1. The rise and fall of the ancient northern pike master sex-determining gene.
- Author
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Pan Q, Feron R, Jouanno E, Darras H, Herpin A, Koop B, Rondeau E, Goetz FW, Larson WA, Bernatchez L, Tringali M, Curran SS, Saillant E, Denys GP, von Hippel FA, Chen S, López JA, Verreycken H, Ocalewicz K, Guyomard R, Eche C, Lluch J, Roques C, Hu H, Tabor R, DeHaan P, Nichols KM, Journot L, Parrinello H, Klopp C, Interesova EA, Trifonov V, Schartl M, Postlethwait J, and Guiguen Y
- Subjects
- Animals, Female, Male, Phylogeny, Esocidae genetics, Gene Duplication, Sex Chromosomes genetics, Sex Determination Processes physiology
- Abstract
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., Competing Interests: QP, RF, EJ, HD, AH, BK, ER, FG, WL, LB, MT, SC, ES, GD, Fv, SC, JL, HV, KO, RG, CE, JL, CR, HH, RT, PD, KN, LJ, HP, CK, EI, VT, MS, JP, YG No competing interests declared, (© 2021, Pan et al.)
- Published
- 2021
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