{"gene":"CDS1","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":1998,"finding":"Fission yeast Cds1 kinase is phosphorylated and activated specifically during S phase in response to DNA damage or replication arrest (hydroxyurea), but not during G1 or G2. Activation requires all six checkpoint Rad proteins, and Cds1 interacts physically with Rad26. Cds1 is required to slow S phase in the presence of DNA-damaging agents and defines an S-phase-specific subpathway of the checkpoint response.","method":"Genetic epistasis (checkpoint rad mutants), kinase activity assays, co-immunoprecipitation (Cds1-Rad26 interaction), cell-cycle-stage-specific activation experiments","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic and biochemical evidence, multiple orthogonal methods, independently replicated in subsequent studies","pmids":["9450932"],"is_preprint":false},{"year":1998,"finding":"In fission yeast, hydroxyurea-induced replication arrest stimulates Cds1 kinase, which phosphorylates Wee1 (an inhibitor of Cdc2) and is required for HU-induced increase in Mik1 (a second Cdc2 inhibitor). Cds1 and Chk1 jointly enforce the replication checkpoint; cds1 chk1 double mutants abolish HU-induced cell division arrest.","method":"Genetic epistasis (cds1 chk1 double mutants), kinase assays, western blotting for Mik1 levels","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double mutant rescue, kinase assays, replicated across multiple studies","pmids":["9572736"],"is_preprint":false},{"year":1998,"finding":"Fission yeast Cds1 and Chk1 both phosphorylate Cdc25 at serine residues 99, 192, and 359. Phosphorylation promotes Cdc25 binding to 14-3-3 proteins, preventing Cdc25 from activating Cdc2. Mutation of these residues reduces 14-3-3 binding in vitro and disrupts the replication checkpoint in vivo.","method":"In vitro kinase assays, mutagenesis of Cdc25 phosphorylation sites, 14-3-3 binding assays, in vivo checkpoint assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with mutagenesis, in vivo validation, replicated by multiple labs","pmids":["9774107"],"is_preprint":false},{"year":1999,"finding":"Human Cds1 (HuCds1/CHK2) is phosphorylated and activated in response to ionizing radiation in an ATM-dependent manner, and in response to hydroxyurea via an ATM-independent pathway. Like fission yeast Cds1, human Cds1 phosphorylates Cdc25C to promote 14-3-3 protein binding.","method":"In vitro kinase assay (Cdc25C phosphorylation), 14-3-3 binding assay, ATM-deficient cell lines, ionizing radiation and hydroxyurea treatment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (kinase assay, binding assay, genetic requirement for ATM), replicated by concurrent papers","pmids":["10097108"],"is_preprint":false},{"year":1999,"finding":"Human Cds1 directly phosphorylates and inactivates Cdc25 in vitro. Human Cds1 kinase activity is activated in response to ionizing radiation in an ATM- and wortmannin-sensitive manner.","method":"In vitro kinase assay, Cdc25 activity assay, wortmannin inhibition, ATM-deficient cells","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase reconstitution with Cdc25 substrate, multiple inhibitor controls, single lab","pmids":["9889122"],"is_preprint":false},{"year":1999,"finding":"Fission yeast Cds1 and Chk1 phosphorylate Cdc25 predominantly on serine-99 in vitro. Cds1 inhibits Cdc25-dependent activation of Cdc2 in vitro and contributes to mitotic delay in vivo. The Cdc25 S99A mutation partially impairs both S-M replication and G2-M damage checkpoints.","method":"In vitro kinase assay with phosphosite mapping, Cdc2 activation assay, in vivo checkpoint assay with S99A mutant","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, in vivo validation, consistent with parallel papers","pmids":["10198041"],"is_preprint":false},{"year":2000,"finding":"Human Cds1 (Chk2) phosphorylates p53 at multiple DNA damage-inducible sites in vitro, with preference for tetrameric over monomeric p53. Cds1 phosphorylates similar sites to Chk1 kinase.","method":"In vitro kinase assay with recombinant proteins, comparison of tetrameric vs. monomeric p53 substrates","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with defined substrates, replicated by concurrent study (PMID:11025670)","pmids":["10673501"],"is_preprint":false},{"year":2000,"finding":"Threonine 68 of human Cds1 (Chk2) is the preferred ATM phosphorylation site in vitro and is the principal irradiation-induced phosphorylation site in vivo. A T68A non-phosphorylatable mutant fails to be fully activated and has reduced ability to induce G1 arrest in response to ionizing radiation.","method":"In vitro phosphorylation assay (ATM on Cds1 T68), site-directed mutagenesis (T68A), in vivo phosphorylation mapping, G1 arrest assay","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay combined with mutagenesis and in vivo validation, multiple orthogonal methods","pmids":["11025670"],"is_preprint":false},{"year":2000,"finding":"The FHA1 domain of fission yeast Cds1 interacts with the damage tolerance protein Mus81. Mus81 has an XPF-like endonuclease domain and is required for survival of replicational stress, UV radiation, and DNA polymerase impairment. Genetic epistasis suggests Mus81 works with recombination enzymes and that Mus81 inactivation triggers a checkpoint-dependent mitotic delay.","method":"Co-immunoprecipitation (Cds1 FHA1 domain – Mus81), genetic epistasis, loss-of-function phenotypic analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — domain-specific interaction mapping, genetic epistasis, multiple phenotypic readouts","pmids":["11073977"],"is_preprint":false},{"year":1999,"finding":"Checkpoint signal specificity: Cds1 becomes more highly concentrated in the nucleus specifically during S phase, correlating with S-phase specificity of IR-induced Cds1 activation. Cds1 actively suppresses Chk1 phosphorylation in HU-arrested cells, suggesting Cds1 prevents a repair process that would lead to Chk1 activation.","method":"Subcellular fractionation/localization of Cds1, epistasis analysis with cds1 mutants, HU arrest and IR treatment combinations","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — localization by fractionation with functional correlation, genetic epistasis, single lab","pmids":["10330167"],"is_preprint":false},{"year":2001,"finding":"Fission yeast Mrc1 (mediator of replication checkpoint) associates with Cds1 and is required for Cds1 activation by Rad3. Mrc1 is cell-cycle-regulated, appearing coincident with S phase, and channels the replication arrest signal to Cds1.","method":"Co-immunoprecipitation (Mrc1-Cds1 interaction), kinase activation assays, mrc1 deletion phenotype analysis, mRNA/protein expression timing","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, kinase assay, cell cycle expression analysis, replicated and extended in subsequent papers","pmids":["11715017"],"is_preprint":false},{"year":2001,"finding":"Fission yeast Rad3 (ATR homolog) and human ATM phosphorylate the N-terminal domain of Cds1 at threonine-11 (T11Q motif) in vitro. T11A substitution abolishes Cds1 activation by hydroxyurea, prevents S-M checkpoint enforcement, and renders cells profoundly HU-sensitive.","method":"In vitro kinase assay (Rad3/ATM phosphorylation of Cds1), site-directed mutagenesis (T11A), HU sensitivity assay, checkpoint enforcement assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase reconstitution, mutagenesis, in vivo checkpoint validation, multiple orthogonal methods","pmids":["11313465"],"is_preprint":false},{"year":2003,"finding":"Fission yeast Swi1 (Tof1 homolog) is required for proficient activation of Cds1 at stalled replication forks. Swi1 and Cds1 together prevent fork collapse in rDNA repeats and at a hydroxyurea pause site. Swi1 is recruited to chromatin during S phase.","method":"Genetic epistasis (swi1 cds1 double mutants), Rad22 foci (marker of fork collapse), chromatin fractionation for Swi1 recruitment, Mus81 epistasis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple genetic and cell biological methods, chromatin recruitment assay, multiple phenotypic readouts","pmids":["14560029"],"is_preprint":false},{"year":2003,"finding":"Fission yeast Cds1 interacts with Rad60 (a recombinational repair protein). Cds1 activation triggers Rad60 phosphorylation and nuclear delocalization. A Rad60 mutant resistant to Cds1 regulation renders cells specifically sensitive to replication fork arrest. Rad60 functions codependently with the SMC5/6 complex.","method":"Co-immunoprecipitation (Cds1-Rad60), kinase assay, subcellular localization (nuclear delocalization), HU sensitivity assay with Rad60 mutant, mass spectrometry","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, kinase-substrate relationship, localization change with functional consequence, multiple orthogonal methods","pmids":["12897162"],"is_preprint":false},{"year":2004,"finding":"Mrc1 mediates initial Thr-11 phosphorylation of Cds1 by Rad3-Rad26 through specific interaction between phosphorylated Mrc1 and the FHA domain of Cds1 (demonstrated by yeast two-hybrid and FHA domain mutations). A Rad26-Cds1 fusion protein can bypass the requirement for Mrc1, indicating Mrc1 recruits Cds1 to Rad3-Rad26.","method":"Yeast two-hybrid (Mrc1-Cds1 FHA domain), FHA domain mutagenesis, Rad26-Cds1 fusion rescue, in vivo phosphorylation of T11","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — domain-specific interaction mapping, mutagenesis, fusion protein rescue, multiple orthogonal experiments","pmids":["15173168"],"is_preprint":false},{"year":2005,"finding":"Cds1 regulates Mus81 via its FHA domain. A mutation in the Mus81 FHA-binding motif eliminates Cds1 binding and Cds1-dependent phosphorylation of Mus81. Upon acute HU treatment, extensive Cds1-dependent phosphorylation of Mus81 causes its dissociation from chromatin, preventing cleavage of stalled replication forks.","method":"Co-immunoprecipitation (Cds1 FHA – Mus81 motif mutant), in vivo phosphorylation assay, chromatin fractionation, mutator phenotype assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-specific interaction with mutagenesis, chromatin fractionation showing localization change, genetic and biochemical orthogonal methods","pmids":["15805465"],"is_preprint":false},{"year":2006,"finding":"Cds1 activation occurs in two stages in fission yeast: (1) Mrc1 recruits Cds1 to stalled replication forks through interactions between the Cds1 FHA domain and Rad3-phosphorylated sites in Mrc1, followed by Rad3-dependent priming phosphorylation of Cds1; (2) primed Cds1 molecules dimerize via FHA domain phospho-specific interactions and are activated by autophosphorylation.","method":"Biochemical reconstitution, FHA domain interaction mapping, phosphorylation site analysis, dimerization assays, in vitro kinase assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mechanistic dissection of two-stage pathway, multiple biochemical methods","pmids":["16618806"],"is_preprint":false},{"year":2008,"finding":"Fission yeast Cds1 controls the release of the Cdc14-like phosphatase Flp1 from the nucleolus into the nucleus upon replication stress. Active Cds1 phosphorylates Flp1, and a Flp1 mutant lacking all Cds1 phosphorylation sites (flp1-9A) fails to relocate and shows checkpoint defects. Nuclear Flp1 in turn positively regulates full Cds1 activation (feedback loop).","method":"Subcellular localization by fluorescence microscopy, phosphorylation site mutagenesis (flp1-9A), kinase activity assays, Rad22 foci analysis","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct localization experiment linked to functional consequence, phospho-mutagenesis, kinase activity measurement, multiple methods","pmids":["18385517"],"is_preprint":false},{"year":2009,"finding":"Cds1 activation loop residue Thr-328 is the only covalent modification required for kinase activation in vitro and in vivo, achieved through trans-autophosphorylation upon dimerization. The C-terminal 27-amino acid tail of Cds1 acts as an autoinhibitory element that prevents spontaneous activation of unprimed monomeric Cds1.","method":"In vitro kinase assay with phosphosite mutagenesis, trans-autophosphorylation assays, truncation analysis of C-terminal tail","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution with mutagenesis, autoinhibition mechanism defined by truncation, single lab","pmids":["19357077"],"is_preprint":false},{"year":2009,"finding":"Fission yeast Cds1 phosphorylates APC/C activator Ste9 in vitro. At S-phase arrest, Cds1-dependent inhibition/phosphorylation of APC/C-Ste9 stabilizes the MBF activator Rep2 by preventing its ubiquitin-mediated proteolysis, thereby sustaining transcription of MBF-dependent genes needed for recovery.","method":"In vitro kinase assay (Cds1 phosphorylates Ste9), Rep2 ubiquitination assay, genetic analysis of Rep2 stability in cds1 mutants","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay with defined substrate, genetic epistasis, single lab with two orthogonal methods","pmids":["19596787"],"is_preprint":false},{"year":2000,"finding":"Xenopus Cds1 (Xcds1) is phosphorylated and activated by the presence of DNA molecules with double-stranded ends in cell-free egg extracts. This activation is distinct from Xchk1, which responds to DNA replication blocks but not double-stranded ends. Immunodepletion of Xcds1 did not attenuate cell cycle delay induced by double-stranded DNA ends.","method":"Cell-free Xenopus egg extract system, immunodepletion, kinase activation assays, aphidicolin vs. dsDNA end comparison","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-free reconstitution with immunodepletion, single lab, negative result for checkpoint delay role","pmids":["10793133"],"is_preprint":false},{"year":2004,"finding":"In Xenopus, XCds1 constitutively associates with a Xenopus ATR complex under normal conditions via a putative SH3-binding region (not requiring functional FHA domain). In response to double-stranded DNA ends, DNA-PK phosphorylates XCds1 at serine-39 first, followed by ATM/ATR/DNA-PK phosphorylation of SQ sites, promoting dissociation from ATR complex and full activation of XCds1.","method":"Co-immunoprecipitation (XCds1-ATR complex), domain mutagenesis (FHA, SH3-binding region), sequential phosphorylation mapping, kinase activation assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with domain mutants, sequential phosphorylation mapping, single lab, Xenopus system","pmids":["15509799"],"is_preprint":false},{"year":2001,"finding":"Xenopus Cds1 (XCds1) kinase activity is high in immature oocytes arrested at G2 and decreases at the meiotic G2/M transition. Overexpressed wild-type (but not kinase-deficient) XCds1 delays M-phase entry. XCds1 inactivation at G2/M depends on cyclin B-Cdc2 kinase activation, but XCds1 is not directly inactivated by Cdc2 in vitro.","method":"Kinase activity assays across oocyte maturation stages, overexpression of WT and kinase-dead XCds1, cyclin B overexpression, in vitro Cdc2 inactivation assay (negative result for direct inactivation)","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase activity assays across developmental stages, overexpression rescue, in vitro negative result, single lab","pmids":["11591827"],"is_preprint":false},{"year":2005,"finding":"Cds1 is required in fission yeast meiosis to suppress DNA double-strand break (DSB) formation when premeiotic S phase is inhibited by hydroxyurea. Cds1 deletion restores DSB formation in the presence of HU in rad3 mutant background. Cds1 is required for suppression of mei4+ transcription factor and cdc25+ phosphatase transcription in HU-arrested meiotic cells.","method":"Genetic analysis (cds1 deletion in meiosis), DSB detection (gel analysis), transcriptional analysis of mei4+ and cdc25+, HU treatment","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic analysis with defined molecular readouts, transcription analysis, single lab","pmids":["16286472"],"is_preprint":false},{"year":1996,"finding":"The S. cerevisiae CDS1 gene encodes CDP-diacylglycerol synthase, is essential for cell growth (null mutants cannot germinate or grow vegetatively), and accounts for the majority of CDP-diacylglycerol synthase activity in the cell. Overexpression elevates phosphatidylinositol synthesis relative to phosphatidylserine.","method":"Null mutant construction, GAL1-driven overexpression, enzyme activity assay (CDP-diacylglycerol synthase), phospholipid synthesis measurement","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzyme activity assay, null mutant lethality, overexpression biochemistry, multiple orthogonal methods","pmids":["8557688"],"is_preprint":false},{"year":2019,"finding":"In mammalian H9c2 cardiomyoblasts, vasopressin-induced sustained phospholipase C activation selectively increases CDS1 mRNA through a protein kinase C- and cFos-dependent pathway (AP-1 signaling). CDS1 and CDS2 are integral ER membrane proteins in mammalian cells; CDS1 upregulation provides a mechanism for maintaining phosphatidylinositol levels during prolonged PLC signaling.","method":"Pharmacological inhibition (PKC inhibitor, AP-1 inhibitor T-5224), qRT-PCR for CDS1 mRNA, western blot for cFos, vasopressin stimulation assay","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological pathway dissection with multiple inhibitors, mRNA and protein readouts, single lab","pmids":["30862571"],"is_preprint":false},{"year":2025,"finding":"CDS1 and CDS2 form a synthetic lethal pair in uveal melanoma: CDS2 is a genetic dependency specifically when CDS1 expression is low. CDS2 knockout disrupts phosphoinositide synthesis and increases cellular apoptosis; re-expression of CDS1 rescues the cell fitness defect, demonstrating functional redundancy between the two CDP-diacylglycerol synthase paralogs.","method":"CRISPR-Cas9 genome-wide and combinatorial paired-gene screens, in vivo validation, phosphoinositide synthesis measurement, CDS1 re-expression rescue","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR screening validated in vivo with biochemical rescue, multiple orthogonal methods, multiple cell models","pmids":["40615675"],"is_preprint":false},{"year":2025,"finding":"CDS1 catalyzes synthesis and secretion of CDP-diacylglycerol (CDP-DAG) in colorectal cancer cells. CDP-DAG binds transcription factor CEBPG and induces ferroptosis in myeloid-derived suppressor cells (MDSCs), relieving MDSC-mediated immunosuppression and enhancing cytotoxic T lymphocyte infiltration. CDP-DAG shows synergistic effects with anti-PDL1 therapy.","method":"In vitro and in vivo CDS1 loss-of-function models, MDSC ferroptosis assay, CEBPG binding assay, immune cell infiltration analysis, anti-PDL1 combination experiments","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo loss-of-function with multiple cellular readouts, binding assay for CEBPG, single lab","pmids":["41161459"],"is_preprint":false},{"year":2025,"finding":"CDS1 acts as a suppressor of nasopharyngeal carcinoma by decreasing intracellular lipid droplet formation. Restoring CDS1 expression suppresses NPC cell growth, migration, and invasion. CDS1 also promotes NF-κB pathway activation, increasing inflammatory cytokines and enhancing tumor immunogenicity in vivo.","method":"CDS1 re-expression in NPC cells, lipid droplet quantification, colony formation and invasion assays, in vivo tumor model, NF-κB pathway analysis","journal":"Cell adhesion & migration","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function with in vivo validation and multiple cellular readouts, single lab","pmids":["40566856"],"is_preprint":false},{"year":2025,"finding":"CDS1 downregulation in asthmatic epithelium results in decreased synthesis of phosphatidylinositol (PI) and PI(4,5)P2, suppressing PI3K/AKT signaling. CDS1 overexpression reverses the protective effects of bacterial cellulose on asthma in vivo, confirming CDS1 as a key node linking CDP-diacylglycerol/phosphoinositide metabolism to PI3K/AKT pathway activity.","method":"BALF metabolomics, single-cell RNA sequencing, CDS1 overexpression in vivo (mouse asthma model), PI and PIP2 measurement, PI3K/AKT pathway readouts","journal":"International journal of biological macromolecules","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo overexpression rescue with lipid metabolomics and signaling pathway readouts, single lab","pmids":["41407218"],"is_preprint":false}],"current_model":"CDS1 (CDP-diacylglycerol synthase 1) encodes an essential integral ER membrane enzyme that converts phosphatidic acid to CDP-diacylglycerol, serving as the rate-limiting step for phosphatidylinositol and phosphoinositide resynthesis; in the context of checkpoint biology, the fission yeast and human orthologs (SpCds1/hCds1/CHK2) are serine/threonine kinases activated in a two-stage mechanism involving Mrc1-dependent recruitment to stalled replication forks, Rad3/ATM-dependent priming phosphorylation (T11 in SpCds1; T68 in hCds1), FHA-domain-mediated dimerization, and trans-autophosphorylation of the activation loop (T328), whereupon activated Cds1 phosphorylates and inhibits Cdc25, phosphorylates Wee1, stabilizes Mik1, regulates Mus81 endonuclease chromatin association, and phosphorylates p53, thereby enforcing the S-M replication checkpoint and coordinating DNA repair; in mammalian cells, the CDS1 lipid enzyme function is regulated through PKC/cFos signaling downstream of PLC activation and is synthetically lethal with CDS2 when CDS1 expression is low, with the CDS1/CDP-DAG axis also modulating tumor immunity through MDSC ferroptosis."},"narrative":{"mechanistic_narrative":"The CDS1 symbol in this corpus resolves to two mechanistically distinct proteins. The dominant body of evidence describes a checkpoint serine/threonine kinase (the fission yeast Cds1 and its human ortholog HuCds1/CHK2) that enforces the S-phase replication checkpoint in response to DNA damage and replication arrest [PMID:9450932, PMID:10097108]. This kinase is activated in a two-stage mechanism: the replication mediator Mrc1 recruits Cds1 to stalled forks through phospho-dependent interactions between Rad3-phosphorylated Mrc1 and the Cds1 FHA domain, enabling Rad3/ATM-dependent priming phosphorylation (Thr-11 in fission yeast, Thr-68 in human Cds1), after which primed molecules dimerize via the FHA domain and activate by trans-autophosphorylation of activation-loop residue Thr-328, with the C-terminal tail acting as an autoinhibitory element on unprimed monomers [PMID:11025670, PMID:11313465, PMID:15173168, PMID:16618806, PMID:19357077]. Activated Cds1 phosphorylates Cdc25 on multiple serines to promote 14-3-3 binding and block Cdc2 activation, phosphorylates the Cdc2 inhibitor Wee1 and stabilizes Mik1, and phosphorylates p53 at DNA-damage-inducible sites, thereby coupling fork arrest to cell-cycle delay [PMID:9572736, PMID:9774107, PMID:10673501]. At the fork, Cds1 controls genome stability by FHA-dependent phosphorylation of the Mus81 endonuclease, driving its dissociation from chromatin to prevent cleavage of stalled forks, and by regulating the repair proteins Rad60 and the phosphatase Flp1 [PMID:15805465, PMID:12897162, PMID:18385517]. A separate, biochemically unrelated set of findings identifies CDS1 as an essential integral ER-membrane CDP-diacylglycerol synthase that converts phosphatidic acid to CDP-diacylglycerol for phosphatidylinositol and phosphoinositide synthesis [PMID:8557688]. In mammalian cells this lipid enzyme is transcriptionally induced by sustained PLC/PKC/cFos signaling, is synthetically lethal with its paralog CDS2, and the CDS1/CDP-DAG axis modulates phosphoinositide-dependent signaling and tumor biology [PMID:30862571, PMID:40615675, PMID:41407218]. Because the kinase findings and the lipid-synthase findings describe fundamentally distinct activities, they are reported separately and not as one protein.","teleology":[{"year":1998,"claim":"Established that Cds1 is a checkpoint kinase activated specifically during S phase, defining an S-phase-specific arm of the DNA damage/replication checkpoint distinct from the general checkpoint response.","evidence":"Genetic epistasis with checkpoint rad mutants, kinase assays, and Cds1-Rad26 co-IP in fission yeast","pmids":["9450932"],"confidence":"High","gaps":["Did not define direct substrates","Did not resolve how the S-phase signal reaches Cds1"]},{"year":1998,"claim":"Identified the downstream effectors linking Cds1 to mitotic inhibition, showing it acts through Wee1, Mik1, and Cdc25 to restrain Cdc2.","evidence":"Genetic epistasis (cds1 chk1 double mutants), kinase assays, Wee1/Cdc25 phosphosite mapping and 14-3-3 binding assays in fission yeast","pmids":["9572736","9774107"],"confidence":"High","gaps":["Did not establish the upstream Cds1 activation mechanism","Relative contribution of each effector to arrest unresolved"]},{"year":1999,"claim":"Demonstrated that the human ortholog HuCds1/CHK2 conserves the checkpoint function, responding to ionizing radiation in an ATM-dependent manner and to hydroxyurea ATM-independently, and phosphorylating Cdc25C.","evidence":"In vitro kinase assays on Cdc25C, 14-3-3 binding assays, ATM-deficient cell lines with IR and HU treatment","pmids":["10097108","9889122"],"confidence":"High","gaps":["Priming phosphorylation site not yet identified","Mechanism of FHA-mediated activation not addressed"]},{"year":2000,"claim":"Defined the ATM priming site Thr-68 on human Cds1 and identified p53 as a substrate, linking the kinase to G1 arrest and the p53 damage response.","evidence":"In vitro ATM phosphorylation of T68, T68A mutagenesis with G1 arrest assays, and in vitro p53 phosphorylation comparing tetrameric vs monomeric substrate","pmids":["11025670","10673501"],"confidence":"High","gaps":["Did not address the activation-loop autophosphorylation step","In vivo significance of p53 phosphorylation not quantified"]},{"year":2001,"claim":"Identified the fission yeast priming site Thr-11 and established Mrc1 as the mediator that channels the replication-arrest signal from Rad3 to Cds1.","evidence":"In vitro Rad3/ATM kinase assays on Cds1 T11, T11A mutagenesis with HU-sensitivity and checkpoint assays, and Mrc1-Cds1 co-IP with mrc1 deletion analysis","pmids":["11313465","11715017"],"confidence":"High","gaps":["Did not define how Mrc1 physically engages Cds1","Activation-loop and dimerization steps still open"]},{"year":2003,"claim":"Linked Cds1 to fork stabilization and recombinational repair through the fork-protection factor Swi1 and the repair protein Rad60.","evidence":"Genetic epistasis (swi1 cds1), Rad22 foci, chromatin fractionation, and Cds1-Rad60 co-IP with kinase and localization assays in fission yeast","pmids":["14560029","12897162"],"confidence":"High","gaps":["Did not establish direct biochemical hierarchy among fork factors","Functional consequence of Rad60 delocalization on repair outcome incompletely defined"]},{"year":2004,"claim":"Resolved the recruitment mechanism, showing phosphorylated Mrc1 engages the Cds1 FHA domain to enable Rad3-Rad26-dependent Thr-11 priming, bypassable by a Rad26-Cds1 fusion.","evidence":"Yeast two-hybrid, FHA domain mutagenesis, Rad26-Cds1 fusion rescue, and in vivo T11 phosphorylation in fission yeast","pmids":["15173168"],"confidence":"High","gaps":["Did not define the dimerization/autoactivation step","Stoichiometry of the recruitment complex unresolved"]},{"year":2005,"claim":"Defined how Cds1 protects stalled forks, showing FHA-dependent phosphorylation of Mus81 drives its dissociation from chromatin to prevent endonucleolytic cleavage.","evidence":"FHA-binding-motif mutant co-IP, in vivo phosphorylation, chromatin fractionation, and mutator phenotype assays in fission yeast","pmids":["15805465","11073977"],"confidence":"High","gaps":["Did not quantify fork restart kinetics after Mus81 removal","Whether other nucleases are similarly regulated unknown"]},{"year":2006,"claim":"Assembled the complete two-stage activation model: Mrc1-FHA recruitment plus Rad3 priming, then phospho-FHA-mediated dimerization and autophosphorylation.","evidence":"Biochemical reconstitution with FHA interaction mapping, phosphosite analysis, dimerization and in vitro kinase assays","pmids":["16618806"],"confidence":"High","gaps":["Did not pinpoint the single residue sufficient for catalytic activation","Structural basis of FHA dimer not resolved"]},{"year":2009,"claim":"Identified the activation-loop residue Thr-328 as the sole modification required for catalysis and defined the C-terminal tail as an autoinhibitory element.","evidence":"In vitro kinase assays with phosphosite mutagenesis, trans-autophosphorylation assays, and C-terminal truncation analysis","pmids":["19357077","19596787"],"confidence":"High","gaps":["Structural mechanism of tail-mediated autoinhibition not solved","Conservation of T328 regulation in human CHK2 not addressed here"]},{"year":2000,"claim":"Extended Cds1 checkpoint signaling to vertebrates, showing Xenopus Cds1 responds selectively to double-stranded DNA ends and constitutively associates with an ATR complex regulated by DNA-PK-primed phosphorylation.","evidence":"Cell-free egg extracts with immunodepletion, XCds1-ATR co-IP, domain mutagenesis, and sequential phosphorylation mapping","pmids":["10793133","15509799","11591827"],"confidence":"Medium","gaps":["Negative result for checkpoint delay leaves XCds1's effector role unclear","SH3-binding-region engagement mapped indirectly"]},{"year":1996,"claim":"Established the unrelated CDS1 lipid-enzyme identity: an essential CDP-diacylglycerol synthase providing the bulk of cellular activity and controlling the balance of phosphatidylinositol synthesis.","evidence":"Null-mutant lethality, GAL1-driven overexpression, in vitro CDP-DAG synthase activity assays, and phospholipid measurement in S. cerevisiae","pmids":["8557688"],"confidence":"High","gaps":["No structural or catalytic-mechanism detail","Relationship to the kinase-named Cds1 is none — distinct protein"]},{"year":2025,"claim":"Established the mammalian CDS1 lipid enzyme as a paralog-redundant, signaling-regulated node, synthetically lethal with CDS2 and modulating phosphoinositide-dependent pathways and tumor biology.","evidence":"PLC/PKC/cFos pharmacological dissection with qRT-PCR; CRISPR paired-gene screens with CDS1 re-expression rescue; in vivo lipid and PI3K/AKT readouts in cancer and asthma models","pmids":["30862571","40615675","41161459","40566856","41407218"],"confidence":"Medium","gaps":["Direct enzymatic kinetics of human CDS1 not measured here","Mechanistic link from CDP-DAG to downstream phenotypes incompletely defined","Tissue-specific contributions of CDS1 vs CDS2 not fully resolved"]},{"year":null,"claim":"It remains unresolved how the two distinct CDS1 activities (checkpoint kinase versus CDP-diacylglycerol synthase) relate in this corpus, and whether the human kinase activation mechanism mirrors the dissected fission yeast pathway in full.","evidence":"","pmids":[],"confidence":"Low","gaps":["No discovery reconciles the kinase and lipid-synthase identities","Human CHK2 activation-loop and autoinhibition steps not directly tested in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,2,6,15,16,18]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,3,18]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[24,26]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[24]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,17]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[17]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[24,25]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,1,2,7]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[8,13,15]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[10,12,16]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[24,25,26]}],"complexes":[],"partners":["MRC1","RAD26","MUS81","RAD60","CDC25","CDS2","CEBPG"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O96017","full_name":"Serine/threonine-protein kinase Chk2","aliases":["CHK2 checkpoint homolog","Cds1 homolog","Hucds1","hCds1","Checkpoint kinase 2"],"length_aa":543,"mass_kda":60.9,"function":"Serine/threonine-protein kinase which is required for checkpoint-mediated cell cycle arrest, activation of DNA repair and apoptosis in response to the presence of DNA double-strand breaks. May also negatively regulate cell cycle progression during unperturbed cell cycles. Following activation, phosphorylates numerous effectors preferentially at the consensus sequence [L-X-R-X-X-S/T] (PubMed:37943659). Regulates cell cycle checkpoint arrest through phosphorylation of CDC25A, CDC25B and CDC25C, inhibiting their activity. Inhibition of CDC25 phosphatase activity leads to increased inhibitory tyrosine phosphorylation of CDK-cyclin complexes and blocks cell cycle progression. May also phosphorylate NEK6 which is involved in G2/M cell cycle arrest. Regulates DNA repair through phosphorylation of BRCA2, enhancing the association of RAD51 with chromatin which promotes DNA repair by homologous recombination. Also stimulates the transcription of genes involved in DNA repair (including BRCA2) through the phosphorylation and activation of the transcription factor FOXM1. Regulates apoptosis through the phosphorylation of p53/TP53, MDM4 and PML. Phosphorylation of p53/TP53 at 'Ser-20' by CHEK2 may alleviate inhibition by MDM2, leading to accumulation of active p53/TP53. Phosphorylation of MDM4 may also reduce degradation of p53/TP53. Also controls the transcription of pro-apoptotic genes through phosphorylation of the transcription factor E2F1. Tumor suppressor, it may also have a DNA damage-independent function in mitotic spindle assembly by phosphorylating BRCA1. Its absence may be a cause of the chromosomal instability observed in some cancer cells. Promotes the CCAR2-SIRT1 association and is required for CCAR2-mediated SIRT1 inhibition (PubMed:25361978). Under oxidative stress, promotes ATG7 ubiquitination by phosphorylating the E3 ubiquitin ligase TRIM32 at 'Ser-55' leading to positive regulation of the autophagosme assembly (PubMed:37943659) (Microbial infection) Phosphorylates herpes simplex virus 1/HHV-1 protein ICP0 and thus activates its SUMO-targeted ubiquitin ligase activity","subcellular_location":"Nucleus, PML body; Nucleus, nucleoplasm","url":"https://www.uniprot.org/uniprotkb/O96017/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CDS1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000163624","cell_line_id":"CID000344","localizations":[{"compartment":"er","grade":3}],"interactors":[{"gene":"CDS2","stoichiometry":10.0},{"gene":"FASN","stoichiometry":0.2},{"gene":"ALDH3A2","stoichiometry":0.2},{"gene":"NSDHL","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000344","total_profiled":1310},"omim":[{"mim_id":"609265","title":"TUMOR PREDISPOSITION SYNDROME 4; TPDS4","url":"https://www.omim.org/entry/609265"},{"mim_id":"605893","title":"CDP-DIACYLGLYCEROL-INOSITOL 3-PHOSPHATIDYLTRANSFERASE; CDIPT","url":"https://www.omim.org/entry/605893"},{"mim_id":"604373","title":"CHECKPOINT KINASE 2; CHEK2","url":"https://www.omim.org/entry/604373"},{"mim_id":"603549","title":"CDP-DIACYLGLYCEROL SYNTHASE 2; CDS2","url":"https://www.omim.org/entry/603549"},{"mim_id":"603548","title":"CDP-DIACYLGLYCEROL SYNTHASE 1; CDS1","url":"https://www.omim.org/entry/603548"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CDS1"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O96017","domains":[{"cath_id":"2.60.200.20","chopping":"93-202","consensus_level":"high","plddt":92.3037,"start":93,"end":202},{"cath_id":"3.30.200.20","chopping":"213-301","consensus_level":"high","plddt":80.6565,"start":213,"end":301},{"cath_id":"1.10.510.10","chopping":"306-497","consensus_level":"high","plddt":88.1994,"start":306,"end":497}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O96017","model_url":"https://alphafold.ebi.ac.uk/files/AF-O96017-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O96017-F1-predicted_aligned_error_v6.png","plddt_mean":76.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CDS1","jax_strain_url":"https://www.jax.org/strain/search?query=CDS1"},"sequence":{"accession":"O96017","fasta_url":"https://rest.uniprot.org/uniprotkb/O96017.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O96017/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O96017"}},"corpus_meta":[{"pmid":"10673501","id":"PMC_10673501","title":"The 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Activation requires all six checkpoint Rad proteins, and Cds1 interacts physically with Rad26. Cds1 is required to slow S phase in the presence of DNA-damaging agents and defines an S-phase-specific subpathway of the checkpoint response.\",\n      \"method\": \"Genetic epistasis (checkpoint rad mutants), kinase activity assays, co-immunoprecipitation (Cds1-Rad26 interaction), cell-cycle-stage-specific activation experiments\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic and biochemical evidence, multiple orthogonal methods, independently replicated in subsequent studies\",\n      \"pmids\": [\"9450932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"In fission yeast, hydroxyurea-induced replication arrest stimulates Cds1 kinase, which phosphorylates Wee1 (an inhibitor of Cdc2) and is required for HU-induced increase in Mik1 (a second Cdc2 inhibitor). Cds1 and Chk1 jointly enforce the replication checkpoint; cds1 chk1 double mutants abolish HU-induced cell division arrest.\",\n      \"method\": \"Genetic epistasis (cds1 chk1 double mutants), kinase assays, western blotting for Mik1 levels\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double mutant rescue, kinase assays, replicated across multiple studies\",\n      \"pmids\": [\"9572736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Fission yeast Cds1 and Chk1 both phosphorylate Cdc25 at serine residues 99, 192, and 359. Phosphorylation promotes Cdc25 binding to 14-3-3 proteins, preventing Cdc25 from activating Cdc2. Mutation of these residues reduces 14-3-3 binding in vitro and disrupts the replication checkpoint in vivo.\",\n      \"method\": \"In vitro kinase assays, mutagenesis of Cdc25 phosphorylation sites, 14-3-3 binding assays, in vivo checkpoint assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with mutagenesis, in vivo validation, replicated by multiple labs\",\n      \"pmids\": [\"9774107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Human Cds1 (HuCds1/CHK2) is phosphorylated and activated in response to ionizing radiation in an ATM-dependent manner, and in response to hydroxyurea via an ATM-independent pathway. Like fission yeast Cds1, human Cds1 phosphorylates Cdc25C to promote 14-3-3 protein binding.\",\n      \"method\": \"In vitro kinase assay (Cdc25C phosphorylation), 14-3-3 binding assay, ATM-deficient cell lines, ionizing radiation and hydroxyurea treatment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (kinase assay, binding assay, genetic requirement for ATM), replicated by concurrent papers\",\n      \"pmids\": [\"10097108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Human Cds1 directly phosphorylates and inactivates Cdc25 in vitro. Human Cds1 kinase activity is activated in response to ionizing radiation in an ATM- and wortmannin-sensitive manner.\",\n      \"method\": \"In vitro kinase assay, Cdc25 activity assay, wortmannin inhibition, ATM-deficient cells\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase reconstitution with Cdc25 substrate, multiple inhibitor controls, single lab\",\n      \"pmids\": [\"9889122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Fission yeast Cds1 and Chk1 phosphorylate Cdc25 predominantly on serine-99 in vitro. Cds1 inhibits Cdc25-dependent activation of Cdc2 in vitro and contributes to mitotic delay in vivo. The Cdc25 S99A mutation partially impairs both S-M replication and G2-M damage checkpoints.\",\n      \"method\": \"In vitro kinase assay with phosphosite mapping, Cdc2 activation assay, in vivo checkpoint assay with S99A mutant\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis, in vivo validation, consistent with parallel papers\",\n      \"pmids\": [\"10198041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Human Cds1 (Chk2) phosphorylates p53 at multiple DNA damage-inducible sites in vitro, with preference for tetrameric over monomeric p53. Cds1 phosphorylates similar sites to Chk1 kinase.\",\n      \"method\": \"In vitro kinase assay with recombinant proteins, comparison of tetrameric vs. monomeric p53 substrates\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with defined substrates, replicated by concurrent study (PMID:11025670)\",\n      \"pmids\": [\"10673501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Threonine 68 of human Cds1 (Chk2) is the preferred ATM phosphorylation site in vitro and is the principal irradiation-induced phosphorylation site in vivo. A T68A non-phosphorylatable mutant fails to be fully activated and has reduced ability to induce G1 arrest in response to ionizing radiation.\",\n      \"method\": \"In vitro phosphorylation assay (ATM on Cds1 T68), site-directed mutagenesis (T68A), in vivo phosphorylation mapping, G1 arrest assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay combined with mutagenesis and in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"11025670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The FHA1 domain of fission yeast Cds1 interacts with the damage tolerance protein Mus81. Mus81 has an XPF-like endonuclease domain and is required for survival of replicational stress, UV radiation, and DNA polymerase impairment. Genetic epistasis suggests Mus81 works with recombination enzymes and that Mus81 inactivation triggers a checkpoint-dependent mitotic delay.\",\n      \"method\": \"Co-immunoprecipitation (Cds1 FHA1 domain – Mus81), genetic epistasis, loss-of-function phenotypic analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific interaction mapping, genetic epistasis, multiple phenotypic readouts\",\n      \"pmids\": [\"11073977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Checkpoint signal specificity: Cds1 becomes more highly concentrated in the nucleus specifically during S phase, correlating with S-phase specificity of IR-induced Cds1 activation. Cds1 actively suppresses Chk1 phosphorylation in HU-arrested cells, suggesting Cds1 prevents a repair process that would lead to Chk1 activation.\",\n      \"method\": \"Subcellular fractionation/localization of Cds1, epistasis analysis with cds1 mutants, HU arrest and IR treatment combinations\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — localization by fractionation with functional correlation, genetic epistasis, single lab\",\n      \"pmids\": [\"10330167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Fission yeast Mrc1 (mediator of replication checkpoint) associates with Cds1 and is required for Cds1 activation by Rad3. Mrc1 is cell-cycle-regulated, appearing coincident with S phase, and channels the replication arrest signal to Cds1.\",\n      \"method\": \"Co-immunoprecipitation (Mrc1-Cds1 interaction), kinase activation assays, mrc1 deletion phenotype analysis, mRNA/protein expression timing\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, kinase assay, cell cycle expression analysis, replicated and extended in subsequent papers\",\n      \"pmids\": [\"11715017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Fission yeast Rad3 (ATR homolog) and human ATM phosphorylate the N-terminal domain of Cds1 at threonine-11 (T11Q motif) in vitro. T11A substitution abolishes Cds1 activation by hydroxyurea, prevents S-M checkpoint enforcement, and renders cells profoundly HU-sensitive.\",\n      \"method\": \"In vitro kinase assay (Rad3/ATM phosphorylation of Cds1), site-directed mutagenesis (T11A), HU sensitivity assay, checkpoint enforcement assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase reconstitution, mutagenesis, in vivo checkpoint validation, multiple orthogonal methods\",\n      \"pmids\": [\"11313465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Fission yeast Swi1 (Tof1 homolog) is required for proficient activation of Cds1 at stalled replication forks. Swi1 and Cds1 together prevent fork collapse in rDNA repeats and at a hydroxyurea pause site. Swi1 is recruited to chromatin during S phase.\",\n      \"method\": \"Genetic epistasis (swi1 cds1 double mutants), Rad22 foci (marker of fork collapse), chromatin fractionation for Swi1 recruitment, Mus81 epistasis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic and cell biological methods, chromatin recruitment assay, multiple phenotypic readouts\",\n      \"pmids\": [\"14560029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Fission yeast Cds1 interacts with Rad60 (a recombinational repair protein). Cds1 activation triggers Rad60 phosphorylation and nuclear delocalization. A Rad60 mutant resistant to Cds1 regulation renders cells specifically sensitive to replication fork arrest. Rad60 functions codependently with the SMC5/6 complex.\",\n      \"method\": \"Co-immunoprecipitation (Cds1-Rad60), kinase assay, subcellular localization (nuclear delocalization), HU sensitivity assay with Rad60 mutant, mass spectrometry\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, kinase-substrate relationship, localization change with functional consequence, multiple orthogonal methods\",\n      \"pmids\": [\"12897162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Mrc1 mediates initial Thr-11 phosphorylation of Cds1 by Rad3-Rad26 through specific interaction between phosphorylated Mrc1 and the FHA domain of Cds1 (demonstrated by yeast two-hybrid and FHA domain mutations). A Rad26-Cds1 fusion protein can bypass the requirement for Mrc1, indicating Mrc1 recruits Cds1 to Rad3-Rad26.\",\n      \"method\": \"Yeast two-hybrid (Mrc1-Cds1 FHA domain), FHA domain mutagenesis, Rad26-Cds1 fusion rescue, in vivo phosphorylation of T11\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific interaction mapping, mutagenesis, fusion protein rescue, multiple orthogonal experiments\",\n      \"pmids\": [\"15173168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cds1 regulates Mus81 via its FHA domain. A mutation in the Mus81 FHA-binding motif eliminates Cds1 binding and Cds1-dependent phosphorylation of Mus81. Upon acute HU treatment, extensive Cds1-dependent phosphorylation of Mus81 causes its dissociation from chromatin, preventing cleavage of stalled replication forks.\",\n      \"method\": \"Co-immunoprecipitation (Cds1 FHA – Mus81 motif mutant), in vivo phosphorylation assay, chromatin fractionation, mutator phenotype assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-specific interaction with mutagenesis, chromatin fractionation showing localization change, genetic and biochemical orthogonal methods\",\n      \"pmids\": [\"15805465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Cds1 activation occurs in two stages in fission yeast: (1) Mrc1 recruits Cds1 to stalled replication forks through interactions between the Cds1 FHA domain and Rad3-phosphorylated sites in Mrc1, followed by Rad3-dependent priming phosphorylation of Cds1; (2) primed Cds1 molecules dimerize via FHA domain phospho-specific interactions and are activated by autophosphorylation.\",\n      \"method\": \"Biochemical reconstitution, FHA domain interaction mapping, phosphorylation site analysis, dimerization assays, in vitro kinase assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mechanistic dissection of two-stage pathway, multiple biochemical methods\",\n      \"pmids\": [\"16618806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Fission yeast Cds1 controls the release of the Cdc14-like phosphatase Flp1 from the nucleolus into the nucleus upon replication stress. Active Cds1 phosphorylates Flp1, and a Flp1 mutant lacking all Cds1 phosphorylation sites (flp1-9A) fails to relocate and shows checkpoint defects. Nuclear Flp1 in turn positively regulates full Cds1 activation (feedback loop).\",\n      \"method\": \"Subcellular localization by fluorescence microscopy, phosphorylation site mutagenesis (flp1-9A), kinase activity assays, Rad22 foci analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment linked to functional consequence, phospho-mutagenesis, kinase activity measurement, multiple methods\",\n      \"pmids\": [\"18385517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Cds1 activation loop residue Thr-328 is the only covalent modification required for kinase activation in vitro and in vivo, achieved through trans-autophosphorylation upon dimerization. The C-terminal 27-amino acid tail of Cds1 acts as an autoinhibitory element that prevents spontaneous activation of unprimed monomeric Cds1.\",\n      \"method\": \"In vitro kinase assay with phosphosite mutagenesis, trans-autophosphorylation assays, truncation analysis of C-terminal tail\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution with mutagenesis, autoinhibition mechanism defined by truncation, single lab\",\n      \"pmids\": [\"19357077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Fission yeast Cds1 phosphorylates APC/C activator Ste9 in vitro. At S-phase arrest, Cds1-dependent inhibition/phosphorylation of APC/C-Ste9 stabilizes the MBF activator Rep2 by preventing its ubiquitin-mediated proteolysis, thereby sustaining transcription of MBF-dependent genes needed for recovery.\",\n      \"method\": \"In vitro kinase assay (Cds1 phosphorylates Ste9), Rep2 ubiquitination assay, genetic analysis of Rep2 stability in cds1 mutants\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay with defined substrate, genetic epistasis, single lab with two orthogonal methods\",\n      \"pmids\": [\"19596787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Xenopus Cds1 (Xcds1) is phosphorylated and activated by the presence of DNA molecules with double-stranded ends in cell-free egg extracts. This activation is distinct from Xchk1, which responds to DNA replication blocks but not double-stranded ends. Immunodepletion of Xcds1 did not attenuate cell cycle delay induced by double-stranded DNA ends.\",\n      \"method\": \"Cell-free Xenopus egg extract system, immunodepletion, kinase activation assays, aphidicolin vs. dsDNA end comparison\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-free reconstitution with immunodepletion, single lab, negative result for checkpoint delay role\",\n      \"pmids\": [\"10793133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In Xenopus, XCds1 constitutively associates with a Xenopus ATR complex under normal conditions via a putative SH3-binding region (not requiring functional FHA domain). In response to double-stranded DNA ends, DNA-PK phosphorylates XCds1 at serine-39 first, followed by ATM/ATR/DNA-PK phosphorylation of SQ sites, promoting dissociation from ATR complex and full activation of XCds1.\",\n      \"method\": \"Co-immunoprecipitation (XCds1-ATR complex), domain mutagenesis (FHA, SH3-binding region), sequential phosphorylation mapping, kinase activation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with domain mutants, sequential phosphorylation mapping, single lab, Xenopus system\",\n      \"pmids\": [\"15509799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Xenopus Cds1 (XCds1) kinase activity is high in immature oocytes arrested at G2 and decreases at the meiotic G2/M transition. Overexpressed wild-type (but not kinase-deficient) XCds1 delays M-phase entry. XCds1 inactivation at G2/M depends on cyclin B-Cdc2 kinase activation, but XCds1 is not directly inactivated by Cdc2 in vitro.\",\n      \"method\": \"Kinase activity assays across oocyte maturation stages, overexpression of WT and kinase-dead XCds1, cyclin B overexpression, in vitro Cdc2 inactivation assay (negative result for direct inactivation)\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase activity assays across developmental stages, overexpression rescue, in vitro negative result, single lab\",\n      \"pmids\": [\"11591827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cds1 is required in fission yeast meiosis to suppress DNA double-strand break (DSB) formation when premeiotic S phase is inhibited by hydroxyurea. Cds1 deletion restores DSB formation in the presence of HU in rad3 mutant background. Cds1 is required for suppression of mei4+ transcription factor and cdc25+ phosphatase transcription in HU-arrested meiotic cells.\",\n      \"method\": \"Genetic analysis (cds1 deletion in meiosis), DSB detection (gel analysis), transcriptional analysis of mei4+ and cdc25+, HU treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic analysis with defined molecular readouts, transcription analysis, single lab\",\n      \"pmids\": [\"16286472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The S. cerevisiae CDS1 gene encodes CDP-diacylglycerol synthase, is essential for cell growth (null mutants cannot germinate or grow vegetatively), and accounts for the majority of CDP-diacylglycerol synthase activity in the cell. Overexpression elevates phosphatidylinositol synthesis relative to phosphatidylserine.\",\n      \"method\": \"Null mutant construction, GAL1-driven overexpression, enzyme activity assay (CDP-diacylglycerol synthase), phospholipid synthesis measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzyme activity assay, null mutant lethality, overexpression biochemistry, multiple orthogonal methods\",\n      \"pmids\": [\"8557688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In mammalian H9c2 cardiomyoblasts, vasopressin-induced sustained phospholipase C activation selectively increases CDS1 mRNA through a protein kinase C- and cFos-dependent pathway (AP-1 signaling). CDS1 and CDS2 are integral ER membrane proteins in mammalian cells; CDS1 upregulation provides a mechanism for maintaining phosphatidylinositol levels during prolonged PLC signaling.\",\n      \"method\": \"Pharmacological inhibition (PKC inhibitor, AP-1 inhibitor T-5224), qRT-PCR for CDS1 mRNA, western blot for cFos, vasopressin stimulation assay\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological pathway dissection with multiple inhibitors, mRNA and protein readouts, single lab\",\n      \"pmids\": [\"30862571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CDS1 and CDS2 form a synthetic lethal pair in uveal melanoma: CDS2 is a genetic dependency specifically when CDS1 expression is low. CDS2 knockout disrupts phosphoinositide synthesis and increases cellular apoptosis; re-expression of CDS1 rescues the cell fitness defect, demonstrating functional redundancy between the two CDP-diacylglycerol synthase paralogs.\",\n      \"method\": \"CRISPR-Cas9 genome-wide and combinatorial paired-gene screens, in vivo validation, phosphoinositide synthesis measurement, CDS1 re-expression rescue\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR screening validated in vivo with biochemical rescue, multiple orthogonal methods, multiple cell models\",\n      \"pmids\": [\"40615675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CDS1 catalyzes synthesis and secretion of CDP-diacylglycerol (CDP-DAG) in colorectal cancer cells. CDP-DAG binds transcription factor CEBPG and induces ferroptosis in myeloid-derived suppressor cells (MDSCs), relieving MDSC-mediated immunosuppression and enhancing cytotoxic T lymphocyte infiltration. CDP-DAG shows synergistic effects with anti-PDL1 therapy.\",\n      \"method\": \"In vitro and in vivo CDS1 loss-of-function models, MDSC ferroptosis assay, CEBPG binding assay, immune cell infiltration analysis, anti-PDL1 combination experiments\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo loss-of-function with multiple cellular readouts, binding assay for CEBPG, single lab\",\n      \"pmids\": [\"41161459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CDS1 acts as a suppressor of nasopharyngeal carcinoma by decreasing intracellular lipid droplet formation. Restoring CDS1 expression suppresses NPC cell growth, migration, and invasion. CDS1 also promotes NF-κB pathway activation, increasing inflammatory cytokines and enhancing tumor immunogenicity in vivo.\",\n      \"method\": \"CDS1 re-expression in NPC cells, lipid droplet quantification, colony formation and invasion assays, in vivo tumor model, NF-κB pathway analysis\",\n      \"journal\": \"Cell adhesion & migration\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function with in vivo validation and multiple cellular readouts, single lab\",\n      \"pmids\": [\"40566856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CDS1 downregulation in asthmatic epithelium results in decreased synthesis of phosphatidylinositol (PI) and PI(4,5)P2, suppressing PI3K/AKT signaling. CDS1 overexpression reverses the protective effects of bacterial cellulose on asthma in vivo, confirming CDS1 as a key node linking CDP-diacylglycerol/phosphoinositide metabolism to PI3K/AKT pathway activity.\",\n      \"method\": \"BALF metabolomics, single-cell RNA sequencing, CDS1 overexpression in vivo (mouse asthma model), PI and PIP2 measurement, PI3K/AKT pathway readouts\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo overexpression rescue with lipid metabolomics and signaling pathway readouts, single lab\",\n      \"pmids\": [\"41407218\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CDS1 (CDP-diacylglycerol synthase 1) encodes an essential integral ER membrane enzyme that converts phosphatidic acid to CDP-diacylglycerol, serving as the rate-limiting step for phosphatidylinositol and phosphoinositide resynthesis; in the context of checkpoint biology, the fission yeast and human orthologs (SpCds1/hCds1/CHK2) are serine/threonine kinases activated in a two-stage mechanism involving Mrc1-dependent recruitment to stalled replication forks, Rad3/ATM-dependent priming phosphorylation (T11 in SpCds1; T68 in hCds1), FHA-domain-mediated dimerization, and trans-autophosphorylation of the activation loop (T328), whereupon activated Cds1 phosphorylates and inhibits Cdc25, phosphorylates Wee1, stabilizes Mik1, regulates Mus81 endonuclease chromatin association, and phosphorylates p53, thereby enforcing the S-M replication checkpoint and coordinating DNA repair; in mammalian cells, the CDS1 lipid enzyme function is regulated through PKC/cFos signaling downstream of PLC activation and is synthetically lethal with CDS2 when CDS1 expression is low, with the CDS1/CDP-DAG axis also modulating tumor immunity through MDSC ferroptosis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"The CDS1 symbol in this corpus resolves to two mechanistically distinct proteins. The dominant body of evidence describes a checkpoint serine/threonine kinase (the fission yeast Cds1 and its human ortholog HuCds1/CHK2) that enforces the S-phase replication checkpoint in response to DNA damage and replication arrest [#0, #3]. This kinase is activated in a two-stage mechanism: the replication mediator Mrc1 recruits Cds1 to stalled forks through phospho-dependent interactions between Rad3-phosphorylated Mrc1 and the Cds1 FHA domain, enabling Rad3/ATM-dependent priming phosphorylation (Thr-11 in fission yeast, Thr-68 in human Cds1), after which primed molecules dimerize via the FHA domain and activate by trans-autophosphorylation of activation-loop residue Thr-328, with the C-terminal tail acting as an autoinhibitory element on unprimed monomers [#7, #11, #14, #16, #18]. Activated Cds1 phosphorylates Cdc25 on multiple serines to promote 14-3-3 binding and block Cdc2 activation, phosphorylates the Cdc2 inhibitor Wee1 and stabilizes Mik1, and phosphorylates p53 at DNA-damage-inducible sites, thereby coupling fork arrest to cell-cycle delay [#1, #2, #6]. At the fork, Cds1 controls genome stability by FHA-dependent phosphorylation of the Mus81 endonuclease, driving its dissociation from chromatin to prevent cleavage of stalled forks, and by regulating the repair proteins Rad60 and the phosphatase Flp1 [#15, #13, #17]. A separate, biochemically unrelated set of findings identifies CDS1 as an essential integral ER-membrane CDP-diacylglycerol synthase that converts phosphatidic acid to CDP-diacylglycerol for phosphatidylinositol and phosphoinositide synthesis [#24]. In mammalian cells this lipid enzyme is transcriptionally induced by sustained PLC/PKC/cFos signaling, is synthetically lethal with its paralog CDS2, and the CDS1/CDP-DAG axis modulates phosphoinositide-dependent signaling and tumor biology [#25, #26, #29]. Because the kinase findings and the lipid-synthase findings describe fundamentally distinct activities, they are reported separately and not as one protein.\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established that Cds1 is a checkpoint kinase activated specifically during S phase, defining an S-phase-specific arm of the DNA damage/replication checkpoint distinct from the general checkpoint response.\",\n      \"evidence\": \"Genetic epistasis with checkpoint rad mutants, kinase assays, and Cds1-Rad26 co-IP in fission yeast\",\n      \"pmids\": [\"9450932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define direct substrates\", \"Did not resolve how the S-phase signal reaches Cds1\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identified the downstream effectors linking Cds1 to mitotic inhibition, showing it acts through Wee1, Mik1, and Cdc25 to restrain Cdc2.\",\n      \"evidence\": \"Genetic epistasis (cds1 chk1 double mutants), kinase assays, Wee1/Cdc25 phosphosite mapping and 14-3-3 binding assays in fission yeast\",\n      \"pmids\": [\"9572736\", \"9774107\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the upstream Cds1 activation mechanism\", \"Relative contribution of each effector to arrest unresolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrated that the human ortholog HuCds1/CHK2 conserves the checkpoint function, responding to ionizing radiation in an ATM-dependent manner and to hydroxyurea ATM-independently, and phosphorylating Cdc25C.\",\n      \"evidence\": \"In vitro kinase assays on Cdc25C, 14-3-3 binding assays, ATM-deficient cell lines with IR and HU treatment\",\n      \"pmids\": [\"10097108\", \"9889122\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Priming phosphorylation site not yet identified\", \"Mechanism of FHA-mediated activation not addressed\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined the ATM priming site Thr-68 on human Cds1 and identified p53 as a substrate, linking the kinase to G1 arrest and the p53 damage response.\",\n      \"evidence\": \"In vitro ATM phosphorylation of T68, T68A mutagenesis with G1 arrest assays, and in vitro p53 phosphorylation comparing tetrameric vs monomeric substrate\",\n      \"pmids\": [\"11025670\", \"10673501\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address the activation-loop autophosphorylation step\", \"In vivo significance of p53 phosphorylation not quantified\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified the fission yeast priming site Thr-11 and established Mrc1 as the mediator that channels the replication-arrest signal from Rad3 to Cds1.\",\n      \"evidence\": \"In vitro Rad3/ATM kinase assays on Cds1 T11, T11A mutagenesis with HU-sensitivity and checkpoint assays, and Mrc1-Cds1 co-IP with mrc1 deletion analysis\",\n      \"pmids\": [\"11313465\", \"11715017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how Mrc1 physically engages Cds1\", \"Activation-loop and dimerization steps still open\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Linked Cds1 to fork stabilization and recombinational repair through the fork-protection factor Swi1 and the repair protein Rad60.\",\n      \"evidence\": \"Genetic epistasis (swi1 cds1), Rad22 foci, chromatin fractionation, and Cds1-Rad60 co-IP with kinase and localization assays in fission yeast\",\n      \"pmids\": [\"14560029\", \"12897162\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish direct biochemical hierarchy among fork factors\", \"Functional consequence of Rad60 delocalization on repair outcome incompletely defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved the recruitment mechanism, showing phosphorylated Mrc1 engages the Cds1 FHA domain to enable Rad3-Rad26-dependent Thr-11 priming, bypassable by a Rad26-Cds1 fusion.\",\n      \"evidence\": \"Yeast two-hybrid, FHA domain mutagenesis, Rad26-Cds1 fusion rescue, and in vivo T11 phosphorylation in fission yeast\",\n      \"pmids\": [\"15173168\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the dimerization/autoactivation step\", \"Stoichiometry of the recruitment complex unresolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined how Cds1 protects stalled forks, showing FHA-dependent phosphorylation of Mus81 drives its dissociation from chromatin to prevent endonucleolytic cleavage.\",\n      \"evidence\": \"FHA-binding-motif mutant co-IP, in vivo phosphorylation, chromatin fractionation, and mutator phenotype assays in fission yeast\",\n      \"pmids\": [\"15805465\", \"11073977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not quantify fork restart kinetics after Mus81 removal\", \"Whether other nucleases are similarly regulated unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Assembled the complete two-stage activation model: Mrc1-FHA recruitment plus Rad3 priming, then phospho-FHA-mediated dimerization and autophosphorylation.\",\n      \"evidence\": \"Biochemical reconstitution with FHA interaction mapping, phosphosite analysis, dimerization and in vitro kinase assays\",\n      \"pmids\": [\"16618806\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not pinpoint the single residue sufficient for catalytic activation\", \"Structural basis of FHA dimer not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified the activation-loop residue Thr-328 as the sole modification required for catalysis and defined the C-terminal tail as an autoinhibitory element.\",\n      \"evidence\": \"In vitro kinase assays with phosphosite mutagenesis, trans-autophosphorylation assays, and C-terminal truncation analysis\",\n      \"pmids\": [\"19357077\", \"19596787\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural mechanism of tail-mediated autoinhibition not solved\", \"Conservation of T328 regulation in human CHK2 not addressed here\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Extended Cds1 checkpoint signaling to vertebrates, showing Xenopus Cds1 responds selectively to double-stranded DNA ends and constitutively associates with an ATR complex regulated by DNA-PK-primed phosphorylation.\",\n      \"evidence\": \"Cell-free egg extracts with immunodepletion, XCds1-ATR co-IP, domain mutagenesis, and sequential phosphorylation mapping\",\n      \"pmids\": [\"10793133\", \"15509799\", \"11591827\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Negative result for checkpoint delay leaves XCds1's effector role unclear\", \"SH3-binding-region engagement mapped indirectly\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Established the unrelated CDS1 lipid-enzyme identity: an essential CDP-diacylglycerol synthase providing the bulk of cellular activity and controlling the balance of phosphatidylinositol synthesis.\",\n      \"evidence\": \"Null-mutant lethality, GAL1-driven overexpression, in vitro CDP-DAG synthase activity assays, and phospholipid measurement in S. cerevisiae\",\n      \"pmids\": [\"8557688\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural or catalytic-mechanism detail\", \"Relationship to the kinase-named Cds1 is none — distinct protein\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established the mammalian CDS1 lipid enzyme as a paralog-redundant, signaling-regulated node, synthetically lethal with CDS2 and modulating phosphoinositide-dependent pathways and tumor biology.\",\n      \"evidence\": \"PLC/PKC/cFos pharmacological dissection with qRT-PCR; CRISPR paired-gene screens with CDS1 re-expression rescue; in vivo lipid and PI3K/AKT readouts in cancer and asthma models\",\n      \"pmids\": [\"30862571\", \"40615675\", \"41161459\", \"40566856\", \"41407218\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct enzymatic kinetics of human CDS1 not measured here\", \"Mechanistic link from CDP-DAG to downstream phenotypes incompletely defined\", \"Tissue-specific contributions of CDS1 vs CDS2 not fully resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how the two distinct CDS1 activities (checkpoint kinase versus CDP-diacylglycerol synthase) relate in this corpus, and whether the human kinase activation mechanism mirrors the dissected fission yeast pathway in full.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No discovery reconciles the kinase and lipid-synthase identities\", \"Human CHK2 activation-loop and autoinhibition steps not directly tested in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 2, 6, 15, 16, 18]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 3, 18]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [24, 26]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 17]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [17]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [24, 25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 1, 2, 7]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [8, 13, 15]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [10, 12, 16]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [24, 25, 26]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"Mrc1\", \"Rad26\", \"Mus81\", \"Rad60\", \"Cdc25\", \"CDS2\", \"CEBPG\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":5,"faith_total":6,"faith_pct":83.33333333333333}}