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X-linked sex-reversing genes

¹Department of Obstetrics and Gynecology, University of Tennessee, Memphis 38103, USA. swachtel@utmem1.utmem.edu

Cytogenetics and Cell Genetics

|July 25, 1998

Summary

A novel gene duplication on the X chromosome (Xp21) in humans causes XY sex reversal by blocking testis development. This finding may relate to similar sex-determining genes in other mammals.

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Area of Science:

Genetics
Developmental Biology
Mammalian Sex Determination

Background:

The X chromosome plays a crucial role in mammalian sex determination.
XY sex reversal, where individuals with XY chromosomes develop female characteristics, can occur due to genetic factors.
Ohno's Law suggests conserved sex-determining genes across eutherian mammals.

Purpose of the Study:

To identify and map a novel gene responsible for sex reversal in humans with XY karyotypes.
To investigate the mechanism by which this gene affects testis development.

Main Methods:

Genetic analysis of individuals with XY sex reversal.
Gene mapping to identify the location of the causative gene.
Functional studies to understand the gene's role in gonadal development.

Main Results:

A duplication in the Xp21 region of the X chromosome was identified in some human XY females.
This duplication involves a novel sex-reversing gene.
Overexpression (double dosage) of this gene inhibits testis development.

Conclusions:

A duplication in Xp21 is associated with XY sex reversal in humans.
This gene represents a key factor in preventing male gonad development.
Further research is needed to determine if this gene is homologous to the sex-reversal gene in wood lemmings.

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