Association of apolipoprotein E polymorphism in late-onset Alzheimer's disease and vascular dementia in Brazilians
Braz. j. med. biol. res
;
36(7): 919-923, July 2003. tab
Article
in English
| LILACS
| ID: lil-340681
RESUMO
The genetic basis for dementias is complex. A common polymorphism in the apolipoprotein E (APOE) gene is considered to be the major risk factor in families with sporadic and late-onset Alzheimer's disease as well as in the general population. The distribution of alleles and genotypes of the APOE gene in late-onset Alzheimer's disease (N = 68), other late-life dementias (N = 39), and in cognitively normal controls (N = 58) was determined, as also was the risk for Alzheimer's disease associated with the epsilon4 allele. Peripheral blood samples were obtained from a total of 165 individuals living in Brazil aged 65-82 years. Genomic DNA was amplified by the polymerase chain reaction and the products were digested with HhaI restriction enzyme. APOE epsilon2 frequency was considerably lower in the Alzheimer's disease group (1 percent), and the epsilon3 allele and epsilon3/epsilon3 genotype frequencies were higher in the controls (84 and 72 percent, respectively) as were the epsilon4 allele and epsilon3/epsilon4 genotype frequencies in Alzheimer's disease (25 and 41 percent, respectively). The higher frequency of the epsilon4 allele in Alzheimer's disease confirmed its role as a risk factor, while epsilon2 provided a weak protection against development of the disease. However, in view of the unexpectedly low frequency of the epsilon4 allele, additional analyses in a more varied Brazilian sample are needed to clarify the real contribution of apolipoprotein E to the development of Alzheimer's disease in this population
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Apolipoproteins E
/
Polymorphism, Genetic
/
Dementia, Vascular
Type of study:
Etiology study
/
Observational study
/
Risk factors
Limits:
Aged
/
Aged80
/
Female
/
Humans
/
Male
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Braz. j. med. biol. res
Journal subject:
Biology
/
Medicine
Year:
2003
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Faculdade de Medicina de Säo José do Rio Preto/BR
/
Universidade Estadual Paulista Júlio de Mesquita Filho/BR
/
Universidade de Säo Paulo/BR
Similar
MEDLINE
...
LILACS
LIS