相关实验视频
Updated: May 7, 2026

00:08
Analysis of Circadian Photoresponses in Drosophila Using Locomotor Activity
1.5K
德洛索菲拉的时钟基因双重编码一种与人类氨酸激酶Iepsilon密切相关的蛋白质
1Laboratory of Genetics and National Science Foundation Science and Technology Center for Biological Timing, The Rockefeller University, New York, New York 10021, USA.
Cell
|July 23, 1998
概括
双倍时间 (dbt) 基因产物,双倍时间蛋白 (DBT) 对于调节多虫昼夜节律至关重要. DBT在物理上与PER蛋白相互作用,影响其酸化和积累,以控制日常循环.
科学领域:
- 时间生物学 时间生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 循环节律是内生生物过程,调节日常循环.
- 德罗斯菲拉 (Drosophila melanogaster) 模型系统被广泛用于研究昼夜节律的遗传和分子基础.
- 已知包括PER和TIM在内的关键时钟蛋白经历了翻译后的修改,调节了它们的稳定性和功能.
研究的目的:
- 克隆和表征双重时间 (dbt) 基因及其蛋白质产物 (DBT).
- 研究DBT在Drosophila昼夜节律调节中的作用.
- 阐明DBT与昼夜钟组件相互作用的分子机制.
主要方法:
- 基因克隆和双重时间 (dbt) 基因的测序.
- 分析影响昼夜节律的dbt突变 (dbtS,dbtL,dbtP).
- 使用体外和体内试验 (例如,共免疫沉) 的蛋白质与蛋白质相互作用研究.
主要成果:
- 克隆了双倍时间 (dbt) 基因,其蛋白质产物 (DBT) 被确定为同类于人类氨酸激酶 Iepsilon.
- 特定的dbt突变 (dbtS,dbtL) 改变了昼夜节律的周期长度,导致单氨基酸变化在保存的激酶区域.
- dbtP突变体表现出废除的节奏和改变的PER蛋白酸化,与减少的dbt表达相关. 已证明DBT在体外和体内都能结合PER.
结论:
- DBT是Drosophila昼夜时钟的关键组成部分,作为激酶起作用.
- DBT和PER蛋白之间的物理相互作用对于调节PER酸化和积累至关重要,从而控制昼夜节律.
- DBT的激酶活性及其与PER的相互作用为昼夜时钟提供了一个关键的调节机制.
相关概念视频
Polytene Chromosomes
9.3K
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
9.3K
The Ratio of X Chromosome to Autosomes
11.6K
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
11.6K
Circadian Rhythms and Gene Regulation
3.4K
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
3.4K

