Molecular pedomorphism underlies craniofacial skeletal evolution in Antarctic notothenioid fishes.
Molecular pedomorphism underlies craniofacial skeletal evolution in Antarctic notothenioid fishes.
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DOI：
10.1186/1471-2148-10-4
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发表时间：
2010-01-06
影响因子：
3.4
通讯作者：
Postlethwait JH
中科院分区：
文献类型：
--
作者：
Albertson RC;Yan YL;Titus TA;Pisano E;Vacchi M;Yelick PC;Detrich HW 3rd;Postlethwait JH
雌雄同体是成体在后代分类群中保留祖先幼体特征的现象。尽管它对进化变化很重要，但很少有这种现象的分子基础的例子。Notothenioid是海洋鱼类中描述最好的物种群之一，但它们的多样性目前受到快速变化的南极气候的威胁。无脊椎动物的进化史的特点是从底栖祖先到中上层捕食者的平行辐射，伴随着几个多形态特征的出现，包括导致浮力增加的骨骼矿化减少。我们比较了两种远洋性脊椎动物--尖头海鞘和北极纹夜蛾--的头面部骨骼发育，并与一种底栖物种--角背双钩鱼和斑马鱼--以及两个外类群--刺鱼和斑马鱼进行了比较。与其他物种相比，远洋小鳞鱼表现出咽骨发育的延迟，这与骨骼基因表达的离散异时性转移有关，这与幼体发育期间软骨形成程序的持续性和成骨程序的延迟相一致。形态分析还显示，相对于背侧和后侧，鼻咽骨架的前部和腹部成分的发育存在偏差。我们的数据支持这一假说，即颅面部骨骼基因表达的相对时间的早期变化可能对南极脊椎动物向远洋栖息地的适应性辐射产生了显著影响。
Pedomorphism is the retention of ancestrally juvenile traits by adults in a descendant taxon. Despite its importance for evolutionary change, there are few examples of a molecular basis for this phenomenon. Notothenioids represent one of the best described species flocks among marine fishes, but their diversity is currently threatened by the rapidly changing Antarctic climate. Notothenioid evolutionary history is characterized by parallel radiations from a benthic ancestor to pelagic predators, which was accompanied by the appearance of several pedomorphic traits, including the reduction of skeletal mineralization that resulted in increased buoyancy. We compared craniofacial skeletal development in two pelagic notothenioids, Chaenocephalus aceratus and Pleuragramma antarcticum, to that in a benthic species, Notothenia coriiceps, and two outgroups, the threespine stickleback and the zebrafish. Relative to these other species, pelagic notothenioids exhibited a delay in pharyngeal bone development, which was associated with discrete heterochronic shifts in skeletal gene expression that were consistent with persistence of the chondrogenic program and a delay in the osteogenic program during larval development. Morphological analysis also revealed a bias toward the development of anterior and ventral elements of the notothenioid pharyngeal skeleton relative to dorsal and posterior elements. Our data support the hypothesis that early shifts in the relative timing of craniofacial skeletal gene expression may have had a significant impact on the adaptive radiation of Antarctic notothenioids into pelagic habitats.
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影响因子：
7
作者：
Iwamoto, M;Kitagaki, J;Enomoto-Iwamoto, M
通讯作者：
Enomoto-Iwamoto, M
影响因子：
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作者：
Akiyama, H;Chaboissier, MC;de Crombrugghe, B
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de Crombrugghe, B
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Postlethwait, JH
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作者：
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通讯作者：
Crump, JG
影响因子：
30.8
作者：
Bell, DM;Leung, KKH;Cheah, KSE
通讯作者：
Cheah, KSE