Sexual differentiation

Research output: Contribution to journalReview article

40 Scopus citations

Abstract

Sexual differentiation in humans is genetically and hormonally controlled. In response to a signal from a dominant acting gene on the Y chromosome, primordial cells in the embryonic gonad ridge differentiate into Sertoli cells and affect newly migrated germ cells to differentiate as spermatogonia, thus creating a testis. The cells of the embryonic testis secrete hormones that lead to the development of most, if not all, male secondary sexual characteristics. The Sertoli cells secrete müllerian inhibitory factor (MIF), causing regression of the müllerian ducts and of stray oogonia. The Leydig cells secrete testosterone, causing differentiation and growth of the wolffian duct structures. Dihydrotestosterone, created by metabolism of testosterone, causes growth of the prostate and phallus and fusion of the labioscrotal folds. In the absence of SRY, Sertoli cell differentiation does not occur. Rather germ cells migrating into the primordial gonad differentiate as oogonia and cause interstitial cells to differentiate as granulosa cells. In the absence of MIF and testosterone, the müllerian ducts differentiate and grow as female internal genitalia and the external genitalia are feminized. Several genes have been identified that control testis determination. These include SRY, WT1, SOX9, SF1, XH2, and DAX1. Most of these genes were discovered by analysis of rare cases of sex reversal (genetic sex of one type, gonadal sex of the other type).

Original languageEnglish (US)
Pages (from-to)41-49
Number of pages9
JournalSeminars in Reproductive Medicine
Volume18
Issue number1
DOIs
StatePublished - 2000
Externally publishedYes

Keywords

  • Gonadal differentiation
  • Gonadal dysgenesis
  • Hermaphroditism
  • Intersex conditions
  • Sex determination

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Reproductive Medicine
  • Endocrinology
  • Obstetrics and Gynecology
  • Physiology (medical)

Fingerprint Dive into the research topics of 'Sexual differentiation'. Together they form a unique fingerprint.

  • Cite this