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The mutation G298A®Ala100Thr on the
coding sequence of the Duffy antigen/
chemokine receptor gene in non-caucasian
Angela Cristina Estalote1, Rodrigo Proto-Siqueira2,4, Wilson Araújo Da Silva Jr.3,4,
Marco Antonio Zago2,4 and Marcos Palatnik1
1Departamento de Clínica Médica, Hospital Universitário Clementino Fraga Filho,
Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
2Departamento de Clínica Médica, 3Departamento de Genética, Faculdade de Medicina,
Universidade de São Paulo, Ribeirão Preto, SP, Brasil
4Centro de Terapia Celular, Ribeirão Preto, SP, Brasil
Corresponding author: M. Palatnik
Genet. Mol. Res. 4 (2): 166-173 (2005)
Received August 10, 2004
Accepted February 14, 2005
Published April 29, 2005

ABSTRACT. Ala100Thr has been suggested to be a Caucasian genetic marker on the FY*B allele. As the Brazilian population has arisen from miscegenation among Portuguese, Africans, and Indians, this mutation could possibly be found in Euro- and Afro-Brazilians, or in Brazilian Indians. Fifty-three related individuals and a random sample of 100 subjects from the Brazilian population were investigated using the polymerase chain reaction and four restriction fragment length polymorphisms. Confirming the working hypothesis, among the related individuals three Afro-Brazilians (two of them a mother and daughter) and a woman of Amerindian descent had the Ala100Thr mutation on the FY*B allele. Five non-related Euro-Brazilians also carried the mutation. All nine individuals presented the Fy(a-b+) phenotype. We conclude that the Ala100Thr mutation can occur in populations other than Caucasians and that this mutation does not affect Duffy expression on red blood cells. Gene frequencies for this allele in the non-related individuals were in agreement with those of other populations. The Duffy frequencies of two Amerindian tribes were also investigated.

Key words: Duffy blood group, DARC, DNA polymorphism, Genetic polymorphisms, Amerindians, Brazilian population


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