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相关概念视频

Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

170
Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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Heterochromatin02:38

Heterochromatin

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
14.6K
Euchromatin01:01

Euchromatin

7.6K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
7.6K
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

6.6K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
6.6K
Viruses with RNA Genomes01:29

Viruses with RNA Genomes

146
RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Mechanisms of Retrovirus-induced Cancers01:51

Mechanisms of Retrovirus-induced Cancers

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Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
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相关实验视频

Updated: Sep 18, 2025

Detection of the Genome and Transcripts of a Persistent DNA Virus in Neuronal Tissues by Fluorescent In situ Hybridization Combined with Immunostaining
13:22

Detection of the Genome and Transcripts of a Persistent DNA Virus in Neuronal Tissues by Fluorescent In situ Hybridization Combined with Immunostaining

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人类乳头瘤病毒基因组在持续性病毒感染期间与主体活性染色体相关.

Alix Warburton, Tovah E Markowitz, Jj L Miranda

    bioRxiv : the preprint server for biology
    |June 26, 2025
    PubMed
    概括

    人类乳头瘤病毒 (HPV) 与活跃的宿主细胞染色体结合,以维持基因表达. 这种与转录活跃区域的关联,容易发生DNA断裂,可能解释癌症中的病毒DNA集成.

    科学领域:

    • 分子生物学分子生物学
    • 病毒学 病毒学
    • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.

    背景情况:

    • 人类乳头瘤病毒 (HPV) 通过保持其基因组作为宿主角质细胞核内的小染色体来建立持久性感染.
    • 了解病毒基因组与宿主染色体之间的相互作用对于阐明病毒持久性和病原性至关重要.

    研究的目的:

    • 研究HPV31基因组与宿主染色体结构的关联.
    • 确定HPV31基因组定位是否与活跃的转录区域和DNA损伤部位相关.

    主要方法:

    • 利用染色体构造捕获技术,包括HiC和4C-seq,绘制HPV31基因组与宿主染色质的相互作用.
    • 整合了ATAC-seq (开放色素) 和ChIP-seq (Brd4,H3K27ac超增强剂) 的数据,以定义宿主色素状态.
    • 与公开可用的数据集相关的病毒基因组关联站点,用于双链DNA断裂 (dsDNA断裂) 和宫癌中的HPV整合站点.

    主要成果:

    • HPV31基因组首选与宿主染色体的转录活性"A"部分相关.
    • 病毒基因组定位与开放的染色体区域 (ATAC-seq) 和超级增强剂 (Brd4,H3K27ac ChIP-seq) 强烈相关.
    • 在宫癌和容易发生dDNA断裂的区域中,HPV31关联部位与已知的HPV整合部位有显著的重叠.

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    Last Updated: Sep 18, 2025

    Detection of the Genome and Transcripts of a Persistent DNA Virus in Neuronal Tissues by Fluorescent In situ Hybridization Combined with Immunostaining
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    Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins
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    结论:

    • HPV31基因组与宿主细胞转录中心结合,以确保感染期间的病毒基因表达活跃.
    • 偏好转录活跃的,易破坏dDNA的染色体区域可能解释了在HPV相关癌症中观察到的高频率的病毒DNA整合.