The beta thalassaemia trait in Jamaica

Area of Science:

• Genetics
• Hematology
• Public Health

Background:

• Beta thalassaemia is a genetic blood disorder affecting hemoglobin production.
• Understanding its prevalence and genetic variants is crucial for public health initiatives in Jamaica.

Purpose of the Study:

• To determine the prevalence and characteristics of the beta thalassaemia trait in Jamaican populations.
• To analyze the specific genetic variants and their distribution across different regions and age groups.

Main Methods:

• Screening of 221,306 newborns over 46 years for beta thalassaemia gene prevalence.
• Hematological assessment of 16,612 senior school students in Manchester parish.
• Analysis of specific beta thalassaemia variants, including mild beta+ and severe beta0 types.

Main Results:

• The beta thalassaemia trait prevalence was approximately 0.8-0.9% across Kingston, southwest Jamaica, and Manchester.
• Mild beta+ thalassaemia variants constituted a high percentage (75-89%) of cases.
• Beta0 thalassaemia variants were less common, with IVSII-849 A>G being the most frequent (58% of beta0 cases).

Conclusions:

• Mild beta+ thalassaemia genes are common in Jamaica and generally benign.
• The benign nature may lead to underdiagnosis of sickle cell-beta+ thalassaemia.
• Further research is needed to address clinical implications, such as pneumococcal prophylaxis.