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Related Concept Videos

Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
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Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Nascent CUT&Tag captures transcription factor binding after chromatin duplication.

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    Chromatin proteins are displaced during DNA replication and must reassemble. Nascent CUT&Tag tracks GAGA factor (GAF) recovery on new DNA, revealing distinct early and late binding patterns linked to cell cycle and development.

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    Area of Science:

    • Molecular Biology
    • Epigenetics
    • Genomics

    Background:

    • DNA replication necessitates the removal and reassembly of chromatin proteins behind the replication fork.
    • Understanding the dynamics of chromatin reassembly is crucial for maintaining genome integrity and gene regulation.

    Purpose of the Study:

    • To develop a method for tracking chromatin reassembly on newly synthesized DNA.
    • To investigate the recovery dynamics of the GAGA factor (GAF) on nascent chromatin in Drosophila Kc cells.

    Main Methods:

    • Development of Nascent CUT&Tag, a chromatin profiling technique utilizing antibody-targeted in situ tagmentation.
    • Direct measurement of transcription factor binding on nascent chromatin.
    • Tracking GAGA factor (GAF) recovery kinetics and motif analysis.

    Main Results:

    • GAGA factor (GAF) is displaced during DNA replication and exhibits varied recovery times (minutes to hours).
    • Early GAF recovery correlates with shorter motifs and cell cycle progression functions.
    • Late GAF recovery correlates with longer, degenerate motifs and developmental functions.
    • GAF recovery requires Brahma Associated Factor (BAF)-mediated chromatin remodeling, highlighting the role of nucleosome eviction.

    Conclusions:

    • Nascent CUT&Tag is an effective method for studying transcription factor dynamics on newly synthesized DNA.
    • GAF recovery is a dynamic process with distinct temporal and functional characteristics.
    • Chromatin remodeling by BAF is essential for the complete reestablishment of GAF binding to nascent chromatin.