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- Title
Evolution of Chemosensory Gene Families in Arthropods: Insight from the First Inclusive Comparative Transcriptome Analysis across Spider Appendages.
- Authors
Vizueta, Joel; Frías-López, Cristina; Macías-Hernández, Nuria; Arnedo, Miquel A.; Sánchez-Gracia, Alejandro; Rozas, Julio
- Abstract
Unlike hexapods and vertebrates, in chelicerates, knowledge of the specificmolecules involved in chemoreception comes exclusively from the comparative analysis of genomesequences. Indeed, the genomes of mites, ticks and spiders contain several genes encoding homologs of some insect membrane receptors and small soluble chemosensory proteins. Here, we conducted for the first time a comprehensive comparative RNA-Seq analysis across different body structures of a chelicerate: the nocturnal wandering hunter spider Dysdera silvatica Schmidt 1981. Specifically, we obtained the complete transcriptome of this species as well as the specific expressionprofile in the first pair of legs and the palps, which are thought to be the specific olfactory appendages in spiders, and in the remaining legs, which also have hairs that have been morphologically identified as chemosensory. We identified several ionotropic (Ir) and gustatory (Gr) receptor family members exclusively or differentially expressed across transcriptomes, some exhibiting a distinctive pattern in the putative olfactory appendages. Furthermore, these IRs were the only known olfactory receptors identified in such structures. These results, integrated with an extensive phylogenetic analysis across arthropods, uncover a specialization of the chemosensory gene repertoire across the body of D. silvatica and suggest that some IRs likely mediate olfactory signaling in chelicerates. Noticeably, we detected the expression of a gene family distantly related to insect odorant-binding proteins (OBPs), suggesting that this gene family ismore ancient than previously believed, as well as the expression of an uncharacterized gene family encoding small globular secreted proteins, which appears to be a good chemosensory gene family candidate.
- Subjects
ARTHROPODA; CHEMICAL senses; NUCLEOTIDE sequencing; RNA sequencing; OLFACTORY receptors; INVERTEBRATE phylogeny
- Publication
Genome Biology & Evolution, 2017, Vol 9, Issue 1, p178
- ISSN
1759-6653
- Publication type
Article
- DOI
10.1093/gbe/evw296