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7 protocols using pbabe puro hras v12

1

Plasmids for Cell Engineering

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The plasmids pBabe-puro (Addgene # 1764) were a gift from Hartmut Land and Jay Morgenstern, pBabe-puro HRAS V12 (Addgene # 39526), were a gift from Julian Downward and HRAS V12 (Addgene # 9051) was a gift from William Hahn, pbabe - KRAS G12D (Addgene # 58902) was a gift from Channing Der pBabe-puro HRAS V12 S35 (Addgene # 18746) was a gift from Jay Morgenstern, pBabe-puro HRAS V12 C40 (Addgene # 18747) and pBabe-puro HRAS V12 G37 (Addgene # 18745) was a gift from Scott Lowe S100A10 siRNA was purchased as a pre-designed sequence from Ambion (4392420). The pKRAS-gRNA1-px459-V2 plasmid was made by cloning the annealed oligos: 5′- CAC CGA ATA TAA ACT TGT GGT AGT-3′ and 5′-AAA CAC TAC CAC AAG TTT ATA TTC-3′ into px459-V2 from Addgene (62988) and the pKRAS-gRNA2-px459-V2 was made by cloning the annealed oligos: 5′-CAC CGA AAC TTG TGG TAG TTG GAG C-3′ and 5′-AAA CGC TCC AAC TAC CAC AAG TTT C-3′ into px459-V2 from Addgene. The pGL4.22- S100A10-promoter luciferase reporter plasmid was constructed by cutting the S100A10-promoter from the pCAT-S100A10-promoter plasmid and cloning it into the Kpn I/Sac I restriction sites of pGL4.22 vector (Promega).
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2

Transfection and Viral Concentration

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293GPG cells were transfected with the pBABE puro H-RasV12 (Addgene, Plasmid #9051) viral vector. Viral suspensions were collected at five time points (at 2-day intervals). After the final collection, the viral suspension was filtered through a 0.45-μm filter and concentrated using the Retro-X concentrator system (Thermo Fisher Scientific). The concentrated virus was suspended in TNE buffer (50 mM Tris, 130 mM NaCl, and 1 mM ethylenediaminetetraacetic acid).
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3

Ras and Cyclin E Overexpression Protocols

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pBABE-Puro H-RasV12 (n°12545 Addgene) or Cyclin E and corresponding empty vectors were used to infect either BJ hTERT cells or U2OS, respectively. Lentiviruses were produced by the vectorology facility (BioCampus Montpellier) according to standard protocols76 (link). Plasmid transfection in BJ-Rasv12 cells was performed using Viromer Yellow (Lipocalix) according to the manufacturer’s instructions. U2OS-CycE transfections were performed using Interferin (Polyplus-transfection, Illkirch, France) according to the manufacturer’s instructions. As a control, pMax-GFP plasmid (Lonza) was used and to overexpressed Claspin and Timeless pcDNA3.1-Flag-claspin (Addgene no. 12659) and pcDNA 4-Flag-Timeless (Addgene no. 22887) plasmids were used.
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4

Melanoma Cell Lines Characterization

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SKMEL-2, SKMEL-28, MeWo, and A375 cells were purchased from American Type Culture Collection (ATCC) and grown as recommended. Neonatal primary human melanocytes were purchased from Life Technologies and grown as recommended by the supplier. All short-term melanoma cultures (YUGASP, YUHEF, YUTOGS, and YUVON) were obtained from the Yale SPORE in Skin Cancer, Yale University, and grown as recommended. SKMEL-103 and M318 cells were provided by Dr. Keiran Smally (Moffitt Cancer Center, Florida). MEL-ST cells were provided by Prof. Robert Weinberg (Whitehead Institute, MIT). All the cell lines were authenticated using STR analysis and tested for mycoplasma regularly using a MycoAlert Mycoplasma detection kit (Lonza, Allendale, NJ). Human IFI6 open reading frame was cloned in pcDNA3.1/hygro and used for rescue experiments. The plasmids pBabe puro-HRAS V12 (plasmid #15269), pBabe puro-HRAS V12 S35 (plasmid# 12274), pBabe puro-MEK-DD (plasmid #15268), and pBabe-puro-BRAFV600E (plasmid #15269) were purchased from Addgene. FG12 was a kind gift of Prof. David Baltimore, and FG12/NRASQ61K was a kind gift of Maria Soengas (CNIO, Spain).
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5

Establishing Cell Lines with Oncogenic Ras Mutations

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To establish cell lines expressing HRasG12V and KRasG12V, GP2-293 packaging cells were co-transfected with pVSV-G (#631530: Clontech, Mountain View, CA, USA) along with either pBABE-puro, pBABE puro H-Ras V12, or pBABE puro K-Ras V12 (#9051, #9052, or #1764: Addgene) using a CalPhos™ Mammalian Transfection Kit (#631312, Clontech) following the manufacturer’s instructions. Retroviral supernatants were used to transduce MCF10A cells in the presence of polybrene (5 mg/mL; Millipore, Burlington, MA, USA). Transduced cells were selected with puromycin (Invivogen, San Diego, CA, USA) for 3 weeks. Selected single cells were isolated, and the expression of HRasG12V and KRasG12V was confirmed by Western blotting.
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6

Plasmid Sources for Cell Transformation

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The following plasmids were purchased from AddGene: pWZL hygro H-RasV12 (#18749), pBabe-puro H-RasV12 (#1768), pWZL hygro 12S E1A(#18748), and MSCV-puro-IRES-GFP (#21654). pWZL hygro SV40T-large was a kind gift from Pier Paolo Pandolfi, and 12SLRC H-RasV12/E1A was a kind gift from Marisol Soengas. The MSCV-PIG-FLAG-Inpp4b was cloned by adding FLAG-Inpp4b to the MSCV-puro-IRES-GFP plasmid through Gibson Assembly (NEB).
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7

Oncogenic Ras-Driven Transformation Assays

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For monolayer colony-formation assay, 1000 BALB/c fibroblasts were transduced with pCCL-CCR492 and H-RasV12 (Addgene Plasmid 9051: pBABEpuro H-RasV12) expression vectors and plated in 100 mm 2 plates and allowed to grow in appropriate culture medium for 10 days. Fresh media were supplied every 3 days. Colonies were stained with crystal violet dye after formaldehyde fixation.
Sft agar colony-formation assays, 3 x 10 4 cells/ml were transduced in the same conditions and seeded on top of a solidified layer in a volume of 2 ml of 0.5% Bacto Agar (Sigma-Aldrich) over 2 ml 0.4% agar base layers in each six-well plate as previously described [17] (link).
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