TL;DR
This chapter speculates that physical in trans interactions could be involved in paramutation as well, and potential mechanisms will be discussed in light of recent data obtained for the b1 locus.
FAIRE analysis on these mutants suggests that the occurrence of physical interactions appears not dependent on a particular chromatin state, and a B-I -like multi-loop structure mediates high b1 expression.
Paramutation is an interaction of alleles resulting in heritable gene silencing, but the molecular events that initiate paramutation are largely unknown. We observed unexpected silencing of the maize P1-rr gene by p1 alleles containing two nearby Ac/fAc transposable elements. A panel of derivative alleles containing th...
Epigenetic inheritance provides mutation-free mechanisms for phenotypic adaptation, including modifications to DNA or DNA-associated proteins that create patterns of heritable gene regulation. However, the limits and regulation of this inheritance remain incompletely understood. Here, we developed a C. elegans system t...
The results uncover an intricate interplay between active and silent epigenetic features present at the b1 locus in a mop1 background, resulting in elevated expression of B’, concluding that MOP1 is essential to maintain the B’ silent chromatin state.
Recent advances that provide further evidence supporting imprinting are discussed, implying that, despite the differences, the core mechanism, the H3K9me3:HP1:H4K20me3 pathway, is evolutionarily conserved across animal phyla.
In animals, plants, and some fungi, Polycomb Repressive Complex 2 (PRC2) catalyzes trimethylation of histone H3 lysine 27 (H3K27me3) to establish transcriptionally repressed chromatin. Here, we identify the histone acetyltransferase RTT109 as a key regulator of PRC2-repressed domains in the model fungus Neurospora cras...
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