Cis-acting elements, CArG-, E-, CCAAT- and TATA-boxes may be involved in sexually regulated gene transcription in Schistosoma mansoni
Mem. Inst. Oswaldo Cruz
;
97(suppl.1): 85-90, Oct. 2002. ilus, tab, graf
Article
in English
| LILACS
| ID: lil-325035
ABSTRACT
Schistosomes undergo various morphological and metabolic changes during their development, reflected in a finely tuned regulation of protein and/or gene expression. The mechanisms involved in the control of gene expression during the development of the parasite are not understood. Two actin genes had been previously cloned and observed to be differentially expressed during the maturation of the parasite. The SmAct gene contains four putative cis-regulatory elements (TATA-, CCAAT-, E- and CArG-boxes). Our objective was to investigate in greater detail the expression pattern of two actin genes and verify if the binding of nuclear proteins to the promoter elements of SmAct correlated with the expression profile observed. We detected little variation in the expression of actin genes during the first seven days of schistosomula culture in vitro. However, we observed significantly higher levels of expression in males compared to female adults. CArG and CCAAT elements bound to a greater extent and formed distinct complexes with male in comparison to female nuclear extracts. In contrast, female extracts bound weakly to the E-box probe while no binding was observed with male extracts. Taken together these results describe cis-acting elements that appear to be involved in sexually regulated gene expression in Schistosoma mansoni
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Schistosoma mansoni
/
Gene Expression Regulation
/
Promoter Regions, Genetic
/
DNA-Binding Proteins
Limits:
Animals
Language:
English
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
Tropical Medicine
/
Parasitology
Year:
2002
Type:
Article
/
Congress and conference
Affiliation country:
Brazil
/
United kingdom
Institution/Affiliation country:
Fiocruz/BR
/
Universidade Federal do Rio de Janeiro/BR
/
Universidade do Vale do Rio Doce/BR
/
University of York/GB
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