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The Nucleolus02:55

The Nucleolus

The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...

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The NM23 family in development.

Aikaterini Bilitou1, Julie Watson, Anton Gartner

  • 1Department of Oncology, Hutchison/MRC Research Centre, University of Cambridge, Hills Road, Cambridge CB20XZ, UK.

Molecular and Cellular Biochemistry
|May 8, 2009
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The NM23 (non-metastatic 23) gene family, conserved across life, shows functional diversification in vertebrates. Understanding NM23 evolution and its role in development, particularly neural development, is key to cancer research.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Molecular biology

Background:

  • The NM23 (non-metastatic 23) gene family is highly conserved across all domains of life.
  • Vertebrates possess multiple NM23 orthologs, unlike unicellular organisms, indicating gene duplication and functional diversification during evolution.
  • While many NM23 proteins are nucleoside diphosphate kinases (NDP kinases), some exhibit novel functions like protein kinase or transcription factor activity.

Purpose of the Study:

  • To review functional differences and similarities among NM23 family members.
  • To establish orthologous relationships of NM23 members across diverse vertebrate and invertebrate species through phylogenetic analysis.
  • To summarize the role of NM23 proteins in development, with a focus on neural development and implications for cancer.

Main Methods:

  • Phylogenetic analysis of NM23 members across various species, including vertebrates (Xenopus laevis, zebrafish), primitive chordates, and invertebrates.
  • Comparative analysis of structural and functional diversification of NM23 orthologs.
  • Literature review on NM23 protein functions and expression patterns during development.

Main Results:

  • NM23 family members exhibit conserved and divergent functions, including NDP kinase activity, protein kinase, and transcription factor roles.
  • Phylogenetic analysis reveals orthologous relationships and evolutionary patterns of NM23 genes across different taxa.
  • NM23 proteins are involved in various developmental processes, notably neural development, with distinct expression patterns.

Conclusions:

  • The evolution of the NM23 family is characterized by gene duplication and functional diversification, leading to varied roles in development.
  • Understanding the evolutionary trajectory and developmental functions of NM23 proteins is crucial for elucidating their role in human cancer, particularly as metastasis suppressors.
  • Further research into NM23's involvement in development may unlock new insights into cancer pathogenesis.