Cerebellar Atrophy, Visual Impairment, And Psychomotor Retardation

Alternative Names

  • CAVIPMR
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WHO-ICD-10 version:2010

Diseases of the nervous system

Systemic atrophies primarily affecting the central nervous system

OMIM Number

616875

Mode of Inheritance

Autosomal recessive

Gene Map Locus

1p36.13

Description

CAVIPMR is a rare progressive neurodegenerative disorder characterized by cerebellar atrophy, truncal hypotonia, global developmental delay, scoliosis, diminished deep tendon reflexes, and ophthalmological abnormalities.  Patients may have dysmorphic facial features such as deep set eyes, retrognathia, a short philtrum, gingival hyperplasia, and microcephaly.  Patients may also suffer from intellectual disability and speech delay.  Symptoms of CAVIPMR usually present from birth.  The disease has so far been reported in only three families.

Diagnosis of the disorder can be made based on a genetic analysis of the EMC1 gene.  Treatment is currently restricted to managing symptoms.  Patients may benefit from physical therapy and educational aids.

Molecular Genetics

CAVIPMR follows an autosomal recessive pattern of inheritance.  The disorder is caused by mutations in the EMC1 gene, encoding an endoplasmic reticulum complex subunit.  So far, two homozygous missense mutations and a frameshift mutation in this gene have been found to result in the disorder.

Epidemiology in the Arab World

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Other Reports

Saudi Arabia

Harel et al. (2016) described two brothers with a neurodegenerative disorder.  The siblings (aged 12 and 10), were born to consanguineous parents from Saudi Arabia.  They both suffered from moderate global developmental delay and speech delay.  Both siblings had deep set eyes while the younger sibling also had retrognathia.  An ophthalmological exam of the younger sibling found esotropia, hyperopia, and astigmatism.  His MRI revealed cerebellar atrophy with a foreshortened corpus callosum.  He also suffered from truncal hypotonia.  Whole exome sequencing found a homozygous missense variant (c.2602G>A, p.Gly868Arg) in a conserved domain of the EMC1 gene.  

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