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The human adrenal cortex comprises three distinct zones with unique steroid products, namely the zona glomerulosa, which secretes the mineralocorticoids, the zona fasciculate, which secretes the glucocorticoids and the zona reticularis (ZR), which at adrenarche, begins to produce the so-called adrenal androgens. Of all the adrenal zones, we still understand control of ZR emergence the least, and yet the consequences of such dysregulation can be devastating. Premature adrenarche is a growing problem and the correspondingly inappropriate emergence of ZR function can negatively influence puberty and lead to adult infertility. Our understanding is limited and more needs to be done. The purpose of these three reviews is to provide a survey of where we are in our current understanding of what adrenarche is, and indeed if it is unique to humans at all. Furthermore, these reviews describe what is also known of how the functional ZR emerges during adrenarche and what steroids of physiologic relevance result beyond the widely known DHEA and DHEAS elevated at this time. Such advances in human, primate and indeed stem-cell biology are clearly laying the foundation for new directions in the hunt for the factors involved in the regulation and functional emergence of a ZR at the appropriate time, as well as insight into how they may fail. Given support for these new directions, considerable progress can clearly be made.

In the zone: understanding zona reticularis function and its transformation by adrenarche