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Alpha-Mannosidosis via the MAN2B1 Gene

Summary and Pricing

Test Method

Sequencing and CNV Detection via NextGen Sequencing using PG-Select Capture Probes
Test Code Test Copy GenesTest CPT Code Gene CPT Codes Copy CPT Codes Base Price
MAN2B1 81479 81479,81479 $990
Test Code Test Copy Genes Test CPT Code Gene CPT Codes Copy CPT Code Base Price
7901MAN2B181479 81479,81479 $990 Order Options and Pricing

Pricing Comments

Testing run on PG-select capture probes includes CNV analysis for the gene(s) on the panel but does not permit the optional add on of exome-wide CNV analysis. Any of the NGS platforms allow reflex to other clinically relevant genes, up to whole exome or whole genome sequencing depending upon the base platform selected for the initial test.

An additional 25% charge will be applied to STAT orders. STAT orders are prioritized throughout the testing process.

This test is also offered via a custom panel (click here) on our exome or genome backbone which permits the optional add on of exome-wide CNV or genome-wide SV analysis.

Turnaround Time

3 weeks on average for standard orders or 2 weeks on average for STAT orders.

Please note: Once the testing process begins, an Estimated Report Date (ERD) range will be displayed in the portal. This is the most accurate prediction of when your report will be complete and may differ from the average TAT published on our website. About 85% of our tests will be reported within or before the ERD range. We will notify you of significant delays or holds which will impact the ERD. Learn more about turnaround times here.

Targeted Testing

For ordering sequencing of targeted known variants, go to our Targeted Variants page.


Genetic Counselors


  • McKenna Kyriss, PhD

Clinical Features and Genetics

Clinical Features

Alpha-mannosidosis (OMIM# 248500) is an inheritable lysosomal storage disorder characterized by facial and skeletal abnormalities, hearing impairment, immune deficiency, and intellectual disability (Malm et al. Orphanet J Rare Dis 3:21, 2008; Malm et al. GeneReviews, 2001). Neurological abnormalities include gradual impairment of mental functions and speech, motor function disturbances and periods of psychiatric symptoms. Minor features include ocular changes and hepatosplenomegaly. After a normal birth, clinical symptoms develop progressively and the severity is markedly variable from early death to an asymptomatic form in adulthood. Diagnosis of the disease is made by measuring acid alpha-mannosidase activity in leukocytes or other nucleated cells.


Alpha-mannosidosis is an autosomal recessive disorder caused by deficiency of lysosomal alpha-mannosidase encoded by the MAN2B1 gene (Berg et al. Am J Hum Genet 64:77-88, 1999). Lysosomal alpha-mannosidase is required for the catabolism of N-linked carbohydrates released during glycoprotein turnover in the lysosomes. Genetic aberrations throughout the MAN2B1 gene include missense, nonsense, splicing mutations and small deletion/insertions. Large deletions within the MAN2B1 gene have also been reported but are relatively uncommon (Human Gene Mutation Database). Most mutations are private. The missense mutation c.2248C>T (p.Arg750Trp) in exon 18, accounting for more than 30% of pathogenic alleles, is most frequent among Alpha-mannosidosis patients in European populations (Berg et al. Am J Hum Genet 64:77-88, 1999; Malm et al., 2008).

Clinical Sensitivity - Sequencing with CNV PG-Select

DNA sequencing can detect 98% of disease-causing MAN2B1 mutations in patients who have been subjected to biochemical pre-screening (Nilssen et al. Eur J Hum Genet 19(7), 2011).

Testing Strategy

This test provides full coverage of all coding exons of the MAN2B1 gene, plus ~10 bases of flanking noncoding DNA. We define full coverage as >20X NGS reads or Sanger sequencing.

Indications for Test

Candidates for this test are patients with alpha-mannosidosis. Testing is also indicated for family members of patients who have known MAN2B1 mutations. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in MAN2B1.


Official Gene Symbol OMIM ID
MAN2B1 609458
Inheritance Abbreviation
Autosomal Dominant AD
Autosomal Recessive AR
X-Linked XL
Mitochondrial MT


Name Inheritance OMIM ID
Deficiency Of Alpha-Mannosidase AR 248500


  • Berg, T. et al. (1999). “Spectrum of mutations in alpha-mannosidosis.” Am J Hum Genet 64(1):77-88. PubMed ID: 9915946
  • Human Gene Mutation Database (Bio-base).
  • Malm, D. et al. (2001). “Alpha-mannosidosis.” GeneReviews. PubMed ID: 20301570
  • Malm, D. et al. (2008). “Alpha-mannosidosis.” Orphanet J Rare Dis 3:21. PubMed ID: 18651971
  • Nilssen, Ø. et al. (2011). “Clinical utility gene card for: α-mannosidosis.” Eur J Hum Genet 19(7). PubMed ID: 21368911


Ordering Options

We offer several options when ordering sequencing tests. For more information on these options, see our Ordering Instructions page. To view available options, click on the Order Options button within the test description.

myPrevent - Online Ordering

  • The test can be added to your online orders in the Summary and Pricing section.
  • Once the test has been added log in to myPrevent to fill out an online requisition form.
  • PGnome sequencing panels can be ordered via the myPrevent portal only at this time.

Requisition Form

  • A completed requisition form must accompany all specimens.
  • Billing information along with specimen and shipping instructions are within the requisition form.
  • All testing must be ordered by a qualified healthcare provider.

For Requisition Forms, visit our Forms page

If ordering a Duo or Trio test, the proband and all comparator samples are required to initiate testing. If we do not receive all required samples for the test ordered within 21 days, we will convert the order to the most effective testing strategy with the samples available. Prior authorization and/or billing in place may be impacted by a change in test code.

Specimen Types

Specimen Requirements and Shipping Details

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View Ordering Instructions

1) Select Test Method (Platform)

1) Select Test Type

2) Select Additional Test Options

No Additional Test Options are available for this test.

Note: acceptable specimen types are whole blood and DNA from whole blood only.
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