Insertion sequence

（重定向自IS elements）

An insertion sequence (also known as an IS, an insertion sequence element, or an IS element) is a short DNA sequence that acts as a simple transposable element. Insertion sequences have two major characteristics: they are small relative to other transposable elements (generally around 700 to 2500 bp in length) and only code for proteins implicated in the transposition activity (they are thus different from other transposons, which also carry accessory genes such as antibiotic resistance genes). These proteins are usually the transposase which catalyses the enzymatic reaction allowing the IS to move, and also one regulatory protein which either stimulates or inhibits the transposition activity. The coding region in an insertion sequence is usually flanked by inverted repeats. For example, the well-known IS911 (1250 bp) is flanked by two 36bp inverted repeat extremities and the coding region has two genes partially overlapping orfA and orfAB, coding the transposase (OrfAB) and a regulatory protein (OrfA). A particular insertion sequence may be named according to the form ISn, where n is a number (e.g. IS1, IS2, IS3, IS10, IS50, IS911, IS26 etc.); this is not the only naming scheme used, however. Although insertion sequences are usually discussed in the context of prokaryotic genomes, certain eukaryotic DNA sequences belonging to the family of Tc1/mariner transposable elements may be considered to be, insertion sequences.

单词	IS elements
释义	IS elements 英语例句库 Magnesium is the nutrient element in plant growth. 镁是植物生长的营养要素。 Air is the element of man. 空气是人类的生存环境。 Uranium is a lithophile element. 铀是亲石元素。 Carbon is an element,while carbon dioxide is a compound. 碳是一种(化学)元素,而二氧化碳则是一种化合物。 There is an element of truth in what you say. 你的话有些真实性。 Dispersed repetitive sequence is mainly transposable elements which are composed of transposon and retroposon. 散在重复序列主要是可转移因子,可转移因子分为转座子和返座子两种类型。 Design storm hyetograph is the essential element for hydrologic modeling analysis and storm water drainage design. 摘要设计暴雨雨型对水文模式分析与暴雨排水设计是不可或缺的基本要素。 The result showed that both product of tissue culture and cultispecies contain imperialine which is an essential elements of the alkaloids. 结果表明，不论是组织培养物还是栽培贝母中都含有贝母碱的主要成分――西贝素。 How to extract the magnetocardiography (MCG) signals from the background noises and attenuate the noise is the key element of MCG signal processing. 将心磁信号从干扰噪声中加以提取并有效地消除噪声干扰是心磁信号处理中尤为重要的环节。 Episome is an additional genetic element that can exist either as an autonomous entity or be inserted into the continuity of the chromosome of a host cell. 附加体是能插入寄生细胞连续的染色体之中，也能以自主实体而存在的一种附加遗传因素。原声例句 TED演讲（音频版） 2015年5月合集 Which is a very attractive design element. 这种设计很惹人注目。 VOA慢速英语_健康 Nicotine is an addictive element in tobacco. 尼古丁是烟草中一种令人上瘾的成分。 VOA Daily Standard 2020年12月合集 This is an extremely important element. 这是极其重要的因素。小故事大纪实 All sound is two elements hitting one another. 所有的声音都是两个元素相互碰撞。经济学人（汇总） It is a critical element of Keynesian macroeconomics. 它是凯恩斯宏观经济学的一个重要组成部分。 BBC纪录片《百件藏品话沧桑》 Maybe there is an element, a spiritual element, of hope in this whole thing. 你知道你就是得去寻找这片乐土。 2019 ITERO-The One New Man Fulfilling God’s Purpose He is the very element of the new man. 祂更是这新人的元素。艾玛·沃特森合辑 So I think that is a lovely element as well. 这也是一个非常可爱的元素。战疫特辑 Apart from their family, and that is the key element. 和家人分开，这就是关键。 PBS英语讯息 He said it is " a deplorable element" of the U.S. political system. 他称这是美国政治体制中的糟糕的一面。新概念英语.词汇随身听.第三册 There is a strong element of creativeness in such changes. 这些变革中表现出很强的创造性。 Max带你学发音 " Iron" is also the elements with the chemical symbol Fe. “iron”也是化学符号为 Fe（铁）的元素。 Max带你学发音 " Iron" is also the element with the chemical symbol Fe. “铁”也是化学符号为 Fe 的元素。比尔·盖茨读书论 And there definitely is a rural versus urban element in it. 其中肯定有农村与城市之间的对比。双语版 TED-Ed 演讲精选 And radiation isn't the only cosmic element fungi can withstand. 辐射并不是真菌唯一能抵御的宇宙元素。 CNN 10 学生英语 2018年5/6月合集 Cobalt is a metallic element, atomic number 27 in the period table. 钴是金属元素，原子序数是27。 BBC纪录片《太阳之谜》 It is the simplest and most common element in the universe. 氢是宇宙中最简单也最常见的元素。 VOA慢速英语_科技 Phosphorus is a necessary element for many biological processes on Earth. 磷是地球上许多生命过程所必需的元素。美食家基地 The butter from the buttered baked potato is an important element. 涂了黄油的烤土豆上的黄油是很重要的原料。 VOA慢速英语_美国 Lithium is an important element in the production of electric vehicles. 锂是电动汽车生产中的重要元素。英语百科 Insertion sequence （重定向自IS elements） An insertion sequence (also known as an IS, an insertion sequence element, or an IS element) is a short DNA sequence that acts as a simple transposable element. Insertion sequences have two major characteristics: they are small relative to other transposable elements (generally around 700 to 2500 bp in length) and only code for proteins implicated in the transposition activity (they are thus different from other transposons, which also carry accessory genes such as antibiotic resistance genes). These proteins are usually the transposase which catalyses the enzymatic reaction allowing the IS to move, and also one regulatory protein which either stimulates or inhibits the transposition activity. The coding region in an insertion sequence is usually flanked by inverted repeats. For example, the well-known IS911 (1250 bp) is flanked by two 36bp inverted repeat extremities and the coding region has two genes partially overlapping orfA and orfAB, coding the transposase (OrfAB) and a regulatory protein (OrfA). A particular insertion sequence may be named according to the form ISn, where n is a number (e.g. IS1, IS2, IS3, IS10, IS50, IS911, IS26 etc.); this is not the only naming scheme used, however. Although insertion sequences are usually discussed in the context of prokaryotic genomes, certain eukaryotic DNA sequences belonging to the family of Tc1/mariner transposable elements may be considered to be, insertion sequences.
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