Multiple Endocrine Neoplasia Type 1: MEN1 Gene Deletion/Duplication

Condition Description

Multipleendocrine neoplasia type 1 (MEN1) is an autosomal dominant condition that includesa varying combination of more than 20 endocrine and non-endocrine tumors.Endocrine tumors associated with MEN1 include parathyroid tumors, pituitarytumors, well-differentiated endocrine tumors of the gastro-entero-pancreatic(GEP) tract, carcinoid tumors, and adrenocortical tumors. These tumors canbecome evident by overproduction of hormones by the tumor or by growth of thetumor itself. Non-endocrine tumors associated with MEN1 syndrome include facialangiofibromas, collagenomas, lipomas, meningiomas, ependymonas, and leiomyomas.

Parathyroidtumors are the main MEN1-associated endocrinopathy with onset in 90% ofindividuals at 20-25 years of age and manifest as hypercalcemia by age 50years. Prolactinoma is the most common pituitary tumor. GEP tract endocrinetumors include gastrinoma, insulinoma, glucagonoma, and VIPoma. Carcinoidtumors are non-hormone-secreting and manifest as a large mass after age 50years. Adrenocortical tumors are associated with primary hypercortisolism orhyperaldosteronism.

Approximately88% of affected individuals will have facial angiofibromas, which are benigntumors comprising blood vessels and connective tissue. These consist ofacneiform papules that do not regress and that may extend across the vermillionborder of the lips. Collagenomas are seen in about in 72% of affectedindividuals and are multiple, skin-colored, sometimes hypopigmented, cutaneiousnodules symmetrically arranged on the trunk, neck, and upper limbs. They aretypically asymptomatic, roundish, and firm-elastic, from a few millimeters toseveral centimeters in size.

Clinicaldiagnostic criteria for MEN1 include the presence of two endrocrine tumors thatare parathyroid, pituitary, or GEP tract tumors. Familial MEN1 is defined as MEN1 in an individual who has either at least one first-degreerelative with at least one of these endocrine tumors or only one organ involvement and an MEN1disease-causing germline mutation. Molecular genetictesting of MEN1(11q13), the only gene known to be associated with MEN1, detects MEN1 mutations in about 80-90%of probands with familial MEN1 and in about 65% of individuals with a single occurrence of MEN1 in thefamily. Approximately 10% of cases are caused by de novo mutations.

Click here for the GeneTests summary on this condition.

Genes (1)

Indications

This test is indicated for:

  • Confirmation of a clinical/biochemical diagnosis of MEN1 in individuals who have tested negative for sequence analysis
  • Individuals at-risk for MEN1 due to family history who have tested negative for sequence analysis

Methodology

DNA isolated from peripheral blood is hybridized to a CGH array to detect deletions and duplications. The targeted CGH array has overlapping probes which cover the entire genomic region.

Detection

Detection is limited to duplications and deletions. The CGH array will not detect point or intronic mutations. Results of molecular analysis must be interpreted in the context of the patient's clinical and/or biochemical phenotype.

Specimen Requirements

Listed below are EGL's preferred sample criteria. For any questions, please call 470.378.2200 and ask to speak with a laboratory genetic counselor (eglgc@egl-eurofins.com).
Submit only 1 of the following specimen types
DNA, Isolated
DNA

Requirements
Microtainer
3µg
Isolation using the Perkin Elmer™Chemagen™ Chemagen™ Automated Extraction method or Qiagen™ Puregene kit for DNA extraction is recommended.
Collection and Shipping
Refrigerate until time of shipment in 100 ng/µL in TE buffer. Ship sample at room temperature with overnight delivery.
Whole Blood (EDTA)
WBP

Requirements
EDTA (Purple Top)
Infants and Young Children (<2 years of age): 2-3 ml
Children > 2 years of age to 10 years old: 3-5 ml
Older Children & Adults: 5-10 ml
Autopsy: 2-3 ml unclotted cord or cardiac blood
Collection and Shipping
Ship sample at room temperature for receipt at EGL within 72 hours of collection. Do not freeze.

Special Instructions

Submit copies of diagnostic biochemical test results with the sample, if appropriate. Contact the laboratory if further information is needed.

Sequence analysis is required before deletion/duplication analysis by targeted CGH array. If sequencing is performed outside of EGL Genetics, please submit a copy of the sequencing report with the test requisition.

  • Sequencing analysis of the MEN1 gene is available (VQ) and is required before deletion/duplication analysis.
  • Prenataltesting is available to individuals who are confirmed carriers ofmutations. Please contact the laboratory genetic counselor to discussappropriate testing prior to collecting a prenatal specimen.

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