相关实验视频
Updated: Jun 30, 2025
05:34
Sexual Crosses with the Mucoromycete Phycomyces blakesleeanus
Published on: June 6, 2025
77
基因组生物学和在四种谷物菌中的交配类型位点的演化
Zhenyan Luo1, Alistair McTaggart2, Benjamin Schwessinger1
1Research Biology School, Australian National University, Canberra, ACT, Australia.
PLoS genetics
|March 18, 2024
概括
研究人员研究了四种Puccinia物种的交配类型 (MAT) 位点,发现PR位点附近的重组抑制与基因组退化相关. 这种理解有助于预测重要农业植物病原体的病原体演变和毒性.
科学领域:
- 遗传学和基因组学 遗传学和基因组学
- 菌类学 菌类学是指菌类学.
- 植物病理学 植物病理学
背景情况:
- 永久性的异合体位点,如交配类型 (MAT) 区域,通常显示抑制的重组和基因组退化.
- 在Basidiomycota中,交配兼容性涉及两个编码本地主体 (HD) 转录因子的位点和费罗蒙受体 (Pra) - 连接体等位基因.
- 对Pucciniales缺乏MAT位点的基因组级分析,这是一个重要的植物病原体群.
研究的目的:
- 分析四种对麦和小麦致病的Puccinia物种的基因组级交配型 (MAT) 位点.
- 调查在MAT位置上的重组抑制,基因组退化和等位基因多样性之间的关系.
- 探索MAT基因在无性感染周期中的表达和潜在作用.
主要方法:
- 在四个Puccinia物种 (P. coronata,P. graminis,P. triticina,P. striiformis) 中对MAT位点进行比较基因组分析.
- 评估合成性保护,重组抑制信号和基因组退化.
- 在无性感染周期期间对MAT基因的基因表达分析.
主要成果:
- MAT位点位于两个单独的染色体上,支持Pucciniales的四极交配系统.
- HD基因是多样性的,而PR位点主要是双样性的,而P. graminis可能具有多个等位基因.
- 在具有双性PR位点的物种中,观察到靠近PR位点的重组抑制和基因组退化.
结论:
- 在Puccinia物种中,重组抑制,基因组退化和MAT基因位基因元多样性之间存在联系.
- 在无性感染周期中,MAT基因表达,可能调节核维护和配对.
- 了解Puccinia的MAT位点进化有助于预测病原体进化,毒性和管理农业疾病.
相关概念视频
01:28Yeast Signaling
14.6K
Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
14.6K
02:39Gene Flow
35.1K
Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
35.1K
01:21Frequency-dependent Selection
22.0K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
22.0K
02:38Asexual Reproduction
31.2K
Asexual reproduction allows plants to reproduce without growing flowers, attracting pollinators, or dispersing seeds. Offspring are genetically identical to the parent and produced without the fusion of male and female gametes.
31.2K
01:18Dihybrid Crosses
74.8K
Overview
74.8K
02:54Evolutionary Relationships through Genome Comparisons
5.7K
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
5.7K