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Citation
Parks, S., Wakimoto, B.T., Spradling, A. (1986). Replication and expression of an X-linked cluster of Drosophila chorion genes.  Dev. Biol. 117(): 294--305.
FlyBase ID
FBrf0044152
Publication Type
Research paper
Abstract

Two 80- to 100-kb chromosomal replicons containing clustered chorion genes amplify in the ovarian follicle cells during the final 22 hr of Drosophila oogenesis. We have studied the relationship between amplification and transcription within one of these domains, located at 7E10-7F3,4 on the X chromosome. A tandem cluster of six genes, encoding chorion structural proteins s36-1, s38-1, and four putative minor chorion protein mRNAs, was mapped in the central 18 kb of the amplified domain, a region showing the highest levels of amplification. The regions both proximal and distal to this gene cluster, where lower levels of amplification occur, were also transcribed in ovary, but mRNAs produced specifically during choriogenesis were not detected. Thus, differences in amplification do not appear to modulate differential RNA accumulation. Instead, the gradient of amplification observed in egg chamber DNA may simply reflect the mechanism of amplification. In the female sterile mutation, In(1)ocelliless, a chromosomal rearrangement separates the central gene cluster into two parts, only one of which retains the capacity to amplify. Genes located within the unamplified portion of the ocelliless chromosome were expressed at the appropriate time during oogenesis, but at a 5- to 10-fold reduced level of RNA per gene. Thus neither cluster integrity nor amplification are required for the normal developmental program of gene expression within the cluster.

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    Language of Publication
    English
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Journal
    Abbreviation
    Dev. Biol.
    Title
    Developmental Biology
    Publication Year
    1959-
    ISBN/ISSN
    0012-1606
    Data From Reference
    Aberrations (1)
    Gene Groups (1)
    Genes (6)