The extraembryonic serosa is a frontier epithelium providing the insect egg with a full-range innate immune response.

Abstract:

:Drosophila larvae and adults possess a potent innate immune response, but the response of Drosophila eggs is poor. In contrast to Drosophila, eggs of the beetle Tribolium are protected by a serosa, an extraembryonic epithelium that is present in all insects except higher flies. In this study, we test a possible immune function of this frontier epithelium using Tc-zen1 RNAi-mediated deletion. First, we show that bacteria propagate twice as fast in serosa-less eggs. Then, we compare the complete transcriptomes of wild-type, control RNAi, and Tc-zen1 RNAi eggs before and after sterile or septic injury. Infection induces genes involved in Toll and IMD-signaling, melanisation, production of reactive oxygen species and antimicrobial peptides in wild-type eggs but not in serosa-less eggs. Finally, we demonstrate constitutive and induced immune gene expression in the serosal epithelium using in situ hybridization. We conclude that the serosa provides insect eggs with a full-range innate immune response.

journal_name

Elife

journal_title

eLife

authors

Jacobs CG,Spaink HP,van der Zee M

doi

10.7554/eLife.04111

subject

Has Abstract

pub_date

2014-12-09 00:00:00

issn

2050-084X

journal_volume

3

pub_type

杂志文章

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