Clinical Report: Identification of a New Fibrillin-2 Variant in CCA Family

Overview

This study identifies a novel heterozygous missense variant in FBN2 associated with congenital contractural arachnodactyly (CCA) in a family across three generations. The findings enhance the understanding of genetic variations linked to CCA and support genetic counseling efforts.

Background

Congenital contractural arachnodactyly (CCA) is a rare autosomal dominant connective tissue disorder primarily caused by mutations in the FBN2 gene. Accurate diagnosis is crucial due to its clinical overlap with other conditions like Marfan syndrome, which complicates management and prognosis. Genetic screening is essential for confirming CCA and guiding clinical decisions.

Data Highlights

A novel heterozygous missense variant in FBN2 (NM_001999.4: c.3916T > G, p.Y1306D) was identified in a CCA family.

Key Findings

• Affected individuals exhibited phenotypic features including arachnodactyly and joint contractures.
• The identified FBN2 variant was classified as “likely pathogenic” based on ACMG guidelines.
• Bioinformatics analysis indicated alterations in protein structure and function due to the variant.
• FBN2 is the only known causative gene for CCA, highlighting its clinical significance.
• Phenotypic diversity in CCA complicates diagnosis and necessitates genetic testing.

Clinical Implications

Clinicians should consider genetic screening for FBN2 mutations in patients presenting with features of CCA, especially given the phenotypic overlap with Marfan syndrome. Understanding the genetic basis of CCA can improve diagnostic accuracy and inform family counseling.

Conclusion

The identification of a novel FBN2 variant contributes to the expanding knowledge of genetic factors in CCA and underscores the importance of genetic testing in affected families.

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