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Unexpected Oogenic Pathways for the Triploid Fish Chrosomus eos-neogaeus.
Joëlle Lafond1, Philippe Hénault1, Christelle Leung1
1Department of Biological Sciences, Université de Montréal, Montreal, Quebec, Canada.
The Journal of Heredity
|January 1, 2019
Summary
Triploid fish can reproduce asexually through two distinct methods: meiotic and ameiotic hybridogenesis. This study reveals that these reproductive pathways, crucial for triploid persistence, occur exclusively, impacting population dynamics in the Chrosomus eos-neogaeus complex.
Area of Science:
- * Evolutionary Biology
- * Reproductive Biology
- * Genetics
Background:
- * Triploid vertebrates often rely on asexual reproduction for perpetuation.
- * In the Chrosomus eos×eos-neogaeus complex, triploids are produced by diploid hybrids but their perpetuation was unexpected.
- * Previous understanding suggested C. eos as the sole progeny, limiting expected triploid persistence.
Purpose of the Study:
- * To investigate the oogenesis of triploid hybrids in the Chrosomus eos×eos-neogaeus complex.
- * To determine the reproductive mechanisms enabling triploid perpetuation.
- * To analyze the genetic characterization of offspring from experimental crosses.
Main Methods:
- * Experimental crosses involving 12 female triploids and 3 mosaic (2n/3n) individuals.
- * Fertilization of eggs with Chrosomus eos sperm.
- * Genetic characterization of 337 resulting larvae.
Main Results:
- * Detection of C. eos progeny confirmed meiotic hybridogenesis in half of the triploids.
- * Presence of tetraploid offspring indicated unreduced triploid eggs, suggesting failed meiotic hybridogenesis.
- * Diploid and triploid hybrids were produced by remaining triploids and mosaics via ameiotic hybridogenesis, excluding paternal genome.
Conclusions:
- * Two mutually exclusive hybridogenesis pathways (meiotic and ameiotic) were identified in triploid fish.
- * The findings suggest potential long-term persistence of triploid hybrids or a generational reproductive strategy.
- * Population dynamics of the Chrosomus eos-neogaeus complex are more intricate than previously assumed.
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