CCAT1 lncRNA is chromatin-retained and post-transcriptionally spliced.
CCAT1
MYC
PVT1
Post-transcriptional splicing
RNA FISH
Transcription site
Journal
Histochemistry and cell biology
ISSN: 1432-119X
Titre abrégé: Histochem Cell Biol
Pays: Germany
ID NLM: 9506663
Informations de publication
Date de publication:
19 May 2024
19 May 2024
Historique:
accepted:
22
04
2024
medline:
20
5
2024
pubmed:
20
5
2024
entrez:
19
5
2024
Statut:
aheadofprint
Résumé
Super-enhancers are unique gene expression regulators widely involved in cancer development. Spread over large DNA segments, they tend to be found next to oncogenes. The super-enhancer c-MYC locus forms long-range chromatin looping with nearby genes, which brings the enhancer and the genes into proximity, to promote gene activation. The colon cancer-associated transcript 1 (CCAT1) gene, which is part of the MYC locus, transcribes a lncRNA that is overexpressed in colon cancer cells through activation by MYC. Comparing different types of cancer cell lines using RNA fluorescence in situ hybridization (RNA FISH), we detected very prominent CCAT1 expression in HeLa cells, observed as several large CCAT1 nuclear foci. We found that dozens of CCAT1 transcripts accumulate on the gene locus, in addition to active transcription occurring from the gene. The accumulating transcripts are released from the chromatin during cell division. Examination of CCAT1 lncRNA expression patterns on the single-RNA level showed that unspliced CCAT1 transcripts are released from the gene into the nucleoplasm. Most of these unspliced transcripts were observed in proximity to the active gene but were not associated with nuclear speckles in which unspliced RNAs usually accumulate. At larger distances from the gene, the CCAT1 transcripts appeared spliced, implying that most CCAT1 transcripts undergo post-transcriptional splicing in the zone of the active gene. Finally, we show that unspliced CCAT1 transcripts can be detected in the cytoplasm during splicing inhibition, which suggests that there are several CCAT1 variants, spliced and unspliced, that the cell can recognize as suitable for export.
Identifiants
pubmed: 38763947
doi: 10.1007/s00418-024-02294-w
pii: 10.1007/s00418-024-02294-w
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Israel Science Foundation
ID : 1278/18
Informations de copyright
© 2024. The Author(s).
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