What question did this study set out to answer?

To examine the long-term relationships between progressive DNA demethylation, heterochromatin condensation, and chromosomal instability during extended culture.

January 1, 2000Cytogenetic and Genome Research

DNA methylation and chromosome instability in lymphoblastoid cell lines

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Authors

AVA. VilainCentre National de la Recherche Scientifique JBJacqueline Bernardino-SgherriInstitut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement MGM. Gerbault-SeureauCentre National de la Recherche Scientifique

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Implication

In vitro longitudinal analysis reveals sequence-dependent chromosomal instability following DNA demethylation in cultured human lymphoblastoid cells, indicating chromatin structure modulates...

Key Points

To examine the long-term relationships between progressive DNA demethylation, heterochromatin condensation, and chromosomal instability during extended culture.
Followed the chromosomal and molecular evolution of four Epstein-Barr virus-transformed human lymphoblastoid cell lines maintained in continuous culture for more than 2 years.
Evaluated methylation status and metaphase condensation across classical satellite-rich heterochromatic regions of chromosomes 1, 9, 16, and Y, alongside mRNA quantification of DNMT1, DNMT3A, DNMT3B, and DNA demethylase.
Demethylation of satellite 2-rich heterochromatic regions on chromosomes 1 and 16 directly correlated with metaphase undercondensation and non-clonal chromosomal rearrangements.
Satellite 3-rich heterochromatic regions on chromosomes 9 and Y maintained condensation and structural stability despite marked demethylation.
Chromosomal instability and genome-wide demethylation occurred independently of mRNA expression levels of DNMT1, DNMT3A, DNMT3B, or DNA demethylase.

Cite This Study

Vilain et al. (2000) studied this question.

synapsesocial.com/papers/6a1ffa2fc1b320180d0dbab9 https://doi.org/10.1159/000015641

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Implication

In vitro longitudinal analysis reveals sequence-dependent chromosomal instability following DNA demethylation in cultured human lymphoblastoid cells, indicating chromatin structure modulates...