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GNAS-associated disorders of cutaneous ossification: two different clinical presentations

R J Schimmel1, S G M A Pasmans, M Xu

  • 1Department of Paediatric Dermatology and Allergology, Wilhelmina's Children Hospital, University Medical Center Utrecht, 3508 AB Utrecht, The Netherlands.

Bone
|November 11, 2009
PubMed

Insights

Progressive osseous heteroplasia (POH) and Albright Hereditary Osteodystrophy (AHO) are GNAS-related disorders. Novel mutations in GNAS cause varied ossification, impacting patients differently.

Area of Science:

  • Genetics
  • Developmental Biology
  • Connective Tissue Disorders

Background:

  • Progressive osseous heteroplasia (POH) is a rare genetic disorder characterized by dermal ossification in infancy and progressive ossification into deep connective tissue in childhood.
  • POH represents the severe end of a spectrum of GNAS gene-associated ossification disorders, including osteoma cutis and Albright Hereditary Osteodystrophy (AHO).

Observation:

  • Two girls presented with distinct clinical manifestations of GNAS-associated disorders of cutaneous ossification.
  • Each girl harbored a novel heterozygous inactivating mutation in the GNAS gene, highlighting genetic variability.
  • One patient exhibited POH with severe contractures and growth retardation due to deep connective tissue ossification, while the other presented with AHO and superficial ossification with minimal functional impairment.

Findings:

  • The study identified novel heterozygous inactivating mutations in the GNAS gene in two patients with differing clinical outcomes.
  • Clinical presentations ranged from severe POH with significant functional impairment to AHO with widespread superficial ossification and minimal impact.

Implications:

  • These findings underscore the variable expressivity of GNAS-associated ossification disorders.
  • Early diagnosis is crucial for genetic counseling and preventing iatrogenic harm in patients with these rare conditions.
  • Understanding GNAS mutations aids in diagnosing and managing these complex genetic disorders.

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