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Nucleic Acids Res. 2017 Feb 17;45(3):e12. doi: 10.1093/nar/gkw883.

Challenges of CRISPR/Cas9 applications for long non-coding RNA genes.

Goyal A1,2, Myacheva K1,3,4,5,6,7, Groß M1,2, Klingenberg M1,2,8, Duran Arqué B1, Diederichs S1,2,3,4,5,6,8.

Author information

1
Division of RNA Biology & Cancer, German Cancer Research Center (DKFZ), Heidelberg, Germany.
2
Institute of Pathology, University Hospital Heidelberg, Heidelberg, Germany.
3
Division of Cancer Research, Dept. of Thoracic Surgery, Medical Center - University of Freiburg, Freiburg, Germany.
4
Faculty of Medicine, University of Freiburg, Freiburg, Germany.
5
Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, Freiburg, Germany.
6
German Cancer Consortium (DKTK), Freiburg, Germany.
7
Faculty of Biology, University of Freiburg, Freiburg, Germany.
8
Hartmut Hoffmann-Berling International Graduate School of Molecular and Cellular Biology (HBIGS), University of Heidelberg, Heidelberg, Germany.

Abstract

The CRISPR/Cas9 system provides a revolutionary genome editing tool for all areas of molecular biology. In long non-coding RNA (lncRNA) research, the Cas9 nuclease can delete lncRNA genes or introduce RNA-destabilizing elements into their locus. The nuclease-deficient dCas9 mutant retains its RNA-dependent DNA-binding activity and can modulate gene expression when fused to transcriptional repressor or activator domains. Here, we systematically analyze whether CRISPR approaches are suitable to target lncRNAs. Many lncRNAs are derived from bidirectional promoters or overlap with promoters or bodies of sense or antisense genes. In a genome-wide analysis, we find only 38% of 15929 lncRNA loci are safely amenable to CRISPR applications while almost two-thirds of lncRNA loci are at risk to inadvertently deregulate neighboring genes. CRISPR- but not siPOOL or Antisense Oligo (ASO)-mediated targeting of lncRNAs NOP14-AS1, LOC389641, MNX1-AS1 or HOTAIR also affects their respective neighboring genes. Frequently overlooked, the same restrictions may apply to mRNAs. For example, the tumor suppressor TP53 and its head-to-head neighbor WRAP53 are jointly affected by the same sgRNAs but not siPOOLs. Hence, despite the advantages of CRISPR/Cas9 to modulate expression bidirectionally and in cis, approaches based on ASOs or siPOOLs may be the better choice to target specifically the transcript from complex loci.

PMID:
28180319
PMCID:
PMC5388423
DOI:
10.1093/nar/gkw883
[Indexed for MEDLINE]
Free PMC Article

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