MECP2 Gene, Full Gene Analysis, Varies

Casandra

Casandra Test Code MC61332Version 1 (DRAFT)

Performing Lab

Lab Mayo Clinic LabLab Test ID MCP2ZCPT Codes 81302, 88233, 88240

MECP2 Gene, Full Gene Analysis, Varies

Clinical Use

Use

The MECP2 Gene, Full Gene Analysis test is crucial for establishing a molecular diagnosis in individuals showing features of Rett syndrome and related disorders. It helps in identifying pathogenic variants within the MECP2 gene that are associated with these disorders. This test is particularly beneficial for predictive testing in at-risk family members, offering insights into potential genetic predispositions. Furthermore, it assists in diagnosis, prognosis, clinical management, familial screening, recurrence risk assessment, and genetic counseling for those with Rett syndrome.

Special Instructions

The test involves next-generation sequencing to detect single nucleotide and copy number variants in the MECP2 gene. Reflex testing might include Fibroblast Culture for Genetic Test (CULFB) with additional charges. It requires informed consent for New York clients and specific specimen handling instructions, such as ensuring skin biopsy specimens are refrigerated.

Limitations

The test may not detect all genetic variants due to technical limitations of next-generation sequencing, such as regions with high guanine-cytosine content and repetitive sequences. It is validated to detect 95% of deletions up to 75 bp and insertions up to 47 bp, with limitations potentially affecting single exon resolution and balanced structural rearrangements. False-negative or false-positive results can occur, and mosaicism or differentiation between somatic and germline variants may not be detected.

Test Details

New York Approved