相关实验视频

Updated: Jan 15, 2026

Preparation of Meiotic Chromosome Spreads from Zebrafish Spermatocytes

Preparation of Meiotic Chromosome Spreads from Zebrafish Spermatocytes

Published on: March 3, 2020

在东非辐射之前:基底平分类类的基因染色体系统

Kristen A Behrens¹, Zexuan Zhao¹, Michael R Kidd²

¹Department of Biology, University of Maryland, College Park, MD 20742, USA.

Genome biology and evolution

|October 9, 2025

概括

鱼的性别染色体显示出非洲部落的快速转换和多样化的系统. 这项研究揭示了类动物性决定的多个独立起源和进化模式,挑战了以前的基因假设.

科学领域:

进化生物学是进化的生物学.
基因组学就是基因组学.
鱼类学鱼类学鱼类学

背景情况:

东非鱼表现出了显著的多样化和高性染色体循环率.
研究鱼的性染色体进化为我们提供了关于物种化和适应性的见解.
以前的研究表明,某些性别决定系统的特定基因 (figla,banf2).

研究的目的:

研究了几种甲虫部落 (Tilapiini,Coptodonini,Heterotilapiini,Gobiocichlini,Pelmatolapiini,Oreochromini) 性染色体的演变情况.
识别性别染色体及其在这些血统中的进化模式.
评估候选基因,并提出新的性别决定机制.

主要方法:

组装Pelmatotilapia mariae (雄性和雌性) 的染色体规模基因组.
映射聚合测序从多个物种读取,以识别性别染色体.
分析了性别确定系统的遗传学分布.

主要成果:

在P. mariae中确定了LG3上的ZW系统,在其他物种中共享了LG3上的XY系统.
在一些物种的LG1上发现了XY系统,在其他物种的LG14和LG20上发现了XY系统.
遗传学分析表明,与湖泊水相比,一些血统的周转速度较慢.
数据与figla和banf2作为LG1XY和LG3ZW系统的候选基因相矛盾.

结论:

在类动物中,性别染色体的循环复杂,具有多个独立的起源和不同的速度.
在LG3.3上,Ubiquitination被提出为XY系统的潜在机制.
需要进一步的研究,才能充分了解鱼的性别决定的遗传基础.

关键词:

鱼鱼是一种鱼.基因组组装组合的基因组.性染色体的周转率

更多相关视频

Ploidy Manipulation of Zebrafish Embryos with Heat Shock 2 Treatment

Ploidy Manipulation of Zebrafish Embryos with Heat Shock 2 Treatment

Published on: December 16, 2016

Dissection of Larval Zebrafish Gonadal Tissue

Dissection of Larval Zebrafish Gonadal Tissue

Published on: April 26, 2017

相关概念视频

Lampbrush Chromosomes

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...

Lampbrush Chromosomes

Lampbrush Chromosomes

Speciation Rates

Speciation Rates

The Y Chromosome Determines Maleness

The Y Chromosome Determines Maleness

The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size....

The Ratio of X Chromosome to Autosomes

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...

Hybrid Zones

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.