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Positional RNA-Seq identifies candidate genes for phenotypic engineering of sexual traits

Arbore, Roberto and Sekii, Kiyono and Beisel, Christian and Ladurner, Peter and Berezikov, Eugene and Schärer, Lukas. (2015) Positional RNA-Seq identifies candidate genes for phenotypic engineering of sexual traits. Frontiers in zoology, 12. p. 14.

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Official URL: http://edoc.unibas.ch/41884/

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Abstract

Introduction: RNA interference (RNAi) of trait-specific genes permits the manipulation of specific phenotypic traits (“phenotypic engineering”) and thus represents a powerful tool to test trait function in evolutionary studies. The identification of suitable candidate genes, however, often relies on existing functional gene annotation, which is usually limited in emerging model organisms, especially when they are only distantly related to traditional genetic model organisms. A case in point is the free-living flatworm Macrostomum lignano (Lophotrochozoa: Platyhelminthes: Rhabditophora), an increasingly powerful model organism for evolutionary studies of sex in simultaneous hermaphrodites. To overcome the limitation of sparse functional annotation, we have performed a positional RNA-Seq analysis on different body fragments in order to identify organ-specific candidate transcripts. We then performed gene expression (in situ hybridization) and gene function (RNAi) analyses on 23 candidate transcripts, both to evaluate the predictive potential of this approach and to obtain preliminary functional characterizations of these candidate genes. Results: We identified over 4000 transcripts that could be expected to show specific expression in different reproductive organs (including testis, ovary and the male and female genital systems). The predictive potential of the method could then be verified by confirming organ-specific expression for several candidate transcripts, some of which yielded interesting trait-specific knock-down phenotypes that can now be followed up in future phenotypic engineering studies. Conclusions: Our positional RNA-Seq analysis represents a highly useful resource for the identification of candidate transcripts for functional and phenotypic engineering studies in M. lignano, and it has already been used successfully in several studies. Moreover, this approach can overcome some inherent limitations of homology-based candidate selection and thus should be applicable to a broad range of emerging model organisms.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Zoologie > Evolutionary Biology (Schärer)
UniBasel Contributors:Schärer, Lukas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:BioMed Central
ISSN:1742-9994
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:05 Jul 2018 09:06
Deposited On:15 Sep 2016 06:27

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