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MLH1/MSH2/MSH6 Comprehensive Analysis
- Lynch Syndrome
This comprehensive test includes both Sanger sequencing and deletion/duplication analysis by MLPA of the MLH1, MSH2, and MSH6 genes. The sequencing portion of this test covers all coding nucleotides plus at least two and typically 20 flanking intronic nucleotides upstream and downstream of each coding exon, covering the conserved donor and acceptor splice sites, as well as typically 20 flanking nucleotides in the 5' and 3' UTR. The deletion/duplication analysis can detect single exon, multi-exon, and full gene deletions or duplications.
Can confirm a clinical diagnosis of HNPCC and allow early diagnosis in family members, guiding preventive measures. Hereditary nonpolyposis colorectal cancer (HNPCC) is an autosomal-dominant, genetically heterogeneous syndrome caused by heterozygous mutations in mismatch repair genes (MMR). HNPCC is estimated to account for 4% to 6% of colorectal cancer and is characterized by early onset, a predominant proximal location of colon cancer, multiple primary cancers, and significantly improved survival when compared stage for stage to sporadic colon cancer survival rates. HNPCC has been linked to mutations in the genes MLH1, MSH2, PMS2, and MSH6, which are involved in DNA mismatch repair. Genetic testing can confirm the diagnosis of HNPCC and can also identify presymptomatic individuals among the patient's relatives.
Sequencing cannot detect variants in regions not covered by this analysis, including noncoding or deep intronic variants and may not reliably detect changes in repetitive elements, such as microsatellite repeats. Sequencing may not detect mosaic variants, inversions, or other genomic rearrangements such as transposable element insertions. Sequence analysis may also be affected by allele drop-out due to the presence of a rare variant under a primer site or homopolymeric regions. The method does not allow any conclusion as to whether two heterozygous variants are present on the same or on different chromosome copies.
Copy number variations are assessed by multiple-ligation- probe amplification assay (MLPA) to detect gross deletions and duplications. Copy number analyses are designed to detect single exon, multi-exon, and full gene deletions or duplications. These analyses may not detect certain genomic rearrangements, such as translocations (balanced or unbalanced), inversions, or some partial exon rearrangements. This assay cannot determine exact breakpoints of deletions or duplications detected.
This test is not intended to detect somatic variants. Bone marrow transplantation, recent blood transfusion and active hematological malignancies may affect the outcome of these results. Please contact LabCorp to discuss testing options at 1-800-345-GENE.
This test was developed, and its performance characteristics determined, by LabCorp. It has not been cleared or approved by the US Food and Drug Administration (FDA).
DNA sequencing and multiplex ligation-dependent probe amplification (MLPA)
Lavender-top (EDTA) tube
Maintain specimen at room temperature.
Causes for Rejection
Container broken or leaking; container not labeled; improper anticoagulant
|Order Code||Order Code Name||Order Loinc||Result Code||Result Code Name||UofM||Result LOINC|
|511673||MLH1/MSH2/MSH6 Comprehensive||511662||Specimen Type||31208-2|
|511673||MLH1/MSH2/MSH6 Comprehensive||511664||Director Review||72486-4|