Radiolar Eyes of Serpulid Worms (Annelida, Serpulidae): Structures, Function, and Phototransduction
Radiolar Eyes of Serpulid Worms (Annelida, Serpulidae): Structures, Function, and Phototransduction
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DOI：
10.1086/694735
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发表时间：
2017-08-01
影响因子：
1.6
通讯作者：
Nilsson, Dan-Eric
中科院分区：
文献类型：
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作者：
Bok, Michael J.;Porter, Megan L.;Nilsson, Dan-Eric
扇形蠕虫，以sabellid和serpulid多毛类为代表，有一个惊人的阵列不寻常的眼睛和感光器位于他们的epperial喂养附属物。在这里，我们组织这些眼睛在serpulids和报告新的解剖，分子和生理数据，其结构，功能和进化和可能的身份，他们的光转导机制的先前的描述。我们报告说，在sabellids，serpulids显示了广泛的多样性的放射眼的安排和单眼结构。此外，在Spirobranchus corniculatus（一种魅力圣诞树蠕虫）的眼睛中表达的视觉色素最大吸收波长为464 nm的光。这种视觉色素与浅珊瑚礁栖息地的下行辐射光谱非常匹配，并支持以下假设，即这些放射性光感受器的功能是作为剪影检测防盗报警器，当蠕虫受到潜在捕食者的威胁时，会触发快速撤退反应。最后，我们报告的转录组测序结果的放射眼的S。corniculatus，其在其睫状辐射光感受器中表达无脊椎动物C型视蛋白，与在sabellid Acromegalomma interruptum的辐射眼中发现的视蛋白密切相关。我们探讨了潜在的共同的进化谱系之间的放射性感光器的serpulids和sabellids，并考虑这些独特的创新，在更广泛的背景下后生动物的眼睛进化。
Fan worms, represented by sabellid and serpulid polychaetes, have an astonishing array of unusual eyes and photoreceptors located on their eponymous feeding appendages. Here we organize the previous descriptions of these eyes in serpulids and report new anatomical, molecular, and physiological data regarding their structure, function, and evolution and the likely identity of their phototransduction machinery. We report that, as in sabellids, serpulids display a broad diversity of radiolar eye arrangements and ocellar structures. Furthermore, the visual pigment expressed in the eyes of Spirobranchus corniculatus, a species of the charismatic Christmas tree worms, absorbs light maximally at 464 nm in wavelength. This visual pigment closely matches the spectrum of downwelling irradiance in shallow coral reef habitats and lends support to the hypothesis that these radiolar photoreceptors function as a silhouette-detecting burglar alarm that triggers a rapid withdrawal response when the worm is threatened by potential predators. Finally, we report on the transcriptomic sequencing results for the radiolar eyes of S. corniculatus, which express invertebrate c-type opsins in their ciliary radiolar photoreceptors, closely related to the opsin found in the radiolar eyes of the sabellid Acromegalomma interruptum. We explore the potential for a shared evolutionary lineage between the radiolar photoreceptors of serpulids and sabellids and consider these unique innovations in the broader context of metazoan eye evolution.