Abstract
Sex Determination Sex determination is regulated by the Sox9 gene. During testis differentiation, this gene is directly targeted by the product of the Y chromosome–encoded gene Sry . The regulatory region of Sox9 is complex, which is typical of genes with multiple roles in development. Gonen et al. find that a single far-upstream 557–base pair element is critical for up-regulating Sox9 . Without it, XY mice develop as females instead of males. The 557–base pair enhancer is conserved, likely to be relevant to human disorders of sex differentiation, and probably essential because it acts early in a time-critical process, and any failure allows ovary-specific factors to dominate. Science , this issue p. [1469][1] [1]: /lookup/doi/10.1126/science.aas9408
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