LEOPARD Syndrome with PTPN11 Gene Mutation in Three Family Members Presenting with Different Phenotypes

Area of Science:

• Genetics
• Molecular Biology
• Medical Genetics

Background:

• LEOPARD syndrome (LS) is a rare autosomal dominant disorder.
• LS presents with multiple lentigines and congenital anomalies.
• Molecular confirmation, often involving the PTPN11 gene, is crucial for diagnosis.

Observation:

• Three family members across two generations affected by LS were studied.
• Next-generation sequencing identified a shared PTPN11 mutation (c.836A>G, p.Tyr279Cys) in all affected individuals.
• Despite the identical mutation, the affected family members displayed distinct clinical phenotypes.

Findings:

• The PTPN11 gene mutation c.836A>G (p.Tyr279Cys) is confirmed as a cause of LEOPARD syndrome in this family.
• Phenotypic variability exists among individuals with the same PTPN11 mutation.
• This underscores the complexity of genotype-phenotype correlations in LS.

Implications:

• Understanding PTPN11 mutation spectrum is key for accurate LS diagnosis and genetic counseling.
• Further research into factors influencing LS phenotypic variability is warranted.
• Molecular diagnostics play a vital role in identifying and managing rare genetic disorders like LEOPARD syndrome.