Type : Phenotype or locus, molecular basis unknown;
Alternative titles and symbols : Duane syndrome; Retraction syndrome; DUS; Duane anomaly; DRS;
Description : Duane retraction syndrome is a congenital eye movement disorder characterized by a
failure of cranial nerve VI (the abducens nerve) to develop normally, resulting in
restriction or absence of abduction, adduction, or both, and narrowing of the palpebral
fissure and retraction of the globe on attempted adduction. Undiagnosed in children,
it can lead to amblyopia, a permanent uncorrectable loss of vision (Appukuttan et
al., 1999). - Genetic Heterogeneity of Duane Retraction Syndrome Duane retraction
syndrome-1 (DURS1) maps to chromosome 8q13. Duane retraction syndrome-2 (DURS2; 604356)
is caused by mutation in the CHN1 gene (118423) on chromosome 2q31.;