ABSTRACT 

Entamoeba histolytica is a foodborne pathogen that causes amoebic dysentery in approximately 100 million people each year worldwide. E. histolytica exists as cysts and trophozoites. Cysts are ingested in contaminated food and convert to the trophozoite form which colonizes the large intestine to cause disease. The trophozoites can convert back into cysts to spread infection. 

There is little information about how encystation (conversion from trophozoite back to cyst) occurs in E. histolytica. This has been well studied in the reptile pathogen Entamoeba invadens, including evaluation of gene expression during encystation and excystation. An online data resource was used to identify motifs present in the promoter region of genes that exhibited similar expression profiles. This bioinformatics showed that there are significant motifs within the genome of E. invadens when analyzing patterns and locations.  The gene expression of E. invadens was then compared to that of E. histolytica in order to discover more about the relationship between the pathogens.