title: Entamoeba histolytica: construction and applications of subgenomic databases.
abstract: Knowledge about the influence of environmental stress such as the action of chemotherapeutic agents on gene expression in Entamoeba histolytica is limited. We plan to use oligonucleotide microarray hybridization to approach these questions. As the basis for our array, sequence data from the genome project carried out by the Institute for Genomic Research (TIGR) and the Sanger Institute were used to annotate parts of the parasite genome. Three subgenomic databases containing enzymes, cytoskeleton genes, and stress genes were compiled with the help of the ExPASy proteomics website and the BLAST servers at the two genome project sites. The known sequences from reference species, mostly human and Escherichia coli, were searched against TIGR and Sanger E. histolytica sequence contigs and the homologs were copied into a Microsoft Access database. In a similar way, two additional databases of cytoskeletal genes and stress genes were generated. Metabolic pathways could be assembled from our enzyme database, but sometimes they were incomplete as is the case for the sterol biosynthesis pathway. The raw databases contained a significant number of duplicate entries which were merged to obtain curated non-redundant databases. This procedure revealed that some E. histolytica genes may have several putative functions. Representative examples such as the case of the delta-aminolevulinate synthase/serine palmitoyltransferase are discussed.
authors.affiliation: Department of Specific Prophylaxis and Tropical Medicine, Center for Physiology and Pathophysiology, Medical University of Vienna, Kinderspitalgasse 15, A-1095 Vienna, Austria.
authors.forename: Margit
authors.initials: M
authors.lastname: Hofer
authors.forename: Michael
authors.initials: M
authors.lastname: Duchêne
mesh_terms: D000624:5-Aminolevulinate Synthetase / Q000737:chemistry / Q000235:genetics; D000217:Acyltransferases / Q000737:chemistry / Q000235:genetics; D000581:Amidohydrolases / Q000737:chemistry / Q000235:genetics; D000595:Amino Acid Sequence; D000818:Animals; D000981:Antiprotozoal Agents / Q000494:pharmacology; D001483:Base Sequence; D003599:Cytoskeleton / Q000235:genetics; D030541:Databases, Genetic; D004080:Dihydroorotase / Q000737:chemistry / Q000235:genetics; D004748:Entamoeba histolytica / Q000187:drug effects / Q000201:enzymology / Q000235:genetics*; D017125:Genes, Protozoan / Q000502:physiology; D018503:Genome, Protozoan; D006360:Heat-Shock Proteins / Q000235:genetics; D006418:Heme / Q000096:biosynthesis; D006801:Humans; D008795:Metronidazole / Q000494:pharmacology; D020411:Oligonucleotide Array Sequence Analysis; D051102:Serine C-Palmitoyltransferase; D013107:Sphingolipids / Q000096:biosynthesis; D013261:Sterols / Q000096:biosynthesis
chemical_list: D000981:Antiprotozoal Agents; D006360:Heat-Shock Proteins; D013107:Sphingolipids; D013261:Sterols; D008795:Metronidazole; D006418:Heme; D000217:Acyltransferases; D000624:5-Aminolevulinate Synthetase; C495089:SPTLC2 protein, human; D051102:Serine C-Palmitoyltransferase; D000581:Amidohydrolases; C020047:dihydropyrimidinase; D004080:Dihydroorotase; C019659:allantoinase