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相关概念视频

Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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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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Translation01:31

Translation

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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
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Translation01:31

Translation

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Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Alternative RNA Splicing02:18

Alternative RNA Splicing

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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相关实验视频

Updated: Jan 12, 2026

In Vivo Modeling of the Morbid Human Genome using Danio rerio
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替代性开始的密码子选择塑造了线粒体功能和罕见的人类疾病.

Jimmy Ly1, Matteo Di Bernardo1, Yi Fei Tao1

  • 1Whitehead Institute for Biomedical Research, Cambridge, MA, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA.

Molecular cell
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概括
此摘要是机器生成的。

替代性起始密码子选择产生了对细胞和线粒体功能至关重要的双局部蛋白质. 这个过程与罕见的遗传疾病有关,为疾病机制提供了新的见解.

关键词:
TRNT1 TRNT1 的时间其他替代的N端异型.另类翻译 替代翻译线粒体中的线粒体.蛋白质组的多样性 蛋白质组的多样性罕见的疾病 罕见的疾病开始 codon 的选择.开始翻译 开始翻译

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科学领域:

  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.
  • 进化生物学 进化生物学

背景情况:

  • 罕见的遗传疾病影响数百万,通常影响线粒体.
  • 线粒体,关键的器官,执行重要的细胞功能.
  • 替代性起始密码子选择产生具有不同局部性的蛋白质异型.

研究的目的:

  • 研究替代翻译在产生双局部化蛋白质中的作用.
  • 探索这些异构体的进化起源.
  • 为了确定替代翻译和罕见遗传疾病之间的联系.

主要方法:

  • 对N端蛋白质异型的分析.
  • 鉴定差异局部化异形对.
  • 检查影响替代蛋白质变异的罕见疾病等位基因.

主要成果:

  • 数以百计的不同局部蛋白质异构体被确定.
  • 发现了对线粒体和宿主细胞功能至关重要的双局部化异构体.
  • 发现了数十种影响这些异型的罕见疾病等位基因,称为异型选择性等位基因 (ISA).

结论:

  • 替代翻译在蛋白质定位和功能中起着重要作用.
  • 双局部化异构体与线粒体一起进化.
  • 同位体选择性等位基因对罕见遗传疾病的分子和临床多样性有所贡献.