Brandt, Alexander VerfasserIn aut Lavanchy, Guillaume VerfasserIn aut Mérel, Vincent VerfasserIn aut Soldini, Luca VerfasserIn aut Massy, Morgane VerfasserIn aut Dumas, Zoé VerfasserIn aut Gaudichau, Emelyne VerfasserIn aut Labédan, Marjorie VerfasserIn aut Pasquier Genoud, Falon VerfasserIn aut Bastardot, Marc VerfasserIn aut Schwander, Tanja VerfasserIn aut text Text xx 2026 monographic [accepted author manuscript] Rostock University of Rostock publisher 2026 Rostock Universitätsbibliothek distributor eng

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Many organisms reproduce through non-canonical modes such as parthenogenesis or hybridogenesis (clonal transmission of one parent’s chromosomes), but whether these arise abruptly or stepwise from each other remains unclear. We address this in the stick-insect genus Bacillus , which harbors several hybrid lineages with diverse reproductive modes. From haplotype-resolved phylogenies of >500 wild-caught individuals, we infer a single, recent (~8,000 years) origin of all hybrids. The ancestral hybrid reproduced via hybridogenesis, which subsequently diversified into parthenogenesis and, twice independently, into triploid lineages. Laboratory crosses recapitulate this trajectory, where each step facilitated the next. These findings reveal how a single genomic perturbation can act as a catalyst for evolutionary innovation, turning the loss of sex into a driver of diversification rather than a dead end.<eng> Alexander Brandt, Guillaume Lavanchy, Vincent Mérel, Luca Soldini, Morgane Massy, Zoé Dumas, Emelyne Gaudichau, Marjorie Labédan, Falon Pasquier Genoud, Marc Bastardot, Tanja Schwander 570 https://purl.uni-rostock.de/rosdok/id00005578 2026 1091-6490 Vol. 123, No. 22, e2535700123 Verlags-Ausgabe doi.org/10.1073/pnas.2535700123 urn:nbn:de:gbv:28-rosdok_id00005578-1 10.18453/rosdok_id00005578 1593910836 rda DE-627 260605 197254747X 20260605T161936.0 Converted from MARCXML to MODS version 3.8 using MARC21slim2MODS3-8_XSLT1-0.xsl (Revision 1.174 20250328) ger