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Pregametogenesis: The Earliest Stages of Gonad and Germline Differentiation in Anuran Amphibians.
Biology (Basel)
December 2024
Amphibian Biology Group, Department of Evolutionary Biology and Conservation of Vertebrates, Faculty of Biological Sciences, University of Wrocław, Sienkiewicza 21, 50-335 Wrocław, Poland.
The gonads of amphibians, like other vertebrates, consist of somatic tissues, which create a specific environment essential for the differentiation of germline cells. The earliest stages of gametogenesis still remain underexplored in anuran amphibians. We propose to introduce the term "pregametogenesis" for a specific period of gonocyte proliferation and differentiation that occurs exclusively during the early stages of gonadal development.
View Article and Find Full Text PDFGradual chromosomal lagging drive programmed genome elimination in hemiclonal fishes from the genus Hypseleotris.
Sci Rep
November 2024
Centre for Applied Water Science, Institute for Applied Ecology, Faculty of Science and Technology, University of Canberra, Canberra, ACT, Australia.
Most eukaryotes maintain the stability of their cellular genome sizes to ensure genome transmission to offspring through sexual reproduction. However, some alter their genome size by selectively eliminating parts or increasing ploidy at specific developmental stages. This phenomenon of genome elimination or whole genome duplication occurs in animal hybrids reproducing asexually.
View Article and Find Full Text PDFInheritance patterns of male asexuality in hybrid males of a water frog Pelophylax esculentus.
Sci Rep
September 2024
Department of Biology and Ecology, Faculty of Science, University of Ostrava, Chittussiho 10, Ostrava, 710 00, Czech Republic.
Gametogenesis produces gametes as a piece of genetic information transmitted to the offspring. While during sexual reproduction, progeny inherits a mix of genetic material from both parents, asexually reproducing organisms transfer a copy of maternal or paternal DNA to the progeny clonally. Parthenogenetic, gynogenetic and hybridogenetic animals have developed various mechanisms of gametogenesis, however, their inheritance is not fully understood.
View Article and Find Full Text PDFA robust system of hybridogenesis that increases genetic variability and promotes evolutionary succession in greenlings (Teleostei: Hexagrammidae, genus Hexagrammos): Regeneration of a new hemiclonal lineage.
PLoS One
June 2024
Usujiri Fisheries Station, Field Science Center for Northern Biosphere, Hokkaido University, Hakodate, Japan.
Unisexual hybrids that reproduce either clonally or hemiclonally are considered to be evolutionarily short-lived as they lack the ability to reduce deleterious mutations and increase genetic diversity. In the greenling (Teleostei: Hexagrammidae, genus Hexagrammos), unisexual hybrids that produce haploid eggs containing only the H. octogrammus (maternal species) genome generate hemiclonal offspring by fertilization with haploid sperm of H.
View Article and Find Full Text PDFEvolution of alternative reproductive systems in Bacillus stick insects.
Evolution
May 2024
Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland.
Reproduction is a key feature of all organisms, yet the way in which it is achieved varies greatly across the tree of life. One striking example of this variation is the stick insect genus Bacillus, in which five different reproductive modes have been described: sex, facultative and obligate parthenogenesis, and two highly unusual reproductive modes: hybridogenesis and androgenesis. Under hybridogenesis, the entire genome from the paternal species is eliminated and replaced each generation by mating with the corresponding species.
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