Gut‐specific genes from the black fly Simulium vittatum encoding trypsin‐like and carboxypeptidase‐like proteins

A. Ramos, A. Mahowald, M. Jacobs‐Lorena

Research output: Contribution to journalArticle

Abstract

In haematophagous insects digestion of the blood meal provides nutrients for survival and essential components for egg production. We have isolated and partially characterized two gut‐specific genes from the black fly Simulium vittatum. Sequence analysis revealed that both are highly similar to digestive proteases, one to trypsins and the other to carboxypeptidases. RNA blot analysis indicates that the expression of these two genes is regulated in a sexspecific manner; when fed the same sucrose‐based diet, expression in males is substantially lower than in females. In females, expression of both genes is strongly induced by a blood meal. At 6 h after the blood meal the trypsin‐like gene product was immunolocalized to the midgut epithelium and to the outer layers of the peritrophic matrix.

Original languageEnglish (US)
Pages (from-to)149-163
Number of pages15
JournalInsect molecular biology
Volume1
Issue number3
DOIs
StatePublished - Feb 1993
Externally publishedYes

Keywords

  • Simulium
  • carboxypeptidase
  • gut.
  • trypsin

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Insect Science

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