title: Differential gene expression in Schistosoma japonicum schistosomula from Wistar rats and BALB/c mice.
abstract: BACKGROUND
  More than 46 species of mammals can be naturally infected with Schistosoma japonicum in the mainland of China. Mice are permissive and may act as the definitive host of the life cycle. In contrast, rats are less susceptible to S. japonicum infection, and are considered to provide an unsuitable micro-environment for parasite growth and development. Since little is known of what effects this micro-environment has on the parasite itself, we have in the present study utilised a S. japonicum oligonucleotide microarray to compare the gene expression differences of 10-day-old schistosomula maintained in Wistar rats with those maintained in BALB/c mice.
  
  
  RESULTS
  In total 3,468 schistosome genes were found to be differentially expressed, of which the majority (3,335) were down-regulated (≤ 2 fold) and 133 were up-regulated (≥ 2 fold) in schistosomula from Wistar rats compared with those from BALB/c mice. Gene ontology (GO) analysis revealed that of the differentially expressed genes with already established functions or close homology to well characterized genes in another organisms, many are related to important biological functions or molecular processes. Among the genes that were down-regulated in schistosomula from Wistar rats, some were associated with metabolism, signal transduction and development. Of these genes related to metabolic processes, areas including translation, protein and amino acid phosphorylation, proteolysis, oxidoreductase activities, catalytic activities and hydrolase activities, were represented. KEGG (Kyoto Encyclopedia of Genes and Genomes) pathway analysis of differential expressed genes indicated that of the 328 genes that had a specific KEGG pathway annotation, 324 were down-regulated and were mainly associated with metabolism, growth, redox pathway, oxidative phosphorylation, the cell cycle, ubiquitin-mediated proteolysis, protein export and the MAPK (mitogen-activated protein kinases) signaling pathway.
  
  
  CONCLUSIONS
  This work presents the first large scale gene expression study identifying the differences between schistosomula maintained in mice and those maintained in rats, and specifically highlights differential expression that may impact on the survival and development of the parasite within the definitive host. The research presented here provides valuable information for the better understanding of schistosome development and host-parasite interactions.
authors.affiliation: Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Animal Parasitology, Ministry of Agriculture, 518 Ziyue road, Minhang, Shanghai 200241, China.
authors.forename: Jinbiao
authors.initials: J
authors.lastname: Peng
authors.forename: Hongxiao
authors.initials: H
authors.lastname: Han
authors.forename: Geoffrey N
authors.initials: GN
authors.lastname: Gobert
authors.forename: Yang
authors.initials: Y
authors.lastname: Hong
authors.forename: Weibin
authors.initials: W
authors.lastname: Jiang
authors.forename: Xinzhi
authors.initials: X
authors.lastname: Wang
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Fu
authors.forename: Jinming
authors.initials: J
authors.lastname: Liu
authors.forename: Yaojun
authors.initials: Y
authors.lastname: Shi
authors.forename: Jiaojiao
authors.initials: J
authors.lastname: Lin
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D020869:Gene Expression Profiling; D051379:Mice; D008807:Mice, Inbred BALB C; D046228:Microarray Analysis; D051381:Rats; D017208:Rats, Wistar; D012376:Rodent Diseases / Q000469:parasitology; D012549:Schistosoma japonicum / Q000235:genetics / Q000472:pathogenicity*; D012554:Schistosomiasis japonica / Q000469:parasitology*