An insight into the sialotranscriptome of the seed-feeding bug, Oncopeltus fasciatus

Ivo M.B. Francischetti, Angela H. Lopes, Felipe A. Dias, Van M. Pham, José M.C. Ribeiro

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


The salivary transcriptome of the seed-feeding hemipteran, Oncopeltus fasciatus (milkweed bug), is described following assembly of 1025 expressed sequence tags (ESTs) into 305 clusters of related sequences. Inspection of these sequences reveals abundance of low complexity, putative secreted products rich in the amino acids (aa) glycine, serine or threonine, which might function as silk or mucins and assist food canal lubrication and sealing of the feeding site around the mouthparts. Several protease inhibitors were found, including abundant expression of cystatin transcripts that may inhibit cysteine proteases common in seeds that might injure the insect or induce plant apoptosis. Serine proteases and lipases are described that might assist digestion and liquefaction of seed proteins and oils. Finally, several novel putative proteins are described with no known function that might affect plant physiology or act as antimicrobials.

Original languageEnglish (US)
Pages (from-to)903-910
Number of pages8
JournalInsect Biochemistry and Molecular Biology
Issue number9
StatePublished - Sep 2007
Externally publishedYes


  • Feeding
  • Phytophagy
  • Salivary glands
  • Sialotranscriptome

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Insect Science


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