RMgmDB - Rodent Malaria genetically modified Parasites

Summary

RMgm-5135
Malaria parasiteP. berghei
Genotype
DisruptedGene model (rodent): PBANKA_1107600; Gene model (P.falciparum): PF3D7_0612800; Gene product: 6-cysteine protein (P38, Pf38)
Transgene
 Transgene not Plasmodium: GFP
Promoter: Gene model: PBANKA_0711900; Gene model (P.falciparum): PF3D7_0818900; Gene product: heat shock protein 70 (HSP70)
3'UTR: Gene model: PBANKA_0719300; Gene product: bifunctional dihydrofolate reductase-thymidylate synthase, putative (dhfr/ts)
Replacement locus: Gene model: PBANKA_1107600; Gene product: 6-cysteine protein (P38, Pf38)
Phenotype Liver stage;
Last modified: 6 January 2022, 16:18
  *RMgm-5135
Successful modificationThe parasite was generated by the genetic modification
The mutant contains the following genetic modification(s) Gene disruption, Introduction of a transgene
Reference (PubMed-PMID number) Not published (yet)
MR4 number
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Parent parasite used to introduce the genetic modification
Rodent Malaria ParasiteP. berghei
Parent strain/lineP. berghei ANKA
Name parent line/clone P. berghei ANKA cl15cy1
Other information parent lineA reference wild type clone from the ANKA strain of P. berghei (PubMed: PMID: 17406255).
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The mutant parasite was generated by
Name PI/ResearcherFernandes P, Silvie O
Name Group/DepartmentSorbonne Université, INSERM, CNRS, Centre d’Immunologie et des Maladies Infectieuses
Name InstituteCIMI-Paris
CityParis
CountryFrance
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Name of the mutant parasite
RMgm numberRMgm-5135
Principal namePbΔ38
Alternative name
Standardized name
Is the mutant parasite cloned after genetic modificationYes
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Phenotype
Asexual blood stageNot tested
Gametocyte/GameteNot tested
Fertilization and ookineteNot tested
OocystNot tested
SporozoiteNot different from wild type
Liver stageC57BL/6 mice injected with 10,000 PbΔ38 sporozoites all developed a patent blood-stage infection, like the parental PbGFP parasites.
Additional remarks phenotype

Mutant/mutation
The mutant lacks expression of P38 and expresses GFP under the control of the HSP70 promoter.  The parasites have been generated and selected using the GOMO method of transfection (see RMgm-1026 for more details for this transfection method and the construct used)

Published in: bioRxiv preprint doi: https://doi.org/10.1101/2021.10.25.465731

Protein (function)
P38 belongs to the small gene family encoding 6-cys proteins. The proteins are characterized by domains of roughly 120 amino acids in size that contain six positionally conserved cysteines (6-cys) 

Phenotype
Normal/wild-type numbers of sporozoites.
C57BL/6 mice injected with 10,000 PbΔ38 sporozoites all developed a patent blood-stage infection, like the parental PbGFP parasites.

Additional information
The parasites are selected by a combination of positive selection (pyrimethamine), negative selection (5-FC) and FACS sorting (GOMO transfection; 'Gene Out Marker Out'; see mutant RMgm-1026 for more details for this transfection method and the construct used).

Other mutants

  Disrupted: Mutant parasite with a disrupted gene
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Details of the target gene
Gene Model of Rodent Parasite PBANKA_1107600
Gene Model P. falciparum ortholog PF3D7_0612800
Gene product6-cysteine protein
Gene product: Alternative nameP38, Pf38
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Details of the genetic modification
Inducable system usedNo
Additional remarks inducable system
Type of plasmid/construct used(Linear) plasmid double cross-over
PlasmoGEM (Sanger) construct/vector usedNo
Modified PlasmoGEM construct/vector usedNo
Plasmid/construct map
Plasmid/construct sequence
Restriction sites to linearize plasmid
Partial or complete disruption of the geneComplete
Additional remarks partial/complete disruption
Selectable marker used to select the mutant parasitehdhfr/yfcu
Promoter of the selectable markereef1a
Selection (positive) procedurepyrimethamine
Selection (negative) procedure5-fluorocytosine (5-FC)
Additional remarks genetic modificationThe parasites have been generated and selected using the GOMO method of transfection (see RMgm-1026 for more details for this transfection method).
For each target gene, a 5’ fragment and a 3’ fragment were amplified by PCR from P. berghei (ANKA) or P. yoelii (17XNL) WT genomic DNA and inserted into SacII/NotI and XhoI/KpnI restriction sites, respectively, of the GOMO-GFP vector, using the In-Fusion HD Cloning Kit (Clontech). The resulting targeting constructs were linearized with SacII and KpnI before transfection.
Additional remarks selection procedureThe parasites are selected by a combination of positive selection (pyrimethamine), negative selection (5-FC) and FACS sorting.
1) Transfected parasites are first selected in a mouse by pyrimethamine treatment
2) GFP+mCherry+ parasites are selected by FACS sorting and used to infect a mice
3) This mouse is treated with 5-FC to select for parasites that have the selectable marker removed
4) GFP+mCherry- and marker-free parasites are selected by FAC sorting and used to infect a mouse
Primer information: Primers used for amplification of the target sequences  Click to view information
Primer information: Primers used for amplification of the target sequences  Click to hide information
Sequence Primer 1
Additional information primer 1
Sequence Primer 2
Additional information primer 2
Sequence Primer 3
Additional information primer 3
Sequence Primer 4
Additional information primer 4
Sequence Primer 5
Additional information primer 5
Sequence Primer 6
Additional information primer 6
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  Transgene: Mutant parasite expressing a transgene
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Type and details of transgene
Is the transgene Plasmodium derived Transgene: not Plasmodium
Transgene nameGFP
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Details of the genetic modification
Inducable system usedNo
Additional remarks inducable system
Type of plasmid/construct(Linear) plasmid double cross-over
PlasmoGEM (Sanger) construct/vector usedNo
Modified PlasmoGEM construct/vector usedNo
Plasmid/construct map
Plasmid/construct sequence
Restriction sites to linearize plasmid
Selectable marker used to select the mutant parasitehdhfr/yfcu
Promoter of the selectable markereef1a
Selection (positive) procedurepyrimethamine
Selection (negative) procedure5-fluorocytosine (5-FC)
Additional remarks genetic modification
Additional remarks selection procedureThe parasites are selected by a combination of positive selection (pyrimethamine), negative selection (5-FC) and FACS sorting.
1) Transfected parasites are first selected in a mouse by pyrimethamine treatment
2) GFP+mCherry+ parasites are selected by FACS sorting and used to infect a mice
3) This mouse is treated with 5-FC to select for parasites that have the selectable marker removed
4) GFP+mCherry- and marker free parasites are selected by FAC sorting and used to infect a mouse
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Other details transgene
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Promoter
Gene Model of Parasite PBANKA_0711900
Gene Model P. falciparum ortholog PF3D7_0818900
Gene productheat shock protein 70
Gene product: Alternative nameHSP70
Primer information details of the primers used for amplification of the promoter sequence  Click to view information
Primer information details of the primers used for amplification of the promoter sequence  Click to hide information
Sequence Primer 1
Additional information primer 1
Sequence Primer 2
Additional information primer 2
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3'-UTR
Gene Model of Parasite PBANKA_0719300
Gene productbifunctional dihydrofolate reductase-thymidylate synthase, putative
Gene product: Alternative namedhfr/ts
Primer information details of the primers used for amplification the 3'-UTR sequences  Click to view information
Primer information details of the primers used for amplification the 3'-UTR sequences  Click to hide information
Sequence Primer 1
Additional information primer 1
Sequence Primer 2
Additional information primer 2
Insertion/Replacement locus
Replacement / InsertionReplacement locus
Gene Model of Parasite PBANKA_1107600
Gene product6-cysteine protein
Gene product: Alternative nameP38, Pf38
Primer information details of the primers used for amplification of the target sequences  Click to view information
Primer information details of the primers used for amplification of the target sequences  Click to hide information
Sequence Primer 1
Additional information primer 1
Sequence Primer 2
Additional information primer 2
Sequence Primer 3
Additional information primer 3
Sequence Primer 4
Additional information primer 4
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P.berghei model of malaria
Technical design and realization: S. Mededovic and A. van Wigcheren