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Document 0146
DOCN M9470146
TI [Inter- and intra-cephalic variations in pathogenicity in Toxoplasma
gondii. Clinical and epidemiologic consequences]
DT 9409
AU Ambroise-Thomas P; Okay T; Departement de Parasitologie-Mycologie
Medicale et; Moleculaire, Faculte de Medecine, Universite Joseph
Fourier,; Grenoble.
SO Bull Acad Natl Med. 1993 Nov;177(8):1411-9; discussion 1419-21. Unique
Identifier : AIDSLINE MED/94251636
AB Clinical and epidemiological studies, especially the ones conducted in
HIV+ patients indicate that the pathogenicity of Toxoplasma gondii
varies according to the strain considered. The differences observed
among strains are represented by distinct genomic DNA patterns which
could be experimentally evaluated by means of the RFLP (Restriction
Fragment Length Polymorphism) and the RAPD (Random Amplified Polymorphic
DNA). If on the one hand virulent strains present very similar genomic
DNA patterns, on the other hand chronic strains are highly polymorphic.
These differences may be, at least in part, due to the asexual (clonal)
multiplication of virulent strains. The existence of an intraspecific
pathogenicity variation and genetic heterogeneity was observed within a
single strain either after attenuation (infection in Fischer or Wistar
rats), or during reactivation (in immunodepressed animals). In a
congenital model of toxoplasmosis, the differences are detected from one
animal to another and sometimes, even from one organ to another in the
same host. This finding do not seem to be related to the occurrence of
mutations but rather to selective pressures, notably of immunological
origin, exerted by the infected organism. A better understanding of
these phenomena could result in significant therapeutic and prophylactic
advances. Our first effort will be directed to the establishment of more
precise diagnostic and predictive elements. The accomplishment of this
step relies on the use of primers deriving from DNA sequences
characteristic of virulence and which will be tested by PCR.
DE Animal English Abstract Human Rats Rats, Inbred F344 Rats, Wistar
Toxoplasma/*PATHOGENICITY Toxoplasmosis/*EPIDEMIOLOGY/THERAPY
Toxoplasmosis, Animal/*CONGENITAL JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).