Zip2は,染色体シナプシスの開始に必要なメオシス特有のタンパク質です
1Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520-8103, USA.
Cell
|May 20, 1998
まとめ
Saccharomyces cerevisiae ZIP2遺伝子は,シナプトネマ複合体の形成に不可欠なメオシス特異のタンパク質をコードする. Zip2タンパク質の局所化は中性再結合に依存し,同類の染色体シナプスを確保します.
科学分野:
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
背景:
- メイオシスには,同類の染色体配列とシナプスが含まれており,正確な遺伝的分離に不可欠です.
- シナプトネマル複合体は,シナプスを促進するタンパク質構造です.
- シナプスを開始する分子機構は,まだ完全に理解されていません.
研究 の 目的:
- サッカロマイケス・セレヴィシアのZIP2遺伝子とその暗号化されたタンパク質を特定し,特徴づけること.
- 中間染色体シナプスとシナプトネマル複合体の形成におけるZip2タンパク質の役割を明らかにする.
主な方法:
- Saccharomyces cerevisiaeの遺伝子識別と特徴付けについて.
- zip2変異体におけるメオティック現象型の分析.
- 中性染色体におけるZip2タンパク質の免疫局所化.
- 介質再結合と二重鎖断裂修復に関連したZip2p局所化の調査.
主要な成果:
- ZIP2遺伝子は,Zip2pという新種のメオシス特異タンパク質をコードする.
- Zip2pはシナプトネマル複合体の形成に不可欠であり,zip2変異体は同類のペアリングを示すが,シナプスは欠けている.
- Zip2pは,シナプスの開始部位の焦点に局所化し,中性再結合を必要とします.
- Zip2pは二重鎖断裂修復タンパク質とコロカライズし,再結合依存シナプスの役割を示唆しています.
結論:
- Zip2pは,微分化の過程で染色体シナプスの開始を促進します.
- Zip2pを同同異性染色体間再結合の部位に定着させることで,同異性染色体間の適切なシナプスが確保されます.
関連する概念動画
01:49Meiosis I
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 a...
01:57Meiosis II
Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each containing...
03:09Meiosis I
Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
02:02Meiosis II
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
03:09Meiosis I
Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
02:02Meiosis II
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...