Genetics, Vol 135, 385-404, Copyright © 1993


INVESTIGATIONS

Sequence Requirements for Myosin Gene Expression and Regulation in Caenorhabditis elegans

P. G. Okkema, S. W. Harrison, V. Plunger, A. Aryana and A. Fire
Carnegie Institution of Washington, Department of Embryology, Baltimore, Maryland 21210

Four Caenorhabditis elegans genes encode muscle-type specific myosin heavy chain isoforms: myo-1 and myo-2 are expressed in the pharyngeal muscles; unc-54 and myo-3 are expressed in body wall muscles. We have used transformation-rescue and lacZ fusion assays to determine sequence requirements for regulated myosin gene expression during development. Multiple tissue-specific activation elements are present for all four genes. For each of the four genes, sequences upstream of the coding region are tissue-specific promoters, as shown by their ability to drive expression of a reporter gene (lacZ) in the appropriate muscle type. Each gene contains at least one additional tissue-specific regulatory element, as defined by the ability to enhance expression of a heterologous promoter in the appropriate muscle type. In rescue experiments with unc-54, two further requirements apparently independent of tissue specificity were found: sequences within the 3' non-coding region are essential for activity while an intron near the 5' end augments expression levels. The general intron stimulation is apparently independent of intron sequence, indicating a mechanistic effect of splicing. To further characterize the myosin gene promoters and to examine the types of enhancer sequences in the genome, we have initiated a screen of C. elegans genomic DNA for fragments capable of enhancing the myo-2 promoter. The properties of enhancers recovered from this screen suggest that the promoter is limited to muscle cells in its ability to respond to enhancers.


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S Strome, P Martin, E Schierenberg, and J Paulsen
Transformation of the germ line into muscle in mes-1 mutant embryos of C. elegans
Development, January 9, 1995; 121(9): 2961 - 2972.
[Abstract] [PDF]


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DevelopmentHome page
P. Okkema and A Fire
The Caenorhabditis elegans NK-2 class homeoprotein CEH-22 is involved in combinatorial activation of gene expression in pharyngeal muscle
Development, January 8, 1994; 120(8): 2175 - 2186.
[Abstract] [PDF]