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[Congenital stationary night blindness (CSNB)--a case report]
D Liláková1, J Svĕrák, D Hejcmanová
1Ocni klinika FN, Hradec Králové. lilakovad@lfhk.cuni.cz
Summary
Congenital stationary night blindness (CSNB) type Schubert-Bornschein follows X-linked inheritance, affecting males while females transmit the trait. Diagnosis is crucial as this inherited condition is untreatable.
Area of Science:
- Ophthalmology
- Medical Genetics
Background:
- Congenital stationary night blindness (CSNB) encompasses a group of inherited retinal disorders.
- The Schubert-Bornschein type of CSNB is characterized by specific electroretinogram (ERG) findings.
Observation:
- A family exhibiting CSNB type Schubert-Bornschein was studied to determine inheritance patterns.
- Affected individuals were predominantly male, with females acting as carriers, consistent with X-linked inheritance.
- High myopia was observed in both affected males and carrier females within the family.
Findings:
- The study confirmed X-linked inheritance for CSNB type Schubert-Bornschein in the studied family.
- Electroretinogram (ERG) was essential for diagnosing CSNB and differentiating subtypes.
- The co-occurrence of high myopia alongside CSNB in this family was noted.
Implications:
- Accurate diagnosis of CSNB is vital for patient management, despite the lack of current treatments.
- ERG testing is a mandatory diagnostic tool for CSNB.
- Understanding the genetic basis and phenotypic expression, including associated conditions like high myopia, aids in genetic counseling and family planning.