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Updated: Dec 12, 2025

Genome Editing in Astyanax mexicanus Using Transcription Activator-like Effector Nucleases TALENs
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Genome Editing in Astyanax mexicanus Using Transcription Activator-like Effector Nucleases TALENs

Published on: June 20, 2016

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トワタラ の ゲノム は 胎児 の 進化 の 古代 の 特徴 を 明らか に し て い ます

Neil J Gemmell1, Kim Rutherford2, Stefan Prost3,4

  • 1Department of Anatomy, University of Otago, Dunedin, New Zealand. neil.gemmell@otago.ac.nz.

Nature
|August 8, 2020
PubMed
まとめ

トワタラのゲノムは 脊椎動物の最大のゲノムの一つで 古代の爬虫類とのリンクとして 独特の進化的位置を示しています この配列は ツァータラの生物学と保全に関する洞察を 提供しています

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Phylogeny01:23

Phylogeny

Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
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Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Genome Size and the Evolution of New Genes

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Synteny and Evolution

John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
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