RMgmDB - Rodent Malaria genetically modified Parasites


Malaria parasiteP. yoelii
Genetic modification not successful
DisruptedGene model (rodent): PY17X_0109900; Gene model (P.falciparum): PF3D7_0609800; Gene product: palmitoyltransferase DHHC2, putative (DHHC2)
PhenotypeNo phenotype has been described
Last modified: 30 October 2020, 13:30
Successful modificationThe gene/parasite could not be changed/generated by the genetic modification.
The following genetic modifications were attempted Gene disruption
Number of attempts to introduce the genetic modification Unknown
Reference (PubMed-PMID number) Reference 1 (PMID number) : 32395856
Parent parasite used to introduce the genetic modification
Rodent Malaria ParasiteP. yoelii
Parent strain/lineP. y. yoelii 17XNL
Name parent line/clone Not applicable
Other information parent line
Attempts to generate the mutant parasite were performed by
Name PI/ResearcherWang X, Yuan J
Name Group/DepartmentState Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signal Network
Name InstituteSchool of Life Sciences, Xiamen University

  Disrupted: Mutant parasite with a disrupted gene
Details of the target gene
Gene Model of Rodent Parasite PY17X_0109900
Gene Model P. falciparum ortholog PF3D7_0609800
Gene productpalmitoyltransferase DHHC2, putative
Gene product: Alternative nameDHHC2
Details of the genetic modification
Inducable system usedNo
Additional remarks inducable system
Type of plasmid/construct usedCRISPR/Cas9 construct: integration through double strand break repair
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) procedureNo
Additional remarks genetic modificationThe multiple negative attempts to disrupt the dhhc2 gene indicates an essential role in blood stage growth/multiplication.

CRISPR/Cas9 plasmid pYCm was used for parasite genomic modification. To construct plasmid vectors for gene editing, we amplified 50 and 30 genomic sequence (400–500 bp) of target genes as homologous arms using specific primers and inserted the sequences into specific restriction sites in pYCm. The sgRNAs were designed to target the coding region of a gene using the online program EuPaGDT. Oligonucleotides for guide RNAs (sgRNAs) were mixed in pairs, denatured at 95°C for 3 min, annealed at room temperature for 5 min, and ligated into pYCm. DNA fragments encoding 6HA, 4Myc, 3V5, and Flag tags or BFP were inserted between the left and right arms in frame with gene of interest. For each gene, two sgRNAs were designed to target sites close to the C- or N-terminal part of the coding region. Infected red blood cells (iRBCs) were electroporated with 5–10 lg plasmid DNA using Lonza Nucleofector described previously (Zhang et al, 2014). Transfected parasites were immediately intravenously injected into a naı¨ve mouse and were exposed to pyrimethamine (7 mg/ml) 24 h post-transfection. Parasites with transfected plasmids usually appear after 5–6 days under drug pressure. Some modified parasites subjected for sequential modification were negatively selected to remove pYCm plasmid.
Additional remarks selection procedure
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