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- W2128600945 endingPage "3068" @default.
- W2128600945 startingPage "3054" @default.
- W2128600945 abstract "The classical paradigm of human and mammalian sexual development, largely based on work of Alfred Jost, depicts the genetic factor(s) that determine(s) sex as influencing only the fate of the gonad. A maleness factor produces testes (Primary Sex Determination). These organs secrete hormones which cause male Secondary Sexual Differentiation. In absence of the maleness factor, by default the gonad becomes an ovary, and the absence of testicular hormones leads to female secondary differentiation. In this article a new paradigm is proposed, to accommodate recent findings. Sexual dimorphism precedes gonadal development, in a Pregonadal Stage. Furthermore, female development is not by default-both male (Y) and female (X) sex-chromosomal primary sex-determining mechanisms probably exist. The human/mammalian male Y-chromosomal sex-determining gene is now known (SRY/Sry), and a candidate for a non-inactivated, X-linked, female determining factor, is under study. However, the proximate gonad-determining genes are probably on autosomes. Pathways between the primary factors and the proximate gonad-determining genes are indirect and complex. A hypothetical gene Z has been proposed, that inhibits the testis determiner and is itself the target of suppression by SRY/Sry. Candidates for proximate testis and ovary-determining factors and for Z also exist. The default concept has also been superseded with respect to secondary sexual differentiation. Absence of testicular hormones does not produce a normal female phenotype; ovarian genes and hormones are necessary. Finally, sex-chromosomal sex-determining genes influence the development not only of non-gonadal organs of secondary sexual development, but also of organs outside of the reproductive system." @default.
- W2128600945 created "2016-06-24" @default.
- W2128600945 creator A5004919410 @default.
- W2128600945 creator A5038080858 @default.
- W2128600945 date "2007-11-28" @default.
- W2128600945 modified "2023-10-12" @default.
- W2128600945 title "Genetics of sexual development: A new paradigm" @default.
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