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• W2015144477 abstract "We have recently characterised, in the virulent strain RH of Toxoplasma gondii, three glycosylphosphatidylinositol-anchored surface antigens related to SAG1 (p30) and encoded by highly homologous, tandemly arrayed genes named SAG5A, SAG5B and SAG5C. In the present study, we compared the genomic organisation of the SAG5 locus in strains belonging to the three major genotypes of T. gondii. Southern blot analysis using a SAG5-specific probe produced two related but distinct hybridisation patterns, one exclusive of genotype I virulent strains, the other shared by avirulent strains of either genotype II or genotype III. To understand the molecular bases of this intergenotypic heterogeneity, we cloned and sequenced the SAG5 locus in the genotype II strain Me49. We found that in this isolate the SAG5B gene is missing, with SAG5A and SAG5C laying contiguously. This genomic arrangement explains the hybridisation profiles observed for all the avirulent strains examined and indicates that the presence of SAG5B is a distinctive trait of genotype I. Furthermore, we identified two novel SAG1-related genes, SAG5D and SAG5E, mapping respectively 1.8 and 4.0 kb upstream of SAG5A. SAG5D is transcribed in tachyzoites and encodes a polypeptide of 362 amino acids sharing 50% identity with SAG5A-C, whereas SAG5E is a transcribed pseudogene. We also evaluated polymorphisms at the SAG5 locus by comparing the coding regions of SAG5A-E from strains representative of the three archetypal genotypes. In agreement with the strict allelic dimorphism of T. gondii, we identified two alleles for SAG5D, whereas SAG5A, SAG5C and SAG5E were found to be three distinct nucleotide variants. The higher intergenotypic polymorphism of SAG5A, SAG5C and SAG5E suggests that these genes underwent a more rapid genetic drift than the other members of the SAG1 family. Finally, we developed a new PCR-restriction fragment length polymorphism method based on the SAG5C gene that is able to discriminate between strains of genotype I, II and III by a single endonuclease digestion." @default.
• W2015144477 created "2016-06-24" @default.
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• W2015144477 date "2003-12-01" @default.
• W2015144477 modified "2023-09-27" @default.
• W2015144477 title "Analysis of the SAG5 locus reveals a distinct genomic organisation in virulent and avirulent strains of Toxoplasma gondii" @default.
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• W2015144477 doi "https://doi.org/10.1016/s0020-7519(03)00265-0" @default.
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