三种塞拉萨尔米尼 (Serrasalmidae: Characiformes) 动物的染色体表征
Alan Gomes Dos Santos1, José Francisco de Sousa E Souza1, Simone Cardoso Soares1
1Instituto Nacional de Pesquisas da Amazônia (INPA), Programa de Pós-graduação em Genética, Conservação e Biologia Evolutiva, Laboratório de Genética Animal, Manaus, AM, Brazil.
Genetics and molecular biology
|November 22, 2023
概括
对塞拉萨尔米尼鱼的细胞遗传学分析显示,双胞胎数量保留,但染色体公式多样化,表明通过非罗伯茨的重排序实现了多样化. 这项研究澄清了这种多样化的鱼类部落中的分类学不确定性.
科学领域:
- 鱼类学 鱼类学 鱼类学
- 细胞遗传学 细胞遗传学
- 分子生物学分子生物学
背景情况:
- 塞拉萨尔米尼部落表现出分类学上的不确定性和副类属性.
- 细胞遗传学方法对于理解鱼群进化至关重要.
- 之前的研究强调了需要详细描述Serrasalmini物种的需要.
研究的目的:
- 在细胞遗传学上描述Serrasalmini类中的三个物种:Pristobrycon striolatus,Catoprion absconditus和Pygopristis denticulatus.
- 研究塞拉萨尔米尼部落内的染色体多样性和进化关系.
- 识别特定物种的染色体标记物,并了解它们的遗传学含义.
主要方法:
- 型定型用于确定染色体数量和形态.
- 通过C-绑定来确定异色染色体的分布.
- 核心组织者区域 (NORs) 的分析.
- 光在位杂交 (FISH) 用于绘制18S和5S核糖体DNA (rDNA) 位点的地图.
- 纤维-FISH用于分析rDNA合成和排列.
主要成果:
- 这三种物种共享62个染色体的二倍体数 (2n),具有不同的核型公式.
- 在所有物种中,异色染色体主要是中心和末端的,在染色体对1 (m) 上有一个独特的间位块.
- 观察到多个C波段阳性NOR,与18SrDNA映射证实了额外的网站.
- 在所有物种中,5S rDNA始终位于染色体对1 (m) 长臂的间歇区域.
- 在C. absconditus和P. denticulatus中观察到18S和5SrDNA之间的合成,通过纤维-FISH.出现间隔.
结论:
- 保存的二倍体数 (2n=62) 表明,类内的多样化是通过非罗伯茨的重新排列而发生的.
- 独特的型公式和rDNA位置突出了特定物种的染色体进化.
- 这些发现支持塞拉萨尔米尼部落内相关物种的过生性质.
- 细胞遗传数据为塞拉萨尔米尼鱼的进化历史和分类学提供了宝贵的见解.
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