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Updated: Jul 3, 2025

2D and 3D Chromosome Painting in Malaria Mosquitoes
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了解子 (Aves, Cuculiformes) 的染色体进化:通过不寻常的重新排列进行的旅程

Rafael Kretschmer1,2, Marcelo Santos de Souza3, Ricardo José Gunski3

  • 1School of Biosciences, University of Kent, Canterbury, Kent, CT2 7NJ, UK.

Genome
|February 12, 2024
PubMed
概括

对Cuculiformes的比较染色体分析揭示了松鼠 (Piaya cayana) 的广泛基因组重组. 在瓜拉 (Guira guira) 和平嘴 (Crotophaga ani) 中存在一个Z-自体罗伯逊转位,但不是P. cayana.

关键词:
鸟类 鸟类 鸟类 鸟类 鸟类染色体的重新安排.基因组的演化 基因组的演化不同色彩的多态性多态性.性染色体的性别染色体

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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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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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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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Exon Recombination02:32

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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. 
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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.
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