| Interpretive Data: |
Background Information for Noonan Syndrome (PTPN11) Sequencing:
Characteristics of Noonan Syndrome (NS): Short stature, developmental delay, dysmorphic facial features, congenital heart disease, broad or webbed neck, superior pectus carinatum and inferior pectus excavatum, low set nipples, cryptorchidism, coagulation and lymphatic disorders.
Characteristics of LEOPARD syndrome: Lentigines, ECG abnormalities, ocular hypertelorism, pulmonary stenosis, abnormal genitalia, retardation of growth, and deafness.
Incidence: 1 in 1000 to 1 in 2500 for NS; rare for LEOPARD syndrome.
Inheritance: Autosomal dominant.
Penetrance: Unknown.
Cause of NS: Deleterious mutations in PTPN11, SOS1, RAF1, KRAS and other unidentified genes.
Cause of LEOPARD syndrome: Mutations in PTPN11 exons 7 and 12 as well as other unidentified genes.
Gene tested: PTPN11.
Clinical Sensitivity: 50 percent of NS is due to PTPN11 mutations; unknown for LEOPARD syndrome.
Methodology: Bidirectional sequencing of the entire PTPN11 coding region and intron-exon boundaries.
Analytical Sensitivity and Specificity: 99 percent.
Limitations: Rare diagnostic errors can occur due to primer site mutations. Regulatory region mutations, deep intronic mutations and large deletions/duplications will not be detected. Mutations in genes, other than PTPN11, will not be detected.
Counseling and informed consent are recommended for genetic testing. Consent forms are available online at www.aruplab.com.
Refer to Statement C under Testing Information at http://www.aruplab.com.
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| CPT Code(s): |
83891 Isolation; 83898 x15 Amplification; 83904 x15 Sequencing; 83909 Capillary electrophoresis; 83912 Interpretation and report - Additional CPT code modifiers may be required for procedures performed to test for oncologic or inherited disorders.
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Cross References: |
Leopard Syndrome (Noonan Syndrome (PTPN11) Sequencing)
, PTPN11 , Full Gene Sequence, Blood (Noonan Syndrome (PTPN11) Sequencing)
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