Transmission electron microscopy of thin sections of Drosophila: Conventional chemical fixation of embryos using trialdehyde

Kent L. McDonald, David J. Sharp, Wayne Rickoll

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

High-pressure freezing (HPF) followed by freeze-substitution is a valuable method for specimen preservation for transmission electron microscopy (TEM) in Drosophila. However, not all projects require this level of precision. In addition, some tissues are too large to fit into the HPF specimen carriers, and some fly tissues such as eyes and ovaries do not freeze well. This protocol describes a trialdehyde fixation procedure for embryos, to be used in situations where optimal preservation is not required or when HPF is not an option. Because the vitelline membrane is impermeable to aqueous solvents, it is necessary to either mechanically disrupt it or render it permeable by treatment with organic solvents. Good ultrastructural preservation has been achieved by puncturing embryos immersed in fixative with extremely sharp tungsten needles, as described here.

Original languageEnglish (US)
Pages (from-to)516-520
Number of pages5
JournalCold Spring Harbor Protocols
Volume7
Issue number4
DOIs
StatePublished - Apr 1 2012
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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