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Genomic imprinting in the placenta.

A Wagschal¹, R Feil

¹Institute of Molecular Genetics, CNRS and University of Montpellier II, Montpellier, France.

Cytogenetic and Genome Research

|April 1, 2006

Summary

Genomic imprinting in mouse placenta involves maternal gene activation and paternal repression. This epigenetic process utilizes histone modifications and non-coding RNAs, similar to imprinted X chromosome inactivation.

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Area of Science:

Epigenetics
Developmental Biology
Genomics

Background:

Genomic imprinting is a crucial epigenetic mechanism for mammalian development, particularly in extra-embryonic tissues.
In mice, autosomal genes imprinted in the placenta show maternal allele activity and paternal allele repression.

Purpose of the Study:

To investigate the mechanisms underlying placenta-specific genomic imprinting in mice.
To explore the relationship between autosomal imprinting and imprinted X chromosome inactivation in the placenta.

Main Methods:

Analysis of gene expression patterns in mouse extra-embryonic tissues.
Investigation of epigenetic modifications, including DNA methylation, histone modifications, and non-coding RNAs.

Main Results:

Placenta-specific imprinted autosomal genes are maternally active and paternally repressed.
Paternal silencing of these genes is independent of somatic DNA methylation maintenance.
Evidence suggests repressive histone modifications and non-coding RNAs mediate this imprinting.

Conclusions:

Placenta-specific imprinting in mice involves novel epigenetic mechanisms beyond DNA methylation.
The observed similarities suggest an evolutionary link between autosomal imprinting and imprinted X chromosome inactivation in the placenta.

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