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Article Dans Une Revue Evolution - International Journal of Organic Evolution Année : 2014

XY female do better than the XX in the african pygmy mouse, mus minutoides

Résumé

All therian mammals have a similar XY/XX sex-determination system except for a dozen species. The African pygmy mouse, Mus minutoides, harbors an unconventional system in which all males are XY, and there are three types of females: the usual XX but also XX * and X * Y ones (the asterisk designates a sex-reversal mutation on the X chromosome). The long-term evolution of such a system is a paradox, because X * Y females are expected to face high reproductive costs (e.g., meiotic disruption and loss of unviable YY embryos), which should prevent invasion and maintenance of a sex-reversal mutation. Hence, mechanisms for compensating for the costs could have evolved in M. minutoides. Data gathered from our laboratory colony revealed that X * Y females do compensate and even show enhanced reproductive performance in comparison to the XX and XX * ; they produce significantly more offspring due to (i) a higher probability of breeding, (ii) an earlier first litter, and (iii) a larger litter size, linked to (iv) a greater ovulation rate. These findings confirm that rare conditions are needed for an atypical sex-determination mechanism to evolve in mammals, and provide valuable insight into understanding modifications of systems with highly heteromorphic sex chromosomes.

Dates et versions

hal-03031700 , version 1 (16-12-2020)

Identifiants

Citer

Paul A Saunders, Julie Perez, Massilva Rahmoun, Ophélie Ronce, Pierre-André Crochet, et al.. XY female do better than the XX in the african pygmy mouse, mus minutoides. Evolution - International Journal of Organic Evolution, 2014, 68 (7), pp.2119-2127. ⟨10.1111/evo.12387⟩. ⟨hal-03031700⟩
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