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相关概念视频

Mismatch Repair01:36

Mismatch Repair

Overview
Mutations01:39

Mutations

Overview
Position-effect Variegation02:32

Position-effect Variegation

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.
Mutations01:35

Mutations

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...
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Point and Frameshift Mutations01:30

Point and Frameshift Mutations

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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相关实验视频

Updated: Jul 13, 2026

Methods to Increase the Sensitivity of High Resolution Melting Single Nucleotide Polymorphism Genotyping in Malaria
10:27

Methods to Increase the Sensitivity of High Resolution Melting Single Nucleotide Polymorphism Genotyping in Malaria

Published on: November 10, 2015

在MDR1基因中的"沉默"多态变化改变了基底特异性.

Chava Kimchi-Sarfaty1, Jung Mi Oh, In-Wha Kim

  • 1Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA. kimchi@cber.fda.gov

Science (New York, N.Y.)
|December 23, 2006
PubMed
概括

在多药耐药性1 (MDR1) 基因中的同义单核酸多态 (SNPs) 改变P-糖蛋白 (P-gp) 功能. 尽管蛋白质水平没有变化,但这种情况仍然发生,这表明结构变化会影响药物相互作用.

科学领域:

  • 药物基因组学 药物基因组学
  • 分子生物学分子生物学
  • 蛋白质生物化学 蛋白质生物化学

背景情况:

  • 同义词单核酸多态 (SNPs) 通常不会改变蛋白质序列或功能.
  • 多种药物耐药性1 (MDR1) 基因编码P-糖蛋白 (P-gp),这是一个关键的排泄,参与药物运输.
  • 以前的研究将某些MDR1单元类型与改变的P-gp功能联系起来.

研究的目的:

  • 研究MDR1基因中同名SNP的功能影响.
  • 要确定这个同义词SNP是否影响P-glycoprotein (P-gp) 与药物和抑制剂的相互作用.

主要方法:

  • 野生类型和多态P-gp的比较分析.
  • 评估mRNA和蛋白质表达水平.
  • 评估P-gp构成和与基质和抑制剂的相互作用.

主要成果:

  • 发现MDR1基因中的同名SNP改变了P-gp药物和抑制剂相互作用.
  • 野生类型和多态P-gp表现出类似的mRNA和蛋白质水平.
  • 在野生类型和多态变体之间观察到改变的P-gp构造.

结论:

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High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment
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High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment

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Identifying Mutations by High Resolution Melting in a TILLING Population of Rice
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Identifying Mutations by High Resolution Melting in a TILLING Population of Rice

Published on: September 2, 2019

  • 同名SNP可以通过超出编码序列变化的机制影响蛋白质功能.
  • 与同名SNP相关的罕见编码子的存在可能会影响共翻译折叠和膜插入.
  • 这一过程可以导致蛋白质构造的改变和基质/抑制剂相互作用部位的改变,影响药物的疗效和药理动力学.