Titre
DNA hypomethylation perturbs the function and survival of CNS neurons in postnatal animals.
Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
Auteur(s)
Fan, G.
Auteure/Auteur
Beard, C.
Auteure/Auteur
Chen, R.Z.
Auteure/Auteur
Csankovszki, G.
Auteure/Auteur
Sun, Y.
Auteure/Auteur
Siniaia, M.
Auteure/Auteur
Biniszkiewicz, D.
Auteure/Auteur
Bates, B.
Auteure/Auteur
Lee, P.P.
Auteure/Auteur
Kuhn, R.
Auteure/Auteur
Trumpp, A.
Auteure/Auteur
Poon, C.
Auteure/Auteur
Wilson, C.B.
Auteure/Auteur
Jaenisch, R.
Auteure/Auteur
Liens vers les unités
ISSN
1529-2401[electronic]
Statut éditorial
Publié
Date de publication
2001
Volume
21
Numéro
3
Première page
788
Dernière page/numéro d’article
797
Langue
anglais
Résumé
DNA methyltransferase I (Dnmt1), the maintenance enzyme for DNA cytosine methylation, is expressed at high levels in the CNS during embryogenesis and after birth. Because embryos deficient for Dnmt1 die at gastrulation, the role of Dnmt1 in the development and function of the nervous system could not be studied by using this mutation. We therefore used the cre/loxP system to produce conditional mutants that lack Dnmt1 in neuroblasts of embryonic day 12 embryos or in postmitotic neurons of the postnatal animal. Conditional deletion of the Dnmt1 gene resulted in rapid depletion of Dnmt1 proteins, indicating that the enzyme in postmitotic neurons turns over quickly. Dnmt1 deficiency in postmitotic neurons neither affected levels of global DNA methylation nor influenced cell survival during postnatal life. In contrast, Dnmt1 deficiency in mitotic CNS precursor cells resulted in DNA hypomethylation in daughter cells. Whereas mutant embryos carrying 95% hypomethylated cells in the brain died immediately after birth because of respiratory distress, mosaic animals with 30% hypomethylated CNS cells were viable into adulthood. However, these mutant cells were eliminated quickly from the brain within 3 weeks of postnatal life. Thus, hypomethylated CNS neurons were impaired functionally and were selected against at postnatal stages.
Sujets
PID Serval
serval:BIB_20777
PMID
Date de création
2007-11-19T11:15:56.621Z
Date de création dans IRIS
2025-05-20T16:49:18Z