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Related Experiment Videos

Genetic control over fragile X chromosome expression.

F Hecht, J P Fryns, R F Vlietinck

    Clinical Genetics
    |March 1, 1986
    PubMed
    Summary

    Genetic factors entirely determine the expression of fragile X chromosome in males. Studies show that the proportion of fragile X cells is 99.6% heritable between brothers, indicating no environmental influence.

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    Area of Science:

    • Cytogenetics
    • Human Genetics
    • Molecular Biology

    Background:

    • Fragile sites exhibit variable cytogenetic expression.
    • The proportion of cells showing fragile sites differs significantly.
    • The genetic basis for this variability remains unclear.

    Purpose of the Study:

    • To investigate the genetic determination of fragile X chromosome expression variability.
    • To quantify the heritability of fragile X expression in males.

    Main Methods:

    • Examined proportions of lymphocytes with fragile X in a large cohort of males.
    • Calculated heritability using correlations between brothers and cousins.
    • Compared fragile X cell proportions in related versus unrelated males.

    Main Results:

    • Fragile X cell proportions were solely determined by genetic factors.
    • Heritability estimates were 99.6% for brothers and 94.4% for cousins.
    • Unrelated males with fragile X showed 0% heritability.

    Conclusions:

    • Fragile X chromosome expression in males is purely genetically determined.
    • Environmental factors do not influence the expression of the fragile X chromosome.
    • High heritability confirms a strong genetic basis for fragile X expression.

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