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Showing content from https://link.springer.com/doi/10.1007/s00439-005-1322-z below:

Microsatellite variation and evolution of human lactase persistence

Abstract

The levels of haplotype diversity within the lineages defined by two single-nucleotide polymorphisms (SNPs) (−13910 C/T and −22018 G/A) associated with human lactase persistence were assessed with four fast-evolving microsatellite loci in 794 chromosomes from Portugal, Italy, Fulbe from Cameroon, São Tomé and Mozambique. Age estimates based on the intraallelic microsatellite variation indicate that the −13910*T allele, which is more tightly associated with lactase persistence, originated in Eurasia before the Neolithic and after the emergence of modern humans outside Africa. We detected significant departures from neutrality for the −13910*T variant in geographically and evolutionary distant populations from southern Europe (Portuguese and Italians) and Africa (Fulbe) by using a neutrality test based on the congruence between the frequency of the allele and the levels of intraallelic variability measured by the number of mutations in adjacent microsatellites. This result supports the role of selection in the evolution of lactase persistence, ruling out possible confounding effects from recombination suppression and population history. Reevaluation of the available evidence on variation of the −13910 and −22018 loci indicates that lactase persistence probably originated from different mutations in Europe and most of Africa, even if 13910*T is not the causal allele, suggesting that selective pressure could have promoted the convergent evolution of the trait. Our study shows that a limited number of microsatellite loci may provide sufficient resolution to reconstruct key aspects of the evolutionary history of lactase persistence, providing an alternative to approaches based on large numbers of SNPs.

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Acknowledgements

We thank Luís Pedro Resende and Cinzia Battaggia for assistance in typing the Portuguese and Italian samples, respectively. We are also grateful to Gabriella Spedini for the Fulbe DNA samples and to António Prista and Sílvio Saranga for the Mozambique samples. We thank Eduardo Tarazona-Santos and Nuno Ferrand for comments on the manuscript. This research was supported by the Sociedade Portuguesa de Gastrenterologia and by the Fundação para a Ciência e a Tecnologia (grants POCTI/42510/ANT/2001 and POCTI/BIA-BDE/56654/2004). D.L. and G.D.B. were supported by the M.I.U.R. (grant numbers 2003054059 and 2005058414).

Author information Authors and Affiliations
  1. Instituto de Patologia e Imunologia Molecular da Universidade do Porto (IPATIMUP), R. Dr. Roberto Frias s/n, 4200-465, Porto, Portugal

    Margarida Coelho, Susana Seixas & Jorge Rocha

  2. Departamento de Zoologia Antropologia, Faculdade de Ciências, Universidade do Porto, Porto, Portugal

    Margarida Coelho & Jorge Rocha

  3. Dipartimento di Biologia Evoluzionistica Sperimentale, Universita di Bologna, Bologna, Italia

    Donata Luiselli

  4. Sezione di Biologia Evolutiva, Dipartimento di Biologia, Universitá di Ferrara, Ferrara, Italia

    Giorgio Bertorelle

  5. Unidade de Gastrenterologia Pediátrica, Hospital de Santa Maria, Lisbon, Portugal

    Ana Isabel Lopes

  6. Dipartimento di Biologia Animale e dell’ Uomo, Universitá “La Sapienza”, Rome, Italy

    Giovanni Destro-Bisol

  7. Istituto Italiano di Antropologia, Rome, Italy

    Giovanni Destro-Bisol

Authors
  1. Margarida Coelho
  2. Donata Luiselli
  3. Giorgio Bertorelle
  4. Ana Isabel Lopes
  5. Susana Seixas
  6. Giovanni Destro-Bisol
  7. Jorge Rocha
Corresponding author

Correspondence to Jorge Rocha.

Electronic Supplementary Material About this article Cite this article

Coelho, M., Luiselli, D., Bertorelle, G. et al. Microsatellite variation and evolution of human lactase persistence. Hum Genet 117, 329–339 (2005). https://doi.org/10.1007/s00439-005-1322-z

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