología Molecular Aplicada, Facultad de Ciencias Exactas, Quimicas y Naturales, Universidad Nacional de Misiones, Misiones, Argentina

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First published: 18 October 2012
Citations: 5

Summary

The aim of this study is to describe genetic variation in the TNF promoter in the ethnically diverse population of Misiones, north-eastern Argentina. We analysed 210 women including 66 Amerindians of the Mbya-Guarani ethnic group and 144 white-admixed individuals from urban and rural areas of Misiones. Their DNA samples were surveyed for TNF polymorphisms -376 A/G, -308 A/G -244 A/G and -238 A/G by PCR amplification and direct sequencing and for the Amerindian marker -857 C/T by real-time PCR. Our main findings are as follows:(i) a distinctive pattern of Single Nucleotide Polymorphism (SNP) distribution among these groups, (ii) genetic differentiation between the Mbya-Guarani and the white-admixed populations (< 0.05), (iii) lower gene diversity (~0.05) in Mbya-Guarani compared with the white-admixed group (~0.21); and (iv) linkage disequilibrium between the -376A and -238A SNPs in white-admixed populations. These data highlight the principal role of population history in establishing present-day genetic variation at the TNF locus and provide a framework for undertaking ethnographic and disease association studies in Misiones.

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