相关实验视频
Updated: Jul 8, 2026

13:06
In Ovo Electroporations of HH Stage 10 Chicken Embryos
Published on: November 1, 2007
概括
蛋蛋白基因包含六个中间序列,这些序列中断了信使编码区域. 这些非编码DNA序列位于基因内,使得染色体DNA比最终信使RNA长得多.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 基因表达 基因表达
背景情况:
- 之前的研究发现了卵蛋白基因中断.
- 了解基因结构对于破译基因表达机制至关重要.
研究的目的:
- 为了进一步调查和描述卵蛋白基因中的中断.
- 为了确定卵蛋白基因中中间序列的数量和位置.
主要方法:
- 对DNA序列和基因结构的分析.
- 基因组织与信使RNA (mRNA) 和互补DNA (cDNA) 的比较.
主要成果:
- 在卵蛋白基因中,有六个中间序列的证据.
- 所有中间序列都位于与mRNA的氨基酸编码部分相对应的区域.
- 七个编码片段是线性排列,在相同的方向.
- 卵泡蛋白mRNA的完整编码序列包含在6000bp的染色体DNA区域内,超过mRNA长度的三倍.
结论:
- 卵泡蛋白基因是一种'分裂基因',具有多个中间序列.
- 染色体基因中的广泛的非编码DNA突出显示了真核生物基因结构和成熟的mRNA之间的差异.
相关概念视频
Organization of Genes
Overview
Organization of Genes
Overview
Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Structure of a Gene
A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
However, only 1% of the DNA is composed of genes that encode proteins; the rest, 99% is non-coding DNA. This non-coding DNA performs...
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Prokaryotic Gene Structure and Organization
Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...

