The FG syndrome from a pathological perspective.

Area of Science:

• Genetics
• Neurology
• Pediatrics

Background:

• FG syndrome is a rare genetic disorder characterized by intellectual disability, developmental delay, and distinctive facial features.
• Genetic mutations, particularly in the MED12 gene, have been implicated in FG syndrome, but the genetic basis remains incompletely understood.
• Post-mortem diagnosis can be challenging but crucial for understanding the full spectrum of a genetic disorder.

Observation:

• A case of FG syndrome in a nearly 6-year-old boy diagnosed post-mortem.
• The boy exhibited intellectual and behavioral phenotypes described by his mother.
• The mother presented with mild manifestations, including a symptomatic tethered cord, suggesting carrier status.

Findings:

• Clinical diagnosis of FG syndrome was established through autopsy findings and maternal phenotype description.
• The mother's mild symptoms and tethered cord indicated her carrier status for the mutation.
• The propositus's phenotype did not support involvement of the MED12 gene, suggesting alternative genetic causes.

Implications:

• This case expands the understanding of FG syndrome's clinical presentation and diagnostic possibilities.
• It highlights the importance of detailed clinical history and autopsy in diagnosing rare genetic syndromes.
• Identifying non-MED12 related FG syndrome cases is crucial for further genetic research and potential therapeutic targets.