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Related Concept Videos

Synteny and Evolution02:31

Synteny and Evolution

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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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Cellular Differentiation00:57

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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
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Gene Evolution - Fast or Slow?02:05

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Gene Duplication and Divergence02:37

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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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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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.
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Updated: May 28, 2025

A Bioinformatics Pipeline for Investigating Molecular Evolution and Gene Expression using RNA-seq
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Theoretical thinking from gene evolution to cell type evolution.

Li Zhang1, Chuan-Yun Li2

  • 1Chinese Institute for Brain Research, Beijing 102206, China.

Yi Chuan = Hereditas
|February 10, 2025
PubMed
Summary
This summary is machine-generated.

Evolutionary biology needs an update. This review proposes a framework for cell type evolution, moving beyond gene-centric views to explain how cell types arise and persist through selection and environmental factors.

Keywords:
cell type evolutiongene evolutionnatural selectionrandom mutation

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Area of Science:

  • Evolutionary Biology
  • Cellular Biology
  • Genetics

Background:

  • Traditional evolutionary theory focuses on genetic mutations and selection at multiple levels.
  • Somatic mutations are typically considered in specific contexts like cancer and aging.
  • Phenotypes result from genotype-environment interactions, but mechanisms at the cellular level are unclear.

Purpose of the Study:

  • To propose a shift from gene-centric evolution to a framework for cell type evolution.
  • To integrate understanding of genotypic and environmental influences on cell type formation.
  • To update the theoretical system of evolutionary biology.

Main Methods:

  • Review of current evolutionary biology and genetics literature.
  • Analysis of genotype-phenotype relationships at the cellular level.
  • Synthesis of concepts from molecular, cellular, and evolutionary sciences.

Main Results:

  • Current models do not fully explain how new cell types are created and fixed.
  • Selection operates across multiple biological levels, including cells.
  • Environmental factors interact with genetic factors to shape cellular evolution.

Conclusions:

  • A new theoretical framework for cell type evolution is needed.
  • Moving beyond gene evolution is crucial for a comprehensive understanding of life's diversity.
  • Integrating cellular mechanisms into evolutionary theory will advance the field.