Cytogenetic analysis in Tetragonopterus franciscoensis (Characiformes): another piece to the karyoevolutionary puzzle of tetra fishes

IF 2.1 4区生物学 Q2 Agricultural and Biological Sciences

Caryologia Pub Date : 2023-09-19 DOI:10.36253/caryologia-2145

Mauricio Barros Fernandes, Jamille De Araújo Bitencourt, Joandson Calixto dos Santos, José Henrique Galdino, Paulo Roberto Antunes de Mello Affonso

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引用次数: 0

Abstract

Tetragonopterus is a taxonomically complex genus in Characidae, being currently represented by nine species according to integrative approaches. One of them, T. franciscoensis was recently validated in rivers from northeastern Brazil. Even though molecular and morphological data have been collected in Tetragonopterus, the cytogenetic analyses in this group are scarce despite of the role of chromosomal variation in speciation. Herein, we present the first detailed karyotypic study in T. franciscoensis along with a comparative analysis with published cytogenetic data in characin fish. All specimens shared 2n=52 distributed in 12 metacentric (m), 12 submetacentric (sm), and 28 subtelocentric/acrocentric (st/a) chromosomes for both sexes as well as single nucleolus organizer regions on short arms of pair 8 and several GC-rich sites. The mapping of telomeric sequences (TTAGGG)n revealed no telomeric interstitial signals. While subtle cytogenetic differences were observed between samples from northeastern basins in Brazil, corroborating a recent genetic divergence, distinct karyotypes were detected in relation to congeneric taxa from other Brazilian regions. Therefore, the origin of large biarmed pairs in species with low 2n values should be related to occurrence of centric fusions.

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franciscotetragonopterus的细胞遗传学分析(特征):四目鱼类核进化之谜的另一块

四爪蝶属(Tetragonopterus)是蝗科中一个分类学较为复杂的属，目前有9种。其中之一，T. franciscoensis最近在巴西东北部的河流中得到了验证。尽管已经收集了四爪龙的分子和形态学数据，但尽管染色体变异在物种形成中的作用，该群体的细胞遗传学分析仍然很少。在此，我们首次详细研究了franciscoensis的核型，并与已发表的特征鱼的细胞遗传学数据进行了比较分析。所有标本共有2n=52，分别分布在12个稳中心(m)、12个亚稳中心(sm)和28个亚远中心/顶中心(st/a)染色体上，以及8对短臂上的单核仁组织区和几个富含gc的位点。端粒序列图谱(TTAGGG)n未显示端粒间质信号。虽然在巴西东北部盆地的样本之间观察到细微的细胞遗传学差异，证实了最近的遗传分化，但在巴西其他地区的同类分类群中发现了不同的核型。因此，在低2n值的物种中，大双臂对的起源应该与中心融合的发生有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Caryologia 生物-遗传学

CiteScore

1.60

自引率

23.80%

发文量

审稿时长

12 months

期刊介绍： Caryologia is devoted to the publication of original papers, and occasionally of reviews, about plant, animal and human karyological, cytological, cytogenetic, embryological and ultrastructural studies. Articles about the structure, the organization and the biological events relating to DNA and chromatin organization in eukaryotic cells are considered. Caryologia has a strong tradition in plant and animal cytosystematics and in cytotoxicology. Bioinformatics articles may be considered, but only if they have an emphasis on the relationship between the nucleus and cytoplasm and/or the structural organization of the eukaryotic cell.