Mature spermatozoa contain a whole repertoire of the various classes of cellular RNAs, both coding and non-coding. It was hypothesized that after fertilization they might impact development, a claim supported by experimental evidence in various systems. Despite the current increasing interest in the transgenerational maintenance of epigenetic traits and their possible determination by RNAs, little remains known about conservation in sperm and across generations and the specificities and mechanisms involved in transgenerational maintenance.
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