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Genome imprinting regulated by the mouse Polycomb group protein Eed
Jesse Mager1, Nathan D Montgomery, Fernando Pardo-Manuel de Villena
1Department of Genetics and Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, 103 Mason Farm Road, Chapel Hill, North Carolina 27599-7264, USA.
Nature Genetics
|March 11, 2003
Summary
The embryonic ectoderm development (Eed) gene is crucial for regulating gene expression based on parental origin. Eed deficiency disrupts the silencing of specific genes on autosomes, impacting epigenetic regulation.
Area of Science:
- Epigenetics and Gene Regulation
- Developmental Biology
- Genomics
Background:
- Epigenetic mechanisms control gene expression timing, tissue specificity, and parent-of-origin effects.
- The Polycomb group (PcG) gene Eed (embryonic ectoderm development) is known to maintain X chromosome imprinting.
- The role of Eed in regulating autosomal imprinted loci remains largely unexplored.
Purpose of the Study:
- To investigate the requirement of Eed for the regulation of autosomal imprinted loci.
- To determine if Eed influences parent-of-origin-dependent gene expression beyond the X chromosome.
Main Methods:
- Analysis of gene expression in Eed-deficient (Eed-/-) mouse embryos.
- Assessment of DNA methylation status at differentially methylated regions (DMRs) in affected and unaffected imprinted loci.
Main Results:
- Eed deficiency led to the expression of transcripts from the normally silent alleles of certain paternally repressed autosomal genes.
- Parent-of-origin methylation patterns were maintained, but specific CpG methylation changes were observed in DMRs of affected loci.
- Unaffected imprinted loci did not show these methylation changes, indicating locus-specific effects of Eed.
Conclusions:
- Eed is essential for the proper epigenetic regulation of a subset of autosomal imprinted loci.
- Eed functions as a trans-acting factor involved in maintaining parent-of-origin-specific gene silencing.
- These findings expand the known functions of Eed in epigenetic control and imprinting.