线粒型变异和积极表观在Saccharomyces物种之间的特征差异中的作用
Jun-Ting Johnson Wang1,2, Ping Ling Priscilla Ng1, Maceo E Powers1
1Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, CA 94720, United States.
Genetics
|October 27, 2025
概括
酵母菌中的线粒体DNA (mtDNA) 变异为高温生长和呼吸提供了部分促进. 这些好处是由核基因增强的,证明基因组合作适应.
科学领域:
- 进化生物学是进化的生物学.
- 遗传学 是一个遗传学.
- 酵母生物学的酵母生物.
背景情况:
- 了解物种分歧机制在进化生物学中至关重要.
- 高温耐受性是Saccharomyces cerevisiae的一个独特特征.
- 酵母耐热性的遗传基础尚未完全理解.
研究的目的:
- 研究线粒体DNA (mtDNA) 变异在酵母热耐性中的作用.
- 确定mtDNA对Saccharomyces cerevisiae独特的高温适应性的贡献.
- 探索核和线粒体基因组在热适应中的相互作用.
主要方法:
- 在酵母中利用了线粒体转基因.
- 在Saccharomyces paradoxus中引入了Saccharomyces cerevisiae线型.
- 在不同温度下评估耐热性和呼吸能力.
主要成果:
- 在S. cerevisiae中,S. cerevisiae线型在S. paradoxus中部分增加了耐热性和呼吸能力.
- 在有益的线粒体等位基因和亲热耐受性核基因型之间观察到积极的表观性.
- 来自S. cerevisiae等位基的高温好处与降低在较低温度下性能的权衡有关.
结论:
- 线粒体等位基可以在酵母中带来显著的健康益处.
- 核和线粒体基因组协同相互作用以促进适应.
- 这种酵母系统说明了线粒基因如何为核基因组所支持的适应性进化做出贡献.
更多相关视频
相关概念视频
02:59Animal Mitochondrial Genetics
9.0K
Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
9.0K
01:09Epistasis Analysis
5.6K
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
5.6K
01:25Genetic Variation
1.2K
Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...
Genes exist in different versions called alleles,...
1.2K
01:39Epistasis
50.1K
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...
50.1K
01:49Multiple Allele Traits
37.9K
The Concept of Multiple Allelism
37.9K
02:19Export of Mitochondrial and Chloroplast Genes
4.1K
A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
4.1K