Polimorfismos del gen de resistencia a múltiples drogas (MDR1) en poblaciones chilenas: mapuche, mestiza y maorí / Polymorphisms of the multiple drug resistance gene (MDR1) in Mapuche, Mestizo and Maori populations in Chile
Rev. méd. Chile
; 132(9): 1061-1068, sept. 2004. tab, ilus
Article
em Es
| LILACS
| ID: lil-443220
Biblioteca responsável:
BR1.1
ABSTRACT
BACKGROUND:
There are significant differences in drug responses among different ethnic groups. The multidrug transporter P-gp, encoded by the MDR1 gene, plays a key role in determining drug bioavailability, and an association between a polymorphism in exon 26 (C3435T) and lower P-gp expression has been found. The co-segregation of this polymorphism with the polymorphism in exon 12 (C1236T) and in exon 21 (G2677T/A) determines several MDR1 haplotypes in humans.AIM:
To characterize the polymorphisms of exons 26, 21 and 12 of the MDR1 gene in different Chilean populations. MATERIAL ANDMETHODS:
Using a polymerase chain reaction and restriction fragment length polymorphism technique, we studied the allelic frequencies and the distribution of MDR1 haplotypes in 3 Chilean populations Mestizo (n=104), Mapuche (n=96, living in the National Reservation of the Huapi Island, Ranico Lake) and Maori (n=52, living in Eastern Island).RESULTS:
The frequency of the normal MDR1*1 haplotype, without mutations, was lower in Mapuches than in Mestizos or Maoris (p<0.005) but similar to that reported in Asian population (p=0.739), probably due to the Asian origin of the Amerindian populations. In addition, the MDR1*l haplotype fequency hin Mestizos was similar to the frequency reported in Caucasians (p=0.49), in agreement with the origin of our population, with a strong influence of Caucasian genes from the Spanish conquerors. The MDR1*2 haplotype distribution, with the three polymoyphisms and probably lower multidrug transporter expression, was similar in the three Chilean populations studied (p>0.0.5), but lower than the frequencies reported in Caucasians or Asians (p<0.05).CONCLUSIONS:
We found significant differences in the frequencies of genetic polymorphisms of the MDR1 gene in Chilean populations, related to the ethnic origins of our ancestors.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Polimorfismo Genético
/
Haplótipos
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Indígenas Sul-Americanos
/
Éxons
/
Genes MDR
/
Oceânicos
Limite:
Humans
País/Região como assunto:
America do sul
/
Chile
Idioma:
Es
Revista:
Rev. méd. Chile
Assunto da revista:
MEDICINA
Ano de publicação:
2004
Tipo de documento:
Article
País de afiliação:
Chile
País de publicação:
Chile