Characterisation and localisation of the opsin protein repertoire in the brain and retinas of a spider and an onychophoran

BMC Evolutionary Biology

Axel Schmid³  Gerhard Steiner¹  David Fredman²  Bo Joakim Eriksson³ 

[1] Department of Integrative Zoology, Faculty of Life Sciences, University of Vienna, Vienna, Austria;Department of Molecular Evolution and Development, Faculty of Life Sciences, University of Vienna, Vienna, Austria;Department of Neurobiology, Faculty of Life Sciences, University of Vienna, Vienna, Austria

关键词: Transcriptome;    Ciliary opsin;    Expression pattern;    Spider;    Onychophora;    Opsins;   

Others  :  1086410
DOI  :  10.1186/1471-2148-13-186

 received in 2013-03-01, accepted in 2013-09-03,  发布年份 2013

【 摘 要 】

Background

Opsins have been found in the majority of animals and their most apparent functions are related to vision and light-guided behaviour. As an increasing number of sequences have become available it has become clear that many opsin-like transcripts are expressed in tissues other than the eyes. Opsins can be divided into three main groups: rhabdomeric opsins (r-opsins), ciliary opsins (c-opsins) and group 4 opsins. In arthropods, the main focus has been on the r-opsins involved in vision. However, with increased sequencing it is becoming clear that arthropods also possess opsins of the c-type, group 4 opsins and the newly discovered arthropsins but the functions of these opsins are unknown in arthropods and data on their localisation is limited or absent.

Results

We identified opsins from the spider Cupiennius salei and the onychophoran Euperipatoides kanangrensis and characterised the phylogeny and localisation of these transcripts. We recovered all known visual opsins in C. salei, and in addition found a peropsin, a c-opsin and an opsin resembling Daphnia pulex arthropsin. The peropsin was expressed in all eye types except the anterior median eyes. The arthropsin and the c-opsin were expressed in the central nervous system but not the eyes. In E. kanangrensis we found: a c-opsin; an opsin resembling D. pulex arthropsins; and an r-opsin with high sequence similarity to previously published onychophoran onychopsins. The E. kanangrensis c-opsin and onychopsin were expressed in both the eyes and the brain but the arthropsin only in the brain.

Conclusion

Our novel finding that opsins of both the ciliary and rhabdomeric type are present in the onychophoran and a spider suggests that these two types of opsins were present in the last common ancestor of the Onychophora and Euarthropoda. The expression of the c-opsin in the eye of an onychophoran indicates that c-opsins may originally have been involved in vision in the arthropod clade. The lack of c-opsin expression in the spider retina suggests that the role for c-opsin in vision was lost in the euarthropods. Our discovery of arthropsin in onychophorans and spiders dates the emergence of arthropsin to the common ancestor of Onychophora and Euarthropoda and their expression in the brain suggests a non-visual function.

【 授权许可】

   
2013 Eriksson et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 3.

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