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Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
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序列多样性在怀孕早期丢失.

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科学领域:

  • 遗传学 是一个遗传学.
  • 生殖生物学 生殖生物学
  • 基因组医学是基因组医学.

背景情况:

  • 生殖线突变是遗传的,在受精之前就发生了.
  • 德诺沃突变 (DNM) 已经得到了很好的研究,其中大多数起源于父亲.
  • 早期怀孕流产的研究不足,已知原因或干预措施很少.

研究的目的:

  • 了解早期妊娠损失的序列多样性和遗传原因.
  • 为了研究介质重组和妊娠损失中的点突变之间的相互作用.
  • 从临床诊断的妊娠流产病例中分析三位一体 (母亲,父亲,胎儿).

主要方法:

  • 全基因组测序 (WGS) 的664个早期怀孕丧失病例 (1439胎儿样本,467个三组).
  • 评估形状,新复制数变异 (CNVs) 和单位变异 (SSVs).
  • 分析突变起源 (父亲与母亲) 和重组失败.

主要成果:

  • 在206例病例中检测到状体 (最常见的是:单体X,三体16).
  • 在14个案例中发现了19个新的大型CNV.
  • 在26个基因型中发现了致病或可能致病的SSV,与对照组相比,早期妊娠损失的频率更高.
  • 在467例中254例中确定了可能的遗传原因.
  • 大多数遗传原因都源于母亲的染色体.
  • 三胞胎胎的DNM显著比euploid胎儿更多.
  • 证实了对DNM的高父贡献,在三倍体中具有特定的模式.

结论:

  • 显著的序列多样性有助于早期妊娠损失.
  • 遗传因素,包括动脉增生症,三倍增生症,致病性SSV和de novo CNV,解释了早期怀孕损失的很大一部分.
  • 大多数已识别的遗传原因都源于母亲的染色体.
  • 对非遗传原因和潜在干预措施需要进一步研究.