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Infection01:20

Infection

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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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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
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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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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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基础科学和病原发生学

Bilcag Akgun1, Mario Cornejo-Olivas2,3, Pedro R Mena1

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秘鲁的全基因组关联研究 (GWAS) 确定了一种新的阿尔茨海默病 (AD) 风险变体,p.H157Y,特定于美洲印第安人的祖先. 这一发现强调了多样化的人口在理解AD遗传学的重要性.

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科学领域:

  • 遗传学 是一个遗传学.
  • 神经科学是一个神经科学.
  • 人口研究 人口研究

背景情况:

  • 阿尔茨海默病 (AD) 研究中的遗传多样性对于识别风险和保护性等位基因至关重要.
  • 秘鲁人口具有重要的美洲印第安人血统,为AD遗传研究提供了独特的资源.
  • 之前的研究已经描述了已知的AD遗传风险位置.

研究的目的:

  • 在秘鲁人口中进行全基因组关联研究 (GWAS).
  • 在这个多样化的队列中描述已知的阿尔茨海默病 (AD) 遗传风险位点.
  • 为了确定与AD相关的祖先特异性遗传变异.

主要方法:

  • 全基因组关联研究 (GWAS) 基于来自567个个体的全基因组测序 (WGS) 数据 (215个AD,352个对照).
  • 利用了针对共变量和遗传亲属关系进行调整的通用线性混合模型.
  • 对显著变异进行了链接不平衡 (LD) 分析和本地祖先 (LA) 评估.

主要成果:

  • 复制已知的AD位点:APOE4等位基因和TREML2标志物 (rs60755019).
  • 确定了一个TREM2误解变体 (p.H157Y) 在强烈的LD与TREML2中,位于美洲印第安人的祖先背景.
  • 与非西班牙裔白人人口相比,在秘鲁人中观察到APOE的效果大小更高;p.H157Y在全球范围内很少见,但在混合美国人中存在.

结论:

  • 在秘鲁发现了一种新的阿尔茨海默氏病 (AD) 易感变体,p.H157Y,与美洲印第安人的祖先有关.
  • 此前在汉语中发现的TREM2变体p.H157Y可能具有祖先特异性影响.
  • 研究结果强调了研究多样化的群体的价值,以充分阐明AD的遗传结构及其病原性.