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Related Experiment Videos

Complementation of gene deletions by cell hybridization.

C F Cori, S Gluecksohn-Waelsch, H P Klinger

    Proceedings of the National Academy of Sciences of the United States of America
    |January 1, 1981
    PubMed
    Summary

    Mouse chromosome 7 deletions cause liver enzyme deficiencies. Somatic cell hybridization revealed that the tyrosine aminotransferase (TAT) structural gene is not on chromosome 7, but other genes controlling liver cell differentiation are involved.

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    Area of Science:

    • Genetics
    • Molecular Biology
    • Biochemistry

    Background:

    • Overlapping deletions on mouse chromosome 7 lead to reduced activity of liver-specific enzymes, such as tyrosine aminotransferase (TAT).
    • The precise function and location of the deleted genes responsible for these enzyme deficiencies remain unclear.

    Purpose of the Study:

    • To investigate the nature and function of genes affected by deletions on mouse chromosome 7.
    • To determine the chromosomal location of the structural gene for TAT and identify other potentially deleted genes impacting liver enzyme activity.

    Main Methods:

    • Somatic cell hybridization was employed, fusing enzyme-deficient mouse liver cells with 2S Faza rat hepatoma cells.
    • Analysis of hybrid cell colonies for TAT activity and glucose-6-phosphate isomerase 1 (GPI-1) as a marker for chromosome 7.

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    Main Results:

    • Inducible mouse TAT activity was detected in hybrid cells derived from mutant mouse liver cells, ruling out the TAT structural gene being within the deleted chromosome 7 regions.
    • GPI-1 analysis confirmed that chromosome 7 does not carry the TAT structural gene, suggesting it resides on a different chromosome.
    • The deletions appear to encompass regulatory genes essential for maintaining the differentiated state of liver cells, rather than the structural genes for the affected enzymes.

    Conclusions:

    • The structural gene for TAT is not located on mouse chromosome 7.
    • The observed liver enzyme deficiencies are likely due to deletions of regulatory genes on chromosome 7 that control liver cell differentiation.
    • Further research is needed to identify the specific regulatory genes and their mechanisms of action.