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相关概念视频

Evolutionary Relationships through Genome Comparisons02:54

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
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染色体的演化和DNA序列的定位.

Rafiq Ahmad1,2,3, Paulina Tomaszewska4,5, M Kausar Nawaz Shah6

  • 1Department of Genetics, Genomics and Cancer Sciences, University of Leicester, Leicester, LE1 7RH, UK. rafiqahmad.uaar@gmail.com.

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概括
此摘要是机器生成的。

分子细胞遗传学绘制了Allium物种中的45S和5SrDNA基因. TSA-FISH显示了色素基因定位的局限性,但rDNA发现提供了进化见解.

关键词:
(Allium) 是一种.在现场混合化.45S 和 5S 的 rDNA 是什么?染色体进化的过程一个复制基因的单一副本.

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科学领域:

  • 植物遗传学 植物遗传学
  • 分子细胞遗传学 分子细胞遗传学
  • 基因组学就是基因组学.

背景情况:

  • 分子细胞遗传学使用DNA探针对染色体进行基因映射.
  • 属物种是植物遗传学中重要的模型生物.

研究的目的:

  • 在三种Allium物种中定位45S和5S核糖体DNA (rDNA) 基因.
  • 通过TSA-FISH研究在Allium cepa中定位色素生物合成基因 (PAL和FLS) 的可行性.

主要方法:

  • 在现场杂交被用来绘制Allium cepa,Allium sativum和Allium fistulosum中的45S和5SrDNA基因.
  • 泰拉米德信号放大光现场混合 (TSA-FISH) 用于检测与色素相关的基因 (PAL和FLS) 在介质和介质染色体上.

主要成果:

  • 在研究的Allium物种中观察到45S和5SrDNA探针的染色体定位和信号强度的变化.
  • 在Allium sativum (异合体) 的8号染色体上检测到额外的5SrDNA信号.
  • 初步结果表明,PAL基因定位在介质代相染色体上,FLS基因在Allium cepa.中的 mitotic染色体上.

结论:

  • 发现TSA-FISH技术对于在植物染色体中一致的探针定位既不是常规,也不是强大的.
  • rDNA基因映射为研究的Allium物种之间的进化关系提供了洞察力.