期刊
CURRENT BIOLOGY
卷 16, 期 21, 页码 2135-2142出版社
CELL PRESS
DOI: 10.1016/j.cub.2006.08.086
关键词
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资金
- NIGMS NIH HHS [R01 GM056211] Funding Source: Medline
Early in development, primordial germ cells (PGCs) are set aside from somatic cells and acquire a unique gene-expression program [1].The mechanisms underlying germline-specific gene expression are largely unknown. Nanos expression is required during germline development [2-5] and is posttranscriptionally restricted to PGCs [4,6-8]. Here we report that the microRNA miR-430 targets the 3' untranslated region (UTR) of nanos1 during zebrafish embryogenesis. A miR430 target site within the nanos1 3' UTR reduces poly(A) tail length, mRNA stability, and translation. Repression is disrupted in maternal-zygotic dicer mutants (MZdicer), which lack mature miRNAs [9], and is restored by injection of processed miR-430. Although miR-430 represses other genes equally in germline and soma, specific regions in the nanos1 31 UTR compensate for microRNA-mediated repression in PGCs and allow germline-specific expression. We show that the 3' UTR of an additional PGC-specific gene, TDRD7, is also targeted by miR-430. These results indicate that miR-430 targets the 3' UTRs of germline genes and suggest that differential susceptibility to microRNAs contributes to tissue-specific gene expression.
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