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Related Concept Videos

Histone Modification02:32

Histone Modification

13.0K
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
13.0K
Euchromatin01:01

Euchromatin

6.8K
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...
6.8K
Position-effect Variegation02:32

Position-effect Variegation

6.3K
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.
6.3K
Heterochromatin02:38

Heterochromatin

9.5K
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...
9.5K
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

8.2K
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
8.2K
The Nucleosome Core Particle01:12

The Nucleosome Core Particle

829
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
829

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Expression Analysis of Mammalian Linker-histone Subtypes
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Expression Analysis of Mammalian Linker-histone Subtypes

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Histones Classification Based on EGFET Signals.

Jeffrey Barahona, Hayley Richardson, Lina Acosta

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    Summary
    This summary is machine-generated.

    This study developed a biosensor for detecting Human Histones (H4), crucial for understanding diseases like cancer. Machine learning analysis confirmed its high accuracy and robustness, even with manufacturing variations.

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    Analysis of Histone Antibody Specificity with Peptide Microarrays
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    Area of Science:

    • Biomedical Engineering
    • Molecular Biology
    • Analytical Chemistry

    Background:

    • Histone dysregulation is linked to cancers and neurodegenerative diseases.
    • Histone-specific biosensors are vital for chromatin dynamics and epigenetic regulation research.
    • Advancements in biosensor technology can drive breakthroughs in cancer research and personalized medicine.

    Purpose of the Study:

    • To quantify the biosensor's ability to differentiate Human Histones (H4) from other molecules.
    • To analyze biosensor performance using classification methods and machine learning.
    • To explore the impact of manufacturing defects and environmental factors on histone detection.

    Main Methods:

    • Development of a biosensor using a KU7 RNA aptamer on a gold electrode.
    • Application of classification methods to analyze biosensor data.
    • Utilizing machine learning for exploratory analysis of sensor performance under varying conditions.

    Main Results:

    • Achieved high classification performance with an F1 score exceeding 0.99 for Human Histones (H4) detection.
    • Identified key features providing physical insights into sensor operation beyond typical analysis.
    • Machine learning analysis demonstrated robustness against manufacturing variations and environmental changes.

    Conclusions:

    • The developed biosensor demonstrates high specificity and accuracy for Human Histones (H4) detection.
    • The sensor's performance insights can enhance future biosensor design and application.
    • Machine learning integration offers a pathway for reliable histone detection in diverse, real-world scenarios.