A novel locus for X-linked retinitis pigmentosa

Zongzhong Tong, Zhenglin Yang, Jay J. Meyer, Allen W. McInnes, Lai Xue, Asif M. Azimi, Jenn Baird, Yu Zhao, Erik Pearson, Changguan Wang, Yali Chen, Kang Zhang

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Introduction: Retinitis pigmentosa (RP) is the most prevalent group of inherited retinopathies and demonstrates considerable clinical and genetic heterogeneity, with wide variations in disease severity, progression, and gene involvement. We studied a large family with RP to determine the pattern of inheritance and to identify the disease-causing gene/locus. Materials and Methods: Ophthalmic examination was performed on 35 family members to identify affected individuals and carriers and to characterise the disease phenotype. Genetic linkage analysis was performed using short tandem repeat (STR) polymorphic markers encompassing the known loci for X-linked RP (xlRP) including RP2, RP3, RP6, RP23, and RP24. Mutation screening was performed by direct sequencing of PCR-amplified genomic DNA of the RP2 and RPGR genes of the affected individuals. Results: A highly penetrant, X-linked form of RP was observed in this family. Age of onset was from 5 to 8 years and visual acuity ranged from 20/25 in children to light perception in older adults. Linkage analysis and direct sequencing showed that no known loci/genes were associated with the phenotype in this kindred. Conclusion: A novel disease gene locus/loci is responsible for the xlRP phenotype in this family.

Original languageEnglish (US)
Pages (from-to)476-478
Number of pages3
JournalAnnals of the Academy of Medicine Singapore
Issue number7
StatePublished - Jul 2006
Externally publishedYes


  • Genetic linkage
  • Mutation screening
  • Retinopathy

ASJC Scopus subject areas

  • Medicine(all)


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