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相关概念视频

Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
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Position-effect Variegation02:32

Position-effect Variegation

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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.
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Histone Variants at the Centromere02:30

Histone Variants at the Centromere

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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
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相关实验视频

Updated: Jun 25, 2025

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
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分子和细胞环境影响SCN8A变体的功能.

Carlos G Vanoye1, Tatiana V Abramova1, Jean-Marc DeKeyser1

  • 1Department of Pharmacology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.

JCI insight
|May 21, 2024
PubMed
概括
此摘要是机器生成的。

与神经发育障碍相关的致病性SCN8A变体显示出功能改变,这取决于特定的NaV1.6通道拼接异型. 了解这种背景对于准确的变种分类至关重要.

关键词:
是一种病.遗传学 遗传学 是一个神经发育 神经发育神经科学是一个神经科学.通道中的.

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科学领域:

  • 神经科学是一个神经科学.
  • 遗传学 遗传学 是一个
  • 分子生物学分子生物学

背景情况:

  • 编码NaV1.6电压通道的SCN8A中的致病变体与神经发育障碍,如发育性和性脑病变有关.
  • 以前对SCN8A变异的功能研究可能受到新生儿拼接异型和工程 TTX 耐药突变的使用限制.

研究的目的:

  • 研究SCN8A替代拼接对疾病相关变异的功能属性的影响.
  • 为了比较15个SCN8A变体在两个发育调节的NaV1.6拼接异型 (NaV1.6N和NaV1.6A) 的功能.

主要方法:

  • 使用自动化补丁记录用于高通量分析.
  • 开发了一种具有低内源通道电流的神经元细胞系 (ND7/LoNav),以避免TTX抗性突变.
  • 在ND7/LoNav细胞中表达了具有或没有TTX抗性突变的NaV1.6N和NaV1.6A异型.

主要成果:

  • 表达的NaV1.6N和NaV1.6A异型在电压依赖的激活和非激活中显示出微妙但显著的差异.
  • 与野生类型 (WT) 通道相比,耐TTX变种显示出明显的功能差异.
  • 许多与疾病相关的SCN8A变体表现出异形依赖的功能效应.
  • 变异性功能往往不能清楚地被分类为功能获取或丧失.

结论:

  • SCN8A的替代拼接显著影响了致病变异的功能后果.
  • 调查SCN8A变体需要考虑分子 (同位体) 和细胞环境.
  • SCN8A变种的功能分类可能比简单的功能增益或丧失更复杂.