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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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对拉戈莫尔法生物多样化的分子时间估计.

Leandro Iraçabal1, Matheus R Barbosa1, Alexandre Pedro Selvatti2

  • 1Departamento de Genética, Rio de Janeiro, Universidade Federal do Rio de Janeiro, CCS, Instituto de Biologia, Rio de Janeiro, Brazil.

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概括

形动物,包括子和皮卡,表现出明确的家族和属单一性. 它们的多样化始于古人类时代,类的辐射显著增加,因为它们的身体变得更大,运动效率更高.

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科学领域:

  • 进化生物学 进化生物学
  • 分子遗传学分子遗传学
  • 哺乳动物多样化的多样化

背景情况:

  • 形动物 (子,子,皮卡) 是Glires的关键成员,但它们的进化历史和多样化仍未使用分子数据进行研究.
  • 之前的遗传学研究往往缺乏综合的分类样本采集,或使用不那么严格的统计支持他们的发现.
  • 测试Lagomorph家族和属的单性对理解它们的进化关系至关重要.

研究的目的:

  • 通过使用扩展的分子数据,严格测试形动物家族 (Leporidae,Ochotonidae) 和属的单一性.
  • 为了重建一个强大的家族遗传树,并估计形动物多样化的分歧时间.
  • 为了比较形动物的进化模式与动物 (Muroidea) 的进化模式.

主要方法:

  • 用5个线粒体和14个核基因的超级矩阵进行基因分析,来自88种种类,包括动物外群.
  • 最大概率树重建与启动分析,以获得强大的分支支持.
  • 使用六个基于化石的校准点进行时间树的构建,并通过刀校准测试估计分歧时间.

主要成果:

  • 这项研究恢复了单体动物家族Leporidae和Ochotonidae,以及大多数测试的属.
  • 在Ochotona属中,Conothoa和Pika亚属是单体的,但Ochotona本身不是.
  • 形动物的多样化起源于早期的古老时代,类动物表现出一种主要的辐射事件,其特点是身体尺寸更大,运动能力更强.

结论:

  • 这项研究提供了一种强大的分子系谱,证实了拉戈莫尔夫家族和单一类的属性.
  • 这些发现突出了类动物显著的适应辐射,使得生态成功与动物和皮卡相比.
  • 结果提供了对Lagomorpha在Glires中的进化历史和多样化动态的关键见解.