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Related Experiment Videos

Primary megalencephaly at birth and low intelligence level.

S Petersson1, N L Pedersen, M Schalling

  • 1Neurogenetics Unit, Center for Molecular Medicine, Karolinska Institute, Stockholm, Sweden.

Neurology
|October 16, 1999
PubMed
Summary

Primary megalencephaly (PMG) at birth is linked to lower intelligence but not to vision or hearing issues. This condition shows moderate heritability, with mothers and children sharing similar head sizes at birth.

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Area of Science:

  • Pediatric Neurology
  • Developmental Biology
  • Genetics

Background:

  • Primary megalencephaly (PMG) is defined by head circumference above the 98th percentile, indicating brain enlargement not caused by disease.
  • Previous studies show conflicting associations between PMG and intelligence in children.
  • PMG may have a genetic component, with potential inheritance patterns observed in childhood and adulthood.

Purpose of the Study:

  • To investigate the relationship between primary megalencephaly at birth and psychosensory conditions.
  • To assess mother-child similarity for primary megalencephaly at birth.

Main Methods:

  • Utilized birth records of 144,273 boys, identifying 732 with PMG.
  • Linked PMG data with information on intelligence, mental retardation, and sensory impairments (vision, hearing).

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  • Examined parent-offspring similarity for PMG in 13,585 mother-child pairs.

    • Main Results:

    • PMG at birth was significantly associated with a lower intelligence level (OR, 1.32).
    • No significant association was found between PMG and mental retardation (OR, 1.31), or vision/hearing impairments.
    • A moderate heritability of head circumference and PMG was indicated by mother-child similarity (r=0.14 for HC, OR=2.55 for PMG).

    Conclusions:

    • Primary megalencephaly at birth serves as a risk factor for reduced intelligence.
    • PMG is not associated with increased risk for vision or hearing impairments.
    • Head circumference and PMG exhibit moderate heritability, suggesting a multifactorial inheritance pattern.