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Related Experiment Videos

Genetic variation in restriction patterns among mouse amylase gene complexes.

K K Thomsen, J P Hjorth, J T Nielsen

    Biochemical Genetics
    |April 1, 1984
    PubMed
    Summary

    Genetic variation in mouse pancreatic amylase (P am) expression is linked to regulatory elements, not DNA rearrangements. Congenic mouse lines reveal differences in enzyme production and isoenzyme patterns due to these regulatory variations.

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    Area of Science:

    • Genetics
    • Biochemistry
    • Molecular Biology

    Background:

    • Pancreatic amylase (P am) expression in mice shows significant genetic variation.
    • Congenic mouse lines on a C3H/As background display diverse amylase complexes, isoenzyme forms, and production levels.

    Purpose of the Study:

    • To investigate the genetic basis of pancreatic amylase expression variation in mice.
    • To determine if differences in enzyme production and isoenzyme patterns are due to structural DNA changes or regulatory elements.

    Main Methods:

    • Utilized congenic mouse lines with distinct amylase complexes.
    • Employed DNA digestion with endonucleases and hybridization to an amylase cDNA probe.
    • Analyzed restriction fragment patterns to compare DNA sequences across different lines.

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    Main Results:

    • Identical restriction patterns between inbred stocks and congenic lines indicate amylase-like sequences are within the amylase complex.
    • Congenic lines with varied amylase expression showed different restriction patterns.
    • Lines with identical amylase phenotypes exhibited uniform restriction patterns.
    • Danish mouse-derived lines showed the highest resemblance in restriction patterns, suggesting conserved DNA structure.

    Conclusions:

    • Differences in mouse pancreatic amylase expression are likely caused by variations in regulatory elements controlling the active structural amylase genes.
    • Major DNA rearrangements within the amylase complex are unlikely to be the primary cause of observed expression differences.