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- W2754425433 abstract "The great radiation in the infraorder Cyclorrhapha involved several morphological and molecular changes, including important changes in anterior egg development. During Drosophila oogenesis, exuperantia (exu) is critical for localizing bicoid (bcd) messenger RNA (mRNA) to the anterior region of the oocyte. Because it is phylogenetically older than bcd, which is exclusive to Cyclorrhapha, we hypothesize that exu has undergone adaptive changes to enable this new function. Although exu has been well studied in Drosophila, there is no functional or transcriptional information about it in any other Diptera. Here, we investigate exu in the South American fruit fly Anastrepha fraterculus, a Cyclorrhapha of great agricultural importance that have lost bcd, aiming to understand the evolution of exu in this infraorder. We assessed its pattern of gene expression in A. fraterculus by analyzing transcriptomes from cephalic and reproductive tissues. A combination of next-generation data with classical sequencing procedures enabled identification of the structure of exu and its alternative transcripts in this species. In addition to the sex-specific isoforms described for Drosophila, we found that not only exu is expressed in heads, but this is mediated by two transcripts with a specific 5'UTR exon-likely a result from usage of a third promoter. Furthermore, we tested the hypothesis that exu is evolving under positive selection in Cyclorrhapha after divergence from lower Diptera. We found evidence of positive selection at two important exu domains, EXO-like and SAM-like, both involved with mRNA binding during bcd mRNA localization in Drosophila, which could reflect its cooptation for the new function of bcd mRNA localization in Cyclorrhapha." @default.
- W2754425433 created "2017-09-25" @default.
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- W2754425433 date "2017-09-01" @default.
- W2754425433 modified "2023-09-24" @default.
- W2754425433 title "Evolutionary coincidence of adaptive changes in exuperantia and the emergence of bicoid in Cyclorrhapha (Diptera)" @default.
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- W2754425433 doi "https://doi.org/10.1007/s00427-017-0594-3" @default.
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