Браузер не даёт сохранять данные (например, приватный режим): закладки пропадут после закрытия вкладки.
Поиск статей PubMed
Ключевые слова, автор, журнал, годы — результаты из PubMed, аннотации с переводом на русский, закладки в браузере.
Найдено: 26 190
Страница 558 из 1000-
The Versatile Type V CRISPR Effectors and Their Application Prospects.
The class II clustered regularly interspaced short palindromic repeats (CRISPR)-Cas systems, characterized by a single effector protein, can be further subdivided into types II, V, and VI. The application of the type II CRISPR effector protein Cas9 as a sequence-specific nuclease in gene editing has revolutionized this field. Similarly, Cas13 as the effector protein of type VI provides a convenient tool for RNA manipulation. Additionally, the type V CRISPR-Cas system is another valuable resource with many subtypes and diverse functions. In this review, we summarize all the subtypes of the type V family that have been identified so far. According to the functions currently displayed by the type V family, we attempt to introduce the functional principle, current application status, and development prospects in biotechnology for all major members.
-
Plant genome editing using xCas9 with expanded PAM compatibility.
-
CRISPR-Based Functional Genomics in Pluripotent Stem Cells.
The integration of CRISPR-based functional genomics with pluripotent stem cell (PSC) technologies has been recognized as a transformative approach for investigating gene function, modeling human disease, and advancing regenerative medicine. The aim of this review is to provide a comprehensive evaluation of recent developments in CRISPR-Cas platforms, including gene knockouts, base and prime editing, and CRISPR activation or interference (CRISPRa/i), as applied to PSC systems. Studies employing human PSCs, including embryonic stem cells and induced pluripotent stem cells, have been examined to summarize methodologies for genome-wide screening, lineage tracing, and therapeutic engineering. Advances in editing efficiency, delivery strategies, and genomic safety have been reported, while limitations persist in the form of off-target modifications, epigenetic variability, and cell-type-specific responses. Notable applications include the generation of immune-evasive PSC lines, the development of organoid models for physiological and pathological studies, and the implementation of phenotypic screening for disease-relevant traits. Collectively, these technological and methodological advancements have established functional genomics of PSC-CRISPRSPR as a versatile and powerful framework for elucidating fundamental aspects of human biology, dissecting complex traits, and accelerating the translation of discoveries from experimental research to clinical implementation.
-
Advanced gene editing technologies for oncology mechanisms, applications, and clinical implementation.
Advanced gene editing tools have transformed oncology by facilitating precise molecular therapies aimed at the hereditary basis of cancer. This thorough study examines the mechanisms, applications, and clinical implementation of advanced genome editing technologies in cancer treatment. This review commences with the molecular principles of genome editing and DNA repair mechanisms, systematically analyzing established technologies such as Zinc Finger Nucleases, Transcription Activator-Like Effector Nucleases, and various CRISPR/Cas systems (Cas9, Cas12, Cas13), in addition to novel advancements including base editors, prime editors, and the PASTE system. Additionally, hybrid platforms such as ARCUS, MegaTALs, and modified recombinases are examined, highlighting their amalgamation with artificial intelligence, biosensors, and synthetic biology concepts. The study outlines significant applications including functional genomics, disease modeling, synthetic lethality screening, and direct therapeutic interventions, with a specific focus on CAR-T cell engineering and immune checkpoint regulation. Applications unique to various cancer types are thoroughly examined throughout lung, breast, colorectal, hematologic, liver, pancreatic, head & neck, esophageal, prostate, gastric, and brain cancers. Significant obstacles such as delivery optimization via viral and non-viral vectors, tumor-specific targeting, off-target effects, immunogenicity, and ethical issues related to germline vs somatic editing are comprehensively examined. The translational landscape is analyzed via current clinical trials, regulatory structures, and the incorporation of organoid models and patient-derived xenografts for the advancement of personalized therapies. This review highlights the transformative impact of gene editing on cancer medicine, advancing toward more accurate, effective, and personalized therapeutic approaches.
-
All types of base conversions allowed by base editors.
-
CRISPR-Cas9-AID base editor is a powerful gain-of-function screening tool.
-
Predictable and precise template-free CRISPR editing of pathogenic variants.
Following Cas9 cleavage, DNA repair without a donor template is generally considered stochastic, heterogeneous and impractical beyond gene disruption. Here, we show that template-free Cas9 editing is predictable and capable of precise repair to a predicted genotype, enabling correction of disease-associated mutations in humans. We constructed a library of 2,000 Cas9 guide RNAs paired with DNA target sites and trained inDelphi, a machine learning model that predicts genotypes and frequencies of 1- to 60-base-pair deletions and 1-base-pair insertions with high accuracy (r = 0.87) in five human and mouse cell lines. inDelphi predicts that 5-11% of Cas9 guide RNAs targeting the human genome are 'precise-50', yielding a single genotype comprising greater than or equal to 50% of all major editing products. We experimentally confirmed precise-50 insertions and deletions in 195 human disease-relevant alleles, including correction in primary patient-derived fibroblasts of pathogenic alleles to wild-type genotype for Hermansky-Pudlak syndrome and Menkes disease. This study establishes an approach for precise, template-free genome editing.
-
Accelerated discovery and miniaturization of novel single-stranded cytidine deaminases.
Cytidine base editors (CBEs) hold significant potential in genetic disease treatment and in breeding superior traits into animals. However, their large protein sizes limit their delivery by adeno-associated virus (AAV), given its packing capacity of <4.7 kb. To overcome this, we employed a web-based fast generic discovery (WFG) strategy, identifying several small ssDNA deaminases (Sdds) and constructing multiple Sdd-CBE 1.0 versions. SflSdd-CBE 1.0 demonstrated high C-to-T editing efficiency, comparable to AncBE4max, while SviSdd-CBE 1.0 exhibited moderate C-to-T editing efficiency with a narrow editing window (C3 to C5). Utilizing AlphaFold2, we devised a one-step miniaturization strategy, reducing the size of Sdds while preserving their efficiency. Notably, we administered AAV8 expressing PCSK9 targeted sgRNA and SflSdd-CBEs (nSaCas9) 2.0 into mice, leading to gene-editing events (with editing efficiency up to 15%) and reduced serum cholesterol levels, underscoring the potential of Sdds in gene therapy. These findings offer new single-stranded editing tools for the treatment of rare genetic diseases.
-
PhieDBEs: a DBD-containing, PAM-flexible, high-efficiency dual base editor toolbox with wide targeting scope for use in plants.
Dual base editors (DBEs) enable simultaneous A-to-G and C-to-T conversions, expanding mutation types. However, low editing efficiency and narrow targeting range limit the widespread use of DBEs in plants. The single-strand DNA binding domain of RAD51 DBD can be fused to base editors to improve their editing efficiency. However, it remains unclear how the DBD affects dual base editing performance in plants. In this study, we generated a series of novel plant DBE-SpGn tools consisting of nine constructs using the high-activity cytidine deaminase evoFERNY, adenosine deaminase TadA8e and DBD in various fusion modes with the PAM-flexible Streptococcus pyogenes Cas9 (SpCas9) nickase variant SpGn (with NG-PAM). By analysing their editing performance on 48 targets in rice, we found that DBE-SpGn constructs containing a single DBD and deaminases located at the N-terminus of SpGn exhibited the highest editing efficiencies. Meanwhile, constructs with deaminases located at the C-terminus and/or multiple DBDs failed to function normally and exhibited inhibited editing activity. We identified three particularly high-efficiency dual base editors (C-A-SpGn, C-A-D-SpGn and A-C-D-SpGn), named PhieDBEs (Plant high-efficiency dual base editors), capable of producing efficient dual base conversions within a narrow editing window (M5 ~ M9, M = A/C). The editing efficiency of C-A-D-SpGn was as high as 95.2% at certain target sites, with frequencies of simultaneous C-to-T and A-to-G conversions as high as 81.0%. In summary, PhieDBEs (especially C-A-D-SpGn) can produce diverse mutants and may prove useful in a wide variety of applications, including plant functional genomics, precise mutagenesis, directed evolution and crop genetic improvement, among others.
-
Genome editing in maize directed by CRISPR-Cas9 ribonucleoprotein complexes.
Targeted DNA double-strand breaks have been shown to significantly increase the frequency and precision of genome editing. In the past two decades, several double-strand break technologies have been developed. CRISPR-Cas9 has quickly become the technology of choice for genome editing due to its simplicity, efficiency and versatility. Currently, genome editing in plants primarily relies on delivering double-strand break reagents in the form of DNA vectors. Here we report biolistic delivery of pre-assembled Cas9-gRNA ribonucleoproteins into maize embryo cells and regeneration of plants with both mutated and edited alleles. Using this method of delivery, we also demonstrate DNA- and selectable marker-free gene mutagenesis in maize and recovery of plants with mutated alleles at high frequencies. These results open new opportunities to accelerate breeding practices in a wide variety of crop species.
PubMed отдаёт не больше 10 000 первых результатов — уточните запрос, чтобы увидеть остальные.