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Multiple actins in Drosophila melanogaster.

S J Horovitch, R V Storti, A Rich

The Journal of Cell Biology

|July 1, 1979

Summary

Drosophila isoactins I, II, and III exhibit distinct tissue specificities. Actin I is muscle-associated, while actins II and III are generalized cellular actins, with a unique stable thoracic actin variant identified.

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Area of Science:

Cell Biology
Developmental Biology
Biochemistry

Background:

Actins are essential cytoskeletal proteins involved in various cellular functions.
Drosophila melanogaster possesses multiple actin isoforms (isoactins) with potentially distinct roles.
Understanding isoactin expression patterns is crucial for deciphering their specific functions in development and tissue differentiation.

Purpose of the Study:

To investigate the tissue and developmental specificities of three Drosophila isoactins (I, II, and III).
To determine the stability and expression patterns of these isoactins across different life stages and tissues.
To identify potential novel actin isoforms or modifications in specialized tissues.

Main Methods:

Two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) was employed.
Analysis of total cellular extracts from various embryonic, larval, and adult Drosophila tissues.
Metabolic labeling with [(35)S]methionine was used to assess protein synthesis.

Main Results:

Isoactins II and III were found to be generalized cellular actins present in all examined Drosophila cell types.
Actin I demonstrated muscle-associated specificity, found exclusively in supercontractile muscles and myogenic cultures.
Actin I expression varied developmentally, becoming prominent in larval muscles and adult abdomen, with a unique stable thoracic actin variant identified in flight muscle.

Conclusions:

Drosophila isoactins exhibit differential expression patterns correlating with specific tissue types and developmental stages.
Actin I plays a significant role in muscle-specific functions throughout Drosophila development.
A novel stable actin species in adult thoracic flight muscle suggests specialized adaptations or a distinct gene product.

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