Nine novel APC mutations in Italian FAP patients

Area of Science:

• Genetics
• Oncology
• Molecular Biology

Background:

• Familial adenomatous polyposis (FAP) is an inherited condition leading to colorectal cancer.
• FAP involves numerous colon polyps and extracolonic manifestations.

Purpose of the Study:

• To analyze the APC gene's coding region for mutations in Italian FAP patients.
• To identify novel APC mutations and their potential impact on FAP development.

Main Methods:

• Screening of the APC gene using Single-Strand Conformation Polymorphism (SSCP) analysis, Protein Truncation Test (PTT), and DNA sequencing.
• Analysis of a cohort including one Turcot syndrome patient and 33 unrelated FAP patients.

Main Results:

• Mutations in the APC gene were detected in 23 out of 34 patients.
• Nine novel APC mutations were identified, all located in exon 15.
• These included two nonsense mutations, six frameshift mutations (deletions/insertions), and one missense mutation (7697G>A).
• The missense mutation affects the EB1-binding domain and was observed in relatives with adenomatous polyps.

Conclusions:

• The study identified several new APC mutations associated with Familial Adenomatous Polyposis.
• These findings contribute to the genetic understanding of FAP and its associated pathologies.
• The novel mutations, particularly the missense mutation in the EB1-binding domain, warrant further investigation into their functional consequences.