The human and mouse sex-determining SRY genes repress the Rspol/β-catenin signaling

Yun-Fai Chris Lau^,,
Yunmin Li

Division of Cell and Developmental Genetics, Department of Medicine, VA Medical Center, University of California, San Francisco, CA 94121, USA

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Corresponding author: E-mail address: chris.lau@ucsf.edu (Yun-Fai Chris Lau)

摘要

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Abstract: The sex-determining region Y (SRY) is the gene on the Y chromosome responsible for switching on male sex determination during mammalian embryogenesis. In its absence, ovaries develop in the embryo. Hence, ovarian determination and differentiation is considered to be a default, or passive, developmental pathway. Recently this classical paradigm of sex determination has been challenged with the discovery of the R-spondin 1 (RSPO1) as an active ovarian determinant. Mutations of RSPO1 cause a female-to-male sex reversal. RSPO1 synergizes with WNT4 in activating an ovarian development in the bipotential gonad via the canonical Wnt signaling. Early studies showed that SRY represses such Wnt signaling, but also generated discrepancies on whether only mouse Sry is capable of inhibiting such Wnt signaling and whether both human and mouse SRY proteins are able to interact with β-catenin, the intracellular messenger responsible for executing the Wnt signals. Our studies show that both human SRY and mouse Sry are capable of repressing the Rspo1/Wnt/β-catenin signaling. However, the repression activities vary among different SRY/Sry proteins and paradoxically related to the presence and/or size of an acidic/glutamine-rich domain. The HMG box of human SRY could bind directly to β-catenin while the mouse Sry binds to β-catenin via its HMG box and glutamine-rich domain. The results clarify some of the initial discrepancies, and raise the possibility that SRY interacts with β-catenin in the nucleus and represses the transcriptional activation of the Rspo1/Wnt target genes involved in ovarian determination, thereby switching on testis determination.
- sex determination /
- R-spondin 1 /
- canonical Wnt signaling /
- β-catenin /
- protein interaction

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