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Regular Article |
a Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854-8082
The murine autosomal deleted in azoospermia-like protein (mDAZL) is a germ cell-restricted RNA-binding protein essential for sperm production. Homozygous disruption of the mDAZL gene results in the absence of germ cells beyond the spermatogonial stage. Progress into the function of DAZL in spermatogenesis has been hampered without identification of the cognate mRNA substrates that it binds to and regulates. Using the isolation of specific nucleic acids associated with proteins (SNAAP) technique recently developed in our lab, we identified mRNAs from testis that were specifically bound by mDAZL. One mRNA encoded the Tpx-1 protein, a testicular cell adhesion protein essential for the progression of spermatogenesis. A 26-nucleotide region necessary and sufficient to bind mDAZL was found within additional mRNAs isolated by the screen. These included mRNA encoding Pam, a protein associated with myc; GRSF1, an mRNA-binding protein involved in translation activation, and TRF2, a TATA box-binding protein-like protein involved in transcriptional regulation. Each mRNA containing the mDAZL binding site was specifically bound by mDAZL. A similar sequence is also present in the Cdc25A mRNA, a threonine/tyrosine phosphatase involved in cell cycle progression. The mDAZL and Cdc25A homologues are functionally linked in Drosophila and are necessary for spermatogenesis. Our demonstration that Tpx-1 and Cdc25A mRNAs are bound by mDAZL suggests that mDAZL regulates a subset of mRNAs necessary for germ cell development and cell cycle progression. Understanding how mDAZL regulates the target mRNAs will provide new insights into spermatogenesis, strategies for therapeutic intervention in azoospermic patients, and novel approaches for male contraception.
1 Supported by the Johnson and Johnson Discovery Award and NIH grant HD39744 to M.K.
2 Correspondence: Megerditch Kiledjian, Department of Cell Biology and Neuroscience, Rutgers University, 604 Allison Rd., Piscataway, NJ 08854-8082. FAX: 732 445 0104; kiledjia{at}biology.rutgers.edu
3 Current address: PTC Therapeutics, South Plainfield, NJ 07080.
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