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相关概念视频

Meiosis I01:49

Meiosis I

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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
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X and Y Chromosomes02:32

X and Y Chromosomes

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Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
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Karyotyping01:17

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Overview
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Sex-linked Disorders01:43

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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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The Ratio of X Chromosome to Autosomes02:45

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In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
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Updated: Sep 16, 2025

Generation of Induced Pluripotent Stem Cells from Turner Syndrome 45XO Fetal Cells for Downstream Modelling of Neurological Deficits Associated with the Syndrome
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这是特纳综合征.

Ken L Wan1, Emma L Brown1, Raj Krishnaswamy1

  • 1Department of Diagnostic Genomics, Monash Health Pathology, Monash Medical Centre Clayton, Clayton, Victoria, Australia.

Journal of paediatrics and child health
|July 11, 2025
PubMed
概括
此摘要是机器生成的。

特纳综合征 (TS) 是一种性染色体疾病,女性的特征是缺失或部分缺失X染色体. 本综述详细介绍了TS核型,临床特征以及这种遗传疾病的管理策略.

关键词:
图纳综合征是特纳综合征的一种症状.对特纳综合征的临床管理.细胞遗传学 细胞遗传学图纳综合征的遗传基础是什么基因检测 基因检测是指基因检测.用于测试特纳综合征的指示.单体 X 单体 X 单体正常的性别染色体损失是正常的.

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科学领域:

  • 遗传学 是一个遗传学.
  • 内分泌学 在内分泌学.
  • 生殖医学 生殖医学

背景情况:

  • 特纳综合征 (TS) 是一种影响表型女性的染色体疾病,其特点是第二个性染色体全部或部分缺失.
  • 一个世纪前首次描述,其细胞遗传基础是在1959年建立的.
  • TS表现出一系列的核型,包括X单体,马赛克,X同染色体和X环.

研究的目的:

  • 审查特纳综合征遗传检测的临床指示.
  • 描述用于诊断TS的各种细胞遗传测试方法.
  • 总结临床管理选择,并讨论与年龄相关的性染色体损失.

主要方法:

  • 对现有关于特纳综合征的文献进行审查.
  • 对细胞遗传数据和型变异的分析.
  • 临床表型和管理指南的汇编.

主要成果:

  • 转基因结核类型多样化,X单体是最常见的 (40%-50%).
  • 父亲X染色体在约75%的TS病例中不存在,尽管父母的血统在常规护理中没有临床意义.
  • 常见的产后表型包括身材矮小,青春期延迟,卵巢发育不良,不孕症和相关的医疗条件.

结论:

  • 特纳综合征的诊断依赖于识别特定的X染色体异常.
  • 管理包括解决矮身,青春期延迟和相关的医学并发症.
  • 了解TS型复杂性对于准确的诊断和量身定制的患者护理至关重要.