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Phototransduction in fan worm radiolar eyes

Research output: Contribution to journalLetter

Original languageEnglish
Pages (from-to)R698-R699
JournalCurrent Biology
Volume27
Issue number14
DOIs
DateAccepted/In press - 31 May 2017
DatePublished (current) - 24 Jul 2017

Abstract

Fan worms (Annelida: Sabellidae) are sessile polychaetes that spend their adult lives in tubes and project their fans, composed of radiolar tentacles, up into the water column for respiration and filter feeding. To protect the fan from predation, many species have evolved unique compound eyes on the radioles that function as shadow or motion detectors, eliciting a rapid withdrawal response in reaction to encroaching objects in the water column [1,2]. The structure of the eyes, their complexity, and their arrangements on the radioles are very diverse among sabellid genera [3] and they display many characteristics atypical of polychaete eyes, such as ciliary photoreceptors [3,4] that hyperpolarize in response to illumination [5]. Here we examine the retinal transcriptome of the radiolar eyes from the fan worm Megalomma interrupta. We find that the opsin, the protein component of light sensitive visual pigments, and other phototransduction cascade signaling proteins expressed in these eyes are related to those commonly associated with vertebrate ciliary photoreceptors, as opposed to the rhabdomeric receptors found in the primary eyes of many invertebrates. With previous anatomical and physiological observations, these results suggest that the radiolar eyes arose independently in fan worms.

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://doi.org/10.1016/j.cub.2017.05.093 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 4.69 MB, PDF document

    Licence: CC BY-NC-ND

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