PPM-X Syndrome (MECP2 Single Gene Test)

Panel Description

This is a next generation sequencing (NGS) test appropriate for individuals with clinical signs and symptoms, suspicion of, or family history of PPM-X Syndrome. Sequence variants and/or copy number variants (deletions/duplications) within the MECP2 gene will be detected with >99% sensitivity. Variants classified as unknown significance (VUS), likely pathogenic, or pathogenic will be reported. Benign and likely benign variants are generally not reported. Reflex to clinical exome ("All-in-One") and whole exome ("Whole-in-One") is available by request.

Test Description

Order Options:

Sequencing
Del/Dup
Rush / STAT
Exclude VUS
MCC
Duo/Trio

Turnaround Time:

3 - 5 weeks

Cost:

Call for details

Genes:

MECP2 ( 1 gene )

Coverage:

99.9% at 20x

Specimen Requirements:

Blood (two 4ml EDTA tubes, lavender top) or Extracted DNA (3ug in EB buffer) or Buccal Swab or Saliva (kits available upon request)

Test Limitations:

All sequencing technologies have limitations. This analysis is performed by Next Generation Sequencing (NGS) and is designed to examine coding regions and splicing junctions. Although next generation sequencing technologies and our bioinformatics analysis significantly reduce the contribution of pseudogene sequences or other highly-homologous sequences, these may still occasionally interfere with the technical ability of the assay to identify pathogenic variant alleles in both sequencing and deletion/duplication analyses. Sanger sequencing is used to confirm variants with low quality scores and to meet coverage standards. If ordered, deletion/duplication analysis can identify alterations of genomic regions which include one whole gene (buccal swab specimens and whole blood specimens) and are two or more contiguous exons in size (whole blood specimens only); single exon deletions or duplications may occasionally be identified, but are not routinely detected by this test. Identified putative deletions or duplications are confirmed by an orthogonal method (qPCR or MLPA). This assay will not detect certain types of genomic alterations which may cause disease such as, but not limited to, translocations or inversions, repeat expansions (eg. trinucleotides or hexanucleotides), alterations in most regulatory regions (promoter regions) or deep intronic regions (greater than 20bp from an exon). This assay is not designed or validated for the detection of somatic mosaicism or somatic mutations.

Gene Specifics:

Gene	Notes
MECP2	Currently available technologies (NGS and qPCR) are not amenable to detection of single exon deletions/duplications of exon 1 in the MECP2 gene.

CPT Codes:

CPT Code

81302, 81304

NOTE: The CPT codes listed on the website are in accordance with Current Procedural Terminology, a publication of the American Medical Association. CPT codes are provided here for the convenience of our clients. Clients who bill for services should make the final decision on which codes to use.