ATUM's unique single nickase vector co-expresses two gRNAs using dual promoters,
thus removing the need for co-transfection. Vectors are available with a fluorescent
reporter for easy identification of transfected cells.
Use two tandem gRNAs with a NickaseNinja vector with Cas9N nickase mutant to enhance specificity.
gRNA design tool to design gRNAs to target your specific locus. ATUM will clone your gRNAs
into the CRISPR construct of your choice and send you ready-to-transfect plasmid.
Overview - CRISPR Vectors
ATUM’s CRISPR vectors comprise a gene encoding the Cas9 nuclease, and a cassette for expressing the guide RNA
which targets the nuclease.
Cas9 nucleases are directed by a 20nt guide sequence to cleave almost any genomic locus. The resulting chromosomal
break will normally be repaired via non-homologous end joining (NHEJ) producing small deletions or insertions at
the targeted locus. Alternatively, by transfecting a homologous donor DNA with the Cas9, you can stimulate the
homology-directed DNA repair system to replace the target sequence with a desired alteration.
Cas9 has two catalytic domains, the RuvC-like nuclease domain that cleaves the noncomplementary strand and the HNH
nuclease domain that cleaves the complementary strand of DNA. Our Cas9N or nickase is a D10A point mutation in the
RuvC-like nuclease domain of Cas9 nuclease.
The guide RNA directs Cas9 to the genomic target via Watson-Crick base pairing and can be easily programmed to
target any genomic locus. ATUM’s gRNA design tool designs gRNAs with maximal specificity by minimizing sequence
identity with other genomic loci outside your target.
ATUM’s mammalian CRISPR vectors offer the following feature choices:
Promoter Choice: CMV, CBh or CAG*
gRNA sequences were Electra cloned into pD1301, pD1311, and pD1321. HEK293 cells were transfected using 0.5µg of
plasmid. 72 hours post transfection, genomic DNA was isolated and sequenced. ATUM vectors displayed varying indel
frequencies depending upon promoter sequence. Indel frequency and promoter behaviour will vary in different cell
The CRISPR vectors were validated by targeting the EMX-1 gene in HEK293 cells. The gRNA sequences were Electra cloned
into the pD13xx vectors and transfected into HEK293 cells. Post-transfection, genomic DNA was isolated and sequenced
at the appropriate locus. ATUM vectors displayed insertion and deletion (indel) frequencies which varied depending upon
promoter sequence and displayed indel frequencies comparable to published data targeting the same locus.
DS or SS Breaks:
Cas9 (S. pyogenes) causes double-strand breaks
Cas9N nickase mutant causes single strand breaks (use 2 tandem gRNAs with NickaseNinja vector to further enhance specificity)
ATUM’s unique single nickase vector co-expresses two gRNAs using dual U6 promoters, thus removing the need for
co-transfection. The NickaseNinja vector can also include a fluorescent reporter protein for easy identification
of transfected cells.
NickaseNinja constructs with dual gRNAs require the ATUM
Custom Construct Service. Using this service, any ATUM
nickase vector can be modified by ATUM to a NickaseNinja All-in-One construct expressing your specific
Choice of fluorescent reporters to monitor Cas9 expression, or linked puromycin resistance
Comparison of the ATUM All-in-One NickaseNinja™ vector (using tandem gRNAs and dual U6 promoters) with the
conventional 2-Vector system. gRNA sequences are as follows:
Let ATUM do the work for you. Simply, use our tool to design gRNAs to target your specific locus. ATUM will
clone your gRNAs into the CRISPR construct of your choice and send you Ready-to-transfect plasmid. NickaseNinja
vectors with 2 tandem gRNAs and increased transfection efficiency are only available with this service.
Design your gRNA(s)
Select your vector
Cost:$300 (single gRNA vector), $600 (double gRNA NickaseNinja vector) for standard transfection
ready prep (2-5 µg plasmid DNA). Endotoxin free midi preps (~100 µg plasmid DNA) are available for an
CRISPR Catalog Vectors (Ready to Clone):
Select and order your vectors from the list below. Use our tool to design your gRNA, prepare and
Electra-clone it yourself.