Cited by 165CRISPR and Genetic EngineeringMarine Invertebrate Physiology and EcologyAnimal Genetics and Reproduction

TALEN and CRISPR/Cas9-mediated genome editing in the early-branching metazoan Nematostella vectensis

Open access
Ikmi, Aissam, McKinney, Sean A., Delventhal, Kym M., Gibson, Matthew C.·2014·Nature Communications

Abstract

Non-bilaterian phyla represent key lineages for exploring the evolutionary history of early animals. However, despite an increasing number of sequenced genomes from early-branching metazoans, efficient and reproducible methodologies for analysis of gene function remain a major challenge. Here we report the utilization of the TALEN and CRISPR/Cas9 systems to induce targeted mutations and homologous recombination-mediated transgenesis in the sea anemone Nematostella vectensis. We also present a new method to isolate genetically modified animals using engineered selection cassettes introduced by homologous recombination. Taken together, these methods will permit sophisticated gain- and loss-of-function analyses in Nematostella and perhaps other early metazoan species that allow for zygotic injection.

Integrity signals

Registry

Crossref · 10.1038/ncomms6486

Cites

41 of 41 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 9 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    Mutagenesis at the expected NvFP-7R site was confirmed in each of three mosaic 12-tentacle polyps analysed.

    “We confirmed mutagenesis of the expected site in NvFP-7R in each of three mosaic 12-tentacle polyps analysed (Fig. 4c).”
    Quote in the paperSubstantial claim
  • Findingown data

    Five candidate Nematostella HSP70 coding genes were found by BLAST search of the Nematostella genome using zebrafish HSP70 as the query.

    “We identified five potential Nematostella HSP70 coding genes using a BLAST search against the Nematostella genome (Joint Genome Institute) and zebrafish HSP70 as a query.”
    Quote in the paperSubstantial claim
  • Findingown data

    After CRISPR/Cas9-mediated homologous recombination, NvFP-7R::eGFP was expressed at ectopic positions around the oral pole.

    “Intriguingly, NvFP-7R::eGFP expression was once again detected at ectopic positions around the oral pole (Fig. 4d), similar to the effect we observed following TALEN-mediated homologous recombination at a different position in exon 2 (Supplementary Fig. 5).”
    Quote in the paperSubstantial claim
  • Findingown data

    Polyp #1 showed substitution of NvFP-7R by NvFP-7R::eGFP in one domain.

    “Polyp #1 displays a substitution of NvFP-7R by NvFP-7R::eGFP in one domain, while polyp #2 shows two domains of NvFP-7R::eGFP expression (white arrowheads).”
    Quote in the paperNot a substantial claim
  • Findingown data

    NvFP-7R is not needed for normal development or homeostasis of Nematostella under laboratory conditions.

    “Together, these results suggest that NvFP-7R is not required for normal development or homeostasis of Nematostella under laboratory conditions.”
    Quote in the paperSubstantial claim
  • May combine two claims. 9
  • Classified as probably not a substantial claim. 4
  • May combine two claims.

    Findingown data

    hs-eGFP-injected embryos showed strong eGFP expression after a 30-minute heat shock at 37 °C, but not when kept at room temperature.

    “hs-eGFP-injected embryos show strong expression of eGFP after heat-shock treatment (30 min at 37 °C), but not those incubated at room temperature.Scale bar, 600 mm.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Findingown data

    Polyp #2 showed two domains of NvFP-7R::eGFP expression.

    “Polyp #1 displays a substitution of NvFP-7R by NvFP-7R::eGFP in one domain, while polyp #2 shows two domains of NvFP-7R::eGFP expression (white arrowheads).”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    CRISPR/Cas9-mediated homologous recombination with the NvFP-7R::eGFP-MHC1-mCherry cassette gave mCherry expression in 6.4% of surviving 12-tentacle polyps, and 18.7% of those were also NvFP-7R::eGFP-positive, consistent with correct integration.

    “Here, 6.4% of surviving 12-tentacle polyps displayed the expression of mCherry, and 18.7% of these animals were also NvFP-7R::eGFP-positive, consistent with integration at the correct genomic site (Supplementary Table 2).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    TALEN-induced mutations are transmitted through the germline of injected F0 females; transmission was seen in 50% of red-less F0 females, with mutation frequency up to 80%.

    “In contrast, we documented germline transmission of induced mutations in unfertilized eggs from 50% of red-less F0 females (n ¼ 12; Supplementary Fig. 4a,b), with a frequency of NvFP-7R mutation up to 80% (Supplementary Fig. 4c).”
    • Also stated in: § Germline transmission of TALEN-induced mutations. · boosted
      “These results demonstrate efficient TALEN-induced mutations of the Nematostella germline.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    TALEN-mediated homologous recombination works in both somatic and germline cells and can insert exogenous sequences at target sites in Nematostella.

    “Taken together, these results show that TALENmediated homologous recombination functions in both somatic and germline cells and can be used to introduce exogenous sequences into target sites in the Nematostella genome.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    TALENs produce targeted DNA lesions in the Nematostella genome and often disrupt both alleles in many somatic cells.

    “Collectively, these findings demonstrate that TALENs can efficiently generate targeted lesions in the Nematostella genome, frequently disrupting both alleles in a large number of somatic cells.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    In red-less animals with strong NvFP-7R disruption, the NvFP5 off-target site with two mismatches was mutated in all three analysed animals, while the NvFP4 site with six mismatches was not mutated.

    “Intriguingly, the NvFP5 site containing two mismatches was mutated in all analysed animals (n ¼ 3), but we did not detect any mutations in the NvFP4 site, which includes six mismatches (Supplementary Fig. 1b).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Co-injection of the Nvanthox6 donor vector with gRNA-hox6/Cas9 protein complex gave mCherry-positive polyps in 4.5% of recovered polyps (n=440), and disruption of Nvanthox6 exon 1 by the MHC1-mCherry cassette was molecularly validated in a pool of five F0 primary polyps.

    “Following coinjection of this donor vector with gRNA-hox6/Cas9 protein complex, 4.5% of recovered polyps were mCherry-positive (n ¼ 440), and we molecularly validated the disruption of Nvanthox6 exon 1 by the MHC1-mCherry cassette in a pool of five F0 primary polyps (Supplementary Fig. 7b).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    TALEN-injected animals displayed three NvFP-7R expression phenotypes: normal, mosaic with loss in some domains, and red-less with no detectable expression; the phenotype percentages were based on n=312.

    “TALEN-injected animals exhibit three phenotypes of NvFP-7R expression.The first phenotype appears normal (wild type).The second phenotype (mosaic) displays loss of NvFP-7R expression in one or more domains and normal expression in others (white arrowheads).The third phenotype lacks any detectable expression of NvFP-7R (red-less).The percentages of each phenotype are indicated (n ¼ 312).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Injection of nls-eGFP-2A-Cas9 mRNA into unfertilized eggs produced nuclear eGFP at 4 h post fertilization, with expression rising 30-fold and plateauing around 19 h post fertilization.

    “After injection of the nls-eGPF-2A-Cas9 mRNA (250 ng ml À 1 ) into unfertilized eggs, we detected nuclear eGFP at 4 h post fertilization (h.p.f.) and its expression level increased 30-fold reaching a plateau around 19 h.p.f.(Supplementary Fig. 6b,c; Supplementary Movie 3).”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Interpretationreasoning

    This approach removes concern about position effects and multicopy insertions that can occur with traditional meganuclease-mediated transgenesis.

    “Besides the ease of visual screening, this approach eliminates concern over position effects and multicopy insertions that could occur in the traditional meganuclease-mediated transgenesis method.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    TALEN-mediated homologous recombination has been used to insert exogenous DNA into the genomes of Drosophila, zebrafish and mouse.

    “In a limited number of cases, TALEN-mediated homologous recombination has been used to insert exogenous DNA into the genomes of Drosophila 11 , zebrafish 8 and mouse 18 .”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites [11] Katsuyama, T. et al. An efficient strategy for TALEN-mediated genome engineering in Drosophila. Nucleic Acids Res. 41, e163 (2013). source

      Not checked in the free run.

    • cites [8] Zu, Y. et al. TALEN-mediated precise genome modification by homologous recombination in zebrafish. Nat. Methods. 10, 329–331 (2013). source

      Not checked in the free run.

    • cites [18] Sommer, D. et al. Efficient genome engineering by targeted homologous recombination in mouse embryos using transcription activator-like effector nucleases. Nat. Commun. 5, 3045 (2014). source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

    Interpretationreasoning

    The same experimental approach has the potential to work in any nonbilaterian system with accessible eggs.

    “Following from this proof of principle, the same experimental approach has the potential to succeed in any nonbilaterian system with accessible eggs.”
    Quote in the paperNot a substantial claim
13 of 13
  • The paper relies on this without support.

    Efficient and reproducible methods for studying gene function in early-branching metazoans are still a major challenge.

    “However, despite an increasing number of sequenced genomes from early-branching metazoans, efficient and reproducible methodologies for analysis of gene function remain a major challenge.”
  • The paper relies on this without support.

    In non-bilaterian animals, experimental tools are a limiting factor for functional studies, so available approaches are restricted to partial and imprecise gene disruption.

    “Among the non-bilaterians (Cnidaria, Placozoa, Porifera and Ctenophora), experimental tools remain a limiting factor for functional studies, restricting the available approaches to partial and imprecise gene disruption via morpholinos, RNA interference, pharmacological inhibitor experiments and correlative analyses of gene expression patterns.”
  • The paper relies on this without support.

    Constructing functional TALEN pairs can be difficult and slow.

    “The construction of functional TALEN pairs can be challenging and time-consuming.”
  • The paper relies on this without support.

    Mutations recovered from injected Nematostella were caused by the injected TALENs or CRISPR/Cas9 rather than by spontaneous mutations or other factors.

    “Molecular characterization of NvFP-7R-TALEN-induced mutations recovered from a phenotypically Red-less F0 animal.”
4 of 4

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Genome-editing technologies such as TALENs and CRISPR/Cas9 are now available in some cnidarian model systems.

    “In addition to well-established transient knockdown strategies (dsRNA, morpholinos), genome-editing technologies like TALENs or CRISPR/Cas9 are now available in some cnidarian model systems [105,106].”

    From Back to the Basics: Cnidarians Start to Fire (2017) · cites this paper as [105]

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Ikmi, A., McKinney, S. A., Delventhal, K. M., & Gibson, M. C.
Affiliations
Stowers Institute for Medical Research (US)
Corresponding author
Gibson, Matthew C.
Venue
Nature Communications
Published
2014-11-24
Volume
5
Issue
1
Pages
5486-5486
ISSN
2041-1723 (ISSN-L)
OpenAlex
W2121260094
Cited by
165
References
41
Citations by year
2026: 7 · 2025: 11 · 2024: 21 · 2023: 12 · 2022: 26 · 2021: 12 · 2020: 12 · 2019: 12 · 2018: 14 · 2017: 11 · 2016: 15 · 2015: 10 · 2014: 1
FWCI
5.05
Type
journal article
Language
en
Open access
Locations
  • Nature Communications (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
Stowers Institute for Medical Research
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Marine Invertebrate Physiology and Ecology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Animal Genetics and Reproduction
Keywords
Nematostella vectensis, TALEN, CRISPR/Cas9, genome editing, gene function analysis, sea anemone
MeSH terms
Animals, Base Sequence, Deoxyribonucleases, Endonucleases, Molecular Sequence Data, Sea Anemones, Mutagenesis, Genome, Homologous Recombination, Clustered Regularly Interspaced Short Palindromic Repeats

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-06.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-06.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review