Malaria parasiteP. yoelii
Genetic modification not successful
DisruptedGene model (rodent): PY17X_1311400; Gene model (P.falciparum): PF3D7_1443700; Gene product: dephospho-CoA kinase, putative (DPCK)
PhenotypeNo phenotype has been described
Last modified: 8 July 2017, 18:42
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) : 28676844
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/ResearcherHart RJ; Aly ASI
Name Group/DepartmentDepartment of Tropical Medicine
Name InstituteTulane University
CityNew Orleans

  Disrupted: Mutant parasite with a disrupted gene
Details of the target gene
Gene Model of Rodent Parasite PY17X_1311400
Gene Model P. falciparum ortholog PF3D7_1443700
Gene productdephospho-CoA kinase, putative
Gene product: Alternative nameDPCK
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
Promoter of the selectable markereef1a
Selection (positive) procedurepyrimethamine
Selection (negative) procedureNo
Additional remarks genetic modificationThe unsuccessful attempts to disrupt this gene indicate an essential function during asexual blood stage development/multiplication.

CoA is an essential cofactor for all prokaryotes and eukaryotes to support a large number of metabolic processes including fatty acid biosynthesis and oxidation, as well as carbohydrate and amino acid metabolism. In many living cells, the transport and utilization of pantothenic acid (vitamin B5, pantothenate in ionic form) is essential for CoA biosynthesis. The cellular machinery for the biosynthesis of CoA from exogenous pantothenate involves a putative pantothenate transporter (PAT) and five enzymes, PanK (Pantothenate Kinase), PPCS (Phosphopantothenylcysteine Synthase), PPCDC (Phosphopantothenylcysteine Decarboxylase), PPAT (Phosphopantetheine Adenylyltransferase), and DPCK (Dephospho-CoA Kinase).
Previous studies showed that PAT, PanK1, and PanK2 genes are dispensable for blood stage development in mice but are crucial for oocyst development and sporozoite formation in the mosquito.
In this study the following was shown: 'The intermediate enzymes PPCS (Phosphopantothenylcysteine Synthase), PPCDC (Phosphopantothenylcysteine Decarboxylase; RMgm-4183) were shown to be dispensable for asexual and sexual blood stage development, but they were essential for oocyst development and the production of sporozoites. However, the last two enzymes of this pathway, PPAT (Phosphopantetheine Adenylyltransferase; RMgm-4184) and DPCK (Dephospho-CoA Kinase; RMgm-4185), were essential for blood stage development. These results indicate alternative first substrate requirement for the malaria parasite, other than the canonical pantothenate, for the synthesis of CoA in the blood but not inside the mosquito midgut. Collectively, these studies indicate that CoA de novo biosynthesis is essential for both blood and mosquito stages'.
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