• Turnaround time:
    10–21 calendar days (14 days on average)
  • Preferred specimen:
    3mL whole blood in a purple-top tube
  • Alternate specimens:
    DNA or saliva/assisted saliva
  • Sample requirements
  • Request a sample kit

Associated disorders

The MPZ gene is associated with autosomal dominant Charcot-Marie-Tooth disease types 1B (CMT1B) (MedGen UID: 124377), 2I (CMT2I) (MedGen UID: 334363), 2J (CMT2J) (MedGen UID: 375107), and dominant intermediate Charcot-Marie-Tooth disease (DI-CMTD) (MedGen UID: 334318).

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Invitae tests that include this gene:

MPZ is a rare cause of CMT, and the percentage of cases attributed to pathogenic variants in MPZ is unknown.

The gene MPZ encodes the protein myelin protein zero. This protein is made by support cells of the peripheral nervous system and accounts for over half of the protein in the myelin sheath of the peripheral nerves.

Assay and technical information

Invitae is a College of American Pathologists (CAP)-accredited and Clinical Laboratory Improvement Amendments (CLIA)-certified clinical diagnostic laboratory performing full-gene sequencing and deletion/duplication analysis using next-generation sequencing technology (NGS).

Our sequence analysis covers clinically important regions of each gene, including coding exons, +/- 10 base pairs of adjacent intronic sequence, and select noncoding variants. Our assay provides a Q30 quality-adjusted mean coverage depth of 350x (50x minimum, or supplemented with additional analysis). Variants classified as pathogenic or likely pathogenic are confirmed with orthogonal methods, except individual variants that have high quality scores and previously validated in at least ten unrelated samples.

Our analysis detects most intragenic deletions and duplications at single exon resolution. However, in rare situations, single-exon copy number events may not be analyzed due to inherent sequence properties or isolated reduction in data quality. If you are requesting the detection of a specific single-exon copy number variation, please contact Client Services before placing your order.

Gene Transcript reference Sequencing analysis Deletion/Duplication analysis
MPZ NM_000530.6