The pattern of thalassemia in Naples

Area of Science:

• Medical Genetics
• Hematology

Background:

• Cooley anemia, a severe form of beta-thalassemia, presents significant genetic complexity.
• The Naples region exhibits a notable incidence of beta-thalassemic and Lepore genes.

Purpose of the Study:

• To estimate the prevalence of Cooley anemia in Naples.
• To analyze the genetic factors contributing to thalassemia syndromes in the region.
• To investigate the influence of alpha-thalassemia on clinical variability.

Main Methods:

• Analysis of heterozygote frequencies to predict Cooley anemia cases.
• Genotyping to identify beta-thalassemic and Lepore gene combinations.
• Assessment of alpha-thalassemia co-occurrence and its impact on globin gene expression.

Main Results:

• Predicted Cooley anemia cases in Naples exceed hospital statistics.
• At least six genotypes, including homozygotes and compound heterozygotes for beta-thalassemia and Lepore genes, cause significant thalassemia syndromes.
• Alpha-thalassemia co-inheritance contributes to the variability of globin gene expression.
• Hb Lepore homozygotes showed differences in non-alpha/alpha ratios, potentially linked to gamma/alpha mRNA ratios and clinical presentation.

Conclusions:

• Underestimation of Cooley anemia in Naples highlights the need for improved genetic screening.
• The genetic landscape of Naples supports a wide spectrum of thalassemia syndromes.
• Alpha-thalassemia plays a role in modulating clinical phenotypes of beta-thalassemia.