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Human Genetics

, Volume 130, Issue 4, pp 483–493 | Cite as

The −14010*C variant associated with lactase persistence is located between an Oct-1 and HNF1α binding site and increases lactase promoter activity

  • Tine G. K. Jensen
  • Anke Liebert
  • Rikke Lewinsky
  • Dallas M. Swallow
  • Jørgen Olsen
  • Jesper T. Troelsen
Original Investigation

Abstract

In most people worldwide intestinal lactase expression declines in childhood. In many others, particularly in Europeans, lactase expression persists into adult life. The lactase persistence phenotype is in Europe associated with the −13910*T single nucleotide variant located 13,910 bp upstream the lactase gene in an enhancer region that affects lactase promoter activity. This variant falls in an Oct-1 binding site and shows greater Oct-1 binding than the ancestral variant and increases enhancer activity. Several other variants have been identified very close to the −13910 position, which are associated with lactase persistence in the Middle East and Africa. One of them, the −14010*C, is associated with lactase persistence in Africa. Here we show by deletion analysis that the −14010 position is located in a 144 bp region that reduces the enhancer activity. In transfections the −14010*C allele shows a stronger enhancer effect than the ancestral −14010*G allele. Binding sites for Oct-1 and HNF1α surrounding the −14010 position were identified by gel shift assays, which indicated that −14010*C has greater binding affinity to Oct-1 than −14010*G.

Keywords

Lactase Enhancer Activity Lactase Persistence HNF1 Site Enhancer Construct 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

LCT

Lactase gene

LPH

Lactase-phlorizin hydrolase

LP

Lactase persistence

LNP

Lactase non-persistence

MCM6

Minichromosome maintenance 6 gene

SNP

Single nucleotide polymorphism

Notes

Acknowledgments

We thank Lotte Bram for excellent technical assistance. This work was supported by the Lundbeck Foundation, the Augustinus Foundation, Aase and Ejnar Danielsen Foundation, the Danish Research Council and EU FP7 ITN Grant 215362-2 (LeCHE).

Supplementary material

439_2011_966_MOESM1_ESM.docx (32 kb)
Supplementary material 1 (DOCX 32 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Tine G. K. Jensen
    • 1
  • Anke Liebert
    • 2
  • Rikke Lewinsky
    • 1
  • Dallas M. Swallow
    • 2
  • Jørgen Olsen
    • 1
  • Jesper T. Troelsen
    • 1
    • 3
  1. 1.Department of Cellular and Molecular Medicine, Panum Institute, Building 6.4University of CopenhagenCopenhagen NDenmark
  2. 2.Research Department of Genetics, Evolution and EnvironmentUniversity College LondonLondonUK
  3. 3.Department of Sciences, Systems and ModelsUniversity of RoskildeRoskildeDenmark

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