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Related Experiment Videos

Endopolyploidy as a morphogenetic factor of development.

Alim P Anisimov1

  • 1Department of Cell Biology, Far Eastern National University, 8 Sukhanov str., Vladivostok 690950, Russia. alim@bio.dvgu.ru

Cell Biology International
|November 30, 2005
PubMed
Summary

Endopolyploidy, the process of polyploid cell formation within tissues, is a key adaptive factor in organism development and evolution. This study examines its role in mollusks, revealing increased significance in gastropod phylogenesis and proposing a universal interpretation as endoclones.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Evolutionary Biology
  • Molluscan Biology

Background:

  • Endopolyploidy, the increase in chromosome sets within somatic cells, is a known phenomenon in the histogenesis of various organisms.
  • Its role in tissue development and evolutionary adaptation is widely recognized but requires a unified interpretation.
  • Previous studies have explored endopolyploidy in diverse species, including mollusks.

Purpose of the Study:

  • To summarize and appraise research on endopolyploidy in mollusks, focusing on ontogenetic and phylogenetic aspects.
  • To investigate the occurrence and significance of polyploid cells in glandular tissues and ganglia of bivalve and gastropod species.
  • To propose a universal interpretation of endopolyploidy and its evolutionary implications.

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Main Methods:

  • Review of published works on endopolyploidy in mollusks.
  • Detailed examination of endomitosis in the snail *Succinea lauta*.
  • Survey of polyploid cell presence in glandular tissues and ganglia of 29 bivalve and 82 gastropod species.

Main Results:

  • Demonstrated a sequence of mitotic events in *Succinea lauta*, progressing from normal mitosis to restitutional and then endomitosis.
  • Found ordinary diploid cells in bivalve tissues but observed an increasing role of polyploidy in gastropod tissue development during phylogenesis.
  • Proposed viewing individual polyploid cells as 'endoclones' and their evolution as 'oligomerization' at the cell-tissue level.

Conclusions:

  • Endopolyploidy is an adaptive morphogenetic factor, contributing to functional intensification, genome reliability, and developmental acceleration.
  • The evolutionary transformation of diploid clones into polyploid endoclones parallels Dogel's oligomerization theory.
  • Endopolyploidy serves as an integrative regulatory mechanism and an important evolutionary factor driven by natural selection, with its specific role varying by tissue and organism.