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Substitution of the α-lactalbumin transcription unit by a CAT cDNA within a BAC clone silenced the locus in transgenic mice without affecting the physically linked Cyclin T1 gene

  • Soulier Solange
  • Hudrisier Marthe
  • Da Silva Costa José
  • Maeder Caroline
  • Viglietta Céline
  • Besnard Nathalie
  • Vilotte Jean-LucEmail author
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Abstract

We recently reported that a goat bacterial artificial chromosome (BAC) clone conferred site-independent expression in transgenic mice of the two loci present within its insert, the ubiquitously expressed Cyclin T1 and the mammary specific β-lactalbumin (αlac) genes. To assess if this vector could target mammary-restricted expression of cDNA, the CAT ORF was introduced by homologous recombination in Escherichia coli in place of the αlac transcription unit. The insert of this modified BAC was injected into mice and three transgenic lines were derived. None of these lines expressed the CAT gene suggesting that the use of long genomic inserts is not sufficient to support the expression of intron-less transgenes. The physically linked goat Cyclin T1 locus was found to be active in all three lines. This observation reinforced the hypothesis that the two loci are localised in two separate chromatin domains.

Keywords

bacterial artificial chromosome homologous recombination intron transgenic mice chromatin domain 

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Copyright information

© INRA, EDP Sciences 2003

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors and Affiliations

  • Soulier Solange
    • 1
  • Hudrisier Marthe
    • 1
  • Da Silva Costa José
    • 1
  • Maeder Caroline
    • 2
  • Viglietta Céline
    • 2
  • Besnard Nathalie
    • 1
  • Vilotte Jean-Luc
    • 1
    Email author
  1. 1.Laboratoire de génétique biochimique et de cytogénétique, Département de génétique animaleInstitut national de la recherche agronomiqueJouy-en-Josas CedexFrance
  2. 2.Laboratoire de biologie du développement et de biotechnologie, Département de physiologie animaleInstitut national de la recherche agronomiqueJouy-en-Josas CedexFrance

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