What question did this study set out to answer?

To determine how targeted disruption of the DNA methyltransferases Dnmt3a and Dnmt3b influences DNA methylation, genomic stability, and cell proliferation in mouse embryonic fibroblasts.

March 10, 2005Journal of Biological ChemistryOpen Access

Inactivation of Dnmt3b in Mouse Embryonic Fibroblasts Results in DNA Hypomethylation, Chromosomal Instability, and Spontaneous Immortalization

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To determine how targeted disruption of the DNA methyltransferases Dnmt3a and Dnmt3b influences DNA methylation, genomic stability, and cell proliferation in mouse embryonic fibroblasts.
Generated and analyzed mouse embryonic fibroblast (MEF) cultures with constitutive or conditional deletions of Dnmt3a or Dnmt3b.
Assessed global DNA methylation status, karyotypic abnormalities, cell cycle progression, and p53/p21 checkpoint pathway responses following DNA damage.
Loss of Dnmt3b, but not Dnmt3a, caused partial genome-wide DNA hypomethylation alongside aneuploidy, polyploidy, chromosomal breaks, and fusions.
Inactivation of Dnmt3b led to divergent cell fates, prompting either premature senescence or spontaneous immortalization.
Immortalized Dnmt3b-deficient cells maintained an intact DNA damage-induced p53 checkpoint while displaying elevated p21 levels in the absence of p53 induction.

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Implication

Experimental study reveals that Dnmt3b loss causes DNA hypomethylation and genomic instability in mouse fibroblasts, indicating a p53-independent pathway to immortalization.

Cite This Study

Dodge et al. (2005) studied this question.

synapsesocial.com/papers/6a7a3f66a51ded8e7b32a092 https://doi.org/10.1074/jbc.m413246200

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Implication

Experimental study reveals that Dnmt3b loss causes DNA hypomethylation and genomic instability in mouse fibroblasts, indicating a p53-independent pathway to immortalization.

Inactivation of Dnmt3b in Mouse Embryonic Fibroblasts Results in DNA Hypomethylation, Chromosomal Instability, and Spontaneous Immortalization

Key Points

Discussion

Implication

Cite This Study

Inactivation of Dnmt3b in Mouse Embryonic Fibroblasts Results in DNA Hypomethylation, Chromosomal Instability, and Spontaneous Immortalization

Key Points

Discussion

Implication

Cite This Study

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