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5 protocols using facsaria 2

1

Isolation and Sequencing of SARS-CoV-2 Specific B Cells

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Peripheral blood samples from convalescent COVID-19 subjects were obtained with informed consent under the approval of the University of Washington Institutional Review Board (Gale Lab; 00009810) and isolated as previously described (Rodda et al., 2021 (link)). Briefly, peripheral blood mononuclear cells were thawed, washed, and stained with a decoy tetramer and then RBD tetramer; bound cells were magnetically enriched (Miltenyi Biotec) and stained with surface antibodies. Single tetramer-positive B cells were index-sorted using a FACS Aria II and collected in 96-well plates containing SMART-Seq v4 capture buffer (Takara Bio) for BCR sequencing.
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2

Alkbh5 Knockout Lin- Cell Sorting

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Lin cells from Alkbh5fl/fl and Alkbh5fl/flMx1-Cre mice were sorted using FACS AriaII flow cytometer and resuspended in Trizol (RNAiso Reagent; TaKaRa). All samples were processed and sequenced at Lianchuan Biotechnology Corporation, Hangzhou, China.
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3

Single-cell Plasmablast Isolation Protocol

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All procedures involving animals were performed in accordance with guidelines of Institutional Animal Care and Use Committee of Washington University in Saint Louis (protocol number 21-0053). Two female C57BL/6J mice (Jackson Laboratories) were immunized intramuscularly and boosted nine weeks later with 15 µg EtpA emulsified in PBS and AddaVax (InvivoGen). Draining iliac and inguinal lymph nodes were collected four days after boosting and single cell suspensions were prepared for plasmablast sorting. Cells were stained for 30 min on ice with CD138-BV421 (281-2, 1:200), IgD-FITC (11-26c.2a, 1:100), CD19-PE (1D3, 1:200), CD38-PE-Cy7 (90, 1:200), Fas-APC (SA367H8, 1:400), CD3-APC-Cy7 (17A2, 1:100), and Zombie Aqua (Biolegend) diluted in PBS supplemented with 2% FBS and 2mM EDTA. Cells were washed twice and single PBs (CD138+ CD38lo CD19+/lo CD3 live singlet lymphocytes) were sorted using a FACSAria II into 96-well plates containing 2 µL Lysis Buffer (Clontech) supplemented with 1 U/µL rNase inhibitor (NEB) and immediately frozen on dry ice.
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4

Sorting and Profiling Plasmablasts

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Staining for sorting was performed using cryo-preserved PBMCs in 2% FBS and 2 mM ethylenediaminetetraacetic acid (EDTA) in PBS (P2). Cells were stained for 30 min on ice with CD20-Pacific Blue (2H7, 1:400), Zombie Aqua, CD71-FITC (CY1G4, 1:200), IgD-PerCP-Cy5.5 (IA6–2, 1:200), CD19-PE (HIB19, 1:200), CD38-PE-Cy7 (HIT2, 1:200), and CD3-Alexa 700 (HIT3a, 1:200), all BioLegend. Cells were washed twice, and single plasmablasts (live singlet CD19+ CD3 IgDlo CD38+ CD20 CD71+) were sorted using a FACSAria II into 96-well plates containing 2 μL Lysis Buffer (Clontech) supplemented with 1 U/μL RNase inhibitor (NEB) and immediately frozen on dry ice, or bulk sorted into PBS supplemented with 0.05% BSA and processed for single cell RNAseq.
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5

Sorting SARS-CoV-2 RBD-Specific Plasma Cells

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Staining for sorting was performed using fresh lymph node single cell
suspensions in PBS supplemented with 2% FBS and 1mM EDTA (P2). Cells were
stained for 30 min on ice with biotinylated recombinant SARS-CoV-2 RBD diluted
in P2, washed twice, then stained for 30 min at 4°C with Fas-PE (Jo2, BD
Pharmingen), CD4-eFluor 780 (GK1.5, eBioscience), CD138-BV421 (281–2),
IgD-FITC (11–26c.2a), GL7-PerCP-Cy5.5, CD38-PE-Cy7 (90), CD19-APC (1D3),
and Zombie Aqua (all Biolegend) diluted in P2. Cells were washed twice and
single SARS-CoV-2 RBD-specific PBs (live singlet CD19+CD4 IgDlo Fas+ CD38loCD138+ RBD+) and total PBs (live singlet
CD19+ CD4 IgDlo Fas+CD38lo CD138+) were sorted using a FACSAria II into
96-well plates containing 2 μL Lysis Buffer (Clontech) supplemented with
1 U/μL RNase inhibitor (NEB) and immediately frozen on dry ice or bulk
sorted into PBS supplemented with 0.05% BSA and processed for single cell
RNAseq.
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