Abstract
Maintenance of cell identity is a complex task that involves multiple layers of regulation, acting at all levels of chromatin packaging, from nucleosomes to folding of chromosomal domains in the cell nucleus. Polycomb-group (PcG) and trithorax-group (trxG) proteins maintain memory of chromatin states through binding at cis-regulatory elements named PcG response elements or cellular memory modules. Fab-7 is a well-defined cellular memory module involved in regulation of the homeotic gene Abdominal-B (Abd-B). In addition to its action in cis, we show here by three-dimensional FISH that the Fab-7 element leads to association of transgenes with each other or with the endogenous Fab-7, even when inserted in different chromosomes. These long-distance interactions enhance PcG-mediated silencing. They depend on PcG proteins, on DNA sequence homology, and on developmental progression. Once long-distance pairing is abolished by removal of the endogenous Fab-7, the derepressed chromatin state induced at the transgene locus can be transmitted through meiosis into a large fraction of the progeny, even after reintroduction of the endogenous Fab-7. Strikingly, meiotic inheritance of the derepressed state involves loss of pairing between endogenous and transgenic Fab-7. This suggests that transmission of nuclear architecture through cell division might contribute to inheritance of chromatin states in eukaryotes.
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Dates
Type | When |
---|---|
Created | 21 years, 10 months ago (Oct. 1, 2003, 4:04 p.m.) |
Deposited | 3 years, 9 months ago (Nov. 15, 2021, 10:32 p.m.) |
Indexed | 2 months, 2 weeks ago (June 9, 2025, 9:06 a.m.) |
Issued | 21 years, 10 months ago (Oct. 1, 2003) |
Published | 21 years, 10 months ago (Oct. 1, 2003) |
Published Online | 21 years, 10 months ago (Oct. 1, 2003) |
Published Print | 21 years, 10 months ago (Oct. 1, 2003) |
@article{Bantignies_2003, title={Inheritance of Polycomb-dependent chromosomal interactions in Drosophila}, volume={17}, ISSN={1549-5477}, url={http://dx.doi.org/10.1101/gad.269503}, DOI={10.1101/gad.269503}, number={19}, journal={Genes & Development}, publisher={Cold Spring Harbor Laboratory}, author={Bantignies, Frédéric and Grimaud, Charlotte and Lavrov, Sergey and Gabut, Mathieu and Cavalli, Giacomo}, year={2003}, month=oct, pages={2406–2420} }