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PLoS Genet 2009 Sep 01;59:e1000635. doi: 10.1371/journal.pgen.1000635.
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GASZ is essential for male meiosis and suppression of retrotransposon expression in the male germline.

Ma L , Buchold GM , Greenbaum MP , Roy A , Burns KH , Zhu H , Han DY , Harris RA , Coarfa C , Gunaratne PH , Yan W , Matzuk MM .

Nuage are amorphous ultrastructural granules in the cytoplasm of male germ cells as divergent as Drosophila, Xenopus, and Homo sapiens. Most nuage are cytoplasmic ribonucleoprotein structures implicated in diverse RNA metabolism including the regulation of PIWI-interacting RNA (piRNA) synthesis by the PIWI family (i.e., MILI, MIWI2, and MIWI). MILI is prominent in embryonic and early post-natal germ cells in nuage also called germinal granules that are often associated with mitochondria and called intermitochondrial cement. We find that GASZ (Germ cell protein with Ankyrin repeats, Sterile alpha motif, and leucine Zipper) co-localizes with MILI in intermitochondrial cement. Knockout of Gasz in mice results in a dramatic downregulation of MILI, and phenocopies the zygotene-pachytene spermatocyte block and male sterility defect observed in MILI null mice. In Gasz null testes, we observe increased hypomethylation and expression of retrotransposons similar to MILI null testes. We also find global shifts in the small RNAome, including down-regulation of repeat-associated, known, and novel piRNAs. These studies provide the first evidence for an essential structural role for GASZ in male fertility and epigenetic and post-transcriptional silencing of retrotransposons by stabilizing MILI in nuage.

PubMed ID: 19730684
PMC ID: PMC2727916
Article link: PLoS Genet
Grant support: [+]

Species referenced: Xenopus
Genes referenced: actl6a ank1 asz1 kidins220 lamtor2 mael mmut piwil1 piwil2 piwil4 ranbp9 slc7a5 tdrd1 tdrd6 tdrd7

Article Images: [+] show captions
References [+] :
Aravin, A piRNA pathway primed by individual transposons is linked to de novo DNA methylation in mice. 2008, Pubmed