Sindbis virus induces the production of a novel class of endogenous siRNAs in Aedes aegypti mosquitoes.

Abstract:

:Small RNA regulatory pathways are used to control the activity of transposons, regulate gene expression and resist infecting viruses. We examined the biogenesis of mRNA-derived endogenous short-interfering RNAs (endo-siRNAs) in the disease vector mosquito Aedes aegypti. Under standard conditions, mRNA-derived endo-siRNAs were produced from the bidirectional transcription of tail-tail overlapping gene pairs. Upon infection with the alphavirus, Sindbis virus (SINV), another class of mRNA-derived endo-siRNAs was observed. Genes producing SINV-induced endo-siRNAs were not enriched for overlapping partners or nearby genes, but were enriched for transcripts with long 3' untranslated regions. Endo-siRNAs from this class derived uniformly from the entire length of the target transcript, and were found to regulate the transcript levels of the genes from which they were derived. Strand-specific quantitative PCR experiments demonstrated that antisense strands of targeted mRNA genes were produced to exonic, but not intronic regions. Finally, small RNAs mapped to both sense and antisense strands of exon-exon junctions, suggesting double-stranded RNA precursors to SINV-induced endo-siRNAs may be synthesized from mature mRNA templates. These results suggest additional complexity in small RNA pathways and gene regulation in the presence of an infecting virus in disease vector mosquitoes.

journal_name

Insect Mol Biol

journal_title

Insect molecular biology

authors

Adelman ZN,Anderson MA,Liu M,Zhang L,Myles KM

doi

10.1111/j.1365-2583.2012.01141.x

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

357-68

issue

3

eissn

0962-1075

issn

1365-2583

journal_volume

21

pub_type

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