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(Investigative Ophthalmology and Visual Science. 2003;44:1275-1281.)
© 2003 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.02-0895
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Diagnosis of Autosomal Dominant Retinitis Pigmentosa by Linkage-Based Exclusion Screening with Multiple Locus-Specific Microsatellite Markers

Hiroyuki Kondo,1 Tomoko Tahira,2 Atsushi Mizota,3 Emiko Adachi-Usami,3 Kenji Oshima,1 and Kenshi Hayashi2

1From the Department of Ophthalmology, Fukuoka University School of Medicine, Fukuoka, Japan; the 2Division of Genome Analysis, Research Center for Genetic Information, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan; and the 3Department of Ophthalmology and Visual Science, Graduate School of Medicine, Chiba University, Chiba, Japan.

PURPOSE. To describe a hierarchical approach for efficient genetic diagnosis of autosomal dominant retinitis pigmentosa (adRP).

METHODS. Forty di-, tri-, or tetra-nucleotide repeats tightly linked to 10 genes known to be responsible for adRP were identified from the human genome sequence and used as markers in multiplex amplification and genotyping, followed by linkage analysis. Discordance of cosegregation of markers and the disease excluded the majority of the examined genes as candidates, and mutation screening for the remaining genes was performed.

RESULTS. With this strategy, examination of an adRP-affected family indicated that 3 of 10 candidate genes segregated concordantly with the disease. Further searches for mutations revealed a novel insertion and deletion in the last exon of a splicing factor gene, PRPF8.

CONCLUSIONS. This systematic approach facilitates the molecular diagnosis of adRP, which is known to have a highly heterogeneous genetic background.




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