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Broad-complex function during oogenesis in Drosophila melanogaster.

R Y Huang1, W C Orr

  • 1Department of Biological Sciences, Southern Methodist University, Dallas, Texas 75275.

Developmental Genetics
|January 1, 1992
PubMed
Summary
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The Broad-Complex (BR-C) gene

Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • The Broad-Complex (BR-C) gene regulates ecdysone-mediated development.
  • Its role in oogenesis, the process of egg cell formation, is not well understood.

Purpose of the Study:

  • To investigate the function of the Broad-Complex (BR-C) during oogenesis.
  • To characterize a novel mutation affecting BR-C and its impact on egg development.

Main Methods:

  • Heteroallele studies and clonal analysis were used to identify and characterize mutations.
  • Gypsy transposon insertion site mapping and transcript analysis were performed.
  • Suppression studies using su(f) and su(Hw) were conducted.
  • Analysis of chorion gene amplification in oogenesis.

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Main Results:

  • A somatic mutation, de12, was identified within the Broad-Complex (BR-C) gene domain.
  • The de12 mutation resulted from a gypsy transposon insertion, showing ovarian-specific activation.
  • Gypsy activation and de12 phenotype were partially suppressed by su(f) and su(Hw).
  • Distinct transcript profiles were observed in de12 mutants compared to the parent strain.
  • Premature arrest of chorion gene amplification occurred in de12 mutants during late oogenesis.

Conclusions:

  • The Broad-Complex (BR-C) plays a role in oogenesis.
  • Gypsy transposon insertion within BR-C disrupts normal oogenesis, affecting chorion gene amplification.
  • Genetic suppressors su(f) and su(Hw) modulate the effects of the gypsy insertion.