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Cas9 Mediated Genome Editing - DOAJ

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Last Updated: 26 July 2022

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CRISPR/Cas9-mediated genome editing directed by a 5S rRNA–tRNAGly hybrid promoter in the thermophilic filamentous fungus Humicola insolens

This system is superior to the HDV system in genome editing, allowing highly effective single gene deletion in H. insolens with rates of deletion rates of up to 84 percent. Moreover, when xyr1 was deleted, the extracellular protein content and cellulase activity significantly decreased, indicating for the first time that Xyr1 plays a significant role in cellulase expression control. Conclusions The established CRISPR/Cas9 system, which will enable H. insolens' research into the cellulase gene expression and engineering of H. insolens is expected to begin.

Source link: https://doi.org/10.1186/s13068-021-02057-y


CRISPR/Cas9–Mediated Genome Editing for Pseudomonas fulva , a Novel Pseudomonas Species with Clinical, Animal, and Plant–Associated Isolates

Pseudomonas bacteria, one of the most common species of Gram-negative bacteria, are present in virtually all natural habitats, where they have developed close ties with plants and animals. Pseudomonas fulva is a new species of Pseudomonas with clinical, animal, and plant-u2013associated isolates, closely related to human and animal health, plant growth, and bioremediation. A native P. fulva strain isolated from the model organism's gut was created here, using the CRISPR-u2013Cas system. oqxB, an antigenetic gene that was related to an antibiotic, was knocked out, resulting in the slow growth of the P. fulva deletion mutant in LB containing chloramphenicol. The fluorescence of Fusion constructs with knocked-u2013in gfp revealed strong fluorescence. Pseudomonas species's functionality was revealed by the successful construction and use of new genetic editing techniques. Altogether, the success of new genetic editing techniques gave us more powerful tools to investigate the novel Pseudomonas species's behavior.

Source link: https://doi.org/10.3390/ijms23105443


WheatCRISPR: a web-based guide RNA design tool for CRISPR/Cas9-mediated genome editing in wheat

The failure of widespread bioinformatics technologies to enable the creation of highly specific functional guide RNAs and prediction of off-target wheat sites is the biggest obstacle to successful application of CRISPR technologies to wheat improvement. Individual gRNAs targeting specific loci in the wheat genome were used to determine on-target specificity and potential off-target activity for individual gRNAs targeting specific loci in the wheat genome. To build a gRNA database that would be used as a data source for WheatCRISPR's web application, the genome-wide gRNA mappings and the associated Doench scores predictive of the on-target and off-target activities were used. Conclusions The WheatCRISPR system enables researchers to view all available gRNAs targeting a gene or sequence of interest and select gRNAs based on their predicted high on-target and low off-target activity scores, as well as other parameters such as location within the targeted gene.

Source link: https://doi.org/10.1186/s12870-019-2097-z


CRISPR/Cas9-mediated genome editing assists protein dynamics studies in live cells

Hence, investigating molecular dynamics is critical to knowing how cells decide what to do and the physiological causes of disease. We here discuss the importance of studying fluorescent fusion proteins expressed in living cells, with CRISPR/Cas9-mediated genome editing as the most effective method to do so.

Source link: https://doi.org/10.1016/j.ejcb.2022.151203


CRISPR/Cas9-mediated genome editing reveals 12 testis-enriched genes dispensable for male fertility in mice

In vivo, an analyzing gene function using knockout mice is a common way to determine whether the gene of concern is required for sperm formation, function, and male fertility. We developed KO mice for 12 testis-enriched genes in this study, including 1700057G04Rik, 4930558Rik, 4921539E11Rik, C41258C23Rik, Ldhal6b, Rasef, Slc25a2, Slc25a42, Smim8, Smim9, Tmem210, and Tomm20l using the clustered short palindromic repeats These 12 genes are not necessary for male reproduction, at least when individually ablated, but not together with other potentially compensatory logous genes, according to Mating studies of KO mice.

Source link: https://doi.org/10.4103/aja.aja_63_21


CRISPR-Cas9-Mediated Genome Editing Increases Lifespan and Improves Motor Deficits in a Huntington’s Disease Mouse Model

A versatile device for inducing DNA double-strand breaks that can promote frameshift-inducing mutations and permanently disable mutant gene function. The RNA-guided Cas9 endonuclease from CRISPR-Case is a versatile method for inducing DNA double-strand breaks that can facilitate the introduction of frameshift-inducing mutations and permanently block mutant gene function. Following its in vitro delivery to the striatum, we show that the Cas9 nuclease from Staphylococcus autus, a small Cas9 ortholog that can be delivered alongside a single guide RNA, can be used to alter the expression of the mutant HTT gene in the R6/2 mouse model of HD.

Source link: https://doi.org/10.1016/j.omtn.2019.07.009


Heterologous and endogenous U6 snRNA promoters enable CRISPR/Cas9 mediated genome editing in Aspergillus niger

Abstract Background In the clustered regularly interspaced short palindromic repeats/CRISPR-associated protein genome editing system, U6 promoters have been used for single guide RNA transcription. For sgRNA synthesis, two CRISPR/Cas9 systems in A. n. . . . have recourse to the RNA polymerase II promoter or in vitro transcription, but these techniques generally raise cloning attempts and genetic manipulation. A. n. . . . 's urgent requirement is therefore the validation of functional RNA polymerase II promoters. Here, we created a novel CRISPR/Cas9 system in A. n. . . . for sgRNA expression based on one endogenous U6 promoter and two heterologous U6 promoters. In A. n. . . . , the three tested U6 promoters enabled transcription of sgRNA transcription and the deletion of the polyketide synthase albA gene. Conclusions In A. n. . . . , this review found that both heterologous and endogenous U6 promoters were capable of sgRNA expression.

Source link: https://doi.org/10.1186/s40694-018-0047-4


CRISPR/Cas9-mediated genome editing induces gene knockdown by altering the pre-mRNA splicing in mice

Abstract Background The Short Palindromic Repeats/CRISPR/CRISPR-associated protein 9 has been widely used to produce gene knockout models by inducing indels that result in frame shift. Mice mouse mice demonstrated that gene knockdown models could also be generated using CRISPR-mediated gene editing by breaking the boundary between exon and intron. CRISPR-induced indel at the boundary of exon and intron caused alternative splicing and production of many different mRNAs, but the majority of these mRNAs were delayed gene expression, leading to premature termination codon downexpression.

Source link: https://doi.org/10.1186/s12896-018-0472-8


CRISPR/Cas9-Mediated Genome Editing Corrects Dystrophin Mutation in Skeletal Muscle Stem Cells in a Mouse Model of Muscle Dystrophy

Muscle stem cells have a high therapeutic promise for muscle disorders such as Duchenne muscular dystrophy. In this research, we used a fibrin-gel culture system to selectively grow MuSCs from crude skeletal muscle cells of mdx mice, a mouse model of DMD. We corrected the dystrophin mutation in expanded MuSCs and restored the skeletal muscle dystrophin expression on transplantation in mdx mice by CRISP/Cas9-based genome editing.

Source link: https://doi.org/10.1016/j.omtn.2017.02.007


Evaluating the Efficiency of gRNAs in CRISPR/Cas9 Mediated Genome Editing in Poplars

CRISPR/Cas9 has become one of the most popular genome editing techniques in plants, and it has performed well in poplars with an Agrobacterium-mediated transformation system. The gRNAs were intended for editing and migrated either into the poplar hybrid Populus tremula or into P. tremula. According, a constituent Cas9 expression does not appear to pose any threat to further editing activities. We found evidence confirming a correlation between the gRNA structure and gene editing's success based on various criteria. In particular, the GC content, purine residues in the gRNA end, and free access to the seed region for genome editing in poplars seemed to be highly relevant for genome editing. Afford gRNAs can be developed for future editing applications in poplars based on our findings on nine species of poplar genes.

Source link: https://doi.org/10.3390/ijms20153623

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions