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Method Article

Efficient Generation of hiPSC Neural Lineage Specific Knockin Reporters Using the CRISPR/Cas9 and Cas9 Double Nickase System

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DOI:

10.3791/52539

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May 28th, 2015

* These authors contributed equally

In This Article

Summary

Genome editing tools such as the CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats)/Cas (CRISPR-associated) system have greatly improved gene targeting efficiency in human induced pluripotent stem cells (hiPSCs). This manuscript describes a protocol for generating lineage specific hiPSC reporter using CRISPR/Cas system assisted homologous recombination.

Abstract

Gene targeting is a critical approach for characterizing gene functions in modern biomedical research. However, the efficiency of gene targeting in human cells has been low, which prevents the generation of human cell lines at a desired rate. The past two years have witnessed a rapid progression on improving efficiency of genetic manipulation by genome editing tools such as the CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats)/Cas (CRISPR-associated) system. This manuscript describes a protocol for generating lineage specific human induced pluripotent stem cell (hiPSC) reporters using CRISPR/Cas system assisted homologous recombination. Procedures for obtaining necessary components for making neural lineage reporter lines using the CRISPR/Cas system, focusing on construction of targeting vectors and single guide RNAs, are described. This protocol can be extended to platform establishment and mutation correction in hiPSCs.

Introduction

CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats)/Cas (CRISPR-associated) system, together with other genome editing tools, has revolutionized the human genome manipulation in recent years1-7. Major components in the CRISPR/Cas9 system are single guide RNA (sgRNA) and Cas9. Cas9 is an RNA-guided type II DNA endonuclease. It has two nuclease domains, HNH and RuvC, which are responsible for making DNA double-stranded breaks (DSBs) at a specific genomic region next to a protospacer adjacent motif (PAM)7-10.An sgRNA has a combined function of that of crRNA and tracrRNA, two adaptive immunity RNA molecules identified in bacteria (such as Streptococcus....

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Protocol

1. Design and Vector Construction for Targeting Vectors

  1. Once the lineage specific marker is determined, locate the genomic sequence of the gene and design the homology arms accordingly. The length of 5’ homology arm is ~1 kb and of 3’ homology arm is ~1.5 kb (Figure 1).
  2. Tag the reporter cassette sequentially downstream of the genomic sequence right before the stop codon, by subcloning, so that the endogenous expression is not altered or disrupted. Link the reporter, or dual reporter cassette(s), with self-cleaving 2A peptide sequences (F2A, E2A or T2A) 20,21, or internal ribosome entry site (IRES).
    N....

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Results

Targeting vectors with all necessary components including homology arms, reporter cassette, positive and negative selection cassettes are constructed (Figure 1). Based on the endogenous genomic locus, multiple (2 to 3) sgRNAs (if using the Cas9 system) or sgRNA pairs (if using the Cas9n double nickase strategy) are designed and constructed into human-gRNA-expression vector MLM3636 or pX335-U6-Chimeric_BB-CBh-hSpCas9n (D10A) backbones (Figure 2). Before transfecting hiPSCs, the sgRNAs are.......

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Discussion

Gene targeting is an essential tool in characterizing gene functions. However, the relatively low efficiency demands labor-intensive and time-consuming work. Recently development on genome editing tools such as the CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats)/Cas (CRISPR-associated) system has greatly improved the targeting efficiency. This manuscript describes a protocol for generating lineage specific human induced pluripotent stem cell (hiPSC) reporter using CRISPR/Cas system assisted homologous recombination. Steps .......

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Disclosures

The authors have nothing to disclose.

Acknowledgements

This work was supported by the Department of Neurosurgery, Memorial Hermann Foundation Staman Ogilvie Fund, the Bentsen Stroke Center at the University of Texas Health Science Center at Houston, and Mission Connect TIRR Foundation.

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Materials

List of materials used in this article
NameCompanyCatalog NumberComments
pStart-KAddgene20346
pWS-TK6 Addgene20350
pKD3 Addgene45604
pKD46The Coli Genetic Stock Center, CGSC7634
PGK-neo-bpA sequence Addgene13442
Human BAC clones of target genes https://bacpac.chori.org
JDS246 (Cas9-003), Mammalian codon-optimized streptococcus pyogenes Cas9-3X FlagAddgene43861
MLM3636, Human-gRNA-ExpressionVector with U6 promoter Addgene43860
pX335-U6-Chimeric_BB-CBh-hSpCas9n(D10A)Addgene42335
sgRNA design, ZiFithttp://zifit.partners.org/ZiFiT/
Off target prediction tool CasOThttp://eendb.zfgenetics.org/casot/download.php
Perlhttp://www.perl.org/get.html
NCBIhttp://www.ncbi.nlm.nih.gov/
BLAThttps://genome.ucsc.edu/cgi-bin/hgBlat?command=start
sgRNA Primer synthesisSigma
One shot Top10 Electrocomp E. Coli Competent cellsLife TechnologiesC4040-50
AccuPrime Pfx SupperMixLife Technologies12344-040
Restriction enzymesNEB and Life Technologies
Zymoclean Gel DNA Recovery KitZymo ResearechD4007
DNA quick extraction buffer EpicentreQE0905T
Herculase II Fusion DNA PolymerasesAgilent Technologies600675
Digestion buffer 2New England Biolab
6X DNA Loading DyeThermo ScientificR0611
TeSR-E8 Kit for hESC/hiPSC MaintenanceStem Cell Technologies05940
UltraPure Agarose Life Technologies16500-100
50xTAELife TechnologiesB49
Essential 8 medium Life TechnologiesA1517001
Dulbecco’s Phosphate Buffered Saline without Calcium and Magnesium Life TechnologiesA12856-01
D-MEM/F12 with Glutamax Life Technologies10565018
D-MEM with Glutamax Life Technologies10566040
Fetal Bovine Serum-ES cell qualified Life Technologies10439
Knockout serum replacement Life Technologies10828010
2-mercaptoethanol 1000X Life Technologies21985023
Non Essential Amino Acid Life Technologies11140050
Stempro Accutase Life TechnologiesA1110501
Dispase Life Technologies17105-041
0.25% Trypsin- EDTA solution Life Technologies25200-056
Geltrex Life Technologies   12760-013
ROCK inhibitor Y-27632Millipore   SCM075
SMC4 reagent BD354357
Neomycin resistant MEF MilliporePMEF-NL
Hygromycin resistant MEF MilliporePMEF-HL
G418 (Geneticin)LifeTechnologies11811
Hygromycin B Life Technologies10687010
FIAU (Fialuridine, 1-2-Deoxy-2-fluoro-ß-D-arabinofuranosyl-5-iodouracil Moravek Biochemicals and Radiochemicals   M251
Electroporator: Gene Pulser Xcell Bio-Rad
0.4 cm electroporation cuvette Bio-Rad165-2088
DIG-High prime DNA labeling and detection starter kit II Roche11585614910
Hybridization denature solution VWR82021-478
PCR DIG probe synthesis kit Roche11636090910
DIG wash set Roche11585762001
Anti-Digoxigenin (DIG-AP)Roche11093274910
CSPD chemiluminescence system Roche11755633001
DIG wash and block buffer set Roche11585762001
50X TAE buffer Life Technologies24710030
Blotting buffer (25 mM Tris pH 7.4,  0.15 M NaCl,  0.1% Tween20)
Hoefer Ultraviolet Crosslinker Fisher Scientific03-500-308
Spermidine FisherAC13274-0010
Tris HCl 2M (pH 7.5)VWR   200064-506
Denville Scientific blue bio film 8x10 Fishernc9550782
DNA molecular weight marker II ( DIG-labeled )Roche11218590910
Amersham Blotting membrane Hybond-N+ Roche95038-400
Pyrex glass drying tray Fisher15-242A
Kimberly-Clark C-fold paper towels Fisher06-666-32B
Whatman 3MM paper (26X41)Fisher   05-713-336
Hybridization bag Roche11666649001
Hybridization tubes Fisher13-247-300
Hybridization oven rotisserie Shake 'n' Stack FisherHBMSOV14110

References

  1. Wang, H., et al. One-step generation of mice carrying mutations in multiple genes by CRISPR/Cas-mediated genome engineering. Cell. 153, 910-918 (2013).
  2. Mali, P., et al. RNA-guided human genome engineering via Cas9. Science. 339, 8....

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Tags

Knockin Reporter GenerationTargeting Vector ConstructionSingle Guide RNA DesignT7 Endonuclease AssayOff-Target Site PredictionHomologous RecombinationPlasmid Preparation