The internal organs of animals often have left–right asymmetry1,2. Although the formation of the anterior–posterior and dorsal–ventral axes in Drosophila is well understood, left–right asymmetry has not been extensively studied. Here we find that the handedness of the embryonic gut and the adult gut and testes is reversed (not randomized) in viable and fertile homozygous Myo31DF mutants. Myo31DF encodes an unconventional myosin, Drosophila MyoIA (also referred to as MyoID in mammals; refs 3, 4), and is the first actin-based motor protein to be implicated in left–right patterning. We find that Myo31DF is required in the hindgut epithelium for normal embryonic handedness. Disruption of actin filaments in the hindgut epithelium randomizes the handedness of the embryonic gut, suggesting that Myo31DF function requires the actin cytoskeleton. Consistent with this, we find that Myo31DF colocalizes with the cytoskeleton. Overexpression of Myo61F, another myosin I (ref. 4), reverses the handedness of the embryonic gut, and its knockdown also causes a left–right patterning defect. These two unconventional myosin I proteins may have antagonistic functions in left–right patterning. We suggest that the actin cytoskeleton and myosin I proteins may be crucial for generating left–right asymmetry in invertebrates.
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We thank the Developmental Studies Hybridoma Bank at the University of Iowa, the Bloomington Stock Center, and the Drosophila Genetic Resource Center at the Kyoto Institute of Technology. We thank J. Lengyel for byn–Gal4 and S. Hayashi for UAS-gfp–moesin transgenic strains. This work was supported by grants-in-aid from the Japanese Ministry of Education, Culture, Sports and Science. Author Contributions Experimental work was performed by S.H., R.M., K.T., M.K., S.S., T.S., P.S. and T.A. Data analysis was by S.H., R.M., K.T. and K.M., and project planning was coordinated by S.N., R.M. and K.M.
Reprints and permissions information is available at npg.nature.com/reprintsandpermissions. The authors declare no competing financial interests.
This file contains Supplementary Tables 1 and 2. Supplementary Table 1 summarizes the results of this paper as the percentage of individual animals with handedness defects in each mutant or expression line. Supplementary Table 2 shows the phenocritical periods for inducing the LR defect by Myo31DF knockdown and by GFP–Moe misexpression. (PDF 136 kb)
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Hozumi, S., Maeda, R., Taniguchi, K. et al. An unconventional myosin in Drosophila reverses the default handedness in visceral organs. Nature 440, 798–802 (2006). https://doi.org/10.1038/nature04625
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