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Dysmorphic syndromes with demonstrable biochemical abnormalities.

P T Clayton1, E Thompson

  • 1Department of Child Health, Institute of Child Health, London.

Journal of Medical Genetics
|July 1, 1988
PubMed
Summary
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Inborn errors of metabolism can cause dysmorphic features by affecting macromolecule synthesis or degradation. This review explores the link between metabolic defects and physical manifestations, aiding understanding of dysmorphic syndromes.

Area of Science:

  • Biochemistry
  • Genetics
  • Pediatrics

Background:

  • Inborn errors of metabolism (IEMs) are frequently associated with distinct physical abnormalities, known as dysmorphic manifestations.
  • Understanding the biochemical basis of these features is crucial for diagnosis and management.

Purpose of the Study:

  • To review and correlate dysmorphic features observed in IEMs with their underlying metabolic defects.
  • To elucidate the relationship between biochemical abnormalities and their phenotypic consequences.

Main Methods:

  • Literature review of IEMs with associated dysmorphic features.
  • Analysis of defects affecting macromolecule synthesis/degradation (e.g., collagen, proteoglycans).
  • Inclusion of examples of defects in simple molecule catabolism with secondary effects on macromolecules.

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Main Results:

  • Many IEMs impact macromolecule synthesis or degradation, leading to dysmorphic features.
  • Defects can involve single or multiple enzymes in organelles (lysosomes, peroxisomes) or hormonal control.
  • Accumulating metabolites in certain IEMs (e.g., homocystinuria) can secondarily affect macromolecules.

Conclusions:

  • A biochemical defect or its consequences are ultimately responsible for all dysmorphic syndromes.
  • Current understanding provides insight into the biochemical basis of many dysmorphic features in IEMs.
  • Further research is needed to fully understand the biochemical-phenotypic correlations in all cases.