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MEIG1 is essential for spermiogenesis in mice.

http://www.ncbi.nlm.nih.gov/pubmed/19805151

Spermatogenesis can be divided into three stages: spermatogonial mitosis, meiosis of spermatocytes, and spermiogenesis. During spermiogenesis, spermatids undergo dramatic morphological changes including formation of a flagellum and chromosomal packaging and condensation of the nucleus into the sperm head. The genes regulating the latter processes are largely unknown. We previously discovered that a bi-functional gene, Spag16, is essential for spermatogenesis. SPAG16S, the 35 kDa, testis-specific isoform derived from the Spag16 gene, was found to bind to meiosis expressed gene 1 product (MEIG1), a protein originally thought to play a role in meiosis. We inactivated the Meig1 gene and, unexpectedly, found that Meig1 mutant male mice had no obvious defect in meiosis, but were sterile as a result of impaired spermatogenesis at the stage of elongation and condensation. Transmission electron microscopy revealed that the manchette, a microtubular organelle essential for sperm head and flagellar formation was disrupted in spermatids of MEIG1-deficient mice. We also found that MEIG1 associates with the Parkin co-regulated gene (PACRG) protein, and that testicular PACRG protein is reduced in MEIG1-deficient mice. PACRG is thought to play a key role in assembly of the axonemes/flagella and the reproductive phenotype of Pacrg-deficient mice mirrors that of the Meig1 mutant mice. Our findings reveal a critical role for the MEIG1/PARCG partnership in manchette structure and function and the control of spermiogenesis.

Pubmed ID: 19805151 RIS Download

Mesh terms: Amino Acid Sequence | Animals | Blotting, Western | COS Cells | Cell Cycle Proteins | Cercopithecus aethiops | Genes, Essential | Green Fluorescent Proteins | Immunoprecipitation | Male | Mice | Mice, Knockout | Microscopy, Electron | Molecular Sequence Data | Nuclear Proteins | Phosphoproteins | Protein Transport | Proteins | Reverse Transcriptase Polymerase Chain Reaction | Sequence Homology, Amino Acid | Spermatids | Spermatogenesis | Testis | Two-Hybrid System Techniques

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Associated grants

  • Agency: NICHD NIH HHS, Id: 1F31HD0G2314-01
  • Agency: NINDS NIH HHS, Id: 5P30NS047463
  • Agency: NCI NIH HHS, Id: CA115503
  • Agency: NICHD NIH HHS, Id: HD 045783
  • Agency: NICHD NIH HHS, Id: HD37416
  • Agency: Intramural NIH HHS, Id:

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