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Requirements for scribble expression in newly formed gonads of Drosophila embryos
Joachim Marhold1, Fani Papagiannouli, Mingfa Li
1Department of Developmental Genetics, Deutsches Krebsforschungszentrum, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany.
Abstract:
The tumour suppressor gene scribble (scrib) is required for epithelial polarity and growth control in Drosophila, and encodes two protein isoforms. Here, we report the pattern of Scrib1 synthesis in pole cells and embryonic gonads. We found that Scrib1 synthesis became strongly enhanced in pole cells at the time of gonad formation and was also detectable in cortical domains of gonadal mesodermal cells adjacent to pole cells. Scrib1 synthesis in mesodermal cells was independent of pole cells and occurred in agametic valois and capsuléen embryonic gonads. In contrast, Scrib1 synthesis in pole cells required contact with gonadal mesodermal cells as revealed by the absence of Scrib1 in wunen or tinman-zinc finger homeodomain-1 pseudo-gonads made only of aggregated pole cells.
Insights
Tumor suppressor scribble (scrib) protein synthesis is crucial for Drosophila gonad development. Scrib1 is enhanced in pole cells upon gonad formation and requires mesodermal cell contact, while mesodermal Scrib1 synthesis is independent of pole cells.
Area of Science:
- Developmental biology
- Cell biology
- Genetics
Background:
- The tumor suppressor gene scribble (scrib) plays a vital role in epithelial polarity and growth control.
- Scrib encodes two protein isoforms, with Scrib1 being the focus of this study.
- Understanding gene expression patterns during embryonic development is crucial for uncovering mechanisms of organogenesis.
Purpose of the Study:
- To investigate the synthesis pattern of Scrib1 in Drosophila pole cells and embryonic gonads.
- To determine the relationship between Scrib1 synthesis in pole cells and gonadal mesodermal cells.
- To elucidate the regulatory mechanisms controlling Scrib1 expression during gonad formation.
Main Methods:
- Analysis of Scrib1 protein synthesis in various Drosophila embryonic gonad mutants.
- Utilizing immunofluorescence to detect Scrib1 protein localization.
- Generating pseudo-gonads composed of aggregated pole cells to study cell-cell contact dependency.
Main Results:
- Scrib1 synthesis is significantly enhanced in pole cells during gonad formation.
- Scrib1 is also detected in gonadal mesodermal cells adjacent to pole cells.
- Scrib1 synthesis in mesodermal cells is independent of pole cells.
- Scrib1 synthesis in pole cells necessitates contact with gonadal mesodermal cells.
Conclusions:
- Scrib1 plays a critical role in Drosophila gonad development, with distinct regulatory patterns in pole cells and mesodermal cells.
- Cell-cell interactions between pole cells and gonadal mesodermal cells are essential for regulating Scrib1 synthesis in germline precursors.
- The findings provide insights into the molecular mechanisms governing germ cell-mesoderm interactions during gonad formation.