Generation of a conditionally null allele of the laminin alpha 1 gene

Research output: Contribution to journalArticle


Laminins are heterotrimeric glycoproteins of the basement membranes. Laminin 1 (alpha 1, beta 1, gamma 1) is the major laminin expressed during early mouse embryogenesis. To gain access, to the physiological function of laminin alpha 1 chain, we developed a conditionally null allele of its encoding gene (Lama1) using the cre/loxP system. Floxed-allele-carrying mice (Lama1(flox/flox)) display no overt phenotype. Lama1(flox/flox) mice were crossed with transgenic deleter mice (CMV-Cre) to generate Lama1-deficient mice (Lama1(Delta/Delta)). Lama1(Delta/Delta) embryos die during the early postimplantation period after embryonic day 6.5. They lack Reichert's membrane, an extraembryonic basement membrane in which laminin all is normally highly expressed. In parallel, Lama1(Delta/Delta) embryos display 1) parietal and visceral endoderm differentiation defects with altered expression of cytokeratin 19 and GATA4, respectively, and 2) an induction of apoptosis. This new mouse model is of particular interest as it will allow time- and tissue-specific inactivation of the Lamal gene in various organs. genesis 43:59-70, 2005.


  • F Alpy
  • I Jivkov
  • Lydia Sorokin
  • A Klein
  • C Arnold
  • Y Huss
  • M Kedinger
  • R Simon-Assmann
  • O Lefebvre
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Cancer and Oncology


  • Reichert's membrane, development, apoptosis, GATA4, conditional inactivation, Lama1 genes, knockout, basement membrane
Original languageEnglish
Pages (from-to)59-70
JournalGenesis: The Journal of Genetics and Development
Issue number2
Publication statusPublished - 2005
Publication categoryResearch

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Pathology, (Lund) (013030000)