Karel Janko

The paper investigates the origin of asexuality in the Amazon molly, showing that ancestral introgression between parental species contributed to its unique genomic makeup.

The paper shows that hexaploid Carassius gibelio females use achiasmatic meiosis to produce clonal eggs, while males have reduced fertility due to meiotic issues, and B chromosomes are stably inherited as univalents.

The paper presents complete GRC assemblies from passerine birds, revealing their composition, evolution, and dynamic nature despite their stability in the avian karyotype.

The paper examines sex-specific gametogenesis in natural and lab-bred Fundulus hybrids, finding that females can produce diploid and tetraploid oocytes with clonal reproduction, while males show meiotic failure and sterility.

This study investigates the mechanisms and timing of programmed DNA elimination in songbirds, identifying key cellular and epigenetic processes involved in the removal of the germline-restricted chromosome from somatic cells.

The paper presents chromosome-level genome assemblies for three hybridizing Cobitis species to study hybrid sterility and asexuality, revealing structural variation and sex chromosome divergence.

The paper shows asexual hybrids mediate genomic introgression from an extinct species into their sexual parent, challenging the view of asexual lineages as evolutionary dead ends.

The paper investigates the triggers of clonal gametogenesis in hybrids, finding that it is initiated by intrinsic signals in hybrid germ cells but requires a female gonadal environment for execution.

The paper investigates genome duplication in gynogenetic hybrids of Cobitis taenia, finding that endoreplication occurs in a minority of gonocytes and is more common in natural clones than experimental hybrids.

The paper shows hybrid asexuality can act as a primary reproductive barrier in speciation, emerging before other postzygotic incompatibilities in Cobitis loaches and other fish species.