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ARID1A loss derepresses human endogenous retrovirus-H to modulate BRD4-dependent transcription

Yu, C.; Lei, X.; Chen, F.; Mao, S.; Lv, L.; Liu, H.; Hu, X.; Wang, R.; Shen, L.; Zhang, N.; Meng, Y.; Shen, Y.; Li, P.; Huang, S.; Shao, H.; Lin, C.; Zhang, Z.; Yuan, K.

2021-06-28 cancer biology
10.1101/2021.06.28.450127 bioRxiv
Show abstract

The transposable elements (TEs) through evolutionary exaptation have become an integral part of human genome, offering ample regulatory sequences and shaping chromatin 3D architecture. While the functional impacts of TE-derived sequences on early embryogenesis are recognized, their role in malignancy has only started to emerge. Here we show that many TEs, especially the pluripotency-related endogenous retrovirus H (HERVH), are abnormally activated in colorectal cancer (CRC) samples. The transcriptional upregulation of HERVH is associated with mutations of several tumor suppressors including ARID1A. Knockout of ARID1A in CRC cells leads to increased accessibility at HERVH loci and enhanced transcription, which is dependent on ARID1B. Suppression of HERVH in CRC cells and patient-derived organoids impairs tumor growth. Mechanistically, HERVH transcripts colocalize with nuclear BRD4 foci, modulate their dynamics, and co-regulate many target genes. Altogether, we uncover a critical role for ARID1A in restraining HERVH, which can promote tumorigenesis by stimulating BRD4-dependent transcription when ARID1A is mutated.

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