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  3. Apical Ectodermal Ridge Disruption And Hypoplastic Digits In Amyoplasia.
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  3. Apical Ectodermal Ridge Disruption And Hypoplastic Digits In Amyoplasia.

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Apical Ectodermal Ridge Disruption and Hypoplastic Digits in Amyoplasia.

Amanda Stutman1, Natalie Williams1, Sarah Nossov1

  • 1Shriners Children's Philadelphia, Philadelphia, Pennsylvania, USA.

American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
|June 19, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Amyoplasia, a rare birth defect, may be linked to disruptions in the apical ectodermal ridge (AER). This finding suggests a potential new pathway for understanding limb malformations in affected infants.

Keywords:
Amyoplasiaapical ectodermal ridgearthrogryposis multiplex congenitahypodactylyhypoplasialimb budtransverse deficiency

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Area of Science:

  • Developmental Biology
  • Pediatric Orthopedics
  • Clinical Genetics

Background:

  • Amyoplasia's etiology is debated, with vascular disruption of anterior horn cells being a leading theory.
  • Disruption of the apical ectodermal ridge (AER) is exceptionally rare, contrasting with Amyoplasia's higher incidence.
  • Muscle precursor cell differentiation relies on AER-dependent signaling factors in the limb.

Purpose of the Study:

  • To investigate a potential association between apical ectodermal ridge (AER) disruption and Amyoplasia.
  • To explore if AER dysfunction contributes to the pathogenesis of Amyoplasia.
  • To identify characteristics of limb malformations in patients with Amyoplasia and hypodactyly.

Main Methods:

  • Retrospective review of 22 patients diagnosed with Amyoplasia and at least one hypoplastic digit.
  • Analysis of radiographs, clinical photographs, clinic notes, and operative reports.
  • Exclusion of five patients due to incomplete data or unconfirmed diagnoses.

    • Main Results:

    • Hypoplastic fingers were observed in 41% of cases, hypoplastic toes in 47%, and both in 6%.
    • Limb malformations included foot loss in 6% of patients.
    • No patient exhibited fully preserved ectoderm at amputation sites or evidence of amniotic bands.

    Conclusions:

    • Loss of AER function, leading to hypodactyly, may be a characteristic feature of Amyoplasia.
    • A potential causal or downstream association exists between AER loss and impaired muscle development.
    • This association offers a new perspective on the pathogenesis of Amyoplasia.