The prevalence of sickling abnormality in Oman: A review of relevant publications

Nawal Al-Mashaikhi*, Abdulhakim Al-Rawas, Yasser Wali, Ashraf Soliman, Doaa Khater

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review


Sickle cell disease (SCD), caused by a mutation in the β-globin gene HBB, is widely distributed in malaria endemic regions. The prevalence of sickle cell trait and disease reaches up to 4.8-6% and 0.2% respectively, which is the highest among the Arab Gulf states. Omani population represents a variability of HbS genotype combinations with other Hb genotypes modify the clinical severity of the disease. The most prevalent sickling abnormality in Oman is Hb S/S (SCA) followed by Hb S/β-thalassemia. Omani children with SCD with high Hb F level had less severe disease. More than two-thirds of SCD cases were running a mild course of the disease due to the high prevalence of a-thalassemia trait. The severity index has been correlated with the early age of presentation, the absence of a-thalassemia trait and the lower level of HbF as well as to the existence of different β-globin gene haplotypes. S/ β0 presented with the same clinical severity of S/S while those with S/ β+ had some splenic function into adulthood and were more prone to splenic sequestration. The unique existence of HbS-Oman (a severe variant of sickle hemoglobinopathy) markedly increased the severity of the disease. Compound heterozygotes HbS-Oman resulted in very severe clinical manifestations with transfusion-dependency and hypersplenism early in life. This paper summarizes and reviews βs gene haplotypes in patients with sickle cell anemia (SCA) in Oman. (

Original languageEnglish
Article numbere2022289
Pages (from-to)e2022289
JournalActa Biomedica
Issue number4
Publication statusPublished - Aug 31 2022
Externally publishedYes


  • Hb SS
  • Hb Sβ-thalassemia
  • HbF
  • Oman
  • Sickle cell disease
  • genotype
  • phenotype
  • severity
  • Haplotypes
  • Humans
  • Anemia, Sickle Cell/epidemiology
  • alpha-Thalassemia/genetics
  • Oman/epidemiology
  • Adult
  • beta-Thalassemia/epidemiology
  • Child
  • beta-Globins/genetics

ASJC Scopus subject areas

  • General Medicine

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