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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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类似的遗传路径独立地针对熊蜂的模拟色彩融合.

Heather M Hines1,2, Tunc Dabak1, Sarthok Rasique Rahman1,3,4

  • 1Department of Biology, The Pennsylvania State University, University Park, PA 16802, USA.

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概括

熊蜂独立地通过关键基因Abdominal B (Abd-B) 的变化进化出了类似的颜色模式. 这种霍克斯基因调节着色素的产生,揭示了模仿进化的共同遗传途径.

关键词:
这就是Evo-devo.霍克斯·霍克斯 (Hox Hox) 是一个骗子.收 收 收 收 收 收进化遗传学的进化遗传学黑色素是什么 黑色素是什么这是一个ncRNARNA.

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科学领域:

  • 进化生物学是进化的生物学.
  • 基因组学就是基因组学.
  • 发育生物学是发展生物学.

背景情况:

  • 熊蜂表现出各种各样的颜色图案,由穆勒尔模仿驱动.
  • 融合进化允许物种获得类似的色彩多态.
  • 了解模仿类平行进化的遗传基础至关重要.

研究的目的:

  • 为了研究北美大黄蜂平行色彩模式进化背后的遗传机制.
  • 确定负责腹部色彩变化的基因和调节途径.
  • 探索基因调控网络在模仿获取过程中如何演变.

主要方法:

  • 全基因组关联研究以确定最初的基因标.
  • 跨发育转录组学揭示遗传途径.
  • 三种熊蜂分类对与不同的模仿区域进行了比较分析.

主要成果:

  • 这三种谱系都独立地准了霍克斯基因腹部B (Abd-B) 的调节区域.
  • 在两个物种中观察到同一监管位置的不同删除.
  • 发现了一种涉及Abd-B,nubbin和木的共享基因网络,它调节了黑色素的产生.

结论:

  • 霍克斯基因腹部B (Abd-B) 是熊蜂颜色模式并行进化的关键目标.
  • 模仿的融合进化涉及修改一个保存的基因调节网络.
  • 这项研究提供了关于表型进化和基因网络动态的遗传基础的见解.