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Biolistic transformation of Schistosoma mansoni: Studies with modified reporter-gene constructs containing regulatory regions of protease genes

Authors
Journal
Molecular and Biochemical Parasitology
0166-6851
Publisher
Elsevier
Volume
170
Issue
1
Identifiers
DOI: 10.1016/j.molbiopara.2009.11.001
Keywords
  • Schistosoma
  • Protease
  • Transgene
  • Gene Promoter
  • Biolistics
  • Electroporation
Disciplines
  • Biology

Abstract

Abstract Biolistics of the flatworm parasite Schistosoma mansoni facilitates the accurate spatial expression of transgenes under the control of gene-specific promoter elements. To improve transgene expression, either in the number of positive worms and/or an increased transgene signal per worm, we tested plasmid constructs incorporating 5′ and 3′ gene-specific genomic fragments, and parts of the open reading frame for two S. mansoni proteases, cathepsins F and D (SmCF and SmCD). GFP-expression was gut-localized, a novel finding for SmCD and consistent with previous data for SmCF. The mCherry fluorescent protein can also operate as a reporter. Though certain constructs imparted stronger and better distributed signals per positive worm, the low yields throughout (1–5% positive per experiment) precluded further quantifications of improvement. Electroporation of the same constructs was also weakly efficient (1–10% positives per experiment). However, reporter signals were found in tissues other than the gut, which may represent dysregulated transcription.

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