Germline KRAS and BRAF mutations in cardio-facio-cutaneous syndrome

Area of Science:

• Genetics
• Molecular Biology
• Developmental Biology

Background:

• Cardio-facio-cutaneous (CFC) syndrome presents with characteristic facial features, cardiac anomalies, and intellectual disability.
• CFC syndrome exhibits phenotypic overlap with Noonan syndrome and Costello syndrome.
• Noonan and Costello syndromes are linked to mutations in PTPN11 and HRAS genes, respectively.

Purpose of the Study:

• To investigate the genetic underpinnings of Cardio-facio-cutaneous (CFC) syndrome.
• To explore the molecular relationship between CFC, Noonan, and Costello syndromes.

Main Methods:

• Genetic analysis of 43 individuals diagnosed with CFC syndrome.
• Identification and sequencing of mutations in key genes within the RAS-RAF-ERK pathway.

Main Results:

• Two heterozygous KRAS mutations were identified in three individuals with CFC syndrome.
• Eight BRAF mutations were found in 16 individuals with CFC syndrome.
• These findings suggest a significant role for KRAS and BRAF mutations in CFC syndrome.

Conclusions:

• Dysregulation of the RAS-RAF-ERK signaling pathway is a common molecular mechanism underlying CFC, Noonan, and Costello syndromes.
• Identifying mutations in KRAS and BRAF provides crucial insights into the pathogenesis of CFC syndrome.