Co-evolution of X-chromosome inactivation and imprinting in mammals

@article{Reik2005CoevolutionOX,
  title={Co-evolution of X-chromosome inactivation and imprinting in mammals},
  author={Wolf Reik and Annabelle Lewis},
  journal={Nature Reviews Genetics},
  year={2005},
  volume={6},
  pages={403-410}
}
  • W. Reik, A. Lewis
  • Published 1 May 2005
  • Biology, Medicine
  • Nature Reviews Genetics
Recent studies have revealed mechanistic parallels between imprinted X-chromosome inactivation and autosomal imprinting. We suggest that neither mechanism was present in ancestral egg-laying mammals, and that both arose when the evolution of the placenta exerted selective pressure to imprint growth-related genes. We also propose that non-coding RNAs and histone modifications were adopted for the imprinting of growth suppressors on the X chromosome and on autosomes. This provides a unified… 
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TLDR
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Random X Inactivation and Extensive Mosaicism in Human Placenta Revealed by Analysis of Allele-Specific Gene Expression along the X Chromosome
TLDR
It is shown that XCI is random in human placenta, and that this organ is arranged in relatively large patches of cells with either maternal or paternal inactive X, which combined with the extensive mosaicism found in placente can explain the lack of agreement among previous studies.
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