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Correlated changes in steady-state levels of Balbiani ring mRNAs and secretory polypeptides in salivary glands of Chironomus tentans

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Abstract

Balbiani rings (BRs) on polytenized chromosomes in Chironomid salivary glands contain members of a homologous multigene family that encodes a family (the sp-I family) of high M r secretory polypeptides. Each of these BR genes is comprised largely of tandemly duplicated core repeat sequences consisting of related constant (C) regions and intergenically divergent subrepeat (SR) regions. A set of oligodeoxyribonucleotide probes were synthesized that correspond to the transcribed strand of the SR region of BR1, BR2α, BR2/β, and BR6 core repeats. Under a defined set of conditions, it was possible to show that each oligonucleotide probe hybridized exclusively to its cognate repeat type without hybridization to other repeat types in cloned DNA templates. These BR probes were then used in dotblot hybridization experiments to simultaneously follow alterations in the steady-state level of BR mRNAs in response to prolonged exposure of larvae to galactose. The results indicated that the relative amounts of these four BR mRNAs may change in a noncoordinate manner. These BR probes were also used in experiments to compare simultaneously the salivary gland content of sp-I components and specific BR mRNAs in larvae that exhibited naturally occurring or induced alterations in BR gene expression. A correlation was found which suggested that sp-Ia is encoded in a gene comprised of BR1 repeats, sp-Ib is encoded by BR2β repeats, sp-Ic is encoded by BR6 repeats and sp-Id is encoded by BR2α repeats.

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  1. Department of Biochemistry, The University of Mississippi Medical Center, 39216-4505, Jackson, MS, USA

    Steven T. Case

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Case, S.T. Correlated changes in steady-state levels of Balbiani ring mRNAs and secretory polypeptides in salivary glands of Chironomus tentans . Chromosoma 94, 483–491 (1986). https://doi.org/10.1007/BF00292758

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  • DOI: https://doi.org/10.1007/BF00292758

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