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“Molecular analysis of the rare S–s– red blood cell phenotype in blood donors and patients in south‐east Brazil”

The rare S–s– phenotype has two main molecular backgrounds. GYPB deletions give rise to the S–s–U– phenotype, which loses the expression of the U antigen, while variant GYPB alleles usually lead to the S–s–U+var phenotype, which express a variant U antigen. The S–s– phenotype is typically found in people of African origin and represents a challenge in transfusion sets, especially when S–s– patients develop anti‐U. Molecular analysis is the most reliable method for determining U antigen status. We studied the molecular basis of the S–s– phenotype in donors and patients at Regional Blood Center of Ribeirão Preto.