[No authors listed]
The window of embryonic development after fertilization but prior to the beginning of transcription from the zygotic genome is a period that relies heavily on post-transcriptional regulation of gene expression. MicroRNAs constitute one of the predominant mechanisms of post-transcriptional gene regulation, yet their biological function and molecular mechanism of action during this developmental window is poorly understood. Our recent findings demonstrate that the maternal contribution of mir-35 family members contributes to zygotic developmental decisions (sex determination) in C. elegans embryogenesis. Here, I discuss these finding in the context of data from C. elegans and other model organisms regarding the regulation of maternal microRNA activity in early animal embryogenesis.
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