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Related Experiment Videos

Cardiovascular malformations in Smith-Lemli-Opitz syndrome

A E Lin1, H H Ardinger, R H Ardinger

  • 1Department of Pediatrics University of Kansas, Kansas City, USA.

American Journal of Medical Genetics
|January 31, 1997
PubMed
Summary

Smith-Lemli-Opitz syndrome (SLOS) is linked to cardiovascular malformations (CVMs) in 44% of patients. The study classifies CVMs by embryonic mechanisms, revealing specific patterns in SLOS that impact cardiac development.

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Area of Science:

  • Genetics
  • Developmental Biology
  • Cardiology

Background:

  • Smith-Lemli-Opitz syndrome (SLOS) is a genetic disorder with a complex phenotype.
  • Cardiovascular malformations (CVMs) are a significant concern in SLOS patients.
  • Understanding the mechanisms of CVMs in SLOS is crucial for clinical management and research.

Purpose of the Study:

  • To investigate the types and frequencies of CVMs in patients with Smith-Lemli-Opitz syndrome.
  • To classify CVMs based on underlying embryonic developmental mechanisms.
  • To compare CVM frequencies in SLOS with a control population to identify specific developmental alterations.

Main Methods:

  • Retrospective review of 215 patients with SLOS (59 new, 156 literature-based).
  • Classification of CVMs according to five established embryonic mechanism categories.

Related Experiment Videos

  • Statistical comparison of CVM frequencies in SLOS patients against the Baltimore-Washington Infant Study control group.

    • Main Results:

    • 44% of SLOS patients exhibited CVMs.
    • Class II (abnormal intracardiac blood flow) CVMs were most common (58.9%).
    • Classes IV (abnormal extracellular matrix) and V (abnormal targeted growth) CVMs were significantly more frequent in SLOS compared to controls, while Class I (ectomesenchymal tissue migration) was less frequent.

    Conclusions:

    • CVMs in SLOS exhibit mechanistic heterogeneity, with a predominance of Class II defects.
    • Developmental errors in SLOS appear to particularly affect mechanisms underlying atrioventricular canal defects and anomalous pulmonary venous return.
    • Findings aid clinical geneticists in evaluating SLOS patients and guide future research into SLOS-related developmental mechanisms.