Familial Adenomatous Polyposis
Sequencing of the APC gene
Genes
(full coding
region): |
APC |
Specimen requirements: |
2-4 ml of blood with anticoagulant EDTA
2 µg DNA in TE, AE or pure sterile water at 100-250 ng/µl
The A260/A280 ratio should be 1.8-2.0. DNA sample should be run on an agarose gel as a single band, showing no degradation, alongside with a quantitative DNA marker. |
Del/dup analysis of the APC gene
Specimen requirements: |
2-4 ml of blood with anticoagulant EDTA
1 µg DNA in TE, AE or pure sterile water at 100-250 ng/µl
The A260/A280 ratio should be 1.8-2.0. DNA sample should be run on an agarose gel as a single band, showing no degradation, alongside with a quantitative DNA marker. |
Indications for mutation analysis:
1. Testing of individuals with adenomatous polyps
2. Testing of first degree relatives of the affected individuals
3. Genetic counseling
Familial adenomatous polyposis (FAP) is a colon cancer predisposition syndrome characterized by the early onset of hundreds to thousands of adenomatous polyps throughout the colon. By age 35, 95% of individuals with FAP have polyps. If left untreated, patients with this syndrome develop colon cancer by age 35-40. APC-associated polyposis conditions are inherited in an autosomal dominant manner.