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相关概念视频

Incomplete Dominance01:43

Incomplete Dominance

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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
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Disorders of Hemostasis01:24

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Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
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X-linked Traits01:19

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In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
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相关实验视频

Updated: May 22, 2025

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
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两个新的同胞患有完全的D因子缺乏症.

Mathilde Puel1, Kenza Rwayane1, Paula Vieira Martins1

  • 1Department of Immunology, Assistance Publique- Hôpitaux de Paris (AP-HP), Georges Pompidou European Hospital, Paris, France.

European journal of immunology
|March 12, 2025
PubMed
概括

确定了两个完全缺乏D因子 (FD) 的新病例,其中一个是唐氏综合征患者. 这凸显了研究补充系统缺陷的必要性,特别是在复发性感染患者中研究替代途径 (AP).

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科学领域:

  • 免疫学 免疫学 免疫学
  • 遗传学 是一个遗传学.

背景情况:

  • 补充系统的替代途径 (AP) 的先天性缺陷与严重的感染有关,主要来自封装细菌.
  • 完全缺乏D因子 (FD) 是罕见的,以前只报告了七个家庭.

研究的目的:

  • 报告两例新的生化和遗传确认的完全FD缺乏病例.
  • 强调对患有唐氏综合征和其他二次免疫缺陷的患者补充系统的研究的重要性.

主要方法:

  • 生物化学测试来测量FD活动和水平 (ELISA).
  • 对CFD基因进行基因分析,以确定致病变异.
  • 临床病例报告和文献审查.

主要成果:

  • 确定了两名完全患有FD缺乏症的患者,他们患有H型流感和N型脑膜炎的严重感染.
  • 复合人体FD无法检测到FD活动,并通过复合人体FD恢复;ELISA证实无法检测到FD水平.
  • 遗传分析显示,在一个患者中存在同卵性错觉变体 (p.M40R),在另一个患者中存在复合异卵性变体 (p.Cys148*和c.212+2T>G).

结论:

  • 这项研究报告了唐氏综合征患者FD完全缺陷的第一个病例,强调了对这一群体进行补充系统评估的必要性.
  • 遗传完整的FD缺陷需要针对封装细菌的预防策略,特别是对于治疗MASP-3或FD抑制剂的人来说.