Document Detail

Cellular and molecular processes leading to embryo formation in sponges: evidences for high conservation of processes throughout animal evolution.
MedLine Citation:
PMID:  22543423     Owner:  NLM     Status:  Publisher    
The emergence of multicellularity is regarded as one of the major evolutionary events of life. This transition unicellularity/pluricellularity was acquired independently several times (King 2004). The acquisition of multicellularity implies the emergence of cellular cohesion and means of communication, as well as molecular mechanisms enabling the control of morphogenesis and body plan patterning. Some of these molecular tools seem to have predated the acquisition of multicellularity while others are regarded as the acquisition of specific lineages. Morphogenesis consists in the spatial migration of cells or cell layers during embryonic development, metamorphosis, asexual reproduction, growth, and regeneration, resulting in the formation and patterning of a body. In this paper, our aim is to review what is currently known concerning basal metazoans-sponges' morphogenesis from the tissular, cellular, and molecular points of view-and what remains to elucidate. Our review attempts to show that morphogenetic processes found in sponges are as diverse and complex as those found in other animals. In true epithelial sponges (Homoscleromorpha), as well as in others, we find similar cell/layer movements, cellular shape changes involved in major morphogenetic processes such as embryogenesis or larval metamorphosis. Thus, sponges can provide information enabling us to better understand early animal evolution at the molecular level but also at the cell/cell layer level. Indeed, comparison of molecular tools will only be of value if accompanied by functional data and expression studies during morphogenetic processes.
Alexander V Ereskovsky; Emmanuelle Renard; Carole Borchiellini
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-29
Journal Detail:
Title:  Development genes and evolution     Volume:  -     ISSN:  1432-041X     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9613264     Medline TA:  Dev Genes Evol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Mediterranean Institute of Biodiversity and Ecology Marine and Continental (IMBE), UMR 7263, CNRS Aix-Marseille University, Station marine d'Endoume, 13007, Marseille, France,
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