Document Detail

Unusual triploid males in a microchromosome-carrying clone of the Amazon molly, Poecilia formosa.
MedLine Citation:
PMID:  11173848     Owner:  NLM     Status:  MEDLINE    
The Amazon molly, Poecilia formosa, is an all-female fish of hybrid origin which reproduces by gynogenesis, i.e. it depends on sperm of males of closely related species to trigger parthenogenetic development of the embryo. Therefore the offspring is clonal and identical to the mother. In rare cases the exclusion mechanism fails and paternal introgression occurs. This may result either in triploid offspring - if the whole haploid chromosome set of the sperm fuses with the diploid egg nucleus - or in siblings with microchromosomes - if only subgenomic amounts of paternal DNA are included. In one of our diploid, microchromosome-carrying laboratory stocks we observed eight triploid individuals which all developed into males. We investigated the mitotic and meiotic chromosomes, the synaptonemal complex (SC), and sperm production of these males, and compared them to males of the gonochoristic parental species (P. latipinna and P. mexicana) and their hybrids. This comparison revealed that P. formosa males are functional males with reduced effective fertility. They show a deviation from the typical 23 bivalents in the synaptonemal complexes as well as in diakinesis due to the triploid state. They produced offspring but only with gynogenetic Amazon molly females. This shows that the probably aneuploid sperm from P. formosa males can trigger parthenogenetic development of unreduced eggs.
D K Lamatsch; I Nanda; J T Epplen; M Schmid; M Schartl
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Cytogenetics and cell genetics     Volume:  91     ISSN:  0301-0171     ISO Abbreviation:  Cytogenet. Cell Genet.     Publication Date:  2000  
Date Detail:
Created Date:  2001-02-22     Completed Date:  2001-03-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0367735     Medline TA:  Cytogenet Cell Genet     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  148-56     Citation Subset:  IM    
Copyright Information:
Copyright 2001 S. Karger AG, Basel
Lehrstuhl für Physiologische Chemie I, Theodor-Boveri-Institut, Biozentrum, Würzburg , Germany.
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MeSH Terms
Cloning, Organism
DNA Fingerprinting
Fishes / genetics*
Flow Cytometry
Infertility, Male / genetics
Meiosis / genetics
Microscopy, Electron
Mitosis / genetics
Parthenogenesis / genetics*
Sex Determination (Genetics)*
Spermatozoa / cytology,  metabolism,  ultrastructure
Synaptonemal Complex / genetics,  ultrastructure

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