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The left-right determinant Inversin is a component of node monocilia and other 9+0 cilia

Watanabe, Daisuke, Saijoh, Yukio, Nonaka, Shigenori, Sasaki, Genta, Ikawa, Yayoi, Yokoyama, Takahiko, Hamada, Hiroshi·2003·Development

Abstract

Inversin (Inv), a protein that contains ankyrin repeats, plays a key role in left-right determination during mammalian embryonic development, but its precise function remains unknown. Transgenic mice expressing an Inv and green fluorescent protein (GFP) fusion construct (Inv::GFP) were established to facilitate characterization of the subcellular localization of Inv. TheInv::GFP transgene rescued the laterality defects and polycystic kidney disease of Inv/Inv mice, indicating that the fusion protein is functional. In transgenic embryos, Inv::GFP protein was detected in the node monocilia. The fusion protein was also present in other 9+0 monocilia,including those of kidney epithelial cells and the pituitary gland, but it was not localized to 9+2 cilia. The N-terminal region of Inv (InvΔC)including the ankyrin repeats also localized to the node cilia and rescued the left-right defects of Inv/Inv mutants. Although no obvious abnormalities were detected in the node monocilia of Inv/Inv embryos,the laterality defects of such embryos were corrected by an artificial leftward flow of fluid in the node, suggesting that nodal flow is impaired by the Inv mutation. These results suggest that the Inv protein contributes to left-right determination as a component of monocilia in the node and is essential for the generation of normal nodal flow.

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Crossref · 10.1242/dev.00407

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Metadata

Authors
Watanabe, D., Saijoh, Y., Nonaka, S., Sasaki, G., Ikawa, Y., Yokoyama, T., & Hamada, H.
Venue
Development
Published
2003-05-01
Volume
130
Issue
9
Pages
1725-1734
ISSN
  • 0950-1991 (ISSN-L)
  • 1477-9129
OpenAlex
W2106586740
Cited by
193
References
2
FWCI
10.38
Type
journal article
Language
en
Open access
closed

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