Sickle cell disease: no longer a single gene disorder

Area of Science:

• Genetics
• Hematology
• Molecular Biology

Background:

• Sickle cell disease (SCD) exhibits a wide spectrum of clinical severity in affected individuals.
• Genetic factors influencing disease severity are increasingly recognized.

Purpose of the Study:

• To explore the genetic basis of variable sickle cell disease phenotypes.
• To highlight the potential for discovering novel therapeutic targets through genetic research.

Main Methods:

• Review of identified genetic loci modulating the sickle cell disease phenotype.
• Analysis of genetic variations within and outside the beta-globin gene cluster.

Main Results:

• Multiple genetic loci, including intronic motifs and genes on various chromosomes, have been linked to SCD phenotype modulation.
• The human genome project is expected to accelerate the discovery of additional genetic modifiers.

Conclusions:

• The multigenic nature of sickle cell disease provides a model for understanding phenotypic variation in single-gene disorders.
• Further genetic discoveries promise to enhance therapeutic strategies for sickle cell disease.