Subtopic Deep Dive
Rho GTPases in Cytokinesis
Research Guide
What is Rho GTPases in Cytokinesis?
Rho GTPases, particularly RhoA, regulate contractile ring assembly and furrow ingression during cytokinesis through microtubule-dependent activation zones.
RhoA signaling coordinates actomyosin contractility for cell division completion (Madaule et al., 1998; 392 citations). Microtubules position active RhoA zones essential for cleavage plane specification (Bement et al., 2005; 327 citations). Over 10 key papers from 1998-2014 detail Rho targets like citron kinase and links to cytokinesis failure.
Why It Matters
Rho GTPase dysregulation in cytokinesis causes centrosome amplification and tetraploidy, promoting tumorigenesis (Godinho and Pellman, 2014; 356 citations). Citron kinase as RhoA effector ensures contractile ring function; its loss leads to binucleation and cancer risks (Madaule et al., 1998). Asymmetric division via Rho signaling impacts stem cell maintenance and cancer stemness (Neumüller and Knoblich, 2009; 404 citations).
Key Research Challenges
Microtubule-RhoA Positioning
Defining how astral microtubules establish precise RhoA activation zones remains unclear (Bement et al., 2005). Central spindle signals must integrate with cortical cues for furrow specification. Live imaging reveals gaps in spatial-temporal dynamics (Fededa and Gerlich, 2012).
Rho Effector Integration
Linking RhoA to effectors like citron kinase requires better understanding of kinase-substrate interactions (Madaule et al., 1998). Aurora B relocation influences Rho signaling but mechanisms overlap incompletely (Grüneberg et al., 2004). Screens identify inhibitors yet pathways interconnect (Eggert et al., 2004).
Cytokinesis Failure Outcomes
Consequences of Rho defects, like tetraploidy, link to cancer but causal chains need clarification (Godinho and Pellman, 2014). Asymmetric division roles in stem cells complicate therapeutic targeting (Neumüller and Knoblich, 2009). Model systems like Drosophila highlight GEF requirements (Prokopenko et al., 1999).
Essential Papers
Dividing cellular asymmetry: asymmetric cell division and its implications for stem cells and cancer
Ralph A. Neumüller, Juergen A. Knoblich · 2009 · Genes & Development · 404 citations
Cell division is commonly thought to involve the equal distribution of cellular components into the two daughter cells. During many cell divisions, however, proteins, membrane compartments, organel...
The functional diversity of Aurora kinases: a comprehensive review
Estelle Willems, Matthias Dedobbeleer, Marina Digregorio et al. · 2018 · Cell Division · 402 citations
Role of citron kinase as a target of the small GTPase Rho in cytokinesis
Pascal Madaule, Masatoshi Eda, Naoki Watanabe et al. · 1998 · Nature · 392 citations
Causes and consequences of centrosome abnormalities in cancer
Susana A. Godinho, David Pellman · 2014 · Philosophical Transactions of the Royal Society B Biological Sciences · 356 citations
Centrosome amplification is a hallmark of cancer. However, despite significant progress in recent years, we are still far from understanding how centrosome amplification affects tumorigenesis. Bove...
Molecular control of animal cell cytokinesis
Juan Pablo Fededa, Daniel W. Gerlich · 2012 · Nature Cell Biology · 333 citations
Relocation of Aurora B from centromeres to the central spindle at the metaphase to anaphase transition requires MKlp2
Ulrike Grüneberg, Rüdiger Neef, Reiko Honda et al. · 2004 · The Journal of Cell Biology · 329 citations
Mitotic kinases of the Polo and Aurora families are key regulators of chromosome segregation and cytokinesis. Here, we have investigated the role of MKlp1 and MKlp2, two vertebrate mitotic kinesins...
A microtubule-dependent zone of active RhoA during cleavage plane specification
William M. Bement, Hélène A Benink, George von Dassow · 2005 · The Journal of Cell Biology · 327 citations
Cytokinesis in animal cells results from the assembly and constriction of a circumferential array of actin filaments and myosin-2. Microtubules of the mitotic apparatus determine the position at wh...
Reading Guide
Foundational Papers
Start with Madaule et al. (1998; 392 citations) for Rho-citron kinase mechanism, then Bement et al. (2005; 327 citations) for microtubule-RhoA zones, as they establish core signaling.
Recent Advances
Study Fededa and Gerlich (2012; 333 citations) for molecular controls; Godinho and Pellman (2014; 356 citations) for cancer links; Neumüller and Knoblich (2009; 404 citations) for asymmetry.
Core Methods
Key techniques: Fluorescence microscopy for Rho zones (Bement et al., 2005); chemical-genetic/RNai screens (Eggert et al., 2004); kinesin localization assays (Grüneberg et al., 2004).
How PapersFlow Helps You Research Rho GTPases in Cytokinesis
Discover & Search
Research Agent uses citationGraph on Madaule et al. (1998; 392 citations) to map Rho-cytokinesis networks, then findSimilarPapers uncovers related Rho effectors. exaSearch queries 'RhoA microtubule cytokinesis' across 250M+ OpenAlex papers for latest activators. searchPapers filters by 'Rho GTPase contractile ring' yielding 20+ hits like Bement et al. (2005).
Analyze & Verify
Analysis Agent runs readPaperContent on Bement et al. (2005) to extract RhoA zone data, then verifyResponse with CoVe cross-checks microtubule dependencies against Fededa and Gerlich (2012). runPythonAnalysis processes citation networks with pandas for Rho effector clustering. GRADE grading scores evidence strength on citron kinase claims (Madaule et al., 1998).
Synthesize & Write
Synthesis Agent detects gaps in RhoA-aurora integration from Grüneberg et al. (2004) and Godinho and Pellman (2014), flags contradictions in asymmetry models (Neumüller and Knoblich, 2009). Writing Agent applies latexEditText for figure legends, latexSyncCitations for 10-paper bibliography, and latexCompile for review manuscript. exportMermaid diagrams microtubule-Rho signaling pathways.
Use Cases
"Quantify RhoA activation zone widths from imaging data in cytokinesis papers"
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (NumPy image analysis on extracted figures from Bement et al., 2005) → matplotlib plots of zone statistics.
"Draft LaTeX review on Rho GTPases linking to cancer via cytokinesis failure"
Synthesis Agent → gap detection → Writing Agent → latexEditText (intro/methods) → latexSyncCitations (Madaule 1998, Godinho 2014) → latexCompile → PDF with furrow diagram.
"Find GitHub repos analyzing Rho GTPase screens from cytokinesis RNAi data"
Research Agent → searchPapers (Eggert et al., 2004) → Code Discovery → paperExtractUrls → paperFindGithubRepo → githubRepoInspect → R scripts for inhibitor target validation.
Automated Workflows
Deep Research workflow scans 50+ papers via searchPapers on 'Rho GTPases cytokinesis', structures report with GRADE-scored sections on effectors (Madaule et al., 1998). DeepScan applies 7-step CoVe to verify microtubule-Rho links from Bement et al. (2005), checkpointing with runPythonAnalysis. Theorizer generates hypotheses on Rho-asymmetry-cancer axis from Neumüller and Knoblich (2009).
Frequently Asked Questions
What defines Rho GTPases' role in cytokinesis?
RhoA activates via microtubule-positioned zones to assemble contractile rings with effectors like citron kinase (Madaule et al., 1998; Bement et al., 2005).
What methods study Rho GTPases in cytokinesis?
Live imaging tracks RhoA zones (Bement et al., 2005); RNAi screens identify targets (Eggert et al., 2004); Drosophila GEF mutants reveal initiation defects (Prokopenko et al., 1999).
What are key papers on this topic?
Foundational: Madaule et al. (1998; 392 citations) on citron kinase; Bement et al. (2005; 327 citations) on RhoA zones. High-impact: Neumüller and Knoblich (2009; 404 citations) on asymmetry.
What open problems exist?
Unresolved: Precise astral microtubule-RhoA signaling integration (Fededa and Gerlich, 2012); tetraploidy-tumorigenesis causality beyond centrosomes (Godinho and Pellman, 2014).
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