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. 1992 Sep 15;89(18):8601–8605. doi: 10.1073/pnas.89.18.8601

3'-modified antisense oligodeoxyribonucleotides complementary to calmodulin mRNA alter behavioral responses in Paramecium.

R D Hinrichsen 1, D Fraga 1, M W Reed 1
PMCID: PMC49968  PMID: 1528867

Abstract

The calcium-binding protein calmodulin has been shown to modulate the Ca(2+)-dependent ion channels of Paramecium tetraurelia. Mutations in the calmodulin gene of Paramecium result in an altered pattern of behavioral responses. Antisense oligodeoxyribonucleotides (ODNs), complementary to calmodulin mRNA in Paramecium, were synthesized from a modified solid support that introduced a 3'-hydroxyhexyl phosphate. These 3'-modified ODNs were tested for their ability to alter the behavioral response of Paramecium. The microinjection of antisense ODNs temporarily reduced the backward swimming behavior of the cells in test solutions containing Na+. The injection of sense and random 3'-modified ODNs, or unmodified antisense ODNs, had no effect. The antisense ODN-induced effect was reversed by the injection of calmodulin protein. The pattern of response of the injected cells in various behavioral test solutions indicated that the calmodulin antisense ODNs reduce the Ca(2+)-dependent Na+ current. Antisense ODNs, complementary either to the 5' start site or to an internal sequence of the calmodulin mRNA, were similarly effective in altering behavior. These results show that antisense ODNs may be utilized in ciliated protozoa as a tool for reducing the expression of specific gene products. In addition, Paramecium represents a powerful model system with which to study and develop antisense ODN technology.

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Selected References

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