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Brachmann-de Lange syndrome with normal IQ
H M Saal1, C A Samango-Sprouse, L A Rodnan
1Department of Medical Genetics, Children's National Medical Center, Washington, DC 20010.
American Journal of Medical Genetics
|November 15, 1993
Summary
Brachmann-de Lange syndrome typically involves intellectual disability, but this report details the eighth case with normal intelligence. Key indicators for normal intelligence in Brachmann-de Lange syndrome include normal birth weight and no major limb abnormalities.
Area of Science:
- Genetics and Developmental Disorders
- Clinical Case Studies
- Human Physiology
Background:
- Brachmann-de Lange syndrome (BDS) is a rare genetic disorder characterized by significant clinical heterogeneity.
- The syndrome is typically associated with moderate to severe intellectual disability.
- Previous literature documented only 7 cases of BDS with normal intelligence (IQ > 70).
Observation:
- This study presents the eighth documented case of Brachmann-de Lange syndrome occurring in an individual with normal intelligence.
- The patient exhibited a high IQ, deviating from the common presentation of the syndrome.
Findings:
- A review of the 8 documented cases of BDS with normal intelligence identified consistent clinical features.
- Absence of significant limb anomalies and a birth weight exceeding 2,500 grams were noted as prognostic indicators.
- These findings suggest specific clinical markers may predict intellectual outcomes in BDS.
Implications:
- This case and literature review contribute to a better understanding of the phenotypic variability within Brachmann-de Lange syndrome.
- Identifying prognostic indicators can aid in earlier diagnosis and more accurate genetic counseling for affected families.
- Further research into the genetic and molecular underpinnings of normal intelligence in BDS is warranted.