Intrafamilial variation in Cohen syndrome

Area of Science:

• Genetics
• Pediatrics
• Clinical Medicine

Background:

• Cohen syndrome is a rare genetic disorder characterized by intellectual disability, hypotonia, and distinctive facial dysmorphia.
• Previous research indicates a spectrum of clinical manifestations, but intrafamilial variability requires further elucidation.

Purpose of the Study:

• To describe the clinical presentation of three siblings diagnosed with Cohen syndrome.
• To illustrate the intrafamilial variability in phenotypic expression and behavioral characteristics within Cohen syndrome.

Main Methods:

• Case series presentation of three affected siblings.
• Clinical observation and documentation of physical and behavioral phenotypes.

Main Results:

• All three siblings exhibited intellectual disability, hypotonia, and characteristic facial features (short philtrum, open mouth, prominent lips).
• The older two siblings shared similar facial features and personality traits.
• The youngest sibling presented with a distinct facial appearance and significant behavioral issues, indicating intrafamilial variability.

Conclusions:

• Cohen syndrome exhibits considerable intrafamilial variability in both physical and behavioral phenotypes.
• Detailed case studies are crucial for understanding the full spectrum of Cohen syndrome and guiding clinical management.