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The mago nashi gene is required for the polarisation of the oocyte and the formation of perpendicular axes in Drosophila
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Background Drosophila axis formation requires a series of inductive interactions between the oocyte and the somatic follicle cells. Early in oogenesis, Gurken protein, a member of the transforming growth factor alpha family, is produced by the oocyte to induce the adiacent follicle cells to adopt a posterior cell fate. These cells subsequently send an unidentified signal back to the oocyte to induce the formation of a polarised microtubule array that defines the anterior-posterior axis. The polarised microtubules also direct the movement of the nucleus and gurken mRNA from the posterior to the anterior of the oocyte, where Gurken signals a second time to induce the dorsal follicle cells, thereby polarising the dorsal-ventral axis. Results In addition to its previously described role in the localisation of oskar mRNA, the mago nashi gene is required in the germ line for the transduction of the polarising signal from the posterior follicle cells. Using a new in vivo marker for microtubules, we show that mago nashi mutant oocytes develop a symmetric microtubule cytoskeleton that leads to the transient localisation of bicoid mRNA to both poles. Furthermore, the oocyte nucleus often fails to migrate to the anterior, causing the second Gurken signal to be sent in the same direction as the first. This results in a novel phenotype in which the anterior of the egg is ventralised and the posterior dorsalised, demonstrating that the migration of the oocyte nucleus determines the relativ…
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“If nuclear movement is prevented as in mutants of mago or when the Grk signal is delayed, eggs develop that have a normal AP axis, but lack DV polarity orthogonal to the AP axis (figure 3b; Micklem et al. 1997; Peri & Roth 2000).”
From The origin of dorsoventral polarity in Drosophila (2003) · cites this paper as Micklem et al. 1997
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The origin of dorsoventral polarity in Drosophila
Roth, S. (2003) · Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences · doi:10.1098/rstb.2003.1325 · Cited by 87
Metadata
- Authors
- Micklem, D. R., Dasgupta, R., Elliott, H., Gergely, F., Davidson, C., Brand, A., González-Reyes, A., & St Johnston, D.
- Affiliations
- University of Cambridge (GB)
- Venue
- Current Biology
- Publisher
- Elsevier BV
- Published
- 1997-07
- Volume
- 7
- Issue
- 7
- Pages
- 468-478
- ISSN
- 0960-9822 (ISSN-L)
- OpenAlex
- W1970284326
- Cited by
- 189
- References
- 0
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2022: 4 · 2021: 1 · 2020: 4 · 2019: 2 · 2018: 4 · 2017: 2 · 2016: 10 · 2015: 4 · 2014: 10 · 2013: 4 · 2012: 6
- FWCI
- 2.96
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Current Biology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Wellcome Trust
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
- Keywords
- oocyte polarity, Drosophila oogenesis, axis formation, follicle cells, microtubule cytoskeleton, anterior-posterior axis, dorsal-ventral axis
- MeSH terms
- Amino Acid Sequence, Animals, Base Sequence, Cell Nucleus, DNA, Drosophila, Female, Humans, Microtubules, Molecular Sequence Data, Mutation, Nuclear Proteins, Oocytes, Transforming Growth Factors, Trans-Activators, Transforming Growth Factor alpha, RNA-Binding Proteins, Cell Polarity, Genes, Insect, Sequence Homology, Amino Acid, Homeodomain Proteins, Insect Proteins, Body Patterning, Drosophila Proteins
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