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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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基础科学和病原发生学

César A Valdez-Gaxiola1,2, Frida Rosales Leycegui1,2, Martha Patricia Gallegos Arreola2

  • 1Universidad de Guadalajara, Guadalajara, JA, Mexico.

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概括

APOEε4和APOEε2基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因 APOEε4延迟了症状的出现,而APOEε2则加速了症状的出现,这表明了双重的遗传作用.

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科学领域:

  • 神经遗传学 神经遗传学
  • 阿尔茨海默氏症疾病研究研究
  • 人类遗传学 人类遗传学

背景情况:

  • 早期发病的阿尔茨海默病 (EOAD) 是一种罕见的神经退行性疾病,通常与特定的基因突变有关,如PSEN1 A431E.
  • PSEN1 A431E突变导致疾病迅速进展,患者通常在42.5岁左右表现出症状,并在7.5年内死亡.
  • 即使在具有相同突变的家族中,临床变异性也存在,这促使对其他遗传修饰物的研究.

研究的目的:

  • 研究Apolipoprotein E (APOE) 基因对PSEN1 A431E突变患者家族早期阿尔茨海默病 (EOAD) 临床表型的影响.
  • 为了确定APOEε2和APOEε4等位基因是否影响该EOAD队列的症状发病年龄或最初的临床表现.

主要方法:

  • 评估了89名具有家族EOAD,表现出自体主导遗传模式的患者.
  • 通过桑格测序证实了PSEN1 A431E突变.
  • 使用实时PCR和分析临床相关性与描述性统计和回归模型的基因型APOEε2和APOEε4等位基因.

主要成果:

  • 在PSEN1 A431E突变载体中,APOE等位基因与症状发病时的年龄之间发现了显著的关联.
  • 携带APOEε4的患者在症状发作中经历了4.15年 (p=0.00035) 的统计学显著延迟.
  • 携带APOEε2的患者表现出症状发作的显著加速2.34年 (p=0.037),没有观察到对初始临床表现的影响.

结论:

  • APOEε4和APOEε2等位基因对患有PSEN1 A431E突变的EOAD患者的症状发作具有逆效应,与它们在晚期发作的AD中已知的作用形成鲜明对比.
  • 在这种特定的EOAD遗传背景下,APOEε4延迟了,而APOEε2加速了症状发病的年龄.
  • 这些发现强调了APOE等位基因在EOAD中作为基因修饰物的双重作用,可能使个性化风险评估和有针对性的治疗策略成为可能.