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Recovery and Characterization of Temperature-Sensitive Mutations Affecting Adult Viability in DROSOPHILA

T Homyk1, D A Sinclair, D T Wong

  • 1Department of Zoology, The University of British Columbia, Vancouver, British Columbia, Canada.

Genetics
|June 1, 1986
PubMed
Summary

Researchers isolated temperature-sensitive (ts) Drosophila mutants to pinpoint affected cell types in development. This study details 19 new X-linked lethal loci, aiding the study of pattern formation and cell-lethal mutations.

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Area of Science:

  • Developmental biology
  • Genetics
  • Drosophila melanogaster research

Background:

  • Temperature-sensitive (ts) cell-lethal mutations are crucial tools for studying Drosophila development, including pattern formation.
  • Identifying the specific cell types affected by these mutations enhances their utility.
  • Previous research has utilized ts mutations but lacked precise cellular localization.

Purpose of the Study:

  • To isolate and characterize new X-linked adult-lethal (adl) mutants in Drosophila.
  • To determine the specific cell types and developmental stages affected by these lethal mutations.
  • To facilitate a more refined understanding of gene function during development.

Main Methods:

  • Isolation and characterization of 21 EMS-induced X-linked adult-lethal (adl) mutants, with 16 being temperature-sensitive (ts).

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  • Analysis of ts lethal effects during preimaginal development.
  • In-depth focus mapping, temperature shift, and heat-pulse studies on specific mutant strains (adl-1(ts), sesE, adl-2(ts), rex).
  • Mosaic analysis to resolve foci of lethality in different tissues.

    • Main Results:

    • 19 distinct X-linked loci were identified, with most exhibiting ts lethal effects during development.
    • adl-1 showed two temperature-sensitive periods (TSPs) affecting embryogenesis and pupariation, with mesodermal foci for leg paralysis linked to muscle maintenance.
    • sesE exhibited two TSPs impacting larval stages and pupation, with neural foci for leg paralysis.
    • adl-2(ts) displayed paired lethal foci near the subesophageal ganglion, and rex mosaics revealed mesodermal foci for leg paralysis.

    Conclusions:

    • The study successfully generated and characterized novel ts lethal mutants in Drosophila, expanding the toolkit for developmental studies.
    • Detailed analysis revealed specific cellular (mesodermal, neural) and temporal (TSPs) requirements for gene function during development.
    • These findings provide a foundation for further investigation into the precise roles of these genes in Drosophila development and pattern formation.