合成染色体融合:对线粒体和介质体基因组结构和功能的影响
Jingchuan Luo1,2, Luis A Vale-Silva3, Adhithi R Raghavan3
1Institute for Systems Genetics and Department of Biochemistry and Molecular Pharmacology, NYU Langone Health, New York, NY 10016, USA.
Cell genomics
|November 29, 2023
概括
科学家们在酵母中创造了一个合成染色体I (synI),它比自然染色体I短. 这种合成染色体与 synIII 融合后,形成了第一个合成酵母融合染色体,揭示了新的生物学见解.
科学领域:
- 合成基因组学 合成基因组学
- 酵母遗传学 酵母遗传学
- 染色体生物学 染色体生物学
背景情况:
- 在Saccharomyces cerevisiae中,最小的染色体chrI,由于其尺寸,提出了独特的挑战.
- 合成染色体为研究染色体稳定性和功能提供了一种新的方法.
- 之前的研究还没有探索融合合成染色体的产生和行为.
研究的目的:
- 设计和合成一种功能性,较短的酵母染色体I (synI) 版本.
- 通过将synI与synIII连接,创建第一个酵母融合染色体.
- 研究合成融合染色体的结构和功能性质,包括它们在核过程和半分裂中的作用.
主要方法:
- 设计和合成synI,一个染色体大约比原生ChrI短21.6%.
- 合成I与synIII的融合产生了第一个合成酵母融合染色体.
- 构建额外的融合染色体 (chrIII-I,chrIX-III-I) 用于核功能研究.
- 对染色体结构的分析,对沉默蛋白Sir3的依赖,以及对中介性交叉蛋白Red1沉积的中间体/中间体效应.
主要成果:
- 成功合成synI及其与synIII的融合,创造了第一个合成酵母融合染色体.
- 融合染色体chrIII-I和chrIX-III-I表现出依赖于沉默蛋白Sir3.3的扭曲结构.
- 融合染色体中的中粒体缺失揭示了核心中粒体和周周中粒体在调节Red1沉积中的对立作用.
- 这些中心体效应促进了不成比例的Red1丰富和小染色体的交叉潜力,如ChrI.
结论:
- 合成基因组学提供了强大的工具来揭示新的生物机制和剖析复杂的系统.
- 这项研究证明了在酵母中创建和分析合成融合染色体的可行性.
- 这些发现突出了介质交叉和染色体结构与染色体大小和中心元素相关的复杂调节.
相关概念视频
Crossing Over
147.0K
Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
147.0K
Meiosis I
193.7K
Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
193.7K
Meiosis vs. Mitosis
56.4K
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
56.4K
Nondisjunction
75.7K
During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
75.7K
Duplication of Chromatin Structure
5.5K
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
5.5K
Gene Conversion
9.8K
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
9.8K


