dysmetric vertical eye movements

Spinocerebellar Ataxia 37

Clinical Characteristics
Ocular Features: 

 Abnormal ocular movements are common, beginning with dysmetric vertical saccades and irregularities of vertical pursuit, with later development of irregular horizontal tracking movements.  Nystagmus is sometimes present. 

Two otherwise asymptomatic individuals with dysmetric vertical saccades and irregular vertical pursuit movements had normal horizontal pursuit movements at the ages of 32 and 40 years and were found to have the SCA37 haplotype.   

Systemic Features: 

The mean age of onset in is about 50 years with signs of dysarthria and a clumsy gait.  Other more variable findings include truncal ataxia, dysmetria, and sometimes dysphagia.  Slow progression of signs may lead to eventual wheelchair dependence within one or two decades of disease onset.  Brain imaging reveals cerebellar atrophy with sparing of the brainstem.

Genetics

Heterozygous mutations in the DAB1 gene (1p32.2) are responsible for this disorder.   This disorder of adult onset has been described in several families living on the Iberian peninsula.

Pedigree: 
Autosomal dominant
Treatment
Treatment Options: 

No effective treatment has been reported.

References
Article Title: 

A Pentanucleotide ATTTC Repeat Insertion in the Non-coding Region of DAB1, Mapping to SCA37, Causes Spinocerebellar Ataxia

Seixas AI, Loureiro JR, Costa C, Ordonez-Ugalde A, Marcelino H, Oliveira CL, Loureiro JL, Dhingra A, Brandao E, Cruz VT, Timoteo A, Quintans B, Rouleau GA, Rizzu P, Carracedo A, Bessa J, Heutink P, Sequeiros J, Sobrido MJ, Coutinho P, Silveira I. A Pentanucleotide ATTTC Repeat Insertion in the Non-coding Region of DAB1, Mapping to SCA37, Causes Spinocerebellar Ataxia. Am J Hum Genet. 2017 Jul 6;101(1):87-103.

PubMed ID: 
28686858
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