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Nightblindness-associated transient tonic downgaze (NATTD) in infant boys with chin-up head posture

H J Simonsz1, R J Florijn, H M van Minderhout

  • 1Molecular Ophthalmogenetics, Netherlands Institute for Neuroscience, Amsterdam. simonsz@compuserve.com

Strabismus
|December 17, 2009
PubMed

Insights

Congenital stationary night blindness (CSNB) in infant boys is linked to specific genetic mutations affecting vision and eye movement. These mutations cause abnormal eye movements and reduced visual acuity, impacting early visual development.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Genetics

Background:

  • Congenital stationary night blindness (CSNB) is a group of inherited retinal disorders.
  • Specific genetic mutations can lead to visual impairment and abnormal eye movements in infants.

Purpose of the Study:

  • To investigate the link between genetic mutations and the development of motility disorders in infant boys with CSNB.
  • To characterize the specific clinical features and genetic underpinnings of these visual and ocular motor abnormalities.

Main Methods:

  • Clinical examination of eleven infant boys with specific gaze abnormalities.
  • Genetic analysis to identify mutations in genes associated with CSNB, including CACNA1F and NYX.
  • Electrophysiological testing (ERG) and visual acuity assessment.

Main Results:

  • Eleven infant boys presented with chin-up head posture, tonic downgaze, and abnormal saccadic eye movements.
  • Eight boys had CACNA1F mutations (incomplete CSNB), and one had an NYX mutation (complete CSNB).
  • Reduced ERG amplitudes, severe myopia, and persistent horizontal pendular nystagmus were observed.

Conclusions:

  • The study identifies specific genetic mutations (CACNA1F, NYX) underlying a motility disorder in infant boys with CSNB.
  • A defective synapse between rod and ON-bipolar cells is implicated in causing both the visual impairment and the motility disorder.
  • These findings highlight the connection between genetic defects in retinal synaptic function and complex ocular motor abnormalities.

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