Mucolipidosis IV

Mucolipidosis IV (MLIV) is a progressive neurological lysosomal storage disease that usually is evident during the first year of life, and presents with mental retardation, corneal opacities, and delayed developmental milestones. Ocular findings also include retinal degeneration, myopia, strabismus, and photophobia. Neurological symptoms include hypotonia and pyramidal tract signs. There are cytoplasmic inclusions (“storage bodies”) in almost every cell type of the patients. Most affected individuals reach a maximal developmental age of 12-15 months. Mucolipidosis IV is due to mutations in the MCOLN1 gene and more than 80% of reported patients are of Ashkenazi Jewish descent. Two common mutations (IVS3-2 A>G and a 6,450bp deletion) account for 95% of cases in the Ashkenazi Jewish population. MLIV is rare in the general population.

Tests Available

Forms and Documents

Test Details

  • Confirmation of a clinical diagnosis
  • Carrier testing in unaffected family members
  • Prenatal diagnosis


4 weeks
2-5 mL Blood - Lavender Top Tube
Buccal Swabs

*Reporting times are typical, but could be extended in situations outside GeneDx's reasonable control.


81290x1, 81479x1
  • 272.7 Lipidoses (Fabry Disease)
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**The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.


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  6. Bargal (2001) Hum Mutat 17:397-402
  7. Slaugenhaupt (2002) Curr Molec Med 2:445-450