Analysis of the CHN1 gene in patients with various types of congenital ocular motility disorders

  • Alexander E. Volk
  • Julia Fricke
  • Judith Strobl
  • Gerold Kolling
  • Christian Kubisch
  • Antje Neugebauer
Genetics
First Online:
Received:
Revised:
Accepted:

Abstract

Background

Mutations in the gene CHN1 have been described in autosomal dominant Duane’s retraction syndrome (DRS) and mutations have been shown to interfere with normal innervation of target eye muscles by oculomotor axons in chick embryos. We screened for CHN1 mutations in patients with various congenital ocular motility disorders.

Methods

Altogether, 29 patients with different congenital ocular motility disorders and a positive family history of congenital ocular motility disturbances or strabismus or bilateral affection or accompanying congenital disorders were enrolled in this study. DNA samples of patients suffering from DRS (n = 5), Brown syndrome (n = 13), other congenital motility disorders of the oblique eye muscles (n = 6), double elevator palsy (n = 4), and vertical retraction syndrome (n = 1) were investigated by direct sequencing of all coding exons of CHN1.

Results

In the families of our index patients with DRS, other family members displayed DRS, see-saw nystagmus, infantile esotropia, microtropia, or Brown syndrome, respectively. In the families of our patients with cases of Brown syndrome, bilateral abduction deficiency, infantile esotropia, and unspecified strabismus occurred. The patients with congenital disorders of the oblique muscles and with congenital elevation deficiencies other than Brown syndrome had relatives with ptosis, infantile esotropia, DRS, congenital abduction deficiency, and unspecified forms of strabismus. Thus a considerable intrafamilial overlap between different types of congenital forms of motility disorders and strabismus does exist. No mutations were detected in the CHN1 gene in our patients. In addition to known polymorphisms, we identified four novel heterozygous single-nucleotide substitutions, one in the 5′UTR, two in intronic regions, and one in the coding region leading to a synonymous amino acid substitution.

Conclusions

We found no evidence for a causative involvement of CHN1 mutations in congenital ocular motor anomalies different from autosomal dominant Duane’s retraction syndrome and provide further evidence for genetic heterogeneity in familial forms of DRS.

Keywords

CHN1 Duane’s retraction syndrome CCDD Congenital ocular motility disorders 
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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Alexander E. Volk
    • 1
    • 2
    • 3
  • Julia Fricke
    • 4
  • Judith Strobl
    • 4
  • Gerold Kolling
    • 5
  • Christian Kubisch
    • 1
    • 2
    • 3
  • Antje Neugebauer
    • 4
  1. 1.Institute of Human GeneticsUniversity Hospital of CologneCologneGermany
  2. 2.Institute for GeneticsUniversity of CologneCologneGermany
  3. 3.Center for Molecular Medicine CologneUniversity of CologneCologneGermany
  4. 4.Department of OphthalmologyUniversity Hospital of CologneCologneGermany
  5. 5.Department of OphthalmologyHeidelberg University HospitalHeidelbergGermany

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