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Related Concept Videos

Transcription Initiation01:47

Transcription Initiation

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Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
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General Transcription Factors01:30

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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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RNA Polymerase II Accessory Proteins02:36

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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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Transcription Elongation Factors02:35

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Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
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Dynamic transcription pre-initiation complex assembly governs initiation efficiency.

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    Transcription initiation is inefficient, with most RNA polymerase II (Pol II) dissociating early. Non-canonical assembly pathways enhance initiation efficiency and reduce pausing.

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    Area of Science:

    • Molecular Biology
    • Gene Regulation
    • Biophysics

    Background:

    • Transcription initiation dictates gene expression but its dynamics and efficiency are poorly understood.
    • Existing knowledge gaps hinder a complete understanding of gene regulation mechanisms.

    Purpose of the Study:

    • To quantitatively map RNA polymerase II (Pol II) behavior during transcription initiation and early elongation in live human cells.
    • To investigate the mechanisms governing transcription initiation efficiency and promoter-proximal pausing.

    Main Methods:

    • Endogenous tagging of human Pol II and TFIID.
    • Simultaneous live-cell, multi-color single-molecule imaging.
    • Genuine Rate Identification (GRID) analysis for kinetic population resolution.

    Main Results:

    • Identified four distinct kinetic populations of chromatin-bound Pol II, revealing high initiation inefficiency (>94% dissociation).
    • Quantified promoter-proximal pausing, sensitive to CDK9 inhibition, and observed significant cell-to-cell heterogeneity.
    • Found that Pol II-TFIID colocalization correlates with higher efficiency and reduced pausing.
    • Canonical TFIID-first assembly leads to inefficient initiation and pausing, while non-canonical Pol II-first assembly promotes efficiency.

    Conclusions:

    • Transcription initiation efficiency is determined by Pol II kinetic stability and the temporal order of pre-initiation complex assembly.
    • Non-canonical assembly pathways offer a novel mechanism for enhancing gene transcription regulation.
    • These findings provide a new framework for understanding dynamic gene regulation in vivo.