Summary

RMgm-157
Malaria parasiteP. berghei
Genotype
TaggedGene model (rodent): PBANKA_1212600; Gene model (P.falciparum): PF3D7_1014200; Gene product: male gamete fusion factor HAP2, putative (HAP2; GCS1, Generative Cell Specific 1)
Name tag: AGFP (Azami GFP)
Phenotype Gametocyte/Gamete;
Last modified: 28 January 2011, 14:05
  *RMgm-157
Successful modificationThe parasite was generated by the genetic modification
The mutant contains the following genetic modification(s) Gene tagging
Reference (PubMed-PMID number) Reference 1 (PMID number) : 18403203
MR4 number
Parent parasite used to introduce the genetic modification
Rodent Malaria ParasiteP. berghei
Parent strain/lineP. berghei ANKA
Name parent line/clone P. berghei ANKA 2.34
Other information parent lineP. berghei ANKA 2.34 is a cloned, gametocyte producer line of the ANKA strain (PubMed: PMID: 15137943).
The mutant parasite was generated by
Name PI/ResearcherM. Hirai; H. Matsuoka
Name Group/DepartmentDivision of Medical Zoology, Department of Infection and Immunity
Name InstituteJichi Medical University School of Medicine
CityShimotsuke City
CountryJapan
Name of the mutant parasite
RMgm numberRMgm-157
Principal namegcs1::agfp
Alternative name
Standardized name
Is the mutant parasite cloned after genetic modificationYes
Phenotype
Asexual blood stageNot different from wild type
Gametocyte/GameteNo GFP expression in asexual blood stages and female gametocytes and gametes. Only male gametocytes and male gametes are GFP-positive.
Fertilization and ookineteNot different from wild type
OocystNot different from wild type
SporozoiteNot different from wild type
Liver stageNot tested
Additional remarks phenotype

Mutant/mutation
The mutant expresses a GFP-tagged form of GCS1 (Generative Cell Specific 1; HAP2). The gcs1-agfp gene is under the regulation of the endogenous gcs1 gene promoter

Protein (function)
In Arabidopsis the male-specific sterility protein HAP2 has been identified by a genetic screen (HAP mutants: containing haploid-disrupting (hapless) mutations; Johnson M.A. et al., 2004, Genetics 168, 971-82) . A HAP2 family member called GCS1 (for generative cell-specific) was subsequently identified in a screen for lily genes whose transcripts were up-regulated in sperm (generative cells) . GCS1/HAP2 is conserved and members were found in rice, Chlamydomonas, a red alga, a slime mold, Plasmodium falciparum, and Leishmania major. Phenotype analyses of mutants lacking expression of GCS1/HAP2  (RMgm-155, RMgm-156) indicate a role of GCS1/HAP2 in fertilisation. Female gametes are fertile, whereas male gametes are sterile. Male gametes are able to attach to female gametes and form tight prefusion membrane attachments but the membranes of the gametes do not merge or fuse.

Phenotype
The phenotype analyses indicate specific expression of GCS1 in male gametocytes and male gametes. See also mutant RMgm-158 which expresses GFP under the control of the GCS1 promoter region. Analysis of this mutant indicates the lack of expression in ookinetes.
Phenotype analyses of mutants lacking expression of GCS1/HAP2  (RMgm-155, RMgm-156) indicate a role of GCS1/HAP2 in fertilisation. Female gametes are fertile, whereas male gametes are sterile. Male gametes are able to attach to female gametes and form tight prefusion membrane attachments but the membranes of the gametes do not merge or fuse.

Additional information
GenBank accession no. XM_671808.

Other mutants
RMgm-155: An independent mutant lacking expression of HAP2/GCS1.
RMgm-156: A mutant lacking expression of HAP2/GCS1.
RMgm-167: A mutant expressing a GFP-tagged form of HAP2/GCS1
RMgm-158: A mutant expressing GFP under the control of the hap2/gcs1 promoter
RMgm-605: A mutant expressing a mutated form of HAP2/GCS1 lacking the HAP2-GCS1 (HG) domain
RMgm-606: A mutant expressing a mutated form of HAP2/GCS1 lacking the entire C-terminal region downstream from the TM domain
RMgm-607: A mutant expressing a mutated form of HAP2/GCS1 lacking the TM domain and the entire C-terminal region downstream from the TM domain


  Tagged: Mutant parasite with a tagged gene
Details of the target gene
Gene Model of Rodent Parasite PBANKA_1212600
Gene Model P. falciparum ortholog PF3D7_1014200
Gene productmale gamete fusion factor HAP2, putative
Gene product: Alternative nameHAP2; GCS1, Generative Cell Specific 1
Details of the genetic modification
Name of the tagAGFP (Azami GFP)
Details of taggingC-terminal
Additional remarks: tagging
Commercial source of tag-antibodiesAnti-AGFP (MBL)
Type of plasmid/constructPlasmid single cross-over
PlasmoGEM (Sanger) construct/vector usedNo
Modified PlasmoGEM construct/vector usedNo
Plasmid/construct map
Plasmid/construct sequence
Restriction sites to linearize plasmid EcoRI
Selectable marker used to select the mutant parasitetgdhfr
Promoter of the selectable markerpbdhfr
Selection (positive) procedurepyrimethamine
Selection (negative) procedureNo
Additional remarks genetic modificationSee supplemental data for construction of the plamsid used in generating parasites expressing AGFP-tagged GCS1 (Hirai et.al., Current Biology (2008) 18:1-7).
The Azami Green Fluorescent Protein (AGFP) cDNA was amplified from CoralHue monomeric Azami-Green (pmAG1-S1) plasmid (MBL). The gcs1-agfp gene is under the regulation of the endogenous gcs1 gene promoter
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