Abstract
The Drosophila melanogaster actin genes comprise a dispersed multigene family1,2 of six genes, one at each of six scattered chromosomal loci (refs 1,2 and unpublished observations). These genes encode the Drosophila actins I, II and III3,4, which can be separated in the isoelectric focusing dimension of two-dimensional gels. Actins II and III have been found in all tissues, with actin III an unstable species except in adult thorax5, while actin I, the most acidic form, appears during larval myogenesis both in vivo and in vitro3,4. Some actins therefore seem to be developmentally regulated. If individual members of a multigene family are regulated at the transcriptional level, this implies that developmental mechanisms of gene regulation can be elucidated by comparing gene family members. We report here a pattern of transcriptional activity of the D. melanogaster actin gene at the 79B chromosomal locus. Our results suggest that the 79B actin gene encodes actin I, the larval muscle-specific actin, and that actin I is synthesized initially as a precursor. The precursor co-migrates with cytoplasmic actin at the position of actin II and is subsequently acetylated to form actin I.
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Zulauf, E., Sánchez, F., Tobin, S. et al. Developmental expression of a Drosophila actin gene encoding actin I. Nature 292, 556–558 (1981). https://doi.org/10.1038/292556a0
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DOI: https://doi.org/10.1038/292556a0
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