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Comment
. 2018 Jul 16;46(2):132-134.
doi: 10.1016/j.devcel.2018.06.022.

A lncRNA-like Role for LINE1s in Development

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Comment

A lncRNA-like Role for LINE1s in Development

Drew D Honson et al. Dev Cell. .

Abstract

Transposable elements (TEs) have profoundly affected the evolution of transcriptional and chromatin profiles in mammalian genomes. In a recent paper, Percharde et al. (2018) identify a lncRNA-like function for LINE1 transposable elements in regulating gene expression to facilitate embryonic stem cell self-renewal and preimplantation development.

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Figure 1.
Figure 1.. LINE1 Depletion Experiments and Model for LINE1 lncRNA-like Function
(A) Percharde et al. (2018) depleted LINE1 RNAin mouseembryonic stem cells(mESCs) and zygotes. Both ESCs and early embryos exhibited increased 2C-stage gene expression. ESCs displayed loss of selfrenewal, reduced rDNA transcription, and lower total RNA and nascent transcription. Zygotes exhibited lower chromosome accessibility and reduced zygotic genome activation. (B) The authors propose that LINE1 RNA binds Nucleolin and KAP1 and interacts with the genome at Dux and rDNA loci. At the Dux locus, the complex represses transcription, whereas at rDNA it promotes expression of rRNAand riboproteins, facilitating the self-renewal of ESCs and thetransition through early preimplantation development.

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