Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 102, Issue 5, Pages 1513-1518Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0404685102
Keywords
mRNA storage; spermatogenesis; transcription and translation linkage; Y-box protein
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Funding
- NICHD NIH HHS [HD44449, R01 HD044449] Funding Source: Medline
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During spermatogenesis, male germ cells temporally synthesize many proteins as they differentiate through meiosis and become spermatozoa. The germ cell Y-box protein, MSY2, constituting approximate to0.7% of total protein in male germ cells, binds to a consensus promoter element, and shows a general lack of RNA-binding specificity. Combining immunoprecipitation and suppressive subtractive hybridization, we identified populations of germ cell mRNAs that are not bound or bound by MSY2. The former population is enriched in cell growth and ubiquitously expressed mRNAs, whereas the latter population is enriched for stored or translationally delayed, male gamete-specific transcripts. Chromatin precipitation assays reveal that most of the IVISY2 target mRNAS are transcribed from genes containing the Y-box DNA-binding motif in their promoters. In transgenic mice, mRNAs encoding exogenous GFP are directed or not directed into the MSY2-bound fraction by promoters containing or lacking the Y-box motif, respectively. We propose that IVISY2 marks specific mRNAs in the nucleus for cytoplasmic storage, thereby linking transcription and mRNA storage/translational delay in meiotic and postmeiotic male germ cells of the mouse.
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