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West Jerusalem, Israel

Kanarek N.,Lautenberg Center for Immunology | Horwitz E.,Lautenberg Center for Immunology | Mayan I.,Lautenberg Center for Immunology | Leshets M.,Lautenberg Center for Immunology | And 8 more authors.
Genes and Development | Year: 2010

β-TrCP, the substrate recognition subunit of a Skp1-Cul1-F-box (SCF) ubiquitin ligase, is ubiquitously expressed from two distinct paralogs, targeting many regulatory proteins for proteasomal degradation. We generated inducible β-TrCP hypomorphic mice and found that they are surprisingly healthy, yet have a severe testicular defect. We show that the two β-TrCP paralogs have a nonredundant role in spermatogenesis. The testicular defect is tightly associated with cell adhesion failure within the seminiferous tubules and is fully reversible upon β-TrCP restoration. Remarkably, testicular depletion of a single β-TrCP substrate, Snail1, rescued the adhesion defect and restored spermatogenesis. Our studies highlight an unexpected functional reserve of this central E3, as well as a bottleneck in a specific tissue: a single substrate whose stabilization is incompatible with testicular differentiation. © 2010 by Cold Spring Harbor Laboratory Press.

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