A Translation-Activating Function of MIWI/piRNA during Mouse Spermiogenesis.
Cell
; 179(7): 1566-1581.e16, 2019 12 12.
Article
en En
| MEDLINE
| ID: mdl-31835033
ABSTRACT
Spermiogenesis is a highly orchestrated developmental process during which chromatin condensation decouples transcription from translation. Spermiogenic mRNAs are transcribed earlier and stored in a translationally inert state until needed for translation; however, it remains largely unclear how such repressed mRNAs become activated during spermiogenesis. We previously reported that the MIWI/piRNA machinery is responsible for mRNA elimination during late spermiogenesis in preparation for spermatozoa production. Here we unexpectedly discover that the same machinery is also responsible for activating translation of a subset of spermiogenic mRNAs to coordinate with morphological transformation into spermatozoa. Such action requires specific base-pairing interactions of piRNAs with target mRNAs in their 3' UTRs, which activates translation through coupling with cis-acting AU-rich elements to nucleate the formation of a MIWI/piRNA/eIF3f/HuR super-complex in a developmental stage-specific manner. These findings reveal a critical role of the piRNA system in translation activation, which we show is functionally required for spermatid development.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Iniciación de la Cadena Peptídica Traduccional
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Espermatogénesis
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ARN Interferente Pequeño
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Proteínas Argonautas
Límite:
Animals
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Humans
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Male
Idioma:
En
Revista:
Cell
Año:
2019
Tipo del documento:
Article
País de afiliación:
China