Clinical reinvestigation and linkage analysis in the family with Episkopi blindness (Norrie disease).
We present the results of a clinical and genetic reinvestigation of the Cypriot family affected by an X chromosomally inherited eye disease originally published by Taylor et al, who coined the term Episkopi blindness. The pedigree was extended to 160 members, including 16 affected males out of 48 males at risk for the disease, most of whom were seen by one of us (PA). Affected males are blind with no associated symptoms and apparently are not mentally retarded. Thirty-nine family members agreed to blood sampling for genetic investigations. RFLP analysis was performed using probes from the region known to be deleted in some Norrie patients and polymorphic markers (DXS77, DXS7, MAOA, DXS255) from the proximal short arm of the X chromosome. There was no deletion for any of the probes in the affected males. Linkage analysis yielded positive lod scores for all informative markers (Z (DXS255, theta = 0) = 6.54, Z (MAOA, theta = 0) = 2.23, Z (DXS7, theta = 0) = 2.13). Thus, the conclusion that Episkopi blindness and Norrie disease (NDP, MIM *310600) are the same entity based on clinical evidence is now reinforced by gene mapping.
Wolff
G
G
Institut für Humangenetik, Freiburg, Germany.
Mayerová
A
A
Wienker
T F
TF
Atalianis
P
P
Ioannou
P
P
Warburg
M
M
D000328:Adult; D000368:Aged; D001766:Blindness / Q000000981:diagnostic imaging / Q000235:genetics*; D002874:Chromosome Mapping; D005260:Female; D005808:Genes, Recessive; D008040:Genetic Linkage; D005819:Genetic Markers; D006801:Humans; D008126:Lod Score; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D009626:Terminology as Topic; D014057:Tomography, X-Ray Computed; D014960:X Chromosome
D005819:Genetic Markers