Regulation of Sex-biased Gene Expression by the Ancestral X-Y Chromosomal Gene Pair Kdm5c-Kdm5d
Malcore, R. M.; Samanta, M. K.; Kalantry, S.; Iwase, S.
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Conventionally, Y-linked Sry is thought to drive sex differences by triggering differential hormone production. Ancestral X-Y gene pairs, however, are hypothesized to drive hormone-independent sex differences. Here, we show that the X-Y gene pair Kdm5c-Kdm5d regulates sex-biased gene expression in pluripotent mouse embryonic stem cells (ESCs). Wild-type (WT) XX female ESCs exhibit >2-fold higher expression of 409 genes relative to WT XY male ESCs. Conversely, WT XY male ESCs exhibit >2-fold higher expression of 126 genes compared to WT XX female ESCs. Loss of Kdm5c in female ESCs downregulates female-biased genes. In contrast, loss of either Kdm5c or Kdm5d in male ESCs upregulates female-biased genes and downregulates male-biased genes, effectively neutralizing sex-biased gene expression. KDM5C promotes the expression of Kdm5d and several other Y-linked genes in male ESCs. Moreover, ectopic Kdm5d expression in female ESCs is sufficient to drive male-biased gene expression. These results establish Kdm5c-Kdm5d as critical regulators of sex-biased gene expression.
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