Toxoplasma gondii (ATCC® PRA-354)

Organism: Toxoplasma gondii  /  Depositor: LD Sibley

Permits and Restrictions

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Strain Designations TgCatPRC2
Biosafety Level 2
Isolation Cat, China, 2007
Product Format frozen
Storage Conditions Frozen: -70°C or colder
Freeze-Dried: 2°C to 8°C
Live Culture: See Protocols Section
Comments Type XIII haplogroup prototype strain
Reference strain for genome sequencing project
Medium ATCC® Medium 2222: Cell Cultivation Medium for Parasites
Growth Conditions Temperature: 35°C to 37°C
Atmosphere: 5% CO2
Cell Line: ATCC® CRL-1634™ (human foreskin fibroblast) (Contact ATCC Sales to order)
Cryopreservation Harvest and Preservation
  1. Harvest the culture by gently agitating the contents of each flask.  Transfer all but approximately 1 mL of the culture medium to 15 mL plastic centrifuge tubes. Detach the remaining tissue culture cells (infected and uninfected) by scraping the surface of the flask with a cell scraper. Pass the resulting cell suspension through a syringe equipped with a 27 gauge 1/2 in needle and pool this suspension with the culture fluid.
  2. Spin the cell suspensions at approximately 50 x g for 3 min, to remove the cellular debris.
  3. Transfer the cell suspensions (supernatants) to new 15 mL plastic centrifuge tubes.  Centrifuge at 1300 x g for 10 min.
  4. Pool the parasite pellets and adjust the concentration to 2.0 - 4.0 x 107 cells/mL with a fresh solution of Hank's Balanced Salt Solution. *If the concentration is too low, centrifuge at 1300 x g for 10 min and resuspend in the volume of Hank's Balanced Salt Solution required to yield the desired concentration.
  5. Mix the parasite preparation and 15% (v/v) DMSO in equal portions.  The final concentration will be 1.0 - 2.0 x 107 cells/mL and 7.5% DMSO.  The time from the mixing of the cell preparation and the cryoprotective solution before the freezing process begins should be no less than 15 min. and no more than 30 min.
  6. Dispense in 0.5 mL aliquots to 1.0-2.0 mL sterile plastic screw-capped cryules (special plastic vials for cryopreservation).
  7. Place the vials in a controlled rate freezing unit.  From room temperature, cool at -1°C/min to -40°C.  If the freezing unit can compensate for the heat of fusion, maintain rate at -1°C/min through the heat of fusion.  At -40°C plunge into liquid nitrogen. Alternatively, place the vials in a Nalgene 1°C freezing apparatus.  Place the apparatus at -80°C for 1.5 to 2 hours and then plunge ampules into liquid nitrogen.  (The cooling rate in this apparatus is approximately -1°C/min.)  
  8. Store in either the vapor or liquid phase of a nitrogen refrigerator.
  9. To thaw a frozen ampule, place it in a 35°C water bath such that the lip of the ampule remains above the water line. Thawing time is approximately 2 to 3 minutes.  Do not agitate the ampule.  Do not leave ampule in water bath after thawing.
  10. Immediately after thawing, aseptically transfer contents to a T-25 tissue culture flask containing a fresh monolayer of ATCC® CRL-1634™ cells and 10 mL ATCC® 30-2002 with 10% (v/v) HIFBS.
  11. Outgas the flask for 10 seconds with a 95% air, 5% CO2 gas mixture.
  12. Incubate in a 35-37°C CO2 incubator with the caps screwed on tightly.
Name of Depositor LD Sibley
Chain of Custody ATCC <-- LD Sibley
References

Dubey JP, et al. Genetic and biologic characterization of Toxoplasma gondii isolates of cats from China. Vet. Parasitol. 145(3-4): 352-356, 2007. PubMed: 17267132

Khan A, et al. A monomorphic haplotype of chromosome Ia is associated with widespread success in clonal and nonclonal populations of Toxoplasma gondii. MBio. 2: e00228-11, 2011. PubMed: 22068979

Notice: Necessary PermitsPermits

These permits may be required for shipping this product:

  • Customers located in the state of Hawaii will need to contact the Hawaii Department of Agriculture to determine if an Import Permit is required. A copy of the permit or documentation that a permit is not required must be sent to ATCC in advance of shipment.
Basic Documentation