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Related Experiment Videos

Phenotypic variability in Meckel-Gruber syndrome.

T I Farag1, R Usha, R Uma

  • 1Kuwait Medical Genetics Centre, Paediatric Department.

Clinical Genetics
|September 1, 1990
PubMed
Summary

Meckel-Gruber syndrome (MGS) in five Bedouin siblings showed variable expression, presenting with occipital encephalocele and polycystic kidneys but lacking polydactyly. This highlights the MGS gene

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Area of Science:

  • Genetics
  • Medical Genetics
  • Developmental Biology

Background:

  • Meckel-Gruber syndrome (MGS) is an autosomal recessive developmental disorder.
  • MGS is characterized by a triad of major congenital anomalies: occipital encephalocele, cystic kidneys, and postaxial polydactyly.

Observation:

  • This study describes five Bedouin siblings affected by Meckel-Gruber syndrome.
  • All affected siblings presented with occipital encephalocele and polycystic kidneys.
  • Notably, polydactyly was absent in all affected individuals.

Findings:

  • The cardinal signs of MGS exhibited significant phenotypic variability within this family.
  • The observed presentation suggests that not all three classic MGS features are consistently present.
  • This challenges the traditional diagnostic criteria based on the triad of symptoms.

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Implications:

  • Understanding MGS phenotypic variability is crucial for accurate diagnosis and genetic counseling.
  • The findings emphasize the importance of considering genetic heterogeneity and variable expressivity in MGS.
  • Further research into the MGS pleiotropic gene may elucidate mechanisms underlying its diverse manifestations.