Multitasking by polycomb response elements

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Abstract

Development requires the expression of master regulatory genes necessary to specify a cell lineage. Equally significant is the stable and heritable silencing of master regulators that would specify alternative lineages. This regulated gene silencing is carried out by Polycomb group (PcG) proteins, which must be correctly recruited only to the subset of their target loci that requires lineage-specific silencing. A recent study by Erceg and colleagues (pp. 590–602) expands on a key aspect of that targeting: The same DNA elements that recruit PcG complexes to a repressed locus also encode transcriptional enhancers that function in different lineages where that locus must be expressed. Thus, PcG targeting elements overlap with enhancers.

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Jaensch, E. S., Kundu, S., & Kingston, R. E. (2017). Multitasking by polycomb response elements. Genes and Development, 31(11), 1069–1072. https://doi.org/10.1101/gad.303206.117

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