Document Detail


Stem cell proliferation versus meiotic fate decision in Caenorhabditis elegans.
MedLine Citation:
PMID:  22872475     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The C. elegans germ line has emerged as an important model for -understanding how a stem cell population is maintained throughout the life of the animal while still producing the gametes necessary for propagation of the species. The stem cell population in the adult hermaphrodite is relatively large, with stem cells giving rise to daughters that appear intrinsically equivalent; however, some of the daughters retain the proliferative fate while others enter meiotic prophase. While machinery exists for cells to progress through the mitotic cell cycle and machinery exists for cells to progress through meiotic prophase, central to understanding germ line development is identifying the genes and regulatory processes that determine whether the mitotic cell cycle or meiotic prophase machinery will be utilized; in other words, the genes that regulate the switch of germ cells from the proliferative stem cell fate to the meiotic development fate. Whether a germ cell self-renews or enters meiotic prophase is largely determined by its proximity to the distal tip cell (DTC), which is the somatic niche cell that caps the distal end of the gonad. Germ cells close to the DTC have high levels of GLP-1 Notch signaling, which promotes the proliferative fate, while cells further from the DTC have high activity levels of the GLD-1 and GLD-2 redundant RNA regulatory pathways, as well as a third uncharacterized pathway, each of which direct cells to enter meiotic prophase. Other factors and pathways modulate this core genetic pathway, or work in parallel to it, presumably to ensure that a tight balance is maintained between proliferation and meiotic entry.
Authors:
Dave Hansen; Tim Schedl
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Advances in experimental medicine and biology     Volume:  757     ISSN:  0065-2598     ISO Abbreviation:  Adv. Exp. Med. Biol.     Publication Date:  2013  
Date Detail:
Created Date:  2012-08-08     Completed Date:  2012-11-29     Revised Date:  2013-10-17    
Medline Journal Info:
Nlm Unique ID:  0121103     Medline TA:  Adv Exp Med Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  71-99     Citation Subset:  IM    
Affiliation:
Department of Biological Sciences, University of Calgary, Calgary, AB, Canada. dhansen@ucalgary.ca
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MeSH Terms
Descriptor/Qualifier:
Animals
Caenorhabditis elegans / cytology*,  growth & development
Cell Proliferation*
Meiosis / physiology*
Stem Cells / cytology*
Grant Support
ID/Acronym/Agency:
R01 GM085150/GM/NIGMS NIH HHS; R01 GM085150/GM/NIGMS NIH HHS; //Canadian Institutes of Health Research
Comments/Corrections

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