apolipoproteína e e a doença de alzheimer
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ID: 128303
2004
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Abstract
Sabemos hoje que os polimorfismos no gene da apolipoproteína E (apoE) são importantes fatores de risco para o desenvolvimento da doença de Alzheimer (DA). O gene apoE humano, mapeado no braço longo do cromossomo 19 (19q13.2), codifica uma glicoproteína com 317 aminoácidos, a qual desempenha um papel fundamental para o catabolismo de componentes ricos em triglicérides no corpo humano. Em humanos, existem três alelos principais do gene apoE, decorrentes de apenas duas alterações no DNA, chamados de épsilon2, épsilon3 e épsilon4. A identificação da variante épsilon4 do gene apoE como o fator genético de risco mais comum para a DA de início tardio sugere que o colesterol deva ter um papel direto na patogênese da doença. Contudo, a simples presença do alelo apoE épsilon4 não é necessária nem suficiente para causar DA; este alelo apenas aumenta o risco de o indivíduo vir a desenvolver a doença, indicando que existem outros fatores ambientais e genéticos importantes no desenvolvimento da mesma.
It is known that polymorphisms in the gene of the apolipoprotein E (apoE) are important risk factors in the development of the Alzheimer's disease (AD). The human gene apoE, which is mapped in the long arm of chromosome 19 (19q13.2), codes for a glycoprotein with 317 amino acids, which plays a basic role for the catabolism of triglyceride-rich components in the human body. In our species the apoE gene appears in the form of three main alleles, produced from two alterations in the DNA sequence, called epsilon2, epsilon3 and epsilon4. The identification of the variant epsilon4 of gene apoE as the most relevant genetic marker for the risk for late-onset AD suggests that cholesterol may have a direct involvement in the pathogenesis of this disease. However, apoE epsilon4 is not necessary nor enough to cause Alzheimer's disease. It only increases the risk of an individual to develop the illness, indicating that other environmental/genetic factors shoud play important roles in the development of the disease.
It is known that polymorphisms in the gene of the apolipoprotein E (apoE) are important risk factors in the development of the Alzheimer's disease (AD). The human gene apoE, which is mapped in the long arm of chromosome 19 (19q13.2), codes for a glycoprotein with 317 amino acids, which plays a basic role for the catabolism of triglyceride-rich components in the human body. In our species the apoE gene appears in the form of three main alleles, produced from two alterations in the DNA sequence, called epsilon2, epsilon3 and epsilon4. The identification of the variant epsilon4 of gene apoE as the most relevant genetic marker for the risk for late-onset AD suggests that cholesterol may have a direct involvement in the pathogenesis of this disease. However, apoE epsilon4 is not necessary nor enough to cause Alzheimer's disease. It only increases the risk of an individual to develop the illness, indicating that other environmental/genetic factors shoud play important roles in the development of the disease.
| Reference Key |
ojopi2004archivesapolipoprotena
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| Authors | ;Elida P. Benquique Ojopi;Alexandre Bruno Bertoncini;Emmanuel Dias Neto |
| Journal | arthritis research & therapy |
| Year | 2004 |
| DOI |
10.1590/S0101-60832004000100005
|
| URL | |
| Keywords | Keywords not found |
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