Journal: Molecular cell

Article Title: CRAMP1 drives linker histone expression to enable Polycomb repression.

doi: 10.1016/j.molcel.2025.05.031

Figure Lengend Snippet: Figure 1. A genome-wide CRISPR-Cas9 genetic screen identifies an essential requirement for CRAMP1 and histone H1.4 in PRC2-mediated reporter repression (A) Schematic representation of GFP reporter repression by the PRC2 complex. (B) The GFP reporter is derepressed upon CRISPR-Cas9-mediated gene disruption of any of the three core PRC2 subunits, as assayed by flow cytometry. (C) A genome-wide CRISPR-Cas9 screen to identify factors required for PRC2 function. Following Cas9 expression in KBM-7 cells harboring the PRC2-sensitive GFP reporter, genome-wide mutagenesis was carried out with the Sabatini/Lander single guide RNA (sgRNA) library, 36 and GFP + cells isolated through two sequential rounds of FACS. ‘‘Significance’’ on the y axis represents the negative log of the ‘‘pos|score’’ metric reported by Model-based Analysis of Genome-wide CRISPR-Cas9 Knockout (MAGeCK). 37

Article Snippet: Single guide RNA (sgRNA) sequences were selected from the Sabatini/Lander Human CRISPR Pooled Library (Addgene #1000000100, kindly deposited by David Sabatini and Eric Lander 81 ) or the Brunello Human CRISPR Knockout Pooled Library (Addgene #73178, kindly deposited by David Root and John Doench 82 ).

Techniques: Genome Wide, CRISPR, Disruption, Flow Cytometry, Expressing, Mutagenesis, Isolation, Knock-Out

Journal: Molecular cell

Article Title: CRAMP1 drives linker histone expression to enable Polycomb repression.

doi: 10.1016/j.molcel.2025.05.031

Figure Lengend Snippet: Figure 5. Linker histones are not enriched at regions marked by H3K9me3 (A–D) Lack of linker histone enrichment at H3K9me3-marked genomic regions. (A) Tornado plots depicting linker histone CUT&Tag signal across H3K9me3 peaks from the ENCODE project; average signal intensity is shown in (B). (C) Heatmap depicting the lack of correlation between linker histone occupancy and H3K9me3. Cells are annotated with pairwise Spearman correlation coefficients. An example locus is shown in (D). (E) CUT&Tag faithfully profiles H3K9me3. Example loci comparing CUT&Tag versus H3K9me3 ChIP-seq data (ENCODE) are shown. (F and G) Linker histone insufficiency does not impair H3K9me3-dependent LINE-1 silencing by the HUSH complex. (F) Schematic representation of the dual- color reporter cell line designed to monitor both H3K9me3-dependent repression by the HUSH complex and linker histone-mediated PRC2-reporter repression. (G) HUSH-mediated LINE-1 silencing is unaffected upon CRAMP1 depletion. The indicated CRISPR sgRNAs were expressed in the dual-color reporter cell line, and GFP and iRFP fluorescence assayed by flow cytometry. See also Figure S5 and Table S2.

Article Snippet: Single guide RNA (sgRNA) sequences were selected from the Sabatini/Lander Human CRISPR Pooled Library (Addgene #1000000100, kindly deposited by David Sabatini and Eric Lander 81 ) or the Brunello Human CRISPR Knockout Pooled Library (Addgene #73178, kindly deposited by David Root and John Doench 82 ).

Techniques: ChIP-sequencing, CRISPR, Fluorescence, Flow Cytometry

Journal: Cell systems

Article Title: Illuminating Host-Mycobacterial Interactions with Genome-wide CRISPR Knockout and CRISPRi Screens.

doi: 10.1016/j.cels.2020.08.010

Figure Lengend Snippet: Figure 1. A Pooled Approach for CRISPR Knockout and CRISPRi Screening in Human THP-1 Cells (A) Strategy for preparing CRISPR libraries and performing genetic screens. (B) THP-1-mediated phagocytosis of M. bovis BCG after three rounds of infection (MOI 10:1) with induced green fluorescence (map24::GFP) (Scale bar, 20 mm). (C) Viability of host cells after three rounds of M. bovis BCG infection. (D and E) Expression of Cas9 (D) and dCas9-KRAB (E) in 9 randomly selected monoclonal THP-1 cells. Wild-type THP-1 cells were used as negative control. Vinculin was used as a loading control. (F) An sgRNA for EGFP was introduced in both wild-type and Cas9-expressing THP-1 cells using a lentivirus (pXPR-011) that also contains EGFP as a target (Scale bar, 20 mm). (G) Cas9-expressing THP-1 cells were transduced with an sgRNA targeting AAVS1 at a low MOI. Mutations at the AAVS1 locus were detected by SURVEYOR assay. The size of the AAVS1 amplicon is 500 bp. The cleaved product sizes are 320 and 180 bp. (H) Growth measurement associated with sgRNAs targeting INTS9, MCM2, and non-targeting negative controls sgNC1 and sgNC13. (I and J) RT-qPCR analysis of INTS9 (I) and MCM2 (J) expression in dCas9-KRAB-expressing THP-1 cells. The values are normalized to GAPDH (glyceraldehyde- 3-phosphate dehydrogenase). Data represent the mean ± SD (n = 3) (two-tailed unpaired Student’s t test, *p < 0.05 **p < 0.01 ***p < 0.001). See also Figure S1; Table S13.

Article Snippet: Human CRISPR knockout pooled library (Brunello) was obtained from Addgene (#73178).

Techniques: CRISPR, Knock-Out, Infection, Expressing, Negative Control, Control, Transduction, Amplification, Quantitative RT-PCR, Two Tailed Test

Journal: Cell systems

Article Title: Illuminating Host-Mycobacterial Interactions with Genome-wide CRISPR Knockout and CRISPRi Screens.

doi: 10.1016/j.cels.2020.08.010

Figure Lengend Snippet: Figure 2. Genome-wide Pooled CRISPR Knockout and CRISPRi Screens to Dissect Biological Pathways in Mycobacterial Infection (A and B) Volcano plots from CRISPR knockout (A) and CRISPRi (B) screens. For each sgRNA-targeted gene, the x axis shows its enrichment or depletion post- infection, and the y axis shows statistical significance measured by p value. Positive and negative screen hits are labeled as red and green dots, respectively. Gray dots represent non-targeting controls. For each screen, experiments were carried out in triplicate. (C) Enriched genes in the Venn diagram were filtered with a cut-off of FDR <0.1 and log2-fold change >1 in M. bovis BCG infection. The degree of significance of the overlap is given. (D) Gene-centric visualization of average fold change of CRISPR knockout and CRISPRi screens in infected versus non-infected host cells. Selected type I IFN and AHR/ARNT pathway components are highlighted in orange and blue. (E and F) Candidate genes identified by CRISPR knockout (E) and CRISPRi (F) screens were functionally categorized to understand the changes in biological functions involved in M. bovis BCG infection. Pathways shown in red are those identified by both screens. Color gradient of nodes represents the enrichment scores of gene sets. Node size represents the number of genes in the gene set. Edge width represents mutual overlap of genes. See also Figures S2 and S3; Tables S1, S2, S3, S4, S5, S11, and S12.

Article Snippet: Human CRISPR knockout pooled library (Brunello) was obtained from Addgene (#73178).

Techniques: Genome Wide, CRISPR, Knock-Out, Infection, Labeling

Journal: Cell systems

Article Title: Illuminating Host-Mycobacterial Interactions with Genome-wide CRISPR Knockout and CRISPRi Screens.

doi: 10.1016/j.cels.2020.08.010

Figure Lengend Snippet: Figure 3. Secondary CRISPR Knockout and CRISPRi Screens Identify Host Genetic Hits in Mycobacterial Infection (A) Enriched genes were filtered with a cut-off of FDR <0.05 and log2-fold change >0.5 in M. bovis BCG infection. The degree of significance of the overlap is given. (B) Validation rate of genetic hits in secondary screens grouped by their p values in primary genome-wide screens in M. bovis BCG infection. Number of genes per category is indicated. (C) Genetic hits from both primary and secondary screens were ranked by their differential sgRNA abundance between M. bovis BCG-infected versus uninfected populations (log2 fold change). (D) Heatmap of screen hits (log2 fold change) clustered in different biological pathways in M. bovis BCG infection. See also Figures S4 and S5; Tables S6, S7, S8, S9, and S10.

Article Snippet: Human CRISPR knockout pooled library (Brunello) was obtained from Addgene (#73178).

Techniques: CRISPR, Knock-Out, Infection, Biomarker Discovery, Genome Wide

Journal: bioRxiv

Article Title: CRlSPR/Cas9 screening revealed BlRC6-AS1 /BlRC6 mediates abiraterone resistance via NHEJ pathway-dependent A20 degradation in prostate cancer

doi: 10.1101/2025.10.01.679907

Figure Lengend Snippet: ( A ) Schematic of CRISPR-Cas9 screens: A lentiviral sgRNA library was transduced into PC3-Cas9 cells, which were then treated with DMSO or Abiraterone, respectively. After 28 days, sgRNAs were extracted for NGS. ( B ) Box plots displaying sgRNA distribution in the experimental groups from lncRNA CRISPR-Cas9 library: D0-DMSO (baseline), D28-DMSO (vehicle control), and D28-Abiraterone (treatment). ( C and D ) Volcano plots showing depleted (red; RRA Score ≤ 0.05, -log□FC ≥ 2) and enriched (blue; RRA Score ≤ 0.05, log□FC ≥ 2) genes. Screening analysis was performed with MaGeCK RRA. ( C ) Negative selection identified 523 abiraterone resistance-associated LncRNAs and 553 essential LncRNAs. ( D ) Positive selection revealed 717 LncRNAs associated with abiraterone sensitivity and 169 essential LncRNAs. ( E ) Venn diagram showed negatively selected genes from two comparisons: Abiraterone vs Control and Control vs D0. ( F ) MAGeCK analysis results displayed a ranking of genes based on their RRA scores. ( G ) Frequency distribution of log2 fold change for all sgRNAs (top) and log2 fold change of individual sgRNAs for representative candidates (bottom). Enriched and depleted sgRNA hits were indicated by red and blue vertical bars, respectively. ( H ) The RRA score distribution plot revealed the top 10 candidate LncRNAs associated with abiraterone resistance. ( I-N ) Cell viability assays in PC3 ( I-K ) and DU145 ( L-N ) cells treated with 0-70 μM abiraterone for 48h, following transduction with either control sgRNAs or sgRNAs targeting candidate lncRNAs: RP11-1079K10.3 ( I and L ), WWTR1-AS1 ( J and M ), and RP11-49K24.4 ( K and N ). Data are shown as the mean ± SD (n = 4 biological replicates). Data were analyzed by two-way analysis of variance (ANOVA) with Dunnett’s multiple comparisons test ( I-N ).

Article Snippet: PC3-Cas9 cells (4×10 ) were transduced with either the Splicing-targeting CRISPR-Cas9 library for human lncRNAs (Addgene, Cat# 119977) or the Human genome-wide lentiviral CRISPR gRNA library version 1 (Addgene, Cat# 67989) at a multiplicity of infection (MOI) of 0.3, ensuring single gRNA integration per cell.

Techniques: CRISPR, Control, Selection, Transduction

Journal: Emerging microbes & infections

Article Title: Betacoronaviruses SARS-CoV-2 and HCoV-OC43 infections in IGROV-1 cell line require aryl hydrocarbon receptor.

doi: 10.1080/22221751.2023.2256416

Figure Lengend Snippet: Figure 4. Genome-scale CRISPR screens identified AHR as a common host factor for SARS-CoV-2 and HCoV-OC43. (A) Schematic diagram of CRISPR-Cas9 KO screen workflow. (B) Overlapped MAGeCK RRA scores of SARS-CoV-2 (x axis) and HCoV-OC43 screens (y axis). The values depicted are – Log10 of negative selection scores of the gene summary output files. (C) SARS-CoV-2 viral titre in IGROV-1 WT, AHR KO, and AHR KO with cDNA complementation. KO cells were transduced with a lentivirus carrying GFP protein to control for unspecific lentivirus transduction effects. Data are represented as mean ± SEM (n = 3). (D) HCoV-OC43 viral titre in IGROV-1 WT, AHR KO, and AHR KO with cDNA complementation (left), as well as nucleocapsid (N) protein accumulation following infection (right). KO cells were transduced with a lentivirus carrying GFP protein to control for unspecific lentivirus transduction effects. TCID50 data are represented as mean ± SEM (n = 3). GAPDH levels were used as internal controls for the western blots. LOD denotes the “limit of detection.” N.D. denotes “not detected.”

Article Snippet: Firstly, single guide RNA (sgRNA) sequence against AHR was obtained from human CRISPR Brunello lentiviral pooled libraries (Addgene, #73178).

Techniques: CRISPR, Selection, Transduction, Control, Infection, Western Blot

Journal: Blood Neoplasia

Article Title: Targeting HASPIN kinase disrupts SR protein–mediated RNA splicing and synergizes with BCL-2 inhibitor venetoclax in AML

doi: 10.1016/j.bneo.2025.100107

Figure Lengend Snippet: A kinase domain–targeted CRISPR screen identifies HASPIN as a novel dependency in AML cells. (A) Schematic of human kinase domain–targeted CRISPR screen in 2 t(8;21) AML cell lines, Kasumi-1 and SKNO-1. (B) Gene rank plots (left) and volcano plots (right) depicting significant kinase hits in the kinase domain–targeted CRISPR screens. Top candidates determined by CRISPR score as calculated by MAGeCK robust ranking aggregation (RRA) (left) and a log 2 (fold change) ≤−1.0 and false discovery rate (FDR) ≤0.05 significance cutoff (right). White diamonds indicate top 10 kinase hits in each plot. (C) Bubble plot of preranked gene set enrichment analysis results performed on top kinases identified by CRISPR screen in Kasumi-1 and SKNO-1 AML cell lines. Fill color indicates normalized enrichment score (NES). Size indicates significance by –log 10 (FDR). Facets indicate Molecular Signatures Database (MSigDB) gene set collection. (D) Density plot of all individual sgRNA log 2 (fold change) values in the kinase domain–targeted library. For selected genes, log 2 (fold change) values of corresponding sgRNAs depicted for Kasumi-1 and SKNO-1 cell lines relative to all other library sgRNAs (red, blue, and gray, respectively). (E) Competitive proliferation assay of Kasumi-1 or SKNO-1 cells expressing nontargeting negative control, RPA3-targeting positive control, or 1 of 2 HASPIN-targeting sgRNAs derived from CRISPR screen. Relative changes in cell proliferation rate measured by percentage of GFP-positive cells relative to nontargeting control on each day. Data are mean ± standard deviation (SD) of 4 independent experiments. CGP, chemical, genetic perturbation; CP, canonical pathway.

Article Snippet: CRISPR screen was performed using the human kinase domain–focused CRISPR knockout (KO) library (Addgene 117725; a gift from Christopher Vakoc) and 2 t(8;21) AML cell lines.

Techniques: CRISPR, Proliferation Assay, Expressing, Negative Control, Positive Control, Derivative Assay, Control, Standard Deviation

Journal: Blood Neoplasia

Article Title: Targeting HASPIN kinase disrupts SR protein–mediated RNA splicing and synergizes with BCL-2 inhibitor venetoclax in AML

doi: 10.1016/j.bneo.2025.100107

Figure Lengend Snippet: HASPIN is a clinically relevant, general leukemia dependency. (A) Bar plot depicting mean log 2 (fold change) of HASPIN targeting sgRNA genome-wide CRISPR screen performed in several leukemia cell lines as reported by Wang et al. Screen data were retrieved from BIOGRID ORCS. Dotted line indicates author-specified significance cutoff. (B) Competitive proliferation assay of THP-1 or OCI-AML3 cells expressing nontargeting negative control, RPA3-targeting positive control, or 1 of 2 HASPIN-targeting sgRNAs derived from CRISPR screen. Relative changes in cell proliferation rate measured by percentage of GFP-positive cells relative to nontargeting control on each day. Data are mean ± SD of 4 independent experiments per cell line. (C) Box plots depicting median HASPIN mRNA expression in the TCGA-LAML patient cohort separated by AML subtype. MLL (KMT2A) or RUNX1-RUNX1T1 t(8;21) translocation cohorts are highlighted in green and orange, respectively. Individuals with KMT2A structural variants are indicated with purple diamonds. (D) Box plots depicting median HASPIN mRNA expression in the BEAT-AML (2022) patient cohort separated by AML subtype. MLL (KMT2A) or RUNX1-RUNX1T1 t(8;21) translocation cohorts are highlighted in green and orange, respectively. Individuals with KMT2A structural variants are indicated with purple diamonds. (E) Kaplan-Meier survival curve depicting comparison of overall survival of patients with TCGA-LAML belonging to the top quartile (red) and bottom quartile (blue) of HASPIN expression. Plot and data derived from GEPIA2. (F) Forest plot of hazard ratios from multivariate Cox proportional hazard analysis of overall survival of patients with TCGA LAML incorporating HASPIN expression level and significant clinical and genetic factors. High and low HASPIN -expressing patients belong to the top and bottom expression quartiles, respectively. Clinical variables include the following: patient sex (Sex), age at first diagnosis (Diagnosis_Age), genetic risk group (Risk_Group), FLT3 mutation status (FLT3_Status), NPM1 mutation status (NPM1_Status), DNMT3A mutation status (DNMT3A_Status), TP53 mutation status (TP53_Status), and NRAS mutation status (NRAS_Status). Clinical metadata and mutation calls derived from the Genomic Data Commons TCGA LAML project patient information. N.D., not defined; NOS, not otherwise specified; NP, not profiled.

Article Snippet: CRISPR screen was performed using the human kinase domain–focused CRISPR knockout (KO) library (Addgene 117725; a gift from Christopher Vakoc) and 2 t(8;21) AML cell lines.

Techniques: Genome Wide, CRISPR, Proliferation Assay, Expressing, Negative Control, Positive Control, Derivative Assay, Control, Translocation Assay, Comparison, Biomarker Discovery, Mutagenesis

Journal: Blood Neoplasia

Article Title: Targeting HASPIN kinase disrupts SR protein–mediated RNA splicing and synergizes with BCL-2 inhibitor venetoclax in AML

doi: 10.1016/j.bneo.2025.100107

Figure Lengend Snippet: HASPIN inhibitor CHR-6494 effectively targets AML and synergizes with BCL-2 inhibition. (A) Dose-response curves (left) and IC comparison (right) of Kasumi-1 and healthy CD34 + hematopoietic progenitor cells treated with CHR-6494. IC values determined by nonlinear regression. Data on curve are mean ± SD of technical triplicates. Representative curves of 3 independent experiments revealed. Data on bar plot are mean ± SD of 3 independent experiments. Significance determined by unpaired 2-tailed Student t test. ∗∗∗∗ P < .0001. (B) Bar plots comparing CHR-6494 IC values in leukemia cell lines. IC values determined by dose-response curve with nonlinear regression for each cell line. Data are mean ± SD of 3 independent experiments. Dotted line indicates CHR-6494 IC value of healthy CD34 + hematopoietic progenitor cells determined in panel A. (C) Bar plots depicting normalized HASPIN sgRNA counts in a genome-wide CRISPR screen in MOLM-13 cells treated with either DMSO or VEN for 8 or 16 days as performed by Chen et al. Screen data were retrieved from BIOGRID ORCS. Counts were normalized to initial time point (d0). One data point was removed from DMSO (d16) as a significant outlier. Data are mean ± SD. Significance determined by 1-way ANOVA with Holm-Sidak multiple comparison correction. ∗ P < .05; ∗∗ P < .01. (D) Dose-response matrix (left) and corresponding zero interaction potency (ZIP) drug synergy contour plot (right) of Kasumi-1 cells treated with CHR-6494 and VEN combination for 48 hours. Each cell represents drug combined at indicated concentrations. Treatment response is percent inhibition; higher values indicate lower cell viability. Synergy scores represent ZIP synergy calculations of inhibition effects exceeding values expected between 2 noninteracting agents. Mean synergy scores and significance reported at top of respective contour plot. Representative plots of 3 independent experiments revealed. (E) Dose-response matrix (left) and corresponding ZIP drug synergy contour plot (right) of THP-1 cells treated with CHR-6494 and VEN combination for 48 hours. Each cell represents drug combined at indicated concentrations. Treatment response is percent inhibition; higher values indicate lower cell viability. Synergy scores represent ZIP synergy calculations of inhibition effects exceeding values expected between 2 noninteracting agents. Mean synergy scores and significance reported at top of respective contour plot. Representative plots of 3 independent experiments revealed. (F) Dose-response matrix (left) and corresponding ZIP drug synergy contour plot (right) of OCI-AML3 cells treated with CHR-6494 and VEN combination for 48 hours. Each cell represents drug combined at indicated concentrations. Treatment response is percent inhibition; higher values indicate lower cell viability. Synergy scores represent ZIP synergy calculations of inhibition effects exceeding values expected between 2 noninteracting agents. Mean synergy scores and significance reported at top of respective contour plot. Representative plots of 3 independent experiments revealed. DMSO, dimethyl sulfoxide.

Article Snippet: CRISPR screen was performed using the human kinase domain–focused CRISPR knockout (KO) library (Addgene 117725; a gift from Christopher Vakoc) and 2 t(8;21) AML cell lines.

Techniques: Inhibition, Comparison, Genome Wide, CRISPR