title: Consanguineous marriage resulting in homozygous occurrence of X-linked retinoschisis in girls.
abstract: OBJECTIVE
  To investigate a family afflicted with X-linked retinoschisis and to determine the pedigree leading to such an occurrence.
  
  
  METHODS
  Observational case series.
  
  
  METHODS
  Visual acuities were measured at The Aga Khan University Hospital Ophthalmology clinic. Slit-lamp examination, direct and indirect ophthalmoscopies were performed on each of the seven members of this family. The pedigree was established by appropriate questioning about the rest of their family.
  
  
  RESULTS
  The pedigree revealed the homozygosity of the four daughters for the XLRS mutations borne out of the consanguineous marriage between an affected father and a carrier mother.
  
  
  CONCLUSIONS
  This is the first report showing that consanguineous marriages lead to homozygous pairing of XLRS genes in female children, as concluded after a MEDLINE search.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D003241:Consanguinity; D015785:Eye Diseases, Hereditary / Q000235:genetics*; D005136:Eye Proteins / Q000235:genetics; D005260:Female; D040181:Genetic Diseases, X-Linked / Q000235:genetics*; D006720:Homozygote; D006801:Humans; D007223:Infant; D008297:Male; D008393:Marriage; D010375:Pedigree; D041441:Retinoschisis / Q000235:genetics*; D014792:Visual Acuity
chemical_list: D005136:Eye Proteins; C108726:RS1 protein, human