| Summary: | The etiological agent of human amoebiasis is the protozoan parasite <i>E. histolytica</i>; the disease is still an endemic infection in some countries and the outcome of infection in the host infection can range from asymptomatic intestinal infection to intestinal or liver invasive forms of the disease. The invasive character of this parasite is multifactorial and mainly due to the differential expression of multiple pathogenic genes. The aim of the present work was to measure the differential expression of some genes in different specimens of patients with amoebic liver abscess (ALA) and specimens of genital amoebiasis (AG) by RT-qPCR. Results show that the expression of genes is different in both types of samples. Almost all studied genes were over expressed in both sets of patients; however, superoxide dismutase (<i>Ehsod</i>), serine threonine isoleucine rich protein (<i>Ehstirp</i>), peroxiredoxin (<i>Ehprd</i>) and heat shock protein 70 and 90 (<i>Ehhsp-70</i>, <i>EHhsp-90</i>) were higher in AG biopsies tissue. Furthermore, cysteine proteinases 5 and 2 (<i>Ehcp</i>5, <i>Ehcp</i>2), lectin (<i>Ehgal/galnaclectin</i>) and calreticulin (<i>Ehcrt)</i> genes directly associate with pathogenic mechanisms of <i>E. histolytica</i> had similar over expression in both AG and ALA samples. In summary the results obtained show that trophozoites can regulate the expression of their genes depending on stimuli or environmental conditions, in order to regulate their pathogenicity and ensure their survival in the host.
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