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. 2021 Oct 6;9:735527. doi: 10.3389/fcell.2021.735527

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Copyright © 2021 Trigiante, Blanes Ruiz and Cerase.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Repetitive RNAs in heterochromatin maintenance. (A) Centromeric (dark yellow) and telomeric (light yellow) constitutive heterochromatin and their associated ncRNAs (HOR and TERRA, respectively). ncRNA repeats (TERRA) or its length (HOR) are shown. (B) Xist RNA repeats and their roles in facultative heterochromatin establishment on the X chromosome are shown. Xist RNA is shown as gray molecules around the X inactivation center, H3K9me3 is shown as red dots, bidirectional arrows show the spreading in 2D, single pointed arrows indicate Xist transcription (see main text for more details). (C) A schematic representation of a classic/generic Imprinting Control Region (ICR) and its associated RNAs, in imprinting. Genes, DMR (differentially methylated regions) and lncRNAs are shown (see text for more details).