维护核子替代:为不断变化的世界促进了线粒体的适应
1Department of Integrative Biology The University of Texas at Austin Austin Texas USA.
Evolutionary applications
|March 12, 2024
概括
由于有限的遗传变异和人类的影响,物种难以适应气候变化. 辅助进化,如保护型核基因替代 (CmNR),可以引入有益的线粒体和核基因,以帮助物种生存.
科学领域:
- 进化生物学是进化的生物学.
- 保护遗传学 保护遗传学
- 基因组学就是基因组学.
背景情况:
- 由于遗传变异不足和息地碎片化等人为压力,物种在适应快速气候变化方面面临重大挑战.
- 线粒体基因组,编码核心代谢基因,对于环境耐受性至关重要,并与核基因相互作用,形成共适应的线粒体核复合体.
- 这些线粒细胞相互作用可以作为生殖障碍,但也为适应性侵入提供了途径.
研究的目的:
- 面对气候变化,解决自然适应的局限性.
- 提出一种新的促进适应技术 - - 保护性线核替代 (CmNR) - - 以提高物种的适应潜力.
- 突出 mitoonuclear 基因变异性在保护战略中的重要性.
主要方法:
- 审查线粒体基因组和线粒体相互作用在适应中的作用.
- 作为一种引入适应性遗传变异的方法,提出保护性核子替代 (CmNR).
- 建议基于CRISPR的核基因编辑,线粒体替代和辅助生殖技术的组合用于CMNR.
主要成果:
- 大多数物种缺乏必要的遗传变异和进化速度来应对气候变化.
- 人类因素通过限制基因流和遗传多样性,进一步降低了适应潜力.
- 线粒体基因组可以自适应地侵入内部,可能带来兼容的核基因.
结论:
- 促进适应,特别是通过CmNR,为无法自然适应气候变化的物种提供了潜在的解决方案.
- 保守型核基因替代 (CmNR) 可以通过替换线粒体基因组和关键核位点来保护表型,同时提高适应能力.
- 这种技术对保护受威胁种群具有前景,特别是在像山顶这样快速变化的环境中.
相关概念视频
02:59Animal Mitochondrial Genetics
7.6K
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...
7.6K
01:45Mitochondrial Membranes
10.3K
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
10.3K
02:19Export of Mitochondrial and Chloroplast Genes
3.7K
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...
3.7K
01:19Translocation of Proteins into the Mitochondria
3.1K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
3.1K
01:37Mitochondria
12.5K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
12.5K
01:46Electron Transport Chain: Complex I and II
13.3K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
13.3K