Proliferating cells in suborbital tissue drive eye migration in flatfish

生物 比目鱼 解剖 神经科学 进化生物学 渔业
作者
Baolong Bao,Zhonghe Ke,Jing Xing,Eric Peatman,Zhanjiang Liu,Chaotian Xie,Bing Xu,Junwei Gai,Xiaoling Gong,Guimei Yang,Yan Jiang,Wenyong Tang,Dianxu Ren
出处
期刊:Developmental Biology [Elsevier BV]
卷期号:351 (1): 200-207 被引量:45
标识
DOI:10.1016/j.ydbio.2010.12.032
摘要

The left/right asymmetry of adult flatfishes (Pleuronectiformes) is remarkable given the external body symmetry of the larval fish. The best-known change is the migration of their eyes: one eye migrates from one side to the other. Two extinct primitive pleuronectiformes with incomplete orbital migration have again attracted public attention to the mechanism of eye migration, a subject of speculation and research for over a century. Cranial asymmetry is currently believed to be responsible for eye migration. Contrary to that hypothesis, we show here that the initial migration of the eye is caused by cell proliferation in the suborbital tissue of the blind side and that the twist of frontal bone is dependent on eye migration. The inhibition of cell proliferation in the suborbital area of the blind side by microinjected colchicine was able to prevent eye migration and, thereafter, cranial asymmetry in juvenile Solea senegalensis (right sideness, Soleidae), Cynoglossus semilaevis (left sideness, Cynoglossidae), and Paralichthys olivaceus (left sideness, Paralichthyidae) with a bottom-dwelling lifestyle. Our results correct the current misunderstanding that eye migration is driven by the cranial asymmetry and simplify the explanation for broken left/right eye-symmetry. Our findings should help to focus the search on eye migration-related genes associated with cell proliferation. Finally, a novel model is proposed in this research which provides a reasonable explanation for differences in the migrating eye between, and sometimes within, different species of flatfish and which should aid in our overall understanding of eye migration in the ontogenesis and evolution of Pleuronectiformes.
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