Investigation of the Biological Function of Plant Cyclic Nucleotide Gated Ion Channel 2 in Auxin Signaling
Bibliographic record
Abstract
Calcium (Ca2+) is a ubiquitously important signaling molecule in eukaryotic cells. For plants, developmental cues, and signals from the environment lead to changes in cellular Ca2+ concentrations that are required to activate appropriate responses. CYCLIC NUCLEOTIDE GATED CHANNELS (CNGCs) are ion channels that are thought to conduct cations like Ca2+ in plant cells. Of the 20 members of the Arabidopsis CNGC family, the isomer CNGC2 is of special interest as the loss-of-function of CNGC2 leads to defects in multiple physiological processes. In this thesis, I investigated the biological function of CNGC2 and propose that CNGC2 is important in auxin homeostasis in addition to its prescribed role in immunity. The first suppressor of the autoimmune CNGC2 null mutant was found to carry a mutation in the auxin biosynthesis gene YUCCA6 (YUC6). An investigation into alterations in auxin signals revealed that the CNGC2 knockout mutant cngc2 exhibits abnormalities in auxin signaling and hyper-accumulates endogenous auxin, indole-3-acetic acid (IAA). This is the first report of CNGC2 being potentially involved in auxin signals through auxin biosynthesis. I next showed that a loss-of-function of another IAA biosynthesis gene, TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS 1 (TAA1) also suppresses phenotypes associated with cngc2. This indicated that hyper-accumulation of IAA is a source of cngc2 phenotypes. IAA-induced Ca2+ influx is impaired in cngc2, and this phenotype is alleviated in the absence of YUC6. This indicates that CNGC2 functions in auxin-induced Ca2+ signals that can influence auxin homeostasis. The hyper accumulation of auxin in cngc2 positions CNGC2 in a negative feedback loop of auxin biosynthesis. Since all 11 members of the YUC gene family are thought to be involved in auxin biosynthesis, we asked whether a loss-of-function in any YUC gene could suppress cngc2 phenotype. Of all the yuc mutants tested, only yuc6 could suppress cngc2 phenotypes. YUC6 and TAA1 have been shown to exhibit similar tissue-specific expression patterns at the vasculature, a pattern not observed with other YUCs. This indicates a specific role of YUC6 in the CNGC2-mediated auxin feedback loop, which may be governed by its unique expression pattern. Collectively, these findings cast a new light of CNGC2’s complex regulation by auxin signaling and immune responses.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".