Genomic imprinting in plants: observations and evolutionary implications

@article{Alleman2004GenomicII,
  title={Genomic imprinting in plants: observations and evolutionary implications},
  author={Mary M. Alleman and John S. Doctor},
  journal={Plant Molecular Biology},
  year={2004},
  volume={43},
  pages={147-161}
}
The epigenetic phenomenon of genomic imprinting occurs among both plants and animals. In species where imprinting is observed, there are parent-of-origin effects on the expression of imprinted genes in offspring. This review focuses on imprinting in plants with examples from maize, where gene imprinting was first described, and Arabidopsis. Our current understanding of imprinting in plants is presented in the context of cytosine methylation and imprinting in mammals, where developmentally… 
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The MEDEA phenotypes provide empirical support for theories of an intragenomic parental conflict during seed development, whereby imprinting is proposed as a means to differentially balance the selfish interests of each sex's genome during the development of the progeny.
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TLDR
The regulation of imprinting in both mammals and flowering plants involves changes in DNA methylation and histone methylation, thus suggesting that the epigenetic signals that regulate imprinting have been co-opted in these distantly related species.
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TLDR
The current understanding of parent-of-origin effects could represent a new form of an Oedipus complex in which flowering plants prefer to rely transcriptionally on their maternal rather than their paternal chromosomes to ensure normal initiation of seed development.
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In this review, it is discussed how alternative polyadenylation sites at the imprinted H13 gene are utilized in an allele-specific way and how other imprinted loci behave similarly.
Genomic Imprinting in Drosophila has properties of both mammalian and insect imprinting
TLDR
It is proposed that repression of somatic replication in polytenized cells, as a secondary response to the imprint, acts to extend the size of the imprinted domain to an entire chromosome, suggesting that genomic imprinting in Drosophila and mammals is not fundamentally different.
Natural epigenetic polymorphisms lead to intraspecific variation in Arabidopsis gene imprinting
TLDR
It is concluded that there is standing variation in imprinting even in recently diverged genotypes due to intraspecific epiallelic variation, and it is demonstrated that epialspecific variation and genomic imprinting intersect to produce novel gene expression patterns in seeds.
Imprinting in plants
  • V. Sokolov
  • Biology, Medicine
    Russian Journal of Genetics
  • 2006
TLDR
This review discusses the modern issues in epigenetic regulation in plants related to the imprinting at the levels of genome, locus, and gene and the issues of potential practical application of imprinting in breeding practice.
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