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Updated: Jun 20, 2026

Single Oocyte Bisulfite Mutagenesis
Published on: June 27, 2012
Gamete-specific epigenetic mechanisms shape genomic imprinting
Pauline Emilie Jullien1, Frédéric Berger
1Temasek Life Sciences Laboratory, 1 Research Link, Department of Biological Sciences, National University of Singapore, 117604 Singapore, Singapore. pjullien@tll.org.sg
Parental imprinting in plants relies on DNA methylation and demethylation. The DEMETER enzyme and Retinoblastoma pathway control this process, ensuring proper gene expression for embryo development.
Area of Science:
- Plant Molecular Biology
- Epigenetics
- Developmental Biology
Background:
- Most genes are expressed equally from both parental alleles.
- Imprinted genes show differential expression based on parental origin.
- In flowering plants, imprinting is regulated by DNA methylation.
Purpose of the Study:
- To investigate the mechanisms of parental imprinting in flowering plants.
- To understand the roles of DNA demethylation and histone methylation in imprinting.
- To explore the conservation of imprinting mechanisms across species.
Main Methods:
- Studied the function of the DNA glycosylase DEMETER and the Retinoblastoma pathway.
- Investigated DNA demethylation during female gametogenesis and its propagation.
- Examined the role of Polycomb Group activity in regulating imprinted genes.
- Identified new imprinted genes in Arabidopsis and maize.
Main Results:
- DEMETER and the Retinoblastoma pathway synergistically activate imprinted alleles via DNA demethylation.
- DNA demethylation initiated in the central cell is propagated to the endosperm.
- Histone methylation by Polycomb Group proteins also regulates imprinted genes.
- New imprinted genes were identified in Arabidopsis and maize, supporting conserved mechanisms.
Conclusions:
- Parental imprinting in plants is a complex epigenetic process involving DNA and histone modifications.
- The DEMETER enzyme plays a crucial role in establishing imprinting patterns.
- Conserved imprinting mechanisms and the influence of distant cis-elements offer avenues for future research.
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