[PDF][PDF] RPL10L is required for male meiotic division by compensating for RPL10 during meiotic sex chromosome inactivation in mice

L Jiang, T Li, X Zhang, B Zhang, C Yu, Y Li, S Fan… - Current Biology, 2017 - cell.com
L Jiang, T Li, X Zhang, B Zhang, C Yu, Y Li, S Fan, X Jiang, T Khan, Q Hao, P Xu, D Nadano…
Current Biology, 2017cell.com
The mammalian sex chromosomes have undergone profound changes during their
evolution from an ancestral pair of autosomes [1–4]. Specifically, the X chromosome has
acquired a paradoxical sex-biased function by redistributing gene contents [5, 6] and has
generated a disproportionately high number of retrogenes that are located on autosomes
and exhibit male-biased expression patterns [6]. Several selection-based models have been
proposed to explain this phenomenon, including a model of sexual antagonism driving X …
Summary
The mammalian sex chromosomes have undergone profound changes during their evolution from an ancestral pair of autosomes [1–4]. Specifically, the X chromosome has acquired a paradoxical sex-biased function by redistributing gene contents [5, 6] and has generated a disproportionately high number of retrogenes that are located on autosomes and exhibit male-biased expression patterns [6]. Several selection-based models have been proposed to explain this phenomenon, including a model of sexual antagonism driving X inactivation (SAXI) [6–8] and a compensatory mechanism based on meiotic sex chromosome inactivation (MSCI) [6, 8–11]. However, experimental evidence correlating the function of X-chromosome-derived autosomal retrogenes with evolutionary forces remains limited [12–17]. Here, we show that the deficiency of Rpl10l, a murine autosomal retrogene of Rpl10 with testis-specific expression, disturbs ribosome biogenesis in late-prophase spermatocytes and prohibits the transition from prophase into metaphase of the first meiotic division, resulting in male infertility. Rpl10l expression compensates for the lack of Rpl10, which exhibits a broad expression pattern but is subject to MSCI during spermatogenesis. Importantly, ectopic expression of RPL10L prevents the death of cultured RPL10-deficient somatic cells, and Rpl10l-promoter-driven transgenic expression of Rpl10 in spermatocytes restores spermatogenesis and fertility in Rpl10l-deficient mice. Our results demonstrate that Rpl10l plays an essential role during the meiotic stage of spermatogenesis by compensating for MSCI-mediated transcriptional silencing of Rpl10. These data provide direct evidence for the compensatory hypothesis and add novel insight into the evolution of X-chromosome-derived autosomal retrogenes and their role in male fertility.
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