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Genetic associations between lateral signs.

M Reiss1

  • 1Klinik für Hals-, Nasen- und Ohrenheilkunde, Universitätsklinikum der Technischen Universität, Dresden.

Anthropologischer Anzeiger; Bericht Uber Die Biologisch-Anthropologische Literatur
|May 13, 1999
PubMed
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This study on human lateralities found that traits like handedness often run in families, with left-sidedness increasing if parents are left-sided. However, genetic links between different lateralities are imperfect, suggesting complex inheritance.

Area of Science:

  • Human genetics
  • Behavioral neuroscience
  • Anthropometry

Background:

  • Simultaneous examination of multiple lateral asymmetries within families is rare.
  • Understanding familial patterns of lateralization is crucial for genetic and developmental studies.

Purpose of the Study:

  • To investigate familial associations across seven lateralities: handedness, footedness, eyedness, earedness, hand clasping, arm folding, and leg crossing.
  • To explore inter-relationships among these lateralities within a family context.
  • To analyze the genetic correlation between these lateralized characteristics.

Main Methods:

  • Studied 292 parent-offspring triads and 36 sibling pairs.
  • Analyzed familial data for significant associations in lateralities.

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  • Applied genetic linkage analysis (McManus & Mascie-Taylor, 1979) to assess inter-laterality correlations.

    • Main Results:

    • Significant parent-child associations were found for most lateralities.
    • Left-sidedness frequency correlated positively with the number of left-sided parents.
    • Footedness and hand clasping showed no significant familial correlations.
    • Functional asymmetries exhibited stronger inter-relationships in the parental generation.
    • Genetic correlations between different lateral asymmetries were imperfect.

    Conclusions:

    • Human laterality demonstrates significant familial aggregation for most traits.
    • Laterality is likely determined by multiple genes and environmental factors (multifactorial determination).
    • The imperfect genetic correlation suggests distinct genetic underpinnings for different lateral asymmetries.