The rise and fall of the ancient northern pike master sex-determining gene

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Identifiant documentaire 25-3253185
Identifiant OAI 3253185
Auteur(s): Pan Qiaowei,Feron Romain,Jouanno Elodie,Darras Hugo,Herpin Amaury,Koop Ben,Rondeau Eric,Goetz Frederick W,Larson Wesley A,Bernatchez Louis,Tringali Mike,Curran Stephen S,Saillant Eric,Denys Gael Pj,von Hippel Frank A,Chen Songlin,López J Andrés,Verreycken Hugo,Ocalewicz Konrad,Guyomard René,Eche Camille,Lluch Jerome,Roques Celine,Hu Hongxia,Tabor Roger,Dehaan Patrick,Nichols Krista,Journot Laurent,Parrinello Hugues,Klopp Christophe,Interesova Elena A,Trifonov Vladimir,Schartl Manfred,Postlethwait John,Guiguen Yann
Mots clés Esociforms Evolutionary biology Fish Master sex determining gene Mudminnows Pikes Sex determination Umbridae Esocidae
Date de publication 28/01/2021
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The understanding of the evolution of variable sex determination mechanisms across taxa requires comparative studies among closely related species. Following the fate of a known master sex-determining gene, we traced the evolution of sex determination in an entire teleost order (Esociformes). We discovered that the northern pike (Esox lucius) master sex-determining gene originated from a 65 to 90 million-year-old gene duplication event and that it remained sex linked on undifferentiated sex chromosomes for at least 56 million years in multiple species. We identified several independent species- or population-specific sex determination transitions, including a recent loss of a Y chromosome. These findings highlight the diversity of evolutionary fates of master sex-determining genes and the importance of population demographic history in sex determination studies. We hypothesize that occasional sex reversals and genetic bottlenecks provide a non-adaptive explanation for sex determination transitions.
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