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相关概念视频

Mutations01:39

Mutations

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Overview
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Mutations01:35

Mutations

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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Point and Frameshift Mutations01:30

Point and Frameshift Mutations

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Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...
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Genome Copying Errors02:46

Genome Copying Errors

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DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
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Mutations in Microorganisms01:18

Mutations in Microorganisms

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Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
479
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

7.9K
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.
In contrast, regions which code...
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A Protocol for Functional Assessment of Whole-Protein Saturation Mutagenesis Libraries Utilizing High-Throughput Sequencing
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结构突变设置一个平衡的非编码基因组部分.

Juliette Luiselli1,2, Paul Banse3,4, Olivier Mazet5

  • 1INSA-Lyon, CNRS, Université Claude Bernard Lyon 1, ECL, Université Lumière Lyon 2, LIRIS UMR5205, Lyon F-69621, France.

Molecular biology and evolution
|November 28, 2025
PubMed
概括
此摘要是机器生成的。

基因组大小的进化是由突变偏差和对抗DNA损伤的强度的选择驱动的. 这些力量决定了基因组中的平衡非编码DNA分数.

关键词:
进化 演化 演化 演化 演化 演化 演化 演化基因组大小 基因组大小数学建模的数学建模没有编码的基因组.结构突变 结构突变

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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.
  • 数学建模的数学建模

背景情况:

  • 塑造非编码基因组大小的进化压力尚未完全理解.
  • 很大一部分非编码DNA缺乏明显的功能,挑战了适应主义理论.
  • 现有的非适应性理论侧重于突变过程或危害,但缺乏整合.

研究的目的:

  • 介绍基因组大小演变的数学模型.
  • 确定控制非编码基因组部分的基本力量.
  • 将现有的非适应性理论整合到一个统一的框架中.

主要方法:

  • 开发一个简单的数学模型,用于基因组大小进化.
  • 分析力量,包括突变偏差和强度选择.
  • 模拟双链断裂对基因组稳定性的影响.

主要成果:

  • 非编码基因组部分是由内在的突变偏差决定的,这种偏差有利于中性添加.
  • 强度选择是由较大的基因组中的结构突变驱动的,也塑造了非编码DNA.
  • 基于突变偏差和人口层面的因素,建立了一个平衡非编码分数.

结论:

  • 基因组大小进化受到突变中立性偏差和强度选择的影响.
  • 该模型为理解非编码DNA丰富性提供了一个统一的框架.
  • 平衡非编码分数取决于突变偏差和种群大小和突变率的乘积.