在人类mtDNA的复制控制区域中,依赖于衰老的大规模积累点突变,用于复制
Y Michikawa1, F Mazzucchelli, N Bresolin
1Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA.
概括
线粒体DNA (mtDNA) 突变随着年龄的增长而累积,特别是在特定的复制控制区域. 这些与年龄相关的mtDNA变化在生命的晚期出现,并且可以在细胞内广泛传播.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 衰老研究研究 衰老研究
背景情况:
- 线粒体DNA (mtDNA) 损伤是衰老的一个被提议的贡献者.
- 之前的研究发现mtDNA的变化有限,与衰老理论产生差异.
- 在衰老过程中mtDNA突变的作用需要进一步研究.
相关概念视频
Replication in Eukaryotes
Overview
Replication in Eukaryotes
Overview
Animal Mitochondrial Genetics
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...
Genome Copying Errors
DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their survival. Therefore, the copying errors are checked and repaired at three levels.
Replication in Eukaryotes
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Replication in Eukaryotes
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...


