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Bayer LV, Milano S, Formel SK, Kaur H, Ravichandran R, Cambeiro JA, Slinko L, Catrina IE, Bratu DP. Cup is essential for oskar mRNA translational repression during early Drosophila oogenesis. RNA Biol 2023; 20:573-587. [PMID: 37553798 PMCID: PMC10413924 DOI: 10.1080/15476286.2023.2242650] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 06/27/2023] [Accepted: 07/20/2023] [Indexed: 08/10/2023] Open
Abstract
Study of the timing and location for mRNA translation across model systems has begun to shed light on molecular events fundamental to such processes as intercellular communication, morphogenesis, and body pattern formation. In D. melanogaster, the posterior mRNA determinant, oskar, is transcribed maternally but translated only when properly localized at the oocyte's posterior cortex. Two effector proteins, Bruno1 and Cup, mediate steps of oskar mRNA regulation. The current model in the field identifies Bruno1 as necessary for Cup's recruitment to oskar mRNA and indispensable for oskar's translational repression. We now report that this Bruno1-Cup interaction leads to precise oskar mRNA regulation during early oogenesis and, importantly, the two proteins mutually influence each other's mRNA expression and protein distribution in the egg chamber. We show that these factors stably associate with oskar mRNA in vivo. Cup associates with oskar mRNA without Bruno1, while surprisingly Bruno1's stable association with oskar mRNA depends on Cup. We demonstrate that the essential factor for oskar mRNA repression in early oogenesis is Cup, not Bruno1. Furthermore, we find that Cup is a key P-body component that maintains functional P-body morphology during oogenesis and is necessary for oskar mRNA's association with P-bodies. Therefore, Cup drives the translational repression and stability of oskar mRNA. These experimental results point to a regulatory feedback loop between Bruno 1 and Cup in early oogenesis that appears crucial for oskar mRNA to reach the posterior pole and its expression in the egg chamber for accurate embryo development.
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Affiliation(s)
- Livia V. Bayer
- Department of Biological Sciences, Hunter College, City University of New York, New York, NY, USA
- Program in Molecular, Cellular, and Developmental Biology, the Graduate Center, City University of New York, New York, NY, USA
| | - Samantha Milano
- Department of Biological Sciences, Hunter College, City University of New York, New York, NY, USA
- Program in Molecular, Cellular, and Developmental Biology, the Graduate Center, City University of New York, New York, NY, USA
| | - Stephen K. Formel
- Department of Biological Sciences, Hunter College, City University of New York, New York, NY, USA
| | - Harpreet Kaur
- Department of Biological Sciences, Hunter College, City University of New York, New York, NY, USA
| | - Rishi Ravichandran
- Department of Biological Sciences, Hunter College, City University of New York, New York, NY, USA
| | - Juan A. Cambeiro
- Department of Biological Sciences, Hunter College, City University of New York, New York, NY, USA
| | - Lizaveta Slinko
- Department of Biological Sciences, Hunter College, City University of New York, New York, NY, USA
| | - Irina E. Catrina
- Department of Chemistry and Biochemistry, Yeshiva University, New York, NY, USA
| | - Diana P. Bratu
- Department of Biological Sciences, Hunter College, City University of New York, New York, NY, USA
- Program in Molecular, Cellular, and Developmental Biology, the Graduate Center, City University of New York, New York, NY, USA
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