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Level 12 Ovo

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Last Updated: 06 November 2020

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Otu and ovo are require cell autonomously in female germline for germ cell proliferation and differentiation. XY germ cells do not require otu when developing in testes, but become dependent on otu function for proliferation when placed in ovary. The requirement for ovo is dependent on cell autonomous signal deriving from X: ratio. Differential regulation of otu and ovo genes provides a mechanism for female germline to incorporate both somatic and cell-autonomous inputs required for oogenesis. All ovo are alleles are fully penetrant for female sterility; no male function for ovo + known. Lack of zygotic activity results in complete absence of germ-line cells in adult female; reduction in numbers of germ cells was first evident during early gastrulation. Homozygotes for weaker alleles produce germ cells, but oogenesis defective; egg chambers may degenerate prior to vitellogenesis or proceed through oogenesis and be oviposited, depending on allele; laid eggs are permeable to neutral red and never develop. Heterozygotes for two of the dominant alleles are phenotypically similar to homozygotes for weak recessive alleles. Ovarian tumors form in females carrying ovo D3 in heterozygous combination with hypomorphic alleles, eg, ovo D1rv20, or with snf. Ovo D2 mutation is partially suppressed by many Sxl alleles. Ovo D1 / + females produce no eggs; extensively utilize in selection of ovo + germ-line clones. Svb alleles are homozygous lethal. There are many fewer denticles than wild type; remaining denticles are small and with characteristic morphology. Denticles arrange in belts in abdominal segments; absent from thoracic segments. Cell autonomous in mosaics; useful in studying embryonic mosaics.

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* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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