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The Intermediate Value Theorem is a foundational result in calculus that guarantees the existence of solutions within certain intervals for continuous functions. Formally, the Intermediate Value Theorem states that if a function f is continuous on the closed interval [a, b], and if N is any value between f(a) and f(b), then there exists at least one c ∈ (a, b) such that f(c) = N. This theorem is instrumental in proving the existence of roots and in analyzing the behavior of continuous...
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行为变异前性痴呆症与C9orf72中间重复扩张:一个病例报告.

Sufen Huang1,2, Yuzhang Bei2, Qingxiang Zhang3

  • 1Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China.

Alzheimer disease and associated disorders
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概括

一个罕见的前性痴呆症 (FTD) 病例与9号染色体开放阅读框架72 (C9orf72) 基因重复扩张49个单位相关,为中等长度等位基因提供了证据.

关键词:
行为变体痴呆症 痴呆症案例报告案例报告前性痴呆症前性痴呆症这是一种中间产品.重复扩张的扩张.

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科学领域:

  • 遗传学 遗传学 是一个
  • 神经科学是一个神经科学.
  • 神经学 神经学

背景情况:

  • 在C9orf72基因中的六核酸重复扩张是前性痴呆症 (FTD) 和肌性侧面硬化症 (ALS) 的主要遗传原因.
  • 确切的重复数量定义了病原体扩张,特别是在中间范围 (30到>60次重复),仍在争论中.
  • 这种不确定性影响了患者和家庭的遗传诊断和咨询.

研究的目的:

  • 报告一种罕见的行为变异前性痴呆症 (bvFTD) 病例,该病例与中长度C9orf72重复扩张有关.
  • 为正在进行的关于C9orf72等位基因在中间重复范围内的致病性讨论提供临床证据.
  • 为了突出这种特定遗传特征的患者的临床表现和神经成像发现.

主要方法:

  • 一个被诊断患有bvFTD的患者的病例报告.
  • 基因分析以识别和量化C9orf72重复扩张.
  • 神经心理评估,以评估认知和行为缺陷.
  • 神经成像研究 (MRI/PET) 来评估大脑结构和功能.

主要成果:

  • 这位患者呈现出C9orf72重复扩张的49个单位,属于中间长度范围.
  • 临床表现包括渐进性神经精神病衰退,情绪,记忆障碍等.
  • 神经成像显示了双边时和海马缩以及在特定的大脑区域减少葡萄糖代谢.

结论:

  • 这个案例提供了关键的临床数据,支持中长度C9orf72重复扩张的潜在致病性.
  • 这些发现强调了在FTD和ALS的遗传诊断中考虑中间等位基因的重要性.
  • 需要进一步的研究来确定C9orf72重复扩张的致病值.