Furuhata R, Imasaka M, Sugimoto M, Yoshinobu K, Araki M, Araki K. LincRNA-p21 exon 1 expression correlates with Cdkn1a expression in vivo.
Genes Cells 2021;
27:14-24. [PMID:
34808017 DOI:
10.1111/gtc.12906]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 11/03/2021] [Accepted: 11/15/2021] [Indexed: 11/28/2022]
Abstract
LincRNA-p21 is a long intergenic non-coding RNA (LincRNA) gene reported to activate the transcription of the adjacent Cdkn1a (p21) gene in cis. The importance of the enhancer elements in the LincRNA-p21 gene region has also been reported; however, the involvement of the LincRNA-p21 transcripts in regulating Cdkn1a in vivo is still unclear. In this study, we used a LincRNA-p21-trapped mouse line (LincRNA-p21Gt ) in which βgeo was inserted into intron 1, and all enhancer elements were retained. In LincRNA-p21Gt/Gt mice, the transcription of LincRNA-p21 was repressed due to the βgeo sequence, and the expression of exon 1 of LincRNA-p21 was restored through its deletion or replacement by another sequence, and Cdkn1a expression was also upregulated. Furthermore, regardless of the full-length transcripts, the expression of Cdkn1a correlated with the transcription of the exon 1 of LincRNA-p21. This result indicates that the LincRNA-p21 transcripts are not functional, but the transcriptional activity around exon 1 is important for Cdkn1a expression.
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