Publications by authors named "K Janko"
Article Synopsis
- - Hybridization and polyploidy drive significant evolutionary changes in organisms, affecting gene expression and leading to various phenotypic outcomes.
- - The researchers created a thermodynamic model to differentiate the impacts of hybridization from polyploidy on gene expression, using transcription factor and promoter interactions as a basis for their analysis.
- - Findings suggest that the expression patterns in hybrids and polyploids arise more from the interaction of existing divergent regulatory systems than from new adaptive changes, opening up new avenues for research into gene regulation mechanisms.
Article Synopsis
- - Reproductive isolation and hybrid sterility prevent genetic mixing between species, but hybridization of bighead and North African catfish in Thailand shows complex evolution, including the formation of all-female lineages that can reproduce clonally.
- - The study analyzed meiosis in female hybrids, revealing over 95% exhibited chromosome asynapsis yet could produce mature eggs, indicating a unique path to reproductive success.
- - Findings suggest that the ability of female hybrid catfish to reproduce clonally may offer insights into the effects of hybridization and mechanisms of asexual reproduction, drawing parallels with known clonal species in the animal kingdom.
Article Synopsis
- The study examines how hybridization affects reproductive mechanisms in fish, specifically focusing on the Cobitidae family.
- Hybrids display varying ploidy levels (diploid and triploid) that impact gamete development, with diploid hybrids producing normal diploid gametes while triploid hybrids struggle with abnormal chromosome pairing leading to sterility.
- The findings suggest that changes in ploidy and genome ratios can significantly alter reproductive pathways, influencing whether hybrids reproduce sexually or asexually.
Asexual reproduction can be triggered by interspecific hybridization, but its emergence is supposedly rare, relying on exceptional combinations of suitable genomes. To examine how genomic and karyotype divergence between parental lineages affect the incidence of asexual gametogenesis, we experimentally hybridized fishes (Cobitidae) across a broad phylogenetic spectrum, assessed by whole exome data. Gametogenic pathways generally followed a continuum from sexual reproduction in hybrids between closely related evolutionary lineages to sterile or inviable crosses between distant lineages.
View Article and Find Full Text PDFSexual reproduction is the primary mode of reproduction in eukaryotes, but some organisms have evolved deviations from classical sex and switched to asexuality. These asexual lineages have sometimes been viewed as evolutionary dead ends, but recent research has revealed their importance in many areas of general biology. Our review explores the understudied, yet important mechanisms by which sperm-dependent asexuals that produce non-recombined gametes but rely on their fertilization, can have a significant impact on the evolution of coexisting sexual species and ecosystems.
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