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Toxoplasma gondii: Simple duplex RT-PCR assay for detecting SAG1 and BAG1 genes during stage conversion in immunosuppressed mice
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- Author(s): Mahittikorn, Aongart1; Wickert, Hannes2,3; Sukthana, Yaowalark1,4
- Source:
Experimental Parasitology. Feb2010, Vol. 124 Issue 2, p225-231. 7p.- Subject Terms:
- Source:
- Additional Information
- Abstract: Abstract: Toxoplasmic encephalitis (TE) is caused by reactivation of dormant bradyzoites into rapidly dividing tachyzoites of the apicomplexan parasite Toxoplasma gondii in immune-compromised hosts. Diagnosis of this life-threatening disease is complicated, since it is difficult to distinguish between these two stages. It is, therefore, mainly based on a test positive for T. gondii antibodies, and specific clinical symptoms. We developed a duplex RT-PCR to detect the expression of bradyzoite (BAG1) and tachyzoite (SAG1) specific genes simultaneously during tachyzoite/bradyzoite stage conversion. The conversion reaction was observed in many organs of experimental mice, indicated by tachyzoites in the cerebrum, cerebellum, heart and lung, beginning in week 1 after the suppression period, and continuing until the end. Bradyzoites were also detected in nearly all organs throughout the study, suggesting that during the reactivation period, bradyzoites not only escape from cysts and reinvade neighboring cells as tachyzoites, but are also driven into developing new bradyzoites. The results of our study show that duplex RT-PCR is an easy, rapid, sensitive, and reproducible method, which is particularly valuable when numerous samples must be analyzed. This technique may usefully serve as an alternate tool for diagnosing TE in severely immunocompromised patients. [Copyright &y& Elsevier]
- Abstract: Copyright of Experimental Parasitology is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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