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标题：Argonautes ALG-3 and ALG-4 are required for spermatogenesis-specific 26G-RNAs and thermotolerant sperm in Caenorhabditis elegans
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作者：Colin C. Conine ; Pedro J. Batista ; Weifeng Gu 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2010
卷号：107
期号：8
页码：3588-3593
DOI：10.1073/pnas.0911685107
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Gametogenesis is a thermosensitive process in numerous metazoans, ranging from worms to man. In Caenorhabditis elegans, a variety of RNA-binding proteins that associate with germ-line nuage (P granules), including the Piwi-clade argonaute PRG-1, have been implicated in maintaining fertility at elevated temperature. Here we describe the role of two AGO-class paralogs, alg-3 (T22B3.2) and alg-4 (ZK757.3), in promoting thermotolerant male fertility. A rescuing GFP::alg-3 transgene is localized to P granules beginning at the late pachytene stage of male gametogenesis. alg-3/4 double mutants lack a subgroup of small RNAs, the 26G-RNAs which target and appear to down-regulate numerous spermatogenesis-expressed mRNAs. These findings add to a growing number of AGO pathways required for thermotolerant fertility in C. elegans and support a model in which AGOs and their small RNA cofactors function to promote robustness in gene-expression networks.
关键词：gene expression ; RNAi ; germline ; P granules ; spermiogenesis