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RSS Most recent PubMed articles (full bibliography available above)

  • Joint genotypic and phenotypic outcome modeling improves base editing variant effect quantification September 21, 2023
    CRISPR base editing screens are powerful tools for studying disease-associated variants at scale. However, the efficiency and precision of base editing perturbations vary, confounding the assessment of variant-induced phenotypic effects. Here, we provide an integrated pipeline that improves the estimation of variant impact in base editing screens. We perform high-throughput ABE8e-SpRY base editing screens with […]
    Jayoung Ryu
  • Systematic elucidation of genetic mechanisms underlying cholesterol uptake May 25, 2023
    Genetic variation contributes greatly to LDL cholesterol (LDL-C) levels and coronary artery disease risk. By combining analysis of rare coding variants from the UK Biobank and genome-scale CRISPR-Cas9 knockout and activation screening, we substantially improve the identification of genes whose disruption alters serum LDL-C levels. We identify 21 genes in which rare coding variants significantly […]
    Marisa C Hamilton
  • A molecular glue approach to control the half-life of CRISPR-based technologies March 22, 2023
    Cas9 is a programmable nuclease that has furnished transformative technologies, including base editors and transcription modulators (e.g., CRISPRi/a), but several applications of these technologies, including therapeutics, mandatorily require precision control of their half-life. For example, such control can help avert any potential immunological and adverse events in clinical trials. Current genome editing technologies to control […]
    Vedagopuram Sreekanth
  • Systematic elucidation of genetic mechanisms underlying cholesterol uptake January 30, 2023
    Genetic variation contributes greatly to LDL cholesterol (LDL-C) levels and coronary artery disease risk. By combining analysis of rare coding variants from the UK Biobank and genome-scale CRISPR-Cas9 knockout and activation screening, we have substantially improved the identification of genes whose disruption alters serum LDL-C levels. We identify 21 genes in which rare coding variants […]
    Marisa C Hamilton
  • Peptide fusion improves prime editing efficiency June 18, 2022
    Prime editing enables search-and-replace genome editing but is limited by low editing efficiency. We present a high-throughput approach, the Peptide Self-Editing sequencing assay (PepSEq), to measure how fusion of 12,000 85-amino acid peptides influences prime editing efficiency. We show that peptide fusion can enhance prime editing, prime-enhancing peptides combine productively, and a top dual peptide-prime […]
    Minja Velimirovic
  • Small molecule inhibition of ATM kinase increases CRISPR-Cas9 1-bp insertion frequency August 26, 2021
    Mutational outcomes following CRISPR-Cas9-nuclease cutting in mammalian cells have recently been shown to be predictable and, in certain cases, skewed toward single genotypes. However, the ability to control these outcomes remains limited, especially for 1-bp insertions, a common and therapeutically relevant class of repair outcomes. Here, through a small molecule screen, we identify the ATM […]
    Heysol C Bermudez-Cabrera
  • Using CRISPR to understand and manipulate gene regulation April 29, 2021
    Understanding how genes are expressed in the correct cell types and at the correct level is a key goal of developmental biology research. Gene regulation has traditionally been approached largely through observational methods, whereas perturbational approaches have lacked precision. CRISPR-Cas9 has begun to transform the study of gene regulation, allowing for precise manipulation of genomic […]
    Ersin Akinci
  • Detection of gene cis-regulatory element perturbations in single-cell transcriptomes March 12, 2021
    We introduce poly-adenine CRISPR gRNA-based single-cell RNA-sequencing (pAC-Seq), a method that enables the direct observation of guide RNAs (gRNAs) in scRNA-seq. We use pAC-Seq to assess the phenotypic consequences of CRISPR/Cas9 based alterations of gene cis-regulatory regions. We show that pAC-Seq is able to detect cis-regulatory-induced alteration of target gene expression even when biallelic loss […]
    Grace Hui Ting Yeo
  • Machine learning based CRISPR gRNA design for therapeutic exon skipping January 8, 2021
    Restoring gene function by the induced skipping of deleterious exons has been shown to be effective for treating genetic disorders. However, many of the clinically successful therapies for exon skipping are transient oligonucleotide-based treatments that require frequent dosing. CRISPR-Cas9 based genome editing that causes exon skipping is a promising therapeutic modality that may offer permanent […]
    Wilson Louie
  • Chemogenetic System Demonstrates That Cas9 Longevity Impacts Genome Editing Outcomes December 30, 2020
    Prolonged Cas9 activity can hinder genome engineering as it causes off-target effects, genotoxicity, heterogeneous genome-editing outcomes, immunogenicity, and mosaicism in embryonic editing-issues which could be addressed by controlling the longevity of Cas9. Though some temporal controls of Cas9 activity have been developed, only cumbersome systems exist for modifying the lifetime. Here, we have developed a […]
    Vedagopuram Sreekanth
  • Comprehensive Mapping of Key Regulatory Networks that Drive Oncogene Expression November 25, 2020
    Gene expression is controlled by the collective binding of transcription factors to cis-regulatory regions. Deciphering gene-centered regulatory networks is vital to understanding and controlling gene misexpression in human disease; however, systematic approaches to uncovering regulatory networks have been lacking. Here we present high-throughput interrogation of gene-centered activation networks (HIGAN), a pipeline that employs a suite […]
    Lin Lin
  • Identification of determinants of differential chromatin accessibility through a massively parallel genome-integrated reporter assay September 25, 2020
    A key mechanism in cellular regulation is the ability of the transcriptional machinery to physically access DNA. Transcription factors interact with DNA to alter the accessibility of chromatin, which enables changes to gene expression during development or disease or as a response to environmental stimuli. However, the regulation of DNA accessibility via the recruitment of […]
    Jennifer Hammelman
  • A High-Throughput Genome-Integrated Assay Reveals Spatial Dependencies Governing Tcf7l2 Binding September 10, 2020
    Predicting where transcription factors bind in the genome from their in vitro DNA-binding affinity is confounded by the large number of possible interactions with nearby transcription factors. To characterize the in vivo binding logic for the Wnt effector Tcf7l2, we developed a high-throughput screening platform in which thousands of synthesized DNA phrases are inserted into […]
    Tomasz Szczesnik
  • Elucidation of remdesivir cytotoxicity pathways through genome-wide CRISPR-Cas9 screening and transcriptomics September 2, 2020
    The adenosine analogue remdesivir has emerged as a front-line antiviral treatment for SARS-CoV-2, with preliminary evidence that it reduces the duration and severity of illness¹.Prior clinical studies have identified adverse events^(1,2), and remdesivir has been shown to inhibit mitochondrial RNA polymerase in biochemical experiments⁷, yet little is known about the specific genetic pathways involved in […]
    Ersin Akinci
  • A Multiplexed Barcodelet Single-Cell RNA-Seq Approach Elucidates Combinatorial Signaling Pathways that Drive ESC Differentiation May 28, 2020
    Empirical optimization of stem cell differentiation protocols is time consuming, is laborintensive, and typically does not comprehensively interrogate all relevant signaling pathways. Here we describe barcodelet single-cell RNA sequencing (barRNA-seq), which enables systematic exploration of cellular perturbations by tagging individual cells with RNA "barcodelets" to identify them on the basis of the treatments they receive. […]
    Grace Hui Ting Yeo
  • Author Correction: Predictable and precise template-free CRISPR editing of pathogenic variants February 16, 2019
    In this Article, a data processing error affected Fig. 3e and Extended Data Table 2; these errors have been corrected online.
    Max W Shen
  • Predictable and precise template-free CRISPR editing of pathogenic variants November 9, 2018
    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 […]
    Max W Shen
  • A CRISPR view of gene regulation October 3, 2017
    Due to plummeting costs, whole genome sequencing of patients and cancers will soon become routine medical practice; however, we cannot currently predict how non-coding genotype affects cellular gene expression. Gene regulation research has recently been dominated by observational approaches that correlate chromatin state with regulatory function. These approaches are limited to the available genotypes and […]
    Budhaditya Banerjee
  • A CD47-associated super-enhancer links pro-inflammatory signalling to CD47 upregulation in breast cancer April 6, 2017
    CD47 is a cell surface molecule that inhibits phagocytosis of cells that express it by binding to its receptor, SIRPα, on macrophages and other immune cells. CD47 is expressed at different levels by neoplastic and normal cells. Here, to reveal mechanisms by which different neoplastic cells generate this dominant 'don't eat me' signal, we analyse […]
    Paola A Betancur
  • Self-Cloning CRISPR August 18, 2016
    CRISPR/Cas9-gene editing has emerged as a revolutionary technology to easily modify specific genomic loci by designing complementary sgRNA sequences and introducing these into cells along with Cas9. Self-cloning CRISPR/Cas9 (scCRISPR) uses a self-cleaving palindromic sgRNA plasmid (sgPal) that recombines with short PCR-amplified site-specific sgRNA sequences within the target cell by homologous recombination to circumvent the […]
    Mandana Arbab
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