Waking up dormant tumor suppressor genes with zinc fingers, TALEs and the CRISPR/dCas9 system

Benjamin Garcia-Bloj, Colette Moses, Agustin Sgro, Janice Plani-Lam, Mahira Arooj, Ciara Duffy, S. Thiruvengadam, Anabel Sorolla , Rabab Rashwan, R.L. Mancera, A. Leisewitz, T. Swift-Scanlan, A.H. Corvalan, Pilar Blancafort

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


The aberrant epigenetic silencing of tumor suppressor genes (TSGs) plays a major role during carcinogenesis and regaining these dormant functions by engineering of sequence-specific epigenome editing tools offers a unique opportunity for targeted therapies. However, effectively normalizing the expression and regaining tumor suppressive functions of silenced TSGs by artificial transcription factors (ATFs) still remains a major challenge. Herein we describe novel combinatorial strategies for the potent reactivation of two class II TSGs, MASPIN and REPRIMO, in cell lines with varying epigenetic states, using the CRISPR/dCas9 associated system linked to a panel of effector domains (VP64, p300, VPR and SAM complex), as well as with protein-based ATFs, Zinc Fingers and TALEs. We found that co-delivery of multiple effector domains using a combination of CRISPR/dCas9 and TALEs or SAM complex maximized activation in highly methylated promoters. In particular, CRISPR/dCas9 VPR with SAM upregulated MASPIN mRNA (22,145-fold change) in H157 lung cancer cells, with accompanying re-expression of MASPIN protein, which led to a concomitant inhibition of cell proliferation and induction of apoptotic cell death. Consistently, CRISPR/dCas9 VP64 with SAM upregulated REPRIMO (680-fold change), which led to phenotypic reprogramming in AGS gastric cancer cells. Altogether, our results outlined novel sequence-specific, combinatorial epigenome editing approaches to reactivate highly methylated TSGs as a promising therapy for cancer and other diseases.
Original languageEnglish
Pages (from-to)60535-60554
Number of pages20
Issue number37
Early online date9 Aug 2016
Publication statusPublished - Sept 2016


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