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Related Concept Videos

The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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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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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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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Development versus Evolution in Cancer Biology.

Fabio Marongiu1, Monica Serra1, Ezio Laconi1

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Cancer development and evolution describe distinct phases of carcinogenesis. Understanding this difference is crucial for advancing cancer research and treatment strategies.

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Area of Science:

  • Oncology
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Carcinogenesis, the process of cancer development, is often described using terms like 'development' and 'evolution'.
  • There is a growing recognition that these terms may have distinct meanings within the context of cancer.
  • Clarifying these definitions is essential for accurate scientific communication and research direction.

Purpose of the Study:

  • To differentiate the concepts of 'development' and 'evolution' as applied to carcinogenesis.
  • To highlight the distinct phases of cancer progression that each term appropriately describes.
  • To underscore the implications of this distinction for cancer research and clinical management.

Main Methods:

  • Review and synthesis of existing evidence on carcinogenesis.
  • Conceptual analysis of the terms 'development' and 'evolution' in the context of cancer.
  • Discussion of the applicability of these concepts to different stages of cancer progression.

Main Results:

  • Evidence suggests 'development' and 'evolution' apply to separate, sequential phases of the multistep carcinogenic process.
  • 'Development' may refer to earlier stages, while 'evolution' pertains to later stages of tumor progression.
  • The distinction provides a more precise framework for understanding cancer initiation and adaptation.

Conclusions:

  • Distinguishing between cancer development and evolution offers a clearer conceptual model for carcinogenesis.
  • This refined understanding has significant implications for targeted therapeutic strategies and cancer prevention.
  • Further research should leverage this distinction to improve the study and management of cancer.