Monozygotic twins with Apert syndrome

Area of Science:

• Genetics
• Developmental Biology
• Medical Case Reports

Background:

• Apert syndrome is a genetic disorder primarily caused by specific point mutations in the fibroblast growth factor receptor 2 (FGFR2) gene.
• It typically follows an autosomal dominant inheritance pattern, with most cases arising from new mutations.
• Twinning in Apert syndrome is rare, with limited documented cases in scientific literature.

Observation:

• This report presents a unique case of monozygotic twins diagnosed with Apert syndrome.
• Both twins were confirmed to carry the Ser252Trp mutation in the FGFR2 gene.
• Despite the shared genetic mutation, the twins displayed notable differences in their craniofacial and hand malformations.

Findings:

• The monozygotic twins exhibited variable expressivity of Apert syndrome, a condition usually associated with syndromic craniosynostosis.
• One twin presented with metopic synostosis, contrasting with the typical Apert syndrome phenotype of a delayed metopic suture closure.
• The study highlights the phenotypic variability even in genetically identical individuals with Apert syndrome.

Implications:

• This case underscores the complex interplay between genetics and environmental factors in determining phenotypic outcomes in Apert syndrome.
• Understanding such variability is crucial for accurate diagnosis, genetic counseling, and personalized treatment strategies for affected families.
• Further research into the mechanisms underlying differential gene expression and developmental pathways in monozygotic twins with Apert syndrome is warranted.