3 years ago

A quantitative hypermorphic <i>CNGC</i> allele confers ectopic calcium flux and impairs cellular development

Andreas Brachmann, David M Chiasson, Kristina Haage, Katharina Sollweck, Martin Parniske, Petra Dietrich
The coordinated control of Ca2+ signaling is essential for development in eukaryotes. Cyclic nucleotide-gated channel (CNGC) family members mediate Ca2+ influx from cellular stores in plants1-4. Here we report the unusual genetic behavior of a quantitative gain-of-function CNGC mutation (brush) in Lotus japonicus resulting in a leaky tetrameric channel. brush resides in a cluster of redundant CNGCs encoding subunits which resemble metazoan voltage-gated potassium (Kv1-Kv4) channels in assembly and gating properties. Plants homozygous for brush are impaired in root development and infection by nitrogen-fixing rhizobia which segregated as a recessive monogenic trait. The brush allele exhibited quantitative behavior since overexpression of the cluster subunits was required to suppress the brush phenotype. The results reveal a mechanism by which quantitative competition between channel subunits for tetramer assembly can impact the phenotype of the mutation carrier.

Publisher URL: https://elifesciences.org/articles/25012

DOI: 10.7554/eLife.25012

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