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  • Yolk protein genes  (3)
  • Yolk proteins  (3)
  • 1
    Electronic Resource
    Electronic Resource
    The sequence and expression pattern of the Calliphora erythrocephala yolk protein A and B genes (1994)
    Springer
    Journal of molecular evolution 38 (1994), S. 336-351 
    Details
    ISSN: 1432-1432
    Keywords: Yolk protein genes ; Vitellogenesis ; Calliphora ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The yolk protein genes (yps) are expressed in a temporal, tissue- and sex-specific fashion in Drosophila melanogaster. Here we report the sequence of two related genes in Calliphora erythrocephala. The predicted Calliphora yolk protein (YP) sequences are well conserved, especially at the C-terminal end when compared to those of D. melanogaster and Ceratitis capitata. Database searches with the Calliphora yolk protein B (CeYPB) sequence identify the vertebrate lipase similarity reported for the YPs of Drosophila and Ceratitis. Moreover, sequences with identity to divalent ion-binding sites were observed, which colocalized with putative tyrosine sulfation sites. Calliphora oogenesis differs from Drosophila in that it is cyclic in response to a meat feed. The Calliphora yp genes are expressed in the follicle cells of the egg chamber during vitellogenesis, as shown by in situ hybridization, and the yp message levels correlate with YP synthesis. The synthesis of the yp transcripts in ovaries of Calliphora occurs in the same pattern as that for ovarian transcripts in Drosophila. In the carcass, yp transcript levels are correlated with the production of a batch of eggs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163151
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  • 2
    Electronic Resource
    Electronic Resource
    Separate DNA sequences are required for normal female and ecdysone-induced male expression of Drosophila melanogaster yolk protein 1 (1987)
    Springer
    Molecular genetics and genomics 210 (1987), S. 153-155 
    Details
    ISSN: 1617-4623
    Keywords: Drosophila melanogaster ; Yolk proteins ; Gene fusion ; 20-Hydroxyecdysone ; Sex determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Drosophila melanogaster flies were transformed with a yp1-Adh fusion gene with 890 bp of yp1 5′ flanking sequence. In an Adh - background these flies show a stage, tissue and sex-specific pattern of alcohol dehydrogenase (ADH) activity characteristic of yolk protein genes. ADH activity is not present in dsx D/dsx pseudomales indicating that this fragment contains sites where the dsx gene product exerts its effect. Transformed male flies do not exhibit ADH activity when injected with 20-hydroxyecdysone while synthesis of native yolk proteins is induced. Thus the hormone inducibility and sex regulation have been separated in this construct.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337772
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of cis-acting sequences regulating expression of the gene encoding yolk protein 3 in Drosophila melanogaster (1991)
    Springer
    Molecular genetics and genomics 230 (1991), S. 219-224 
    Details
    ISSN: 1617-4623
    Keywords: P element transformation ; Yolk proteins ; Drosophila ; Tissue-specific enhancers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The regulatory sequences leading to the ovarian and fat body expression of yolk proteins 1 and 2 (YP1 and 2) of Drosophila melanogaster have been characterised in some detail. These genes (yp1 and yp2) share many enhancer elements, and some important regulatory sequences lie within the coding regions. We have begun to investigate the cis-regulation of the gene encoding yolk protein 3 (yp3). We describe a system for P element transformation using the complete and unaltered yp3 gene rather than reporter genes and describe sequences conferring correct expression in the ovary and carcass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290671
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  • 4
    Electronic Resource
    Electronic Resource
    Nutritional response in aDrosophila yolk protein gene promoter (1995)
    Springer
    Molecular genetics and genomics 248 (1995), S. 25-32 
    Details
    ISSN: 1617-4623
    Keywords: Yolk protein genes ; Nutrition Vitellogenesis ; Gene regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The yolk protein genes(yps) of Drosophila melanogaster are only expressed in the ovary and fat body of female flies if they are supplied with proteinaceous food. This nutritional response is specific to theyp genes. We have used transgenic flies transformed with a series of constructs bearing deletions in the upstream region of theyp1 andyp2 genes attached to a reporter gene to search for DNA sequences responsible for the nutritional induction specific foryp1 andyp2 genes. Several regions were shown independently of each other to confer nutritional regulation on the expression of theyp1 andyp2 genes. This regulation can be induced both on theyp promoter and the heterologousDrosophila heat-shock 70 (hsp70) promoter. The redundancy of sequences conferring a nutritional response on theyp genes is similar to that observed for the female specificity of these genes and suggests that several DNA binding proteins interact to provide the correct regulation of these genes. These results suggest that nutrition acts to modify the level of atrans-acting factor in the fat body. Northern blot analysis showed that the transcript levels from thedsx gene are not affected by nutrition, indicating that the response is not mediated via thedsx gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02456610
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  • 5
    Electronic Resource
    Electronic Resource
    Egg production and fertility in Drosophila depend upon the number of yolk-protein gene copies (1991)
    Springer
    Molecular genetics and genomics 228 (1991), S. 324-327 
    Details
    ISSN: 1617-4623
    Keywords: Yolk proteins ; Gene families ; Evolution ; Egg production ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The yolk proteins of Drosophila melanogaster comprise a family of three related yolk polypeptides each encoded by a single-copy gene. We show by genetic crosses that each gene makes an equivalent contribution to the fecundity and fertility of the female and they do not individually provide unique functions to the embryo. We show that the number of eggs laid by a female depends upon the number of genes encoding yolk polypeptides present in the genome and furthermore that the probability of an egg hatching into an adult also critically depends upon the number of yolk protein genes present in the mother. This suggests that the three yolk protein-encoding genes in Drosophila melanogaster may have arisen by duplication, then been maintained for quantitative reasons because they increased egg production and fertility, rather than each protein evolving a different function as is the case with most small gene families, such as tubulins and collagen genes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282485
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  • 6
    Electronic Resource
    Electronic Resource
    Cis-regulatory sequences leading to female-specific expression of yolk protein genes 1 and 2 in the fat body of Drosophila melanogaster (1993)
    Springer
    Molecular genetics and genomics 237 (1993), S. 41-48 
    Details
    ISSN: 1617-4623
    Keywords: Yolk protein genes ; dsx ; Sex determination ; Gene regulation ; Enhancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The three yolk protein genes (yp) of Drosophila melanogaster are transcribed in a sex- and tissue-limited fashion. We have searched for cis-regulatory sequences in regions flanking yp1 and yp2 to identify the elements that confer female-specific expression in the fat body. One such 127 by element has previously been identified in this region. We show here the existence of two additional regions which confer female fat body-specific expression on an Adh reporter gene and on the native yp2 gene, respectively. This suggests some redundancy in the regulation of expression of the yp genes. Computer searches for putative binding sites for the DSX protein, which regulates sex-specific expression of the yp genes, revealed several such sites in our constructs. However, the significance of these is unclear since many such sites also occur in genes which one would not expect to be regulated in a sex-specific manner (e.g. Adh, Actin 5C). We suggest that DSX acts in concert with other proteins to mediate sex- and tissue-specific expression of the yp genes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282782
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