Genetic variability of Brazilian Toxoplasma gondii strains detected by random amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR) and simple sequence repeat anchored-PCR (SSR-PCR)

被引：46

作者：

Ferreira, Adriana de Melo ^{[1
]}

Vitor, Ricardo Wagner A. ^{[1
]}

Carneiro, Ana Carolina A. V. ^{[1
]}

Brandao, Geane Peroni ^{[1
]}

Melo, Maria Norma ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, Inst Ciencias Biol, Dept Parasitol, BR-31270901 Belo Horizonte, MG, Brazil

来源：

INFECTION GENETICS AND EVOLUTION | 2004年 / 4卷 / 02期

关键词：

Toxoplasma gondii; Strains; Brazil; Genetic variability; RAPD-PCR; SSR-PCR;

D O I：

10.1016/j.meegid.2004.03.002

中图分类号：

R51 [传染病];

学科分类号：

100401 ;

摘要：

The genetic variability of 19 Toxoplasma gondii strains isolated from humans and animals in Brazil was detected by both random amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR) and simple sequence repeat anchored-PCR (SSR-PCR) for the first time. Two reference strains, RH (highly virulent) and ME49 (avirulent), were submitted to both assays. Besnoitia sp., Plasmodium falciparum and Babesia bigemina were used as outgroups. RAPD-PCR and SSR-PCR profiles were used for building phenetic trees by unweighted pair group method with arithmetic averages (UPGMA). Phenograms built with TREECONW software showed great similarity in the topology of the trees. Both phenograms presented two major clusters that grouped T. gondii strains according to their murine virulence. The strains AS28, BV and N, which are highly virulent for BALB/c mice, were clustered with the reference strain RH, the highly virulent strain of T. gondii that has been most commonly studied. The group formed by the cystogenic strains showed that the strains which presented a level of virulence more similar to that of ME49 strain (avirulent) also presented a closer genetic relationship. Genetic variation within each lineage was significantly lower (P < 0.05) than that between the lineages. Regarding outgroups, Besnoitia sp. presented the closest relationship to T. gondii while P. falciparum was the most distant. The results presented here demonstrate that intraspecific genetic variability separates Brazilian T. gondii strains into two groups which correlate with murine virulence phenotype. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：131 / 142

页数：12

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