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. 1991 Dec 15;88(24):11300–11304. doi: 10.1073/pnas.88.24.11300

Methylation changes in the apolipoprotein AI gene during embryonic development of the mouse.

R Shemer 1, T Kafri 1, A O'Connell 1, S Eisenberg 1, J L Breslow 1, A Razin 1
PMCID: PMC53122  PMID: 1763043

Abstract

We report here a detailed study of developmental changes in the methylation status of specific sites in a single-copy tissue-specific gene, from the germ cell through the early embryo to adult tissues. Two sites at the 5' end of the mouse apolipoprotein AI gene were unmethylated in the ovulated unfertilized oocytes and methylated in the sperm. In contrast, a third site, located upstream of the gene, was methylated and a CpG island within the gene was unmethylated in both oocyte and sperm. The methylated sites, regardless of maternal or paternal origin, underwent demethylation in the early embryo (8-16 cells) and stayed unmethylated through the late blastocyst stage. During gastrulation, non-CpG island sites underwent methylation, followed by gradual demethylation at specific sites in tissues parallel to expression of the gene (liver and intestine). The formation of the mature tissue-specific methylation pattern of the apolipoprotein AI gene, therefore, involves the following three major events: (i) erasure of the germ-cell methylation pattern (at the 8- to 16-cell stage), (ii) formation of a new methylation pattern by de novo methylation of non-CpG island sites (during gastrulation), and (iii) tissue-specific demethylation associated with the onset of expression of the gene.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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