HPA Frequencies in the Syrian Population

Area of Science:

• Immunogenetics
• Transfusion Medicine
• Population Genetics

Background:

• Exposure to allogenic Human Platelet Antigens (HPAs) can cause antibody formation and immunological reactions.
• HPA antigen frequencies vary across ethnic groups, impacting alloimmunization risk assessment.
• No prior studies on HPA antigen frequencies in the Syrian population existed.

Purpose of the Study:

• To determine the gene frequencies of common Human Platelet Antigens (HPAs) in the Syrian population.
• To compare Syrian HPA frequencies with those of the German population and other ethnic groups.
• To assess the need for specific precautions in transfusion medicine and pregnancy involving individuals of Syrian origin.

Main Methods:

• DNA was isolated from blood samples of 96 Syrian volunteers.
• Genotyping for HPA-1, -2, -3, -4, -5, -6, -9, and -15 was performed using sequence-specific primer polymerase chain reaction (SSP-PCR).
• Results were compared with existing data from the German population and other international studies.

Main Results:

• Gene frequencies for HPA-1a/1b, -2a/2b, -3a/3b, -4a/4b, -5a/5b, -6a/6b, -9a/9b, and -15a/15b were determined in the Syrian cohort.
• Specific frequencies reported: HPA-1 (0.837/0.163), HPA-2 (0.875/0.125), HPA-3 (0.630/0.370), HPA-4 (1.000/0.000), HPA-5 (0.837/0.130), HPA-6 (1.000/0.000), HPA-9 (1.000/0.000), HPA-15 (0.457/0.543).
• No statistically significant differences were observed between HPA antigen frequencies in the Syrian and German populations.

Conclusions:

• HPA antigen frequencies in the Syrian population are comparable to those in the German population.
• No specific precautions are deemed necessary for blood product selection in Syrian patients.
• No special considerations are required for pregnant interethnic couples involving Syrian individuals concerning HPA alloimmunization.