A novel mutation in RDH5 gene causes retinitis pigmentosa in consanguineous Pakistani family

Neelam Sultan, Irfan Ali, Shazia Anwer Bukhari, Shahid Mahmood Baig, Muhammad Asif, Muhammad Qasim, Muhammad Imran Naseer, Mahmood Rasool

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Retinitis pigmentosa (RP) is the most frequent genetically and clinically heterogeneous inherited retinal degeneration. To date, more than 80 genes have been identified that cause autosomal dominant, autosomal recessive and X linked RP. However, locus and allelic heterogeneity of RP has not been fully captured yet. This heterogeneity and lack of an accurate genotype phenotype correlation makes molecular dissection of the disease more difficult. The present study was designed to characterize the underlying pathogenic variants of RP in Pakistan. For this purpose, a large consanguineous family with RP phenotype showing autosomal recessive mode of inheritance was selected after a complete ophthalmological examination. Next generation sequencing was used for the identification of molecular determinant followed by Sanger-sequencing for confirmation. After sequence analysis a novel homozygous missense mutation, (c.602 C > T) in exon 4 of the RDH5 gene (MIM: 601617) was identified. This mutation resulted in substitution of phenyl alanine for serine at amino acid 201 (p.Ser201Phe) of the RDH5 gene. The same mutation was not detected in the 200 ethnically-matched control samples by Sanger sequencing. The identified mutant allele segregated in homozygous fashion in all the affected individuals of pedigree. Identification of this mutation reveals the allelic heterogeneity of RDH5 in patients with RP phenotype. The findings of this study demonstrate the clinical significance of next generation sequencing to understand the molecular basis of diseases and would help to reveal new proteins and their function in visual cycle will pave the way for early diagnosis, genetic counseling and better therapeutic inventions.

Original languageEnglish
Pages (from-to)553-559
Number of pages7
JournalGenes and Genomics
Volume40
Issue number5
DOIs
Publication statusPublished - 1 May 2018
Externally publishedYes

Keywords

  • Missense mutation
  • Next generation sequencing
  • Pakistan
  • RDH5
  • Retinitis pigmentosa

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