New mutations of locus control region in Saudi sickle patients

Abstract

Sickle cell anemia (SCA) is a common hematological disease affecting humans. Detection of a single base pair mutation in β-globin gene is an important diagnostic tool for SCA. The aim was to study the molecular survey of locus control regions (LCR) in Saudi patients with sickle cell anemia, and to identify the genetic variables and their clinical manifestations.

Methodology

Blood samples from 69 unrelated sickle cell disease patients were obtained from the KKUH, Riyadh between 2017–2019. In this study, the DNA was extracted and PCR was performed. Additional PCR amplifications reactions covering the LCR were performed by using another different set of primers. Seven specific primer pairs were used to amplify seven regions in the locus control region (LCR) of β globin family. The generated fragments were sequenced to identify the possible alterations in this region.

Results

The results gained from sequencing experiments revealed a wide range of genomic alterations.

 A total of 69 gene alterations have been recognized in the locus control region;-

 The first fragment LCR-HS1 shows 20 alterations;

 The second fragment LCR-HS2 revealed six changes;

 The third fragment LCR-HS3 shows many changes;

 The fifth LCR-HS5 region revealed four changes;

 The sixth fragment LCR-HS6 revealed eight changes;

 The seventh LCR-HS7 fragment demonstrates ten changes.

Conclusion

It clear that this study has successfully identified LCR mutations for random Saudi patients with SCD. The above results should be taken further to set up management strategies to improve outcomes.