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Related Concept Videos

Transcription Factors02:16

Transcription Factors

70.6K
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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Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Gene Duplication and Divergence02:37

Gene Duplication and Divergence

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
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General Transcription Factors01:30

General Transcription Factors

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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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Related Experiment Video

Updated: May 4, 2026

Correlating Gene-specific DNA Methylation Changes with Expression and Transcriptional Activity of Astrocytic KCNJ10 Kir4.1
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Differences in human alpha-, beta- and delta-globin gene expression in monkey kidney cells.

R K Humphries, T Ley, P Turner

    Cell
    |August 1, 1982
    PubMed
    Summary

    Human globin gene expression was studied using plasmid vectors in COS cells. The beta-globin gene promoter requires an enhancer for function, unlike the alpha-globin gene promoter.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Gene Regulation

    Background:

    • The human globin genes (alpha, beta, delta) are crucial for hemoglobin synthesis.
    • Understanding their promoter activity and regulation is key to comprehending hemoglobinopathies.

    Purpose of the Study:

    • To compare the functional activity of human alpha-, beta-, and delta-globin gene promoters.
    • To investigate the role of enhancer elements in globin gene expression.

    Main Methods:

    • Utilized plasmid expression vectors derived from pBR322.
    • Introduced vectors into monkey kidney cells (COS cells) via calcium-phosphate-mediated DNA transfer.
    • Analyzed gene expression based on promoter activity and enhancer dependence.

    Main Results:

    • The alpha-globin gene promoter functioned independently.
    • The beta- and delta-globin gene promoters were highly dependent on the SV40 enhancer element.
    • When linked, the alpha promoter was active, but the beta promoter was not.
    • Beta-globin gene activity was approximately 50 times greater than delta-globin gene activity in the presence of the enhancer.

    Conclusions:

    • Globin gene promoter function differs significantly, with beta and delta genes requiring enhancer elements for activity.
    • The observed expression ratio of beta to delta globin genes in vitro mirrors in vivo levels, validating the experimental system.