New Approach Data in Electric Fish (Teleostei: Gymnotus): Sex Chromosome Evolution and Repetitive DNA
New Approach Data in Electric Fish (Teleostei: Gymnotus): Sex Chromosome Evolution and Repetitive DNA
复制标题
DOI：
10.1089/zeb.2013.0966
复制
发表时间：
2014-12-01
期刊：
影响因子：
2
通讯作者：
Feldberg, Eliana
中科院分区：
文献类型：
--
作者：
da Silva, Maelin;Matoso, Daniele Aparecida;Feldberg, Eliana
拮抗性选择是XX/XY和ZZ/ZW等性染色体起源和多样化背后的驱动力。然而，主要在鱼类中，染色体的移动性可能导致最近起源的染色体的形成，这一过程被称为周转。裸腹鱼科由Electrophorus+Gymnotus属组成，呈现出X1 X1 X2 X2/X1 X2 Y型的复系统，该系统已被描述为Pantanal裸腹鱼。本文描述了三种亚马逊裸腹鱼（Gymnotus carapo“卡塔劳”2n=40 XX/XY，Gymnotus coropinae 2n =49雄性/50雌性X1 X1 X2 X2/X1 X2 Y，Gymnotus sp.“Negro”2n=50 XX/XY）的核型，揭示了它们的简单系统和多系统的存在。我们假设G. carapo“卡塔劳”是G.在这方面，他指出，潘塔纳尔的多重系统，以及随后的多重系统的多样化发生在亚马逊和巴拉那盆地最终分离之后。此外，G. coropinae的多重系统可能起源于裸腹蛛的简单系统。“Gymnotidae family的有性生殖中物种之间的距离，以及进化枝G1和G2之间性染色体公式和数目的差异，coropinae和G. sp.“Negro”种和“Carapo”分支。G. carapo和G. pantanal物种的研究表明，这两个序列的性系统独立发生，支持其他提出的模型，并强调了这样一个事实，即裸腹属物种可能作为一个模型，研究性染色体周转。
Antagonist sexual selection is the driving force behind the origin and diversification of sex chromosomes such as XX/XY and ZZ/ZW. However, chromosome mobility, mainly in fishes, may result in the formation of chromosomes of recent origin, a process known as turnover. The family Gymnotidae, which is composed of the genera Electrophorus+Gymnotus, presents a multiple system of the type X1X1X2X2/X1X2Y, which has been described for Gymnotus pantanal. This article describes the karyotype of three Amazon Gymnotus species, revealing the presence of both simple and multiple systems: Gymnotus carapo "Catalao" 2n=40 XX/XY, Gymnotus coropinae 2n=49 male/50 female X1X1X2X2/X1X2Y, and Gymnotus sp. "Negro" 2n=50 XX/XY. Our hypothesis is that the simple system present in G. carapo "Catalao" is ancestral in relation to G. pantanal's multiple system and that the diversification of the subsequent multiple system occurred after the final separation of the Amazon and Parana basins. Moreover, G. coropinae's multiple system may have originated from the simple system present in Gymnotus sp. "Negro." The distant position between the species in the Gymnotidae family's phylogeny in addition to differences in sex chromosome formula and number between Clade G1 G. coropinae and G. sp. "Negro" species and "Carapo" Clade. G. carapo and G. pantanal species suggest that both sequences of sexual systems occurred independently, supporting other proposed models and highlighting the fact that species of the genus Gymnotus may serve as a model for studying sex chromosome turnover.