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Genetic basis of individual differences in tissue composition.

T Ohtsuki, V Klissouras

    Acta Geneticae Medicae Et Gemellologiae
    |January 1, 1976
    PubMed
    Summary

    Genetic factors significantly influence bone tissue differences in adolescent boys. While muscle and total area show some genetic influence, fat tissue variations are largely environmental. Bone density is primarily determined by genetics.

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    Area of Science:

    • Human physiology
    • Genetics
    • Body composition analysis

    Background:

    • Understanding the genetic and environmental influences on body composition is crucial for adolescent health.
    • Previous studies have explored twin differences in various anthropometric measures.

    Purpose of the Study:

    • To investigate the heritability of muscle, subcutaneous fat, and bone tissue in adolescent males.
    • To differentiate the contributions of genotype versus environment to body composition variations.

    Main Methods:

    • Utilized 19 pairs of adolescent twin boys (14 monozygotic, 5 dizygotic).
    • Employed ultrasonic imaging to capture upper arm cross-sectional areas.
    • Calculated intrapair differences for total area, muscle, fat, and bone tissue.

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    Main Results:

    • Monozygotic (MZ) twins showed smaller intrapair differences than dizygotic (DZ) twins for total area, muscle, fat, and bone.
    • Significant genetic influence was observed for bone tissue (6.7% MZ vs. 31.3% DZ intrapair difference).
    • Fat tissue also demonstrated notable genetic influence (13.9% MZ vs. 32.0% DZ), while muscle and total area showed less pronounced genetic effects.

    Conclusions:

    • Interindividual variations in bone tissue are predominantly attributable to genetic differences in adolescent males.
    • Body composition, particularly bone density, has a significant genetic component.
    • Environmental factors likely play a larger role in variations of muscle and fat tissue compared to bone.