Juvenile polyposis syndrome (JPS) is a rare, inherited disease characterized by the presence of hamartomatous polyps in the gastrointestinal tract, typically in the stomach, small intestine, colon, and rectum. Juvenile refers to the developmentally immature nature of the polyp, not the patient age of disease onset. Polyps may cause gastrointestinal bleeding, abdominal pain and anemia. A diagnosis is made when an individual has any number of polyps and an affected family member, more than five polyps in the rectum or colon, or juvenile polyps in other parts of the gastrointestinal tract. In addition to polyposis, 10-20% of JPS patients also have extracolonic abnormalities such as congenital heart defects, cleft lip or palate, microcephaly and malrotations. These hamartomatous gastrointestinal polyps turn into malignant lesions (colorectal cancer) in approximately 20% of cases. A combined syndrome of JPS and hereditary hemorrhagic telangiectasia may be present in about 20% of individuals with a SMAD4 mutation. The most common clinical symptom of hereditary hemorrhagic telangiectasia is spontaneous and recurrent nosebleeds. JPS occurs in approximately 1 in 100,000 individuals.
Bidirectional sequencing is performed on the coding exons of the BMPR1A (exons 3-13) and SMAD4 genes (exons 1-11), along with 20 bp of intron flanking each exon.
|Clinical Utility:||- Confirmation of a clinical diagnosis of JPS or HHT.
- Identification of family members at-risk for JPS.
- Prenatal diagnosis in families with a known mutation.
|Method:||PCR Amplification followed by Capillary Sequencing|
|Test ID:||2005, 2006|
|Turn-around Time:||2 Weeks|
|Preferred Specimen:||Blood (2-5 mL whole blood in lavender top tube (EDTA)). Also accept buccal swabs.
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|Billing Information:||View Billing Information|