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4d nucleofector x

Manufactured by Lonza
Sourced in United States

The 4D-Nucleofector X is a laboratory instrument designed for the efficient transfection of cells. It uses a proprietary Nucleofection technology to deliver nucleic acids, such as DNA or RNA, into a wide range of cell types. The core function of the 4D-Nucleofector X is to facilitate the introduction of genetic material into cells, enabling researchers to study gene function, perform gene editing, or express recombinant proteins.

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14 protocols using 4d nucleofector x

1

CRISPR-Cas9 Knockout of DNA Repair Genes in mESCs and CH12F3 Cells

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The mESCs were cultured in ES-DMEM medium (Millipore) with 15% Fetal Bovine Serum (FBS, ExCell Bio), Penicillin/Streptomycin (Corning), nucleotides (Millipore), l-glutamine (Corning), nonessential amino acids (Corning), PD0325901 (Selleck), CHIR99021 (Selleck) and LIF (Millipore) at 37°C with 5% CO2. mESCs in 6-cm dishes were transfected with 7.2 μg pX330-Cas9 plus 1.8 μg GFP expression vector by 4D-nucleofector X (Lonza, solution Cytomix, program GC104), then harvested for genomic DNA 3 days after transfection.
The wild-type, Ku80–/–, Lig4–/–, Parp1–/– and AID–/– CH12F3 cells were cultured in RPIM1640 medium (Corning) with 15% Fetal Bovine Serum (FBS, ExCell Bio), HEPES (Corning), penicillin–streptomycin (Corning), l-glutamine (Corning), nonessential amino acids (Corning), sodium pyruvate (Corning) and β-mercaptoethanol (Sigma-Aldrich) at 37°C with 5% CO2. Growing CH12F3 cells were transfected with 1.5 μg pX330-Cas9 or pX330-Cas9-mCherry expression vector per million by 4D-nucleofector X (Lonza, solution M1, procedure DN100) and seeding at 0.5 million cells/ml in fresh medium with 1 μg/ml anti-CD40, 5 ng/ml IL-4 and 0.5 ng/ml TGF-β. After 72 h stimulation, the cells were harvested and genomic DNA was extracted for PEM-seq library construction.
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2

Optimized CRISPR-mediated genome editing in mESCs and CH12F3 cells

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The mESCs were cultured in ES-DMEM medium (Millipore) with 15% fetal bovine serum (FBS, ExCell Bio), Penicillin/Streptomycin (Corning), Nucleotides (Millipore), L-Glutamine (Corning), Nonessential Amino Acids (Corning), PD0325901 (Selleck), CHIR99021 (Selleck) and LIF (Millipore) at 37°C with 5% CO2. mESCs in 6-cm dishes were transfected with 7.2 μg pX330-Cas9 plus 1.8 μg GFP expression vector by 4D-nucleofector X (Lonza, solution Cytomix, program GC104), then harvested for genomic DNA 3 days after transfection.
The wild-type, Ku80 -/-, Lig4 -/-, Parp1 -/-, and AID -/-CH12F3 cells were cultured in RPIM1640 medium (Corning) with 15% Fetal Bovine Serum (FBS, ExCell Bio), HEPES (Corning), Penicillin-Streptomycin (Corning), L-Glutamine (Corning), Nonessential Amino Acids (Corning), Sodium Pyruvate (Corning) and β-Mercaptoethanol (Sigma-Aldrich) at 37°C with 5% CO2. Growing CH12F3 cells were transfected with 1.5 μg pX330-Cas9 or pX330-Cas9-mCherry expression vector per million by 4D-nucleofector X (Lonza, solution M1, procedure DN100) and seeding at 0.5 million cells/mL in fresh medium with 1μg/mL anti-CD40, 5 ng/mL IL-4, and 0.5 ng/mL TGF-β. After 72 hrs stimulation, the cells were harvested and genomic DNA was extracted for PEM-seq library construction.
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3

Gene Editing of Immune Cell Lines

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K562, Raji, and Ramos 2G6 (CRL-1923) cells were obtained from ATCC. Cell lines were cultured in RPMI supplemented with 10% FBS and 1% penicillin/streptomycin. For gene editing, 2 × 105 cells (K562) or 4 × 105 cells (Raji and Ramos) were pelleted by centrifugation and washed with PBS. AAV6 transductions were performed in 10 μL of serum-free RPMI media for 1 hour at 37°C in a 96-well U-bottom plate prior to electroporation, as previously described.33 Cas9 RNPs were complexed by mixing 3000 ng TrueCut Cas9 protein v2 (Thermo Fisher) with 60 pmol of gRNA (Synthego) for 15 minutes at room temperature.
Cells were then washed with PBS and resuspended in 20 μL of SF (K562) or SG (Raji and Ramos) buffer (Lonza) and mixed with Cas9 RNPs. If appropriate, cells were also mixed with 1.4–2 μg of plasmid homology donors or 100 pmol phosphorothioate-modified ssODNs as previously described.59 Electroporations were performed with the 4D-X Nucleofector (Lonza). K562 cells used pulse code FF-120, Raji cells used pulse code DS-104, and Ramos cells used pulse code CA-137.
J3-, A6-, or GFP-edited Raji and Ramos cells were expanded in culture. J3 and A6-edited cells were stained with anti-IgG-Fc antibody (BioLegend, clone M1310G05). Cells were sorted on a FACSAria II cell sorter based on membrane IgG expression (J3 and A6 editing) or GFP expression.
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4

Gene Editing in Hematopoietic Cell Lines

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K562, Raji, and Ramos 2G6 (CRL-1923) cells were obtained from ATCC. Cell lines were cultured in RPMI supplemented with 10% FBS and 1% penicillin/streptomycin. For gene editing, 2 x 105 cells (K562) or 4 x 105 cells (Raji and Ramos) were pelleted by centrifugation and washed with PBS. AAV6 transductions were performed in 10 μL of serum-free RPMI media for 1 hour at 37°C in a 96-well U-bottom plate prior to electroporation, as previously described.33 (link) Cas9 RNPs were complexed by mixing 3000 ng TrueCut Cas9 protein v2 (Thermo Fisher) with 60 pmol of gRNA (Synthego) for 15 minutes at room temperature.
Cells were then washed with PBS and resuspended in 20 μL of SF (K562) or SG (Raji and Ramos) buffer (Lonza) and mixed with Cas9 RNPs. If appropriate, cells were also mixed with 1.4-2 μg of plasmid homology donors or 100 pmol phosphorothioate-modified ssODNs as previously described.59 (link) Electroporations were performed with the 4D-X Nucleofector (Lonza). K562 cells used pulse code FF-120, Raji cells used pulse code DS-104, and Ramos cells used pulse code CA-137.
J3-, A6-, or GFP-edited Raji and Ramos cells were expanded in culture. J3 and A6-edited cells were stained with anti-IgG-Fc antibody (BioLegend, clone M1310G05). Cells were sorted on a FACSAria II cell sorter based on membrane IgG expression (J3 and A6 editing) or GFP expression.
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5

Fluorescent Transfection Techniques for Cell Imaging

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HFF transfections were performed with the Lonza 4DX Nucleofector using the P2 Primary Cell Solution kit (PBP2-02250) and the NHDF transfection protocol. Transfections were performed with 1–1.5 μg of pEGFP–N1-α-actinin-1 (a gift from Carol Otey, University of North Carolina, Chapel Hill; Addgene plasmid 11908), 1 μg of pCMV-LifeAct-TagRFP (purchased from Ibidi), 1.4 μg of tdTomato–paxillin-22 (a gift from Michael Davidson, National High Magnetic Field Laboratory and Department of Biological Science, Florida State University; deceased 2015; Addgene 58123), pEGFP-MRLC1 (a gift from Tom Egelhoff, Lerner Research Institute, Cleveland Clinic; Addgene 356801), and/or RFP-zyxin (a gift from Anna Huttenlocher, University of Wisconsin–Madison; Addgene plasmid 26720; Bhatt et al., 2002 ).
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6

Efficient AAV Transduction of Cell Lines

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HEK293T cells and HeLa cells were cultured in DMEM supplemented with 10% FBS and 1% penicillin/streptomycin. Cells were seeded overnight to adhere to plates and washed once with PBS prior to AAV transduction in DMEM, with or without FBS or human AB serum. FBS was heat-inactivated at 56°C water bath for 30 min. AAV vectors were added to cells at indicated MOIs, and after 4 h at 37°C, 10% FBS (final volume) was restored to the culture if appropriate.
K562, Raji, and Molt4.8 cells were cultured in RPMI-1640 medium supplemented with 10% FBS and 1% penicillin/streptomycin. Cells were washed twice with PBS, seeded into plates at indicated cell concentrations in RPMI-1640, with or without FBS or human AB serum, and transduced with AAV vectors at indicated MOIs at 37°C. After 2 h (or as indicated), 10% FBS (final volume) was restored to the culture if appropriate. Electroporation of K562 cells was performed using a SF Cell Line 4D-Nucleofector kit and 4D-X Nucleofector using pulse code FF-120 (Lonza, Basel, Switzerland), per the manufacturer’s recommendations. After 2 days, GFP expression was measured by flow cytometry, and vector copy numbers were measured by Droplet Digital PCR (ddPCR) as previously described.36 (link) Detailed protocols for AAV copy number determination are provided in the supplemental methods.
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7

AAV Transduction of Cell Lines

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HEK-293T cells and HeLa cells were cultured in DMEM supplemented with 10% FBS and 1% penicillin/streptomycin. Cells were seeded overnight to adhere to plates and washed once with PBS prior to AAV transduction in DMEM, with or without FBS or human AB serum. FBS was heat-inactivated at 56°C water bath for 30 mins. AAV vectors were added to cells at indicated MOIs, and after 4 h at 37°C, 10% FBS (final volume) was restored to the culture if appropriate. K562, Raji, and Molt4.8 cells were cultured in RPMI-1640 medium supplemented with 10% FBS and 1% penicillin/streptomycin. Cells were washed twice with PBS, seeded into plates at indicated cell concentrations in RPMI-1640, with or without FBS or human AB serum, and transduced with AAV vectors at indicated MOIs at 37°C. After 2 h (or as indicated), 10% FBS (final volume) was restored to the culture if appropriate. Electroporation of K562 cells was performed using a SF Cell Line 4D-Nucleofector kit and 4D-X Nucleofector using pulse code FF-120 (Lonza, Basel, Switzerland), per the manufacturer's recommendations. After 2 days, GFP expression was measured by flow cytometry and vector copy numbers were measured by ddPCR as previously described. 39 Detailed protocols for AAV copy number determination are provided in the Supplemental Information.
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8

Knockdown and Knockout of TRIM Proteins in A549 Cells

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For siRNA-mediated knockdown (KD), A549 cells in Opti-MEM™ Reduced Serum Medium supplemented with 5% (v/v) FCS were seeded into 24-well tissue culture plates and incubated overnight. Cells were then transfected with 10 nM of siRNAs specific for TRIM16 or with the non-targeting control (NTC) (SiGENOME SMART pool, Dharmacon, Lafayette, CO, USA) using Lipofectamine RNAiMAX (Thermo Fisher Scientific), according to manufacturer’s instructions. At 72 h after siRNA treatment, cells were either harvested for qPCR or infected with different viruses to assess virus growth.
For CRISPR/Cas9 editing, specific guide RNA (sgRNA) for TRIM16, TRIM22, or Scrambled guides were obtained from Synthego. The sgRNA and Cas9 protein (Alt-R® S.p. Cas9 Nuclease V3, IDT, CAT: 1081059) were then used for genome editing using the Lonza 4D Nucleofection system (Lonza, Singapore), according to manufacturer’s instructions. Cells were transfected using the nucleofector machine (4D-Nucleofector® X, Lonza) using pre-programmed settings (CM-130) suitable for A549 cells. After nucleofection, cells were seeded into 12-well tissue culture plates and expanded for subsequent experiments. All experiments with TRIM16 KO bulk populations were performed within 10 passages of nucleofection. Single-cell clones were prepared from bulk populations by limiting dilution.
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9

CRISPR Clover-LMNA HDR Assay Protocol

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The CRISPR Clover-LMNA HDR assay was adapted from refs. 17 (link) and 18 (link). U2OS cells were seeded and transfected with siCtrl or PALB2 small interfering RNA (siRNA) (Supplementary Information) for a final concentration of 50 nM, using Lipofectamine RNAiMAX (Invitrogen). Twenty-four hours post-transfection, 1 × 106 cells were retransfected with 1 μg of pCR2.1-CloverLMNAdonor, 1 μg pX330-LMNAgRNA1, 1 μg pcDNA3 empty vector or the indicated siRNA-resistant flag-tagged PALB2 construct (Supplementary Information), 0.1 g of piRFP670-N1 (used as transfection control), and 200 pmol of siRNA using the 4D-Nucleofector X (Lonza).19 (link) After 48 hours, cells were replated on glass coverslips, fixed with 4% paraformaldehyde, and expression of mClover-LMNA (indicative of successful HDR) was assayed by fluorescence microscopy. Data represent the mean percentages (± SEM) of mClover-LMNA–positive cells over the iRFP670-positive population from five independent experiments (total n > 500 iRFP-positive cells/condition).
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10

Targeted Genome Editing in CF2-iPS3 Cells

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CF2-iPS3 cells were co-transfected with the donor DNA plasmid (CF2A or CF2B) in the absence or presence of CRISPR/Cas9n-gRNAs. Briefly, CF2-iPS3 cells were harvested as single cell suspension with Accutase (StemCell Inc.). Then, 1.5 × 106 cells were nucleofected with 2.5 μg of donor DNA plasmid with or without 2.5 μg of each pairs of CRISPR/Cas9n-gRNAs using the 4D Nucleofector X (Lonza) with the P3 Primary Cell solution and Program CA137. Transfected CF2-iPS3 cells were plated in mTeSR1 supplemented with 10 μM Y27632 in Matrigel-coated plate for 24 h post transfection. Two to 3 days after transfection, the culture medium was switched to the selection medium, mTeSR1 containing 0.5–1.0 μg/ml of Puromycin (Sigma Aldrich), and the cells were continuously cultured under Puromycin selection up to 14 days. During the selection, 7–10 days post-transfection, all colonies were manually picked and individually transferred to 24-well plates coated with Matrigel. Genomic DNA was isolated from individual clones and amplified by PCR with primers AP1/AP2, AP3/AP4, and P6r/P7f to screen for successful vector replacement and insertion events, and each PCR product was separated on a 1-2% agarose gel containing ethidium bromide and visualized under UV light.
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