• 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

MPI is associated with autosomal recessive MPI-congenital disorder of glycosylation (CDG-Ib) (MedGen UID 400692).

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Invitae tests that include this gene:

MPI-CDG is a more common cause of congenital disorders of glycosylation, however, due to the overall rarity of these disorders, the percentage of cases attributed to pathogenic variants in MPI is unknown.

The MPI gene encodes the cytosolic enzyme, mannose phosphate isomerase (MPI). This enzyme converts fructose-6-phosphate to mannose-6-phosphate, that is required for N-glycosylation. This reaction is also important to generate mannose for O-mannosylation and glycosylphosphatidylinositol-anchor biosynthesis (PMID: 19862844).

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 in the transcript listed below. In addition, analysis covers the select non-coding variants specifically defined in the table below. Any variants that fall outside these regions are not analyzed. Any specific limitations in the analysis of these genes are also listed in the table below.

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
MPI NM_002435.2