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相关概念视频

Genome Annotation and Assembly03:36

Genome Annotation and Assembly

18.9K
The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
18.9K
Karyotyping01:17

Karyotyping

61.9K
Overview
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Chromosome Structure02:40

Chromosome Structure

23.0K
A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
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Chromatin Packaging01:32

Chromatin Packaging

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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
16.8K
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

7.9K
In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
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Updated: Jul 27, 2025

Hybrid De Novo Genome Assembly for the Generation of Complete Genomes of Urinary Bacteria using Short- and Long-read Sequencing Technologies
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染色体层次的基因组组合.

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概括

一个新的Salvia miltiorrhiza与色根系线揭示了Sm2OGD3作为tanshinone生物合成中的关键酶. 这一发现增强了对药用坦辛化合物生产的理解.

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科学领域:

  • 植物生物化学 植物生物化学
  • 基因组学就是基因组学.
  • 代谢工程是代谢工程.

背景情况:

  • 沙尔维亚米尔蒂奥里萨对于治疗心血管疾病至关重要,因为它的红色根富含色素.
  • 一个独特的S. miltiorrhiza线 (shh) 表现出色的根,不同于tanshinone配置文件.

研究的目的:

  • 调查色根系S. miltiorrhiza系中改变的坦辛积累的遗传基础.
  • 为了确定负责tanshinone生物合成中的代谢转变的酶.

主要方法:

  • 染色体层次的shh线的基因组组合.
  • 对比基因组学和转录组学以确定遗传变异.
  • 补充测定和体外酶活性测试.

主要成果:

  • 在shh线中确定了Sm2OGD3中1.0kb的DNA片段删除.
  • 过度表达Sm2OGD3恢复了 furan D环坦辛的积累.
  • 证实Sm2OGD3作为一个坦辛15,16-脱酶的功能.

结论:

  • Sm2OGD3 是一个关键的酶,通过催化特定tanshinone前体的转化来调节tanshinone生物合成.
  • 这些发现为Salvia miltiorrhiza中重要的药用化合物的代谢途径提供了新的见解.