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Type: Artigo
Title: Clinical significance of an alloantibody against the kell blood group glycoprotein
Author: Maris Mattaloni, Stella
Arnoni, Carine
Cespedes, Rosario
Nonaka, Claudia
Trucco Boggione, Carolina
Lujan Brajovich, Melina Eliana
Trejo, Andrea
Zani, Nestor
Silvia Biondi, Claudia
Castilho, Lilian
Miguel Cotorruelo, Carlos
Abstract: Background: Kell null (K-0) individuals can produce anti-Ku, an antibody against many epitopes in the Kell glycoprotein, after transfusion and/or pregnancy. Since sensitized K-0 patients are rare, little is known about anti-Ku clinical relevance and in particular about its association to hemolytic disease of the fetus and newborn. Case Report: This work describes a case of neonatal hyperbilirubinemia due to immune-mediated erythrocyte destruction by an alloantibody directed against the Kell glycoprotein. Serologic and molecular approaches identified an anti-Ku alloantibody in maternal serum. A homozygous IVS3 + 1g>a point mutation (KEL*02N.06 allele) was found to be responsible for the lack of Kell antigen expression in the mother's red blood cell and subsequent alloimmunization after a previous pregnancy. Even though in most cases Kell antibodies are clinically severe and may cause suppression of erythropoiesis, in our case the newborn had a moderate anemia and hyperbilirubinemia that was successfully treated with phototherapy without requiring exchange transfusion. Serological and molecular studies performed in the proband's family members allowed us to provide them with proper counseling regarding alloimmunization after transfusion and/or pregnancy. Conclusions: This case enlarges the understanding of the clinical significance of alloantibodies against Kell blood group antigens
Subject: Grupos sanguíneos
Country: Suíça
Editor: Karger
Rights: Fechado
Identifier DOI: 10.1159/000448381
Date Issue: 2017
Appears in Collections:HEMO - Artigos e Outros Documentos

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