Document Detail

Centrosome inheritance in the parthenogenetic egg of the collembolan Folsomia candida.
MedLine Citation:
PMID:  16906420     Owner:  NLM     Status:  MEDLINE    
Unfertilized eggs commonly lack centrioles, which are usually provided by the male gamete at fertilization, and are unable to assemble functional reproducing centrosomes. However, some insect species lay eggs that develop to adulthood without a contribution from sperm. We report that the oocyte of the parthenogenetic collembolan Folsomia candida is able to self-assemble microtubule-based asters in the absence of pre-existing maternal centrosomes. The asters, which develop near the innermost pole of the meiotic apparatus, interact with the female chromatin to form the first mitotic spindle. The appearance of microtubule-based asters in the cytoplasm of the activated Folsomia oocyte might represent a conserved mechanism for centrosome formation during insect parthenogenesis. We also report that the architecture of the female meiotic apparatus and the structure of the mitotic spindles during the early embryonic divisions are unusual in comparison with that of insects.
Maria Giovanna Riparbelli; Rosanna Giordano; Giuliano Callaini
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-08-12
Journal Detail:
Title:  Cell and tissue research     Volume:  326     ISSN:  0302-766X     ISO Abbreviation:  Cell Tissue Res.     Publication Date:  2006 Dec 
Date Detail:
Created Date:  2006-11-22     Completed Date:  2007-08-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0417625     Medline TA:  Cell Tissue Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  861-72     Citation Subset:  IM    
Department of Evolutionary Biology, University of Siena, Via A. Moro 2, 53100 Siena, Italy.
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MeSH Terms
Arthropods / embryology,  genetics*
Centrosome / physiology*
Embryo, Nonmammalian
Extrachromosomal Inheritance*
Oocytes / cytology,  physiology,  ultrastructure
Ovum / cytology,  physiology*,  ultrastructure
Parthenogenesis / physiology*
Propidium / metabolism
Reg. No./Substance:

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