Tissue‐Specific Regulation of Oncogene Expression Using Cre‐Inducible ROSA26 Knock‐In Transgenic Mice

Brandi L. Carofino1, Monica J. Justice2

1 Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, 2 Genetics and Genome Biology, The Hospital for Sick Children, Toronto, Ontario
Publication Name:  Current Protocols in Mouse Biology
Unit Number:   
DOI:  10.1002/9780470942390.mo140150
Online Posting Date:  June, 2015
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Cre‐inducible mouse models are often utilized for the spatial and temporal expression of oncogenes. With the wide number of Cre recombinase lines available, inducible transgenesis represents a tractable approach to achieve discrete oncogene expression. Here, we describe a protocol for targeting Cre‐inducible genes to the ubiquitously expressed ROSA26 locus. Gene targeting provides several advantages over standard transgenic techniques, including a known site of integration and previously characterized pattern of expression. Historically, an inherent instability of ROSA26 targeting vectors has hampered the efficiency of developing ROSA26 knock‐in lines. In this protocol, we provide individual steps for utilizing Gateway recombination for cloning as well as detailed instructions for screening targeted ES cell clones. By following this protocol, one can achieve germline transmission of a ROSA26 knock‐in line within several months. © 2015 by John Wiley & Sons, Inc.

Keywords: ROSA26; oncogene; Cre‐inducible; Gateway; In‐Fusion; Southern blotting; JM8A3 ES cells

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Table of Contents

  • Introduction
  • Basic Protocol 1: Design and Cloning of ROSA26 Targeting Vectors
  • Basic Protocol 2: Screening for Successful Targeting of the ROSA26 Locus
  • Reagents and Solutions
  • Commentary
  • Figures
  • Tables
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Basic Protocol 1: Design and Cloning of ROSA26 Targeting Vectors

  • Gateway pENTR vector (Life Technologies)
  • One Shot ccdB Survival 2 T1R Competent Cells (Life Technologies, cat. no. A10460)
  • Construct containing gene of interest
  • AmpliTaq Gold 360 Master Mix (Life Technologies, cat. no. 4398881)
  • Appropriate restriction enzymes
  • 1% TBE agarose gel with 0.5 μg/ml ethidium bromide (also see Voytas, )
  • QIAquick Gel Extraction Kit (Qiagen, cat. no. 28704)
  • In‐Fusion HD Cloning Plus Kit (Clontech, cat. no. 638909)
  • pRosa26‐DEST vector (Addgene, plasmid 21189)
  • LB broth (see recipe)
  • Ampicillin
  • Gateway LR Clonase II Enzyme Mix (Life Technologies, cat. no. 11791‐100)
  • TE buffer: 10 mM Tris·Cl, pH 8.0/1 mM EDTA
  • SURE2 Supercompetent Cells (Agilent Technologies, cat. no. 200152)
  • LB agar plates: prepare LB broth (see recipe) containing 15 g/liter agar
  • EndoFree Plasmid Maxi Kit (Qiagen, cat. no. 12362)
  • 0.7% TBE agarose gel with 0.5 μg/ml ethidium bromide (also see Voytas, )
  • 0.5 M disodium EDTA, pH 8.0
  • Phenol:chloroform:isoamyl alcohol (25:24:1)
  • Chloroform
  • 3 M sodium acetate, pH 5.2
  • 70% and 100% ethanol
  • 37°C shaking bacterial incubator
  • Spectrophotometer
  • 30°C shaking bacterial incubator
  • Additional reagents and equipment for PCR (Kramer and Coen, ), agarose gel electrophoresis (Voytas, ), determining DNA concentration by spectrophotometry (Gallagher, ), and DNA minipreps (Engebrecht et al., ) or maxipreps (Heilig et al., )

Basic Protocol 2: Screening for Successful Targeting of the ROSA26 Locus

  • ROSA26‐targeted ES cell clones, grown to confluency in 96‐well plate
  • Phosphate‐buffered saline (PBS; Life Technologies, cat. no. 10010‐023)
  • 70% ethanol
  • Nuclease‐free H 2O
  • Apex Hot Start 2× Master Mix, Blue (Genesee Scientific, cat. no. 42‐148)
  • Oligonucleotide primers (Table 14.1.5000)
  • 1% and 0.8% TBE agarose gels with 0.5 μg/ml ethidium bromide (Voytas, )
  • Southern restriction enzyme cocktail (see recipe)
  • 6× DNA loading dye (see recipe)
  • Denaturing solution (see recipe)
  • Neutralizing solution (see recipe)
  • TrackIt λ DNA/Hind III fragments (Life Technologies, cat. no. 10488‐064)
  • 10× and 2× SSC (see recipe for 20×)
  • 0.1× SSC (see recipe for 20×)/1% (w/v) SDS
  • Church‐Gilbert hybridization solution (see recipe)
  • Oligonucleotide probes (see Critical Parameters)
  • AmpliTaq Gold 360 Master Mix (Life Technologies, cat. no. 4398881)
  • QIAquick PCR Purification Kit (Qiagen, cat. no. 28104)
  • Prime‐It II Random Primer Labeling Kit (Agilent Technologies, cat. no. 300385)
  • [α‐32P]dATP
  • Sonicated salmon sperm DNA (Life Technologies, cat. no. 15632‐011)
  • 55°C incubator
  • Humidified chamber (sealed plastic container containing moistened paper towels)
  • Spectrophotometer
  • Camera
  • Fluorescent ruler
  • Cross‐linking apparatus (e.g., Stratagene UV Stratalinker 2400)
  • UV light box
  • Non‐reactive glass dish (9 × 13–in. for a large gel)
  • Orbital shaker
  • Nylon membrane, Hybond XL (GE Healthcare cat. no. RPN303S)
  • Upward capillary transfer apparatus (see Brown, , and description under step 17)
  • Whatman 3MM filter paper
  • Hybridization tubes
  • 65°C hybridization oven
  • Illustra ProbeQuant G50 Micro Columns (GE Healthcare, cat. no. 28‐9034‐08)
  • Geiger counter
  • Plastic sheet protectors
  • Film cassette with intensifying screens or phosphor imager
  • Autoradiography film
  • Aluminum foil
  • Film developer
  • Additional reagents and equipment for determining DNA concentration by spectrophotometry (Gallagher, ), PCR (Kramer and Coen, ), and agarose gel electrophoresis (Voytas, )
Table 4.1.1   MaterialsPrimer List for ROSA26 PCR and Southern Blotting

Primer Sequence (5′‐3′)

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Internet Resources
  Selection guide and manual for choosing Gateway pENTR vectors.
  Tool for converting PCR primers into In‐Fusion primers.
  Listing of gene‐trapped ROSA26 alleles.
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