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相关概念视频

Histone Variants at the Centromere02:30

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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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超细粒状失角化 - 阿尔巴变种

C K SriRam1, A S Krishnaram1, I Shibani1

  • 1From the Department of Dermatology, Venereology and Leprosy, Velammal Medical College, Madurai, Tamil Nadu, India.

Indian journal of dermatology
|January 26, 2026
PubMed
概括
此摘要是机器生成的。

超细粒状角膜异位 (HGD) 是一种罕见的皮肤病,通过组织学诊断. 这一案例突出显示,HGD呈现出不寻常的色素丧失,这一发现在医学文献中以前没有被记录.

关键词:
没有颜色的结节.过质的角质变异.克拉托亚林颗粒是什么 克拉托亚林颗粒在白风,白风.

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科学领域:

  • 皮肤病理学 皮肤病理学
  • 组织病理学 组织病理学
  • 在瘤学瘤学.

背景情况:

  • 超细粒细胞失角化 (hypergranulotic dyscornification,简称HGD) 是一种通过异常的角质细胞成熟而表现出的组织病理反应模式.
  • HGD缺乏特定的临床表现,因此组织学检查对于诊断至关重要.
  • 该病症的罕见性和各种表现需要进一步报告病例.

研究的目的:

  • 报告一个69岁的男性患者罕见的HGD病例.
  • 调查与HGD相关的脱色的根本原因.
  • 在这个独特的介绍中记录了他的病理学和免疫组织化学发现.

主要方法:

  • 一个患有无症状色素脱落斑块和结节的患者的临床表现分析.
  • 皮肤病变的组织病理学检查,以确定HGD特征.
  • 特殊染色剂 (Fontana Masson) 和免疫组织化学 (HMB-45) 用于评估黑色素细胞的存在.

主要成果:

  • 组织病理学证实了HGD,排除了诸如疹或斑疹角质炎之类的临时诊断.
  • 丰塔纳·马森染色剂和HMB-45免疫组织化学检测显示,受伤皮肤中的黑色素细胞有显著的损失.
  • 观察到的色素丧失与受影响区域的黑色素细胞损失直接相关.

结论:

  • 这种病例代表了一种罕见的HGD呈现,由于黑色素细胞损失而导致的相关色素丧失.
  • 这些发现扩大了对HGD潜在临床谱的理解.
  • 需要进一步的研究来探索HGD,HGD Albicans和白风之间的潜在联系.