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Mucolipidosis Type IV (MLIV)
Mucolipidosis Type IV (MLIV) is a metabolic condition that affects the body's ability to process certain carbohydrates and fats. As a result, these materials accumulate in cells leading to the various signs and symptoms of the condition
Prevalence
0.03/100,000
100–120
US Estimated
<200
Europe Estimated
Age of Onset
ICD-10
E75.29
Inheritance
Autosomal dominant
Autosomal recessive
Mitochondrial/Multigenic
X-linked dominant
X-linked recessive
5 Facts you should know
FACT
Severe visual impairment is often the first observable sign, with corneal clouding, retinal degeneration, and achromatopsia frequently present by the first year of life
FACT
Motor and cognitive developmental delays are typically evident within the first 18 months, with most patients showing non-progressive intellectual disability and hypotonia
FACT
Neurodegeneration progresses slowly, with many individuals developing spasticity, movement disorders (e.g., dystonia), and loss of ambulation during adolescence or early adulthood
FACT
Gastrointestinal issues, particularly achlorhydria with iron deficiency anemia, are common and may be underrecognized, requiring routine monitoring and supplementation
FACT
Diagnosis is confirmed by detecting mutations in the MCOLN1 gene or through fibroblast studies showing enlarged lysosomes and lipid storage, with carrier screening available in high-risk populations (e.g., Ashkenazi Jewish descent)
Interest over time
Google searches
Common signs and symptoms
Severe developmental delay
Intellectual disability
Motor difficulties
Delayed or absent speech
Eye problems
Difficulty swallowing
Hyperreflexia
Abnormal nasal morphology
Current treatments
There is no cure for MLIV. Treatments are supportive and symptom-based:
Occupational and physical therapy
Vision aids and ophthalmologic care
Feeding support
feeding tubes if needed