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The Ratio of X Chromosome to Autosomes

The Ratio of X Chromosome to Autosomes

In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
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Related Experiment Video

Updated: May 29, 2026

An Ecdysone Receptor-based Singular Gene Switch for Deliberate Expression of Transgene with Robustness, Reversibility, and Negligible Leakiness

An Ecdysone Receptor-based Singular Gene Switch for Deliberate Expression of Transgene with Robustness, Reversibility, and Negligible Leakiness

Published on: May 7, 2018

Sex determination: switch and suppress.

Amaury Herpin¹, Manfred Schartl

¹University of Würzburg, Physiological Chemistry I, Biozentrum, Am Hubland, D-97074 Würzburg, Germany.

Current Biology : CB

|September 17, 2011

Summary

The transcription factor Dmrt1 is crucial for male sexual development and actively suppresses female traits in testes. This finding reveals that maintaining gonadal fate requires continuous biological effort throughout life.

Area of Science:

Developmental Biology
Genetics
Reproductive Biology

Background:

The transcription factor Dmrt1 (Doublesex and mab-3 related transcription factor 1) plays a conserved role in male sexual development across various species.
Understanding the precise regulatory mechanisms governing gonadal fate decisions is essential for reproductive health.

Purpose of the Study:

To investigate novel functions of Dmrt1 beyond its established role in male development.
To explore the dynamic regulation of gonadal fate and the maintenance of sexual characteristics.

Main Methods:

Utilized genetic models (e.g., flies, worms) to study Dmrt1 function.
Employed molecular and cellular techniques to analyze gene expression and cellular differentiation pathways.

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Main Results:

Dmrt1 actively suppresses female differentiation pathways within the testes.
The maintenance of male gonadal fate is an active process, not a default state.

Conclusions:

Dmrt1 is a key suppressor of female development in male gonads.
Gonadal fate requires continuous active maintenance throughout an organism's lifespan, challenging previous notions of a finalized decision.