Stable C0T-1 repeat RNA is abundant and is associated with euchromatic interphase chromosomes
Department of Cell and Developmental Biology; School of Medicine
Cell Anatomy | Cell Biology | Genetics | Molecular Genetics
Recent studies recognize a vast diversity of noncoding RNAs with largely unknown functions, but few have examined interspersed repeat sequences, which constitute almost half our genome. RNA hybridization in situ using C0T-1 (highly repeated) DNA probes detects surprisingly abundant euchromatin-associated RNA comprised predominantly of repeat sequences (C0T-1 RNA), including LINE-1. C0T-1-hybridizing RNA strictly localizes to the interphase chromosome territory in cis and remains stably associated with the chromosome territory following prolonged transcriptional inhibition. The C0T-1 RNA territory resists mechanical disruption and fractionates with the nonchromatin scaffold but can be experimentally released. Loss of repeat-rich, stable nuclear RNAs from euchromatin corresponds to aberrant chromatin distribution and condensation. C0T-1 RNA has several properties similar to XIST chromosomal RNA but is excluded from chromatin condensed by XIST. These findings impact two "black boxes" of genome science: the poorly understood diversity of noncoding RNA and the unexplained abundance of repetitive elements.
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Citation: Hall LL, Carone DM, Gomez AV, Kolpa HJ, Byron M, Mehta N, Fackelmayer FO, Lawrence JB. Stable C0T-1 repeat RNA is abundant and is associated with euchromatic interphase chromosomes. Cell. 2014 Feb 27;156(5):907-19. doi:10.1016/j.cell.2014.01.042. Link to article on publisher's site
Hall, Lisa L.; Carone, Dawn M.; Gomez, Alvin V.; Kolpa, Heather J.; Byron, Meg; Mehta, Nitish; Fackelmayer, Frank O.; and Lawrence, Jeanne B., "Stable C0T-1 repeat RNA is abundant and is associated with euchromatic interphase chromosomes" (2014). Lawrence Lab Publications. 10.