Worm Breeder's Gazette 14(5): 45 (February 1, 1997)
These abstracts should not be cited in bibliographies. Material contained herein should be treated as personal communication and should be cited as such only with the consent of the author.
Molecular Biology, Department of Biology, Faculty of Science, Okayama University, Okayama Japan
The order of egg and chicken is still in question as which is the first gene duplication or tissue diversity. Numbers of a gene or an isoform will give a hint to solve the question. We are studying on function and structure of muscle genes in C. elegans. Two of each myosin heavy chain genes express in the pharynx and the body wall muscles. One paramyosin gene unc-15 express in both muscles. The troponin C gene tnc-1(pat-10) expressed in the body wall. cDNA fragment of tnc-1 hybridized to only one locus on the YAC library. From the tropomyosin gene tmy-1(lev-11), one isoform express in the pharynx with internal promoter and two isoforms express in the body wall with the proximal promoter. We confirmed that one of two isoforms expressed in the body wall was alternatively spliced by using exon-specific lacZ fusion plasmid. Although we did not confirm the functional difference of these two isoforms, this result suggests that gene diversity by alternative splicing appeared before tissue differentiation. Two troponin I genes were also expressed in the body wall at the different rate (Kuroda et al. unpublished). Another cDNA sequence of troponin C and more than two troponin I like sequences appeared in ACEDB. These results suggest also the idea that a gene duplication or amplification is the first. To know functional difference of multiple isoforms we are asking when and how these isoforms can function in their specific!tissues. Another important thing is the order to isolate mutants or to isolate the gene. We have historically known that isolating mutants is the first. Up to date reverse genetics is very popular even in the laboratory of an expert in hunting mutants. We have to change a mind or shift the head for getting interesting answer. To understanding character of a gene undergraduate students may know you the sequence information during isolating mutants in your experiment. Sequence information is not all but very powerful. Touching the keyboard may be the first before to handle a pipettman or plastic tube. And you can find function of a gene in the worm. Finally you can know the order of egg or the worm. Finally thinking science is much easier than doing science.