The genetics of rod-cone dystrophy in Arab countries: a systematic review

Eur J Hum Genet. 2021 Jun;29(6):897-910. doi: 10.1038/s41431-020-00754-0. Epub 2020 Nov 13.

Abstract

Since a substantial difference in the prevalence of genetic causes of rod-cone dystrophy (RCD) was found among different populations, we conducted a systematic review of the genetic findings associated with RCD in Arab countries. Of the 816 articles retrieved from PubMed, 31 studies conducted on 407 participants from 11 countries were reviewed. Next-generation sequencing (NGS) was the most commonly used technique (68%). Autosomal recessive pattern was the most common pattern of inheritance (97%) and half of the known genes associated with RCD (32/63) were identified. In the Kingdom of Saudi Arabia, in addition to RP1 (20%) and TULP1 (20%), gene defects in EYS (8%) and CRB1 (7%) were also prevalently mutated. In North Africa, the main gene defects were in MERTK (18%) and RLBP1 (18%). Considering all countries, RP1 and TULP1 remained the most prevalently mutated. Variants in TULP1, RP1, EYS, MERTK, and RLBP1 were the most prevalent, possibly because of founder effects. On the other hand, only ten Individuals were found to have dominant or X-linked RCD. This is the first time a catalog of RCD genetic variations has been established in subjects from the Arabi countries. Although the last decade has seen significant interest, expertise, and an increase in RCD scientific publication, much work needs to be conducted.

Publication types

  • Systematic Review

MeSH terms

  • Carrier Proteins / genetics
  • Cone-Rod Dystrophies / genetics*
  • Eye Proteins / genetics
  • Female
  • Gene Frequency
  • Genetic Heterogeneity
  • Genetic Testing / statistics & numerical data*
  • Humans
  • Male
  • Microtubule-Associated Proteins / genetics
  • Middle East
  • Mutation*
  • c-Mer Tyrosine Kinase / genetics

Substances

  • 11-cis-retinal-binding protein
  • Carrier Proteins
  • Eye Proteins
  • Microtubule-Associated Proteins
  • RP1 protein, human
  • TULP1 protein, human
  • MERTK protein, human
  • c-Mer Tyrosine Kinase