EMC1

Cerebellar Atrophy, Visual Impairment, and Psychomotor Retardation

Clinical Characteristics
Ocular Features: 

Patients usually have deep-set eyes.  Cortical visual impairment has been described in one patient but optic atrophy has been seen in another.  The VEP and ERG are described as 'abnormal'.  Strabismus, hyperopia, and myopia are sometimes seen.

Systemic Features: 

Progressive microcephaly is often noted.  Truncal hypotonia and scoliosis may be present while muscle tone is increased in the extremities in the presence of diminished deep tendon reflexes in other patients.  Dystonic posturing occurs in some families.  Gingival hyperplasia is a common feature and retrognathia is often present.

Brain imaging reveals progressive cerebellar atrophy and a foreshortened corpus callosum in all families.  Various degrees of cerebral atrophy have been identified while intellectual disability may be marked.  Speech delay is common.

Genetics

This is an autosomal recessive condition associated with homozygous mutations in the EMC1 gene (1p36.13).

Pedigree: 
Autosomal recessive
Treatment
Treatment Options: 

No treatnent has been reported.

References
Article Title: 

Monoallelic and Biallelic Variants in EMC1 Identified in Individuals with Global Developmental Delay, Hypotonia, Scoliosis, and Cerebellar Atrophy

Harel T, Yesil G, Bayram Y, Coban-Akdemir Z, Charng WL, Karaca E, Al Asmari A, Eldomery MK, Hunter JV, Jhangiani SN, Rosenfeld JA, Pehlivan D, El-Hattab AW, Saleh MA, LeDuc CA, Muzny D, Boerwinkle E; Baylor-Hopkins Center for Mendelian Genomics, Gibbs RA, Chung WK, Yang Y, Belmont JW, Lupski JR. Monoallelic and Biallelic Variants in EMC1 Identified in Individuals with Global Developmental Delay, Hypotonia, Scoliosis, and Cerebellar Atrophy. Am J Hum Genet. 2016 Mar 3;98(3):562-70.

PubMed ID: 
26942288
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