Slow and fast rod ERG pathways in patients with X-linked complete stationary night blindness carrying mutations in the NYX gene.
OBJECTIVE
To study the slow and fast rod signals of the scotopic 15-Hz flicker ERG in patients carrying mutations in the NYX gene, which has been recently identified as the cause of the complete form of congenital stationary night blindness, CSNB1.


METHODS
Twenty eyes of 11 patients with CSNB1 who had nondetectable standard ERG rod b-waves were involved in the study. Scotopic ERG response amplitudes and phases to flicker intensities ranging from -3.37 to -0.57 log scotopic trolands. sec (scot td. sec) were measured at a flicker frequency of 15 Hz. ERG signals to flicker intensities between -3.37 and -1.97 and between -1.17 and -0.57 log scot td. sec were considered to represent primarily the slow and fast rod ERG pathway, respectively. Additionally, standard ERGs were performed. Twenty-two normal volunteers served as control subjects.


RESULTS
For the slow rod ERG pathway, all patients exhibited ERG signals that were indistinguishable from noise. Accordingly, there was no systematic phase behavior for the slow rod signals. For the fast rod ERG pathway, the signals were significantly above noise, but they were significantly reduced in amplitude and advanced in phase.


CONCLUSIONS
There is evidence that the slow and the fast rod ERG signals can be attributed to the rod bipolar-AII cell pathway and the rod-cone-coupling pathway, respectively. The current study provides evidence to suggest that a defective NYX gene product (nyctalopin) prevents detectable signal transmission through ON rod bipolar cells, but there is a residual transmission through rod-cone gap junctions in CSNB1, possibly through the OFF cone pathway.
Scholl
H P
HP
Department of Pathophysiology of Vision and Neuroophthalmology, University Eye Hospital Tübingen, Germany. hendrik.scholl@uni-tuebingen.de
Langrová
H
H
Pusch
C M
CM
Wissinger
B
B
Zrenner
E
E
Apfelstedt-Sylla
E
E
D000293:Adolescent; D000328:Adult; D002648:Child; D004252:DNA Mutational Analysis; D004596:Electroretinography; D005425:Flicker Fusion; D008040:Genetic Linkage; D006801:Humans; D008875:Middle Aged; D009154:Mutation; D009755:Night Blindness / Q000235:genetics / Q000503:physiopathology*; D011509:Proteoglycans / Q000235:genetics*; D017948:Retinal Rod Photoreceptor Cells / Q000502:physiology*; D014795:Visual Pathways / Q000503:physiopathology*; D014960:X Chromosome
C416505:NYX protein, human; D011509:Proteoglycans