Heterotrimeric G proteins regulate a noncanonical function of septate junction proteins to maintain cardiac integrity in Drosophila.
Heterotrimeric G proteins regulate a noncanonical function of septate junction proteins to maintain cardiac integrity in Drosophila.
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DOI:
10.1016/j.devcel.2008.10.001
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发表时间:
2008-11
影响因子:
11.8
通讯作者:
Olson, Eric N.
中科院分区:
文献类型:
--
作者:
Yi, Peng;Johnson, Aaron N.;Han, Zhe;Wu, Jiang;Olson, Eric N.
The gene networks regulating heart morphology and cardiac integrity are largely unknown. We previously reported a role for the heterotrimeric G protein γ subunit 1 (Gγ1) in mediating cardial-pericardial cell adhesion in Drosophila. Here we show G-oα47A and Gβ13F cooperate with Gγ1 to maintain cardiac integrity. Cardial-pericardial cell adhesion also relies on the septate junction (SJ) proteins Neurexin-IV (Nrx-IV), Sinuous, Coracle, and Nervana2, and which together function in a common pathway with Gγ1. Furthermore, Gγ1 signaling is required for proper SJ protein localization, and loss of at least one SJ protein, Nrx-IV, induces cardiac lumen collapse. These results are surprising because the embryonic heart lacks SJs and suggest that SJ proteins perform non-canonical functions to maintain cardiac integrity in Drosophila. Our findings unveil the components of a previously unrecognized network of genes that couple G-protein signaling with novel structural constituents of the heart.
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