title: Frequency of ABO blood group system polymorphisms in Plasmodium falciparum malaria patients and blood donors from the Brazilian Amazon region.
abstract: We investigated the ABO genotypes and heterogeneity of the O alleles in Plasmodium falciparum-infected and non-infected individuals from the Brazilian Amazon region. Sample collection took place from May 2003 to August 2005, from P. falciparum malaria patients from four endemic regions of the Brazilian Amazon. The control group consisted of donors from four blood banks in the same areas. DNA was extracted using the Easy-DNA(TM) extraction kit. ABO genotyping was performed using PCR/RFLP. There was a high frequency of ABO*O01O01. ABO*AO01 was the second most frequent genotype, and the third most frequent genotype was ABO*BO01. There were low frequencies of the ABO*O01O02, ABO*AA, ABO*AB, ABO*BB, and ABO*O02O02 genotypes. We analyzed the alleles of the O phenotype; the O(1variant) allele was the most frequent, both in malaria and non-malaria groups; consequently, the homozygous genotype O(1)(v)O(1)(v) was the most frequently observed. There was no evidence of the homozygous O(2) allele. Significant differences were not detected in the frequency of individuals with the various alleles in the comparison of the malaria patients and the general population (blood donors).
authors.affiliation: Universidade Estadual Paulista Júlio de Mesquita Filho, São José do Rio Preto, SP, Brasil.
authors.forename: D B
authors.initials: DB
authors.lastname: Carvalho
authors.forename: L C
authors.initials: LC
authors.lastname: de Mattos
authors.forename: W C
authors.initials: WC
authors.lastname: Souza-Neiras
authors.forename: C R
authors.initials: CR
authors.lastname: Bonini-Domingos
authors.forename: A B
authors.initials: AB
authors.lastname: Cósimo
authors.forename: L M
authors.initials: LM
authors.lastname: Storti-Melo
authors.forename: G C
authors.initials: GC
authors.lastname: Cassiano
authors.forename: A A A
authors.initials: AA
authors.lastname: Couto
authors.forename: A J
authors.initials: AJ
authors.lastname: Cordeiro
authors.forename: A R B
authors.initials: AR
authors.lastname: Rossit
authors.forename: R L D
authors.initials: RL
authors.lastname: Machado
mesh_terms: D000017:ABO Blood-Group System / Q000235:genetics*; D000293:Adolescent; D000328:Adult; D000368:Aged; D001782:Blood Donors; D001938:Brazil; D005260:Female; D006801:Humans; D016778:Malaria, Falciparum / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000235:genetics*; D012150:Polymorphism, Restriction Fragment Length / Q000235:genetics; D055815:Young Adult
chemical_list: D000017:ABO Blood-Group System