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相关概念视频

Sex-linked Disorders01:43

Sex-linked Disorders

Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
Gene Conversion02:08

Gene Conversion

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...
The Ratio of X Chromosome to Autosomes02:45

The Ratio of X Chromosome to Autosomes

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 Drosophila...
Sex Linked Disorders01:43

Sex Linked Disorders

Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
Dosage Compensation02:50

Dosage Compensation

In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with  distinct numbers of X chromosomes will have...
Gene Conversion02:08

Gene Conversion

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...

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相关实验视频

Updated: Jul 12, 2026

Recombineering Homologous Recombination Constructs in Drosophila
14:23

Recombineering Homologous Recombination Constructs in Drosophila

Published on: July 13, 2013

德罗斯菲拉Dscam的替代拼接会产生轴突引导受体,这些受体表现出异构体特异的同性恋结合.

Woj M Wojtowicz1, John J Flanagan, S Sean Millard

  • 1Howard Hughes Medical Institute, Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Cell
|September 2, 2004
PubMed
概括

唐氏综合症细胞粘附分子 (DSCAM) 异型表现出独特的自我结合特性. 在DSCAM蛋白相互作用中的这种特异性对于形成Drosophila.com中复杂的神经连接至关重要.

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Manipulation of Ploidy in Caenorhabditis elegans
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Manipulation of Ploidy in Caenorhabditis elegans

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Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
07:55

Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae

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相关实验视频

Last Updated: Jul 12, 2026

Recombineering Homologous Recombination Constructs in Drosophila
14:23

Recombineering Homologous Recombination Constructs in Drosophila

Published on: July 13, 2013

Manipulation of Ploidy in Caenorhabditis elegans
07:54

Manipulation of Ploidy in Caenorhabditis elegans

Published on: March 15, 2018

Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
07:55

Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae

Published on: September 11, 2022

科学领域:

  • 神经科学是一个神经科学.
  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.

背景情况:

  • 唐氏综合征细胞粘附分子 (DSCAM) 对于Drosophila的神经元发育至关重要.
  • Dscam的替代拼接产生了大量的异型,可能超过38,000个.
  • 这些异构体在其细胞外域的特定区域有所不同.

研究的目的:

  • 为了研究不同Dscam异型的结合特异性.
  • 为了确定DSCAM结构的变化如何与异形函数相关.
  • 了解DSCAM异形结合在神经电线中的作用.

主要方法:

  • 分析各种Dscam异型体之间的结合相互作用.
  • 在不同异构体中比较可变区域的氨基酸序列.
  • 使用Drosophila作为模型生物来研究神经元连接.

主要成果:

  • Dscam异型表现出高度特异的同性恋结合,优先与自身相互作用.
  • 结合特异性是由三个可变免疫球蛋白 (Ig) 域内的氨基酸序列决定的.
  • 密切相关的异构体之间即使是微小的序列差异也会导致不同的结合特性.

结论:

  • Dscam异形特异性同型结合是调节细胞与细胞相互作用的关键机制.
  • 这种特异性有助于精确形成复杂的神经电路.
  • Dscam的替代拼接提供了一个产生神经连接所必需的分子多样性的机制.