{"gene":"KISS1","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2001,"finding":"KISS1 encodes a 54-amino-acid carboxy-terminally amidated peptide (metastin/kisspeptin-54) that is the endogenous ligand of the orphan G-protein-coupled receptor hOT7T175 (GPR54/KISS1R); binding of metastin to GPR54-transfected CHO cells inhibits chemotaxis and invasion in vitro, and attenuates pulmonary metastasis of GPR54-transfected B16-BL6 melanoma cells in vivo.","method":"Peptide isolation from human placenta, receptor binding/activation assays in GPR54-transfected CHO cells, in vitro chemotaxis/invasion assays, in vivo mouse melanoma metastasis model","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — peptide purification, receptor identification, in vitro functional assays, and in vivo validation in a single rigorous study; foundational paper widely replicated","pmids":["11385580"],"is_preprint":false},{"year":2002,"finding":"Activation of the mouse KiSS1 receptor by kisspeptin peptide couples to Gαq-mediated phospholipase C-β (PLC-β) and downstream Ca2+ signaling, and inhibits cell proliferation and cell migration in transfected cells.","method":"Identification of mouse KiSS1/receptor homologs, PLC-β activation assays, cell proliferation and migration assays in receptor-expressing cell lines","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of receptor-Gαq-PLC-β signaling with functional readouts; single lab, multiple orthogonal methods","pmids":["12359743"],"is_preprint":false},{"year":2005,"finding":"KISS1 overexpression in ovarian cancer cells inhibits cell migration induced by serum or lysophosphatidic acid (LPA) and suppresses metastatic colonization in a mouse xenograft model; the anti-migratory effect is reversed ~80% by PKC activation, and shRNA knockdown of PKCα restores KISS1-mediated inhibition of migration, indicating PKCα inhibition as a key mechanism.","method":"KISS1 overexpression in SKOV3 cells, cell migration assays, soft-agar colony assays, xenograft mouse metastasis model, PKC activator rescue experiments, PKCα shRNA knockdown","journal":"Clinical & experimental metastasis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo functional assays with pathway rescue (PKCα shRNA), single lab","pmids":["16283480"],"is_preprint":false},{"year":2007,"finding":"Kiss1 knockout mice are infertile with hypogonadotropic hypogonadism (reduced FSH, small testes/ovaries), confirming that kisspeptin is required as the ligand for GPR54 to gate sexual maturation; Kiss1 KO mice, unlike Gpr54 KO mice, respond to exogenous kisspeptin with gonadotropin release, confirming the receptor remains functional.","method":"Targeted gene deletion of Kiss1 or Gpr54 on matched genetic background, gonadal morphometry, hormone measurements, kisspeptin challenge in KO mice","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with rigorous phenotyping plus pharmacological rescue; replicated by multiple independent studies","pmids":["17595229"],"is_preprint":false},{"year":2010,"finding":"An inactivating homozygous missense mutation in KISS1 in humans causes failure of pubertal progression (hypogonadotropic hypogonadism), establishing that functional kisspeptin is required for puberty and reproduction in humans.","method":"Whole-gene sequencing in a large consanguineous human family; identification of inactivating KISS1 mutation; clinical phenotyping","journal":"The New England journal of medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — human loss-of-function genetics with clear phenotype; confirmed by multiple independent mutation studies","pmids":["22335740"],"is_preprint":false},{"year":2010,"finding":"Two KISS1 missense mutations (p.P74S and p.H90D) found in children with idiopathic central precocious puberty (CPP); the P74S variant shows increased resistance to serum degradation compared to wild-type kisspeptin-54, suggesting prolonged biological activity as a gain-of-function mechanism.","method":"Gene sequencing in CPP/IHH patients, in vitro IP accumulation assay with wild-type and mutant kp54, serum stability assay","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional in vitro assays plus serum stability, single lab; mechanism (stability) orthogonal to signaling activity","pmids":["20237166"],"is_preprint":false},{"year":2014,"finding":"Furin is the major proprotein convertase responsible for processing the KISS1 precursor protein into kisspeptin peptides; shRNA knockdown of furin (but not PCSK5 or PCSK7) blocks KISS1 processing in cell lines, and broad proprotein convertase inhibitors (Dec-RVKR-CMK and α1-PDX) completely inhibit processing.","method":"Proprotein convertase inhibitor treatment of KISS1-overexpressing cell lines, systematic mRNA expression analysis of six convertases, shRNA knockdown of furin/PCSK5/PCSK7 with western blot readout of KISS1 processing","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with inhibitors plus gene-specific shRNA knockdown, multiple convertases tested, single lab with multiple orthogonal methods","pmids":["24454770"],"is_preprint":false},{"year":2010,"finding":"Secretion of KISS1 is required for its full metastasis-suppressive activity; overexpression of a KISS1 construct lacking the secretion signal sequence (KFMΔSS) reduced but did not abolish liver/lung metastases in an orthotopic pancreatic cancer mouse model, whereas full-length KISS1 virtually eliminated lung metastases.","method":"Orthotopic SCID mouse xenograft with luciferase-labeled S2VP10 cells expressing full-length KISS1, secretion-signal-deleted KISS1 (KFMΔSS), or control; bioluminescence imaging; IHC","journal":"Clinical & experimental metastasis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo model with two constructs, single lab; secretion requirement demonstrated by comparative deletion construct","pmids":["20844932"],"is_preprint":false},{"year":2014,"finding":"KiSS1/GPR54 signaling inhibits breast cancer cell migration and epithelial-mesenchymal transition (EMT) via PKC-dependent phosphorylation of protein kinase D1 (PKD1), which in turn decreases the EMT transcription factor Slug and increases E-cadherin expression; GPR54 or PKD1 knockdown increases migration and invasion.","method":"Kisspeptin stimulation of multiple breast cancer cell lines, migration/invasion assays, 3D matrigel colony assay, siRNA knockdown of GPR54 and PKD1, western blot of pPKD1/Slug/E-cadherin","journal":"Current molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cell lines, siRNA, western blot, functional assays; single lab","pmids":["24894166"],"is_preprint":false},{"year":2011,"finding":"Loss of KISS1 expression in cisplatin-resistant head and neck squamous cell carcinoma cells is mechanistically linked to increased glutathione S-transferase-π (GSTπ) expression and function; genetic reconstitution of KISS1 in resistant cells restores cisplatin sensitivity and abrogates cell migration, and improves survival in an orthotopic mouse model.","method":"PCR arrays identifying KISS1 suppression in CDDP-resistant cell lines, KISS1 knockdown/overexpression, GSTπ expression analysis, in vitro migration assays, orthotopic mouse model, survival analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro mechanistic link to GSTπ with in vivo confirmation, single lab","pmids":["21383688"],"is_preprint":false},{"year":2011,"finding":"KISS1R (GPR54) activation by kisspeptin-10 in mammary tumor cells signals through Gαq-p63RhoGEF to activate RhoA; RhoA-dependent anchorage-independent growth correlates with dose-dependent KISS1R-mediated RhoA regulation, and siRNA knockdown of KISS1R or RhoA inactivation reduces Ras-induced anchorage-independent growth in MCF10A cells.","method":"Kiss1r heterozygous MMTV-PyMT mouse model, primary tumor cell isolation, in vitro tumorigenic assays, in vivo growth in NOD.SCID mice, siRNA knockdown of KISS1R/RhoA, RhoA activation assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic model plus in vitro pathway dissection; Gαq-p63RhoGEF-RhoA pathway placed downstream of KISS1R, single lab","pmids":["21852382"],"is_preprint":false},{"year":2011,"finding":"The transcription factors TTF1 and CUX1-p200 activate the human KISS1 promoter, while EAP1, YY1, and CUX1-p110 repress it; all four factors are recruited in vivo to the KISS1 promoter (ChIP) and are expressed in kisspeptin neurons; a single transcription start site was mapped 153–156 bp upstream of the ATG.","method":"RACE-PCR to map TSS, promoter-reporter assays in 293 MSR and GT1-7 cells, ChIP of endogenous promoter occupancy","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro promoter assays plus in vivo ChIP; single lab, multiple TFs tested","pmids":["21672609"],"is_preprint":false},{"year":2012,"finding":"Adiponectin reduces Kiss1 gene transcription in hypothalamic GT1-7 neurons via AMPK activation; AMPK activation decreases nuclear translocation of specificity protein-1 (SP1), which reduces KISS1 promoter activity and mRNA levels; AMPK inhibition has the opposite effect, confirmed in vivo in rat hypothalamus.","method":"GT1-7 cell treatment with globular adiponectin/AICAR/Compound C, KISS1 mRNA and promoter-luciferase assays, AMPKα1 siRNA, SP1 nuclear translocation immunofluorescence, in vivo rat hypothalamic kisspeptin immunostaining","journal":"The Journal of endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based and in vivo assays, multiple inhibitors/activators, single lab","pmids":["22582096"],"is_preprint":false},{"year":2013,"finding":"Kiss1 neurons in the AVPV/PeN exhibit estradiol-dependent shifts in firing pattern (resting membrane potential, cell capacitance, and spontaneous IPSC amplitude); these changes require estrogen receptor α (ERα) in Kiss1 neurons, as mice with selective ERα deletion from Kiss1 neurons show cellular activity similar to ovariectomized females.","method":"Patch-clamp electrophysiology of Kiss1-GFP neurons in brain slices, selective ERα knockout from Kiss1 neurons (Cre-lox), estradiol treatment of OVX mice","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct electrophysiology plus conditional cell-type-specific KO; single lab with two orthogonal methods","pmids":["23407940"],"is_preprint":false},{"year":2014,"finding":"Estradiol increases GHSR mRNA expression and colocalization of GHSR with ERα selectively in ARC Kiss1 neurons; ghrelin acutely depolarizes a higher proportion of ARC Kiss1 neurons in estradiol-treated OVX mice (75%) versus OVX controls (25%), demonstrating that estradiol modulates the responsiveness of kisspeptin neurons to ghrelin.","method":"GHSR/ERα co-expression by in situ hybridization/immunofluorescence, patch-clamp electrophysiology of ARC Kiss1 neurons in estradiol-treated vs. oil-treated OVX mice","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct electrophysiology with estradiol manipulation; single lab, two methods (ISH + electrophysiology)","pmids":["24473434"],"is_preprint":false},{"year":2018,"finding":"SIRT1, a fuel-sensing deacetylase, epigenetically represses Kiss1 expression by interacting with the Polycomb silencing complex to decrease Kiss1 promoter activity; SIRT1 is expressed in hypothalamic Kiss1 neurons; as puberty approaches, SIRT1 is evicted from the Kiss1 promoter permitting a repressive-to-permissive chromatin switch; overnutrition accelerates these changes and advances puberty, while undernutrition raises SIRT1 and delays puberty.","method":"ChIP for SIRT1 and Polycomb components at Kiss1 promoter, SIRT1 transgenic mice, virogenetic SIRT1 overexpression in ARC, pharmacological SIRT1 activation, Kiss1 expression and puberty timing assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP, transgenesis, virogenetic targeting, pharmacology, and in vivo phenotype; multiple orthogonal methods in one study","pmids":["30305620"],"is_preprint":false},{"year":2018,"finding":"Gonadotropin-stimulated KISS1 expression in ovarian granulosa cells requires estrogen receptor β (ESR2); ESR2 binds to estrogen response elements (EREs) in the Kiss1 promoter and enhancers; gonadotropin-induced MAPK ERK2 phosphorylates ESR2, and AP-1 factors FOSL2/JUNB synergistically activate the Kiss1 promoter; mutation of the ERE within the Kiss1 promoter blocks ESR2-driven activity.","method":"ESR2 ChIP on Kiss1 promoter/enhancers in granulosa cells, Kiss1 promoter-luciferase assays with ESR2 overexpression and ERE mutation, Esr2-null rat ovary phenotyping, phospho-ESR2 western blot","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP, mutagenesis, promoter-reporter, loss-of-function (KO), multiple orthogonal methods, single lab","pmids":["30277501"],"is_preprint":false},{"year":2017,"finding":"KISS1 is a downstream target of canonical TGFβ/Smad2 signaling in triple-negative breast cancer (TNBC) cells; KISS1 expression is required for TGFβ-induced invasion and MMP9 induction; kisspeptin-10 (KP-10) independently stimulates TNBC cell invasion through MAPK/ERK activation; a KISS1 small peptide antagonist (p234) blocks TGFβ-mediated invasion.","method":"RNA-seq identification of KISS1 as TGFβ target, KISS1 knockdown with shRNA, invasion assays, MMP9 activity by zymography, ERK inhibitor experiments, KP-10 treatment, p234 antagonist blocking","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-seq target identification confirmed by shRNA functional rescue and pharmacological antagonism; single lab, multiple methods","pmids":["28988968"],"is_preprint":false},{"year":2021,"finding":"EGF downregulates KISS1 expression in human trophoblast cells via EGFR-mediated PI3K/AKT signaling; this requires downregulation of the transcription factor ID3, which is needed for KISS1 expression; functionally, EGF-mediated KISS1 suppression promotes trophoblast invasion.","method":"RNA-seq in EGF-treated HTR-8/SVneo cells identifying KISS1 as a target, PI3K/AKT inhibitor experiments, ID3 siRNA knockdown, KISS1 siRNA, transwell invasion assays, serum EGF and KISS1 measurements in preeclampsia patients","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-seq plus siRNA knockdown of pathway components with functional invasion readout; single lab, multiple orthogonal methods","pmids":["34620174"],"is_preprint":false},{"year":2021,"finding":"NHLH2 (Nescient Helix-Loop-Helix 2) transcription factor is enriched in Kiss1 neurons and directly binds to and activates the KISS1 and TAC3 promoters (confirmed by ChIP); conditional ablation of Nhlh2 from Kiss1 neurons in male mice delays puberty and decreases arcuate Kiss1 expression, with impaired LH response to metabolic challenge.","method":"Drop-Seq of arcuate nucleus, in situ hybridization, in vitro luciferase assays, ChIP for NHLH2 on KISS1/TAC3 promoters, conditional Nhlh2 knockout from Kiss1 neurons (Kiss1Cre:Nhlh2fl/fl), puberty timing and LH assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — ChIP, promoter-reporter, and conditional in vivo KO with phenotype; multiple orthogonal methods in one study","pmids":["34494548"],"is_preprint":false},{"year":2022,"finding":"Congenital ablation of Dicer in Kiss1 neurons causes late-onset hypogonadotropic hypogonadism predominantly in females; failure to complete puberty is associated with reduced arcuate-nucleus Kiss1 levels linked to enhanced expression of Kiss1 repressors Mkrn3, Cbx7, and Eap1, revealing a miRNA-mediated inhibitory program that controls Kiss1 expression during pubertal transition.","method":"Conditional Dicer knockout in Kiss1-Cre mice, Kiss1 neuron counting, Kiss1/kisspeptin expression analysis, qPCR of repressors Mkrn3/Cbx7/Eap1, LH/FSH measurements, puberty timing assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined cellular phenotype and molecular pathway (repressor upregulation); multiple orthogonal methods, single rigorous study","pmids":["35945211"],"is_preprint":false},{"year":1998,"finding":"The KISS1 gene maps to chromosome 1q32 and consists of four exons; the first two exons are non-translated, exon 3 contains the translational start site, and exon 4 contains the bulk of the coding sequence and the polyadenylation signal.","method":"Genomic sequencing, radiation hybrid mapping, FISH","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic sequencing and cytogenetic mapping; single lab but direct structural determination","pmids":["9806840"],"is_preprint":false},{"year":2015,"finding":"Kiss1 neurons in the hypothalamus derive developmentally from POMC-expressing progenitors, establishing a developmental lineage link between nutrient-sensing (POMC/AgRP) and reproductive (Kiss1) neuropeptide-synthesizing neuronal populations.","method":"Embryonic and adult ribosome-tagging strategy in mice (Ribotag), lineage tracing with Pomc-Cre and Kiss1-reporter crosses","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic lineage tracing; single lab, novel in vivo approach","pmids":["25855171"],"is_preprint":false},{"year":2020,"finding":"ARC Kiss1 neurons project rostrally to periventricular and preoptic areas and to the lateral hypothalamus, as visualized by CLARITY 3D processing of whole brains from Kiss1-CRE:tdTomato reporter mice; ~80–90% of ARC tdTomato neurons co-label with kisspeptin, confirming high fidelity of the reporter.","method":"Kiss1-CRE transgenic mice crossed with tdTomato reporter, CLARITY whole-brain 3D imaging, co-immunolabeling for kisspeptin","journal":"Journal of neuroendocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct visualization of neuronal projections with validated reporter line; single lab","pmids":["27663274"],"is_preprint":false},{"year":2014,"finding":"Kisspeptin activates intracellular Ca2+ ([Ca2+]i) signaling in human ovarian mural granulosa cells (MGCs) via KISS1R; NKB co-stimulation partially suppresses this kisspeptin-induced Ca2+ response, with the inhibitory effect requiring a cocktail of NK1/NK2/NK3 receptor antagonists for reversal.","method":"RT-PCR and western blot for KISS1/KISS1R in MGCs/cumulus cells, intracellular Ca2+ measurement after kisspeptin and NKB treatment, tachykinin receptor antagonist experiments","journal":"Human reproduction (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct Ca2+ signaling assay with pharmacological dissection; single lab, functional assay in primary human cells","pmids":["25316443"],"is_preprint":false},{"year":2005,"finding":"Metastin (kisspeptin) increases intracellular Ca2+ ([Ca2+]i) in cultured rat hippocampal neurons that express GPR54, demonstrating direct biological activity of the KISS1-derived peptide in central neurons.","method":"GPR54 expression confirmed in hippocampal neurons, metastin-induced Ca2+ imaging, preabsorption controls with metastin peptide fragment","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct Ca2+ imaging with appropriate controls; single lab","pmids":["15593369"],"is_preprint":false}],"current_model":"KISS1 encodes a secreted precursor protein that is processed by furin into kisspeptin peptides (principally kisspeptin-54/metastin and kisspeptin-10), which act as endogenous ligands for the G-protein-coupled receptor GPR54 (KISS1R), coupling via Gαq to activate PLC-β/Ca2+ signaling and downstream effectors including PKCα, PKD1, and RhoA to suppress cancer cell migration and metastasis; in the hypothalamus, kisspeptin signaling is essential for GnRH and gonadotropin secretion, puberty onset, and fertility, with Kiss1 neuronal expression subject to transcriptional control by ERα, ERβ, NHLH2, EAP1, CUX1, and YY1, epigenetic regulation via SIRT1-Polycomb repression and DNA methylation, and metabolic modulation through the AMPK-SP1 and leptin axes."},"narrative":{"mechanistic_narrative":"KISS1 encodes a secreted precursor that is proteolytically matured by the proprotein convertase furin into the carboxy-amidated kisspeptin peptides (kisspeptin-54/metastin and shorter fragments), which serve as the endogenous ligands for the G-protein-coupled receptor GPR54/KISS1R [PMID:11385580, PMID:24454770]. Receptor engagement couples through Gαq to phospholipase C-β and intracellular Ca2+ mobilization, a signaling output demonstrated both in receptor-transfected cells and in native neurons [PMID:12359743, PMID:15593369]. KISS1 functions in two largely separable physiological arenas. As a metastasis suppressor, kisspeptin-GPR54 signaling inhibits cancer cell chemotaxis, invasion, and metastatic colonization [PMID:11385580, PMID:16283480]; the anti-migratory effect operates through PKCα inhibition and PKC-dependent PKD1 phosphorylation that lowers the EMT factor Slug and raises E-cadherin [PMID:16283480, PMID:24894166], and through a Gαq-p63RhoGEF-RhoA axis governing anchorage-independent growth [PMID:21852382], with secretion of the peptide required for full suppressive activity in vivo [PMID:20844932]. As a master regulator of reproduction, hypothalamic kisspeptin is essential for gonadotropin secretion and puberty: Kiss1-null mice are infertile with hypogonadotropic hypogonadism, and inactivating human KISS1 mutations cause failure of pubertal progression, while gain-of-function variants are linked to central precocious puberty [PMID:17595229, PMID:22335740, PMID:20237166]. Kiss1 neuronal output is set by a dense transcriptional and epigenetic control network — activated by TTF1, CUX1-p200, NHLH2, and estrogen receptors (ERα in AVPV/ARC neurons, ESR2 in granulosa cells via promoter EREs) and repressed by EAP1, YY1, CUX1-p110, SP1, and a SIRT1-Polycomb chromatin switch, with metabolic cues (adiponectin/AMPK, ghrelin, nutritional state) and miRNA programs tuning expression across the pubertal transition [PMID:21672609, PMID:23407940, PMID:30277501, PMID:34494548, PMID:30305620, PMID:22582096, PMID:35945211].","teleology":[{"year":2001,"claim":"Established the molecular identity of KISS1 as the precursor of a secreted ligand and linked it to a specific orphan receptor, defining the entire signaling axis.","evidence":"Peptide isolation from placenta, GPR54 receptor binding/activation in transfected CHO cells, and in vitro/in vivo metastasis assays","pmids":["11385580"],"confidence":"High","gaps":["Did not define downstream second-messenger coupling","In vivo source and processing of the endogenous peptide not addressed"]},{"year":2002,"claim":"Defined the proximal signaling output of the receptor, showing kisspeptin-GPR54 couples to Gαq-PLC-β/Ca2+ with anti-proliferative and anti-migratory consequences.","evidence":"Mouse ortholog identification, PLC-β activation, and proliferation/migration assays in receptor-expressing cells","pmids":["12359743"],"confidence":"High","gaps":["Effectors downstream of Ca2+ not yet identified","Tissue context of signaling not addressed"]},{"year":2005,"claim":"Confirmed direct peptide bioactivity on native central neurons, extending signaling beyond engineered cell lines.","evidence":"Metastin-induced Ca2+ imaging in GPR54-expressing rat hippocampal neurons with peptide preabsorption controls","pmids":["15593369"],"confidence":"Medium","gaps":["Physiological role in hippocampus unresolved","No link to behavioral or endocrine output"]},{"year":2005,"claim":"Identified PKCα inhibition as the mechanistic basis of kisspeptin's anti-migratory effect in cancer cells.","evidence":"KISS1 overexpression in ovarian cancer cells, migration/xenograft assays, PKC activator rescue, and PKCα shRNA knockdown","pmids":["16283480"],"confidence":"Medium","gaps":["Connection to receptor engagement not directly tested","Single cell-line context"]},{"year":2007,"claim":"Resolved whether KISS1 is required as the in vivo ligand for reproductive function, separating ligand loss from receptor loss.","evidence":"Targeted Kiss1 and Gpr54 deletions with hormone phenotyping and kisspeptin challenge in KO mice","pmids":["17595229"],"confidence":"High","gaps":["Did not address upstream transcriptional control of Kiss1","Neuronal circuit mechanism not dissected"]},{"year":2010,"claim":"Established that KISS1 dosage is physiologically tuned in humans, with loss-of-function causing hypogonadotropic hypogonadism and gain-of-function (stabilized peptide) linked to precocious puberty.","evidence":"Family sequencing of consanguineous IHH kindred and CPP patients, with serum stability and IP-accumulation assays of mutant kisspeptin-54","pmids":["22335740","20237166"],"confidence":"High","gaps":["Mechanism of stabilized-peptide variants is correlative","Penetrance and modifier effects not resolved"]},{"year":2010,"claim":"Showed that secretion of the KISS1 product is mechanistically required for its metastasis-suppressive function.","evidence":"Orthotopic pancreatic xenograft comparing full-length vs. secretion-signal-deleted KISS1 with bioluminescence imaging","pmids":["20844932"],"confidence":"Medium","gaps":["Residual activity of the non-secreted construct unexplained","Autocrine vs. paracrine action not separated"]},{"year":2011,"claim":"Extended the cancer signaling map by placing a Gαq-p63RhoGEF-RhoA pathway downstream of KISS1R controlling anchorage-independent growth.","evidence":"Kiss1r heterozygous MMTV-PyMT model, in vitro tumorigenic assays, and siRNA knockdown of KISS1R/RhoA with RhoA activation assays","pmids":["21852382"],"confidence":"Medium","gaps":["Context-dependence (pro- vs. anti-tumor) not reconciled","Single tumor model"]},{"year":2011,"claim":"Began defining the KISS1 transcriptional control network, mapping the promoter and identifying both activators and repressors recruited in vivo.","evidence":"RACE-PCR TSS mapping, promoter-reporter assays, and ChIP of TTF1, CUX1, EAP1, and YY1 occupancy","pmids":["21672609"],"confidence":"Medium","gaps":["Functional in vivo requirement of each factor not tested","Combinatorial logic unresolved"]},{"year":2011,"claim":"Linked KISS1 silencing to chemoresistance via a GSTπ-dependent mechanism in head and neck cancer.","evidence":"PCR arrays, KISS1 knockdown/reconstitution, GSTπ analysis, migration assays, and orthotopic survival model","pmids":["21383688"],"confidence":"Medium","gaps":["Direct molecular link between KISS1 and GSTπ regulation not defined","Single cancer type"]},{"year":2012,"claim":"Connected metabolic state to Kiss1 transcription, showing adiponectin/AMPK signaling represses Kiss1 by limiting SP1 nuclear translocation.","evidence":"GT1-7 neuron treatments, promoter-luciferase, AMPKα1 siRNA, SP1 immunofluorescence, and in vivo rat hypothalamic immunostaining","pmids":["22582096"],"confidence":"Medium","gaps":["Integration with other metabolic signals unresolved","Direct SP1 binding site not mapped"]},{"year":2013,"claim":"Demonstrated that estradiol shapes the intrinsic electrical properties of Kiss1 neurons through cell-autonomous ERα.","evidence":"Patch-clamp of Kiss1-GFP neurons plus selective ERα knockout from Kiss1 neurons in OVX/estradiol-treated mice","pmids":["23407940"],"confidence":"High","gaps":["Downstream channel/effector targets of ERα not identified","AVPV vs. ARC divergence not fully resolved"]},{"year":2014,"claim":"Established furin as the proprotein convertase that processes the KISS1 precursor into bioactive kisspeptin.","evidence":"Convertase inhibitor treatment, expression profiling of six convertases, and furin/PCSK5/PCSK7 shRNA with western readout","pmids":["24454770"],"confidence":"High","gaps":["Cleavage site stoichiometry and tissue specificity not detailed","Generation of shorter kisspeptin fragments not mapped"]},{"year":2014,"claim":"Defined a PKC-PKD1-Slug/E-cadherin axis through which kisspeptin-GPR54 suppresses breast cancer EMT and invasion.","evidence":"Kisspeptin stimulation across breast lines, migration/invasion/3D assays, GPR54 and PKD1 siRNA, and EMT-marker westerns","pmids":["24894166"],"confidence":"Medium","gaps":["Relationship to the RhoA pathway not reconciled","In vivo validation absent"]},{"year":2014,"claim":"Showed estradiol gates the metabolic responsiveness of ARC Kiss1 neurons to ghrelin via GHSR upregulation.","evidence":"GHSR/ERα co-expression mapping and patch-clamp of ARC Kiss1 neurons in estradiol- vs. oil-treated OVX mice","pmids":["24473434"],"confidence":"Medium","gaps":["Behavioral/endocrine consequence not measured","Mechanism of GHSR transcriptional induction unresolved"]},{"year":2014,"claim":"Extended kisspeptin Ca2+ signaling to human ovarian granulosa cells and revealed cross-talk with neurokinin B/tachykinin signaling.","evidence":"KISS1/KISS1R expression analysis and intracellular Ca2+ measurement with NKB co-stimulation and tachykinin antagonists in primary MGCs","pmids":["25316443"],"confidence":"Medium","gaps":["Physiological role in folliculogenesis not established","Mechanism of NKB suppression undefined"]},{"year":2015,"claim":"Revealed a developmental lineage link between nutrient-sensing POMC progenitors and reproductive Kiss1 neurons.","evidence":"Ribotag and Pomc-Cre/Kiss1-reporter lineage tracing in mice","pmids":["25855171"],"confidence":"Medium","gaps":["Functional consequence of shared lineage not tested","Fraction of Kiss1 neurons of POMC origin not quantified"]},{"year":2017,"claim":"Placed KISS1 within TGFβ/Smad2 signaling as a required mediator of invasion in triple-negative breast cancer, contrasting with its suppressive role elsewhere.","evidence":"RNA-seq target identification, KISS1 shRNA, invasion assays, MMP9 zymography, ERK inhibition, and p234 antagonist blocking","pmids":["28988968"],"confidence":"Medium","gaps":["Context-dependent pro- vs. anti-invasive switch not mechanistically reconciled","In vivo relevance not tested"]},{"year":2018,"claim":"Identified a SIRT1-Polycomb epigenetic switch coupling nutritional state to the timing of Kiss1 derepression at puberty.","evidence":"ChIP at Kiss1 promoter, SIRT1 transgenesis, virogenetic ARC overexpression, pharmacology, and puberty-timing assays","pmids":["30305620"],"confidence":"High","gaps":["Identity of the trigger evicting SIRT1 not defined","Sex-specific differences not detailed"]},{"year":2018,"claim":"Defined ESR2-driven, ERE-dependent activation of Kiss1 in ovarian granulosa cells downstream of gonadotropin/ERK and AP-1.","evidence":"ESR2 ChIP, promoter-luciferase with ERE mutation, Esr2-null rat ovary phenotyping, and phospho-ESR2 western blot","pmids":["30277501"],"confidence":"High","gaps":["Ovarian kisspeptin function in vivo not fully defined","Crosstalk with hypothalamic regulation unaddressed"]},{"year":2021,"claim":"Identified NHLH2 as a direct transcriptional activator of KISS1 required cell-autonomously for normal pubertal timing.","evidence":"Drop-Seq, in situ hybridization, luciferase, ChIP on KISS1/TAC3 promoters, and conditional Nhlh2 KO from Kiss1 neurons","pmids":["34494548"],"confidence":"High","gaps":["Sex differences in phenotype not fully resolved","Interaction with repressive network not mapped"]},{"year":2021,"claim":"Showed EGFR-PI3K/AKT signaling suppresses KISS1 via ID3 in trophoblasts to promote invasion, linking KISS1 to placental biology.","evidence":"RNA-seq, PI3K/AKT inhibition, ID3 and KISS1 siRNA, transwell invasion, and patient serum measurements in preeclampsia","pmids":["34620174"],"confidence":"Medium","gaps":["Direct ID3 binding to KISS1 promoter not shown","Causal role in preeclampsia not established"]},{"year":2022,"claim":"Revealed a miRNA (Dicer)-dependent program that restrains Kiss1 repressors during the pubertal transition.","evidence":"Conditional Dicer KO in Kiss1-Cre mice with neuron counting, repressor qPCR (Mkrn3/Cbx7/Eap1), and puberty/hormone assays","pmids":["35945211"],"confidence":"High","gaps":["Specific miRNAs responsible not identified","Female-predominant phenotype mechanism unresolved"]},{"year":null,"claim":"How the same kisspeptin-GPR54-Gαq axis produces opposite cellular outcomes (metastasis suppression vs. TGFβ-driven invasion) across tissue contexts remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model reconciling pro- and anti-invasive roles","No structural model of receptor-effector selectivity","Determinants of context-specific downstream effector choice (PKCα vs. RhoA vs. ERK) unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,1,25]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,24,25]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,7]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,10,8]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[3,4,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[15,19,22]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[11,16,19]}],"complexes":[],"partners":["KISS1R","GPR54","FURIN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15726","full_name":"Metastasis-suppressor KiSS-1","aliases":["Kisspeptin-1"],"length_aa":138,"mass_kda":14.7,"function":"Kisspeptins are ligands for the G-protein coupled receptor KISS1R/GPR54 (PubMed:11385580, PubMed:11457843, PubMed:11527393, PubMed:12879005, PubMed:15020672, PubMed:15596153). The hypothalamic KISS1/KISS1R signaling system plays a central role in the regulation of the hypothalamic-pituitary-gonadal reproductive axis by modulating the secretion of gonadotropin-releasing hormone (GnRH) from GnRH neurons (PubMed:15219839, PubMed:15598687, PubMed:22335740). In these neurons, kisspeptin binding to its receptor activates G(q)-dependent signaling, leading to phospholipase C (PLC) activation, and hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) (PubMed:15598687, PubMed:22335740). The subsequent rise in intracellular calcium levels results in the inhibition of inward rectifier potassium channels and activation of TRPC-like cation channels, leading to GnRH neurons depolarization and stimulation (By similarity). In addition to this pathway, kisspeptin also triggers G(q)-independent signaling via beta-arrestin, leading to MAPK cascade activation and ERK1/ERK2 phosphorylation (PubMed:25147978). Kisspeptins are also involved in the regulation of other processes including cell growth, cell proliferation and cell migration (PubMed:11385580, PubMed:11457843, PubMed:11527393, PubMed:12879005, PubMed:15020672, PubMed:15596153) Binds the G-protein coupled receptor KISS1R/GPR54 and triggers G protein-coupled receptor signaling via activation of G(q) and phosphatidylinositol 4,5-bisphosphate (PIP2) hydrolysis by phospholipase C (PubMed:11457843, PubMed:22335740). Binding to the receptor also activates beta-arrestin-dependent signaling resulting in ERK1/2 phosphorylation (PubMed:11457843, PubMed:25147978). Activation of the receptor inhibits cell proliferation and cell migration, and is involved in the regulation of trophoblast invasion during early stages of pregnancy. Is also involved in the modulation of airway smooth muscle cells migration (PubMed:11457843, PubMed:15020672, PubMed:38512807). In bone tissue, activation of KISS1R by kisspeptin-10 recruits phosphatase DUSP18 and SRC to the KISS1R C-terminus through a G(q)-dependent signaling pathway. This leads to DUSP18-mediated dephosphorylation of SRC, down-regulation of osteoclast differentiation and activity, and consequently suppression of bone resorption (By similarity) Receptor binding triggers G-protein coupled receptor signaling via activation of G(q) and phosphatidylinositol 4,5-bisphosphate (PIP2) hydrolysis by phospholipase C","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/Q15726/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KISS1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KISS1","total_profiled":1310},"omim":[{"mim_id":"620325","title":"TRANSMEMBRANE PROTEIN 144; TMEM144","url":"https://www.omim.org/entry/620325"},{"mim_id":"619755","title":"HYPOGONADOTROPIC HYPOGONADISM 27 WITHOUT ANOSMIA; HH27","url":"https://www.omim.org/entry/619755"},{"mim_id":"619246","title":"SPEXIN HORMONE; SPX","url":"https://www.omim.org/entry/619246"},{"mim_id":"616741","title":"PR DOMAIN-CONTAINING PROTEIN 13; PRDM13","url":"https://www.omim.org/entry/616741"},{"mim_id":"614842","title":"HYPOGONADOTROPIC HYPOGONADISM 13 WITH OR WITHOUT ANOSMIA; HH13","url":"https://www.omim.org/entry/614842"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"placenta","ntpm":220.0}],"url":"https://www.proteinatlas.org/search/KISS1"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q15726","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15726","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15726-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15726-F1-predicted_aligned_error_v6.png","plddt_mean":59.41},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KISS1","jax_strain_url":"https://www.jax.org/strain/search?query=KISS1"},"sequence":{"accession":"Q15726","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15726.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15726/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15726"}},"corpus_meta":[{"pmid":"11385580","id":"PMC_11385580","title":"Metastasis suppressor gene KiSS-1 encodes peptide ligand of a G-protein-coupled 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Calif.)","url":"https://pubmed.ncbi.nlm.nih.gov/30595091","citation_count":20,"is_preprint":false},{"pmid":"23915023","id":"PMC_23915023","title":"Association analysis between variants in KISS1 gene and litter size in goats.","date":"2013","source":"BMC genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23915023","citation_count":20,"is_preprint":false},{"pmid":"24894166","id":"PMC_24894166","title":"KiSS1-induced GPR54 signaling inhibits breast cancer cell migration and epithelial-mesenchymal transition via protein kinase D1.","date":"2014","source":"Current molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/24894166","citation_count":20,"is_preprint":false},{"pmid":"18219339","id":"PMC_18219339","title":"Expression of the metastasis suppressor gene KISS1 in uveal melanoma.","date":"2008","source":"Eye (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/18219339","citation_count":20,"is_preprint":false},{"pmid":"25846316","id":"PMC_25846316","title":"Honokiol suppresses metastasis of renal cell carcinoma by targeting KISS1/KISS1R signaling.","date":"2015","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/25846316","citation_count":19,"is_preprint":false},{"pmid":"24454770","id":"PMC_24454770","title":"Furin is the major proprotein convertase required for KISS1-to-Kisspeptin processing.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24454770","citation_count":19,"is_preprint":false},{"pmid":"22210725","id":"PMC_22210725","title":"KISS1/KISS1R expression in eutopic and ectopic endometrium of women suffering from endometriosis.","date":"2012","source":"In vivo (Athens, Greece)","url":"https://pubmed.ncbi.nlm.nih.gov/22210725","citation_count":18,"is_preprint":false},{"pmid":"33308008","id":"PMC_33308008","title":"Association analysis of KISS1 polymorphisms and haplotypes with polycystic ovary syndrome.","date":"2021","source":"British journal of biomedical 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preferentially in female mice.","date":"2022","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/35945211","citation_count":16,"is_preprint":false},{"pmid":"32088827","id":"PMC_32088827","title":"Role of the tumor microenvironment in regulating the anti-metastatic effect of KISS1.","date":"2020","source":"Clinical & experimental metastasis","url":"https://pubmed.ncbi.nlm.nih.gov/32088827","citation_count":16,"is_preprint":false},{"pmid":"31336647","id":"PMC_31336647","title":"Minireview: The Epigenetic Modulation of KISS1 in Reproduction and Cancer.","date":"2019","source":"International journal of environmental research and public health","url":"https://pubmed.ncbi.nlm.nih.gov/31336647","citation_count":16,"is_preprint":false},{"pmid":"30993114","id":"PMC_30993114","title":"Association of Kiss1 and GPR54 Gene Polymorphisms with Polycystic Ovary Syndrome among Sri Lankan Women.","date":"2019","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/30993114","citation_count":16,"is_preprint":false},{"pmid":"33218349","id":"PMC_33218349","title":"STAT4 targets KISS1 to promote the apoptosis of ovarian granulosa cells.","date":"2020","source":"Journal of ovarian research","url":"https://pubmed.ncbi.nlm.nih.gov/33218349","citation_count":16,"is_preprint":false},{"pmid":"34494548","id":"PMC_34494548","title":"Sex-specific pubertal and metabolic regulation of Kiss1 neurons via Nhlh2.","date":"2021","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/34494548","citation_count":15,"is_preprint":false},{"pmid":"27250217","id":"PMC_27250217","title":"Expression of EAP1 and CUX1 in the hypothalamus of female rats and relationship with KISS1 and GnRH.","date":"2016","source":"Endocrine journal","url":"https://pubmed.ncbi.nlm.nih.gov/27250217","citation_count":15,"is_preprint":false},{"pmid":"30759773","id":"PMC_30759773","title":"KISS1 Suppresses Apoptosis and Stimulates the Synthesis of E2 in Porcine Ovarian Granulosa Cells.","date":"2019","source":"Animals : an open access journal from MDPI","url":"https://pubmed.ncbi.nlm.nih.gov/30759773","citation_count":15,"is_preprint":false},{"pmid":"32170819","id":"PMC_32170819","title":"Expression of genes for Kisspeptin (KISS1), Neurokinin B (TAC3), Prodynorphin (PDYN), and gonadotropin inhibitory hormone (RFRP) across natural puberty in ewes.","date":"2020","source":"Physiological reports","url":"https://pubmed.ncbi.nlm.nih.gov/32170819","citation_count":14,"is_preprint":false},{"pmid":"24033850","id":"PMC_24033850","title":"KISS1 expression in colorectal cancer.","date":"2013","source":"APMIS : acta pathologica, microbiologica, et immunologica Scandinavica","url":"https://pubmed.ncbi.nlm.nih.gov/24033850","citation_count":13,"is_preprint":false},{"pmid":"25810563","id":"PMC_25810563","title":"Polymorphisms rs12998 and rs5780218 in KiSS1 suppressor metastasis gene in Mexican patients with breast cancer.","date":"2015","source":"Disease markers","url":"https://pubmed.ncbi.nlm.nih.gov/25810563","citation_count":13,"is_preprint":false},{"pmid":"28075440","id":"PMC_28075440","title":"The metastasis suppressor gene KISS-1 regulates osteosarcoma apoptosis and autophagy processes.","date":"2017","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/28075440","citation_count":13,"is_preprint":false},{"pmid":"24918545","id":"PMC_24918545","title":"Physicochemically and pharmacokinetically stable nonapeptide KISS1 receptor agonists with highly potent testosterone-suppressive activity.","date":"2014","source":"Journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24918545","citation_count":12,"is_preprint":false},{"pmid":"29552764","id":"PMC_29552764","title":"KISS1 and KISS1R expression in gastric cancer.","date":"2018","source":"Journal of B.U.ON. : official journal of the Balkan Union of Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/29552764","citation_count":11,"is_preprint":false},{"pmid":"36720764","id":"PMC_36720764","title":"KISS1 metastasis suppressor in tumor dormancy: a potential therapeutic target for metastatic cancers?","date":"2023","source":"Cancer metastasis reviews","url":"https://pubmed.ncbi.nlm.nih.gov/36720764","citation_count":11,"is_preprint":false},{"pmid":"26010933","id":"PMC_26010933","title":"A clinicopathological analysis of KISS1 and KISS1R expression in colorectal cancer.","date":"2015","source":"APMIS : acta pathologica, microbiologica, et immunologica Scandinavica","url":"https://pubmed.ncbi.nlm.nih.gov/26010933","citation_count":11,"is_preprint":false},{"pmid":"32380991","id":"PMC_32380991","title":"Influence of KISS1 gene polymorphisms on the risk of polycystic ovary syndrome and its associated variables, in Saudi women.","date":"2020","source":"BMC endocrine disorders","url":"https://pubmed.ncbi.nlm.nih.gov/32380991","citation_count":11,"is_preprint":false},{"pmid":"35247007","id":"PMC_35247007","title":"Immunocastration with gene vaccine (KISS1) induces a cell-mediated immune response in ram testis: A transcriptome evaluation.","date":"2022","source":"Reproduction in domestic animals = Zuchthygiene","url":"https://pubmed.ncbi.nlm.nih.gov/35247007","citation_count":10,"is_preprint":false},{"pmid":"37518187","id":"PMC_37518187","title":"Sex difference in developmental changes in visualized Kiss1 neurons in newly generated Kiss1-Cre rats.","date":"2023","source":"The Journal of reproduction and development","url":"https://pubmed.ncbi.nlm.nih.gov/37518187","citation_count":10,"is_preprint":false},{"pmid":"14709678","id":"PMC_14709678","title":"Differential expression of the closely linked KISS1, REN, and FLJ10761 genes in transgenic mice.","date":"2004","source":"Physiological genomics","url":"https://pubmed.ncbi.nlm.nih.gov/14709678","citation_count":10,"is_preprint":false},{"pmid":"32087275","id":"PMC_32087275","title":"Local expressions and function of Kiss1/GPR54 in goats' testes.","date":"2020","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/32087275","citation_count":10,"is_preprint":false},{"pmid":"30444171","id":"PMC_30444171","title":"Kiss1 and its receptor: molecular characterization and immunolocalization in the hypothalamus and corpus luteum of the buffalo.","date":"2018","source":"Animal biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/30444171","citation_count":10,"is_preprint":false},{"pmid":"36685939","id":"PMC_36685939","title":"CRISPR/Cas9-editing of KISS1 to generate pigs with hypogonadotropic hypogonadism as a castration free trait.","date":"2023","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/36685939","citation_count":10,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50215,"output_tokens":6839,"usd":0.126615,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16132,"output_tokens":6219,"usd":0.118068,"stage2_stop_reason":"end_turn"},"total_usd":0.244683,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"KISS1 encodes a 54-amino-acid carboxy-terminally amidated peptide (metastin/kisspeptin-54) that is the endogenous ligand of the orphan G-protein-coupled receptor hOT7T175 (GPR54/KISS1R); binding of metastin to GPR54-transfected CHO cells inhibits chemotaxis and invasion in vitro, and attenuates pulmonary metastasis of GPR54-transfected B16-BL6 melanoma cells in vivo.\",\n      \"method\": \"Peptide isolation from human placenta, receptor binding/activation assays in GPR54-transfected CHO cells, in vitro chemotaxis/invasion assays, in vivo mouse melanoma metastasis model\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — peptide purification, receptor identification, in vitro functional assays, and in vivo validation in a single rigorous study; foundational paper widely replicated\",\n      \"pmids\": [\"11385580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Activation of the mouse KiSS1 receptor by kisspeptin peptide couples to Gαq-mediated phospholipase C-β (PLC-β) and downstream Ca2+ signaling, and inhibits cell proliferation and cell migration in transfected cells.\",\n      \"method\": \"Identification of mouse KiSS1/receptor homologs, PLC-β activation assays, cell proliferation and migration assays in receptor-expressing cell lines\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of receptor-Gαq-PLC-β signaling with functional readouts; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"12359743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"KISS1 overexpression in ovarian cancer cells inhibits cell migration induced by serum or lysophosphatidic acid (LPA) and suppresses metastatic colonization in a mouse xenograft model; the anti-migratory effect is reversed ~80% by PKC activation, and shRNA knockdown of PKCα restores KISS1-mediated inhibition of migration, indicating PKCα inhibition as a key mechanism.\",\n      \"method\": \"KISS1 overexpression in SKOV3 cells, cell migration assays, soft-agar colony assays, xenograft mouse metastasis model, PKC activator rescue experiments, PKCα shRNA knockdown\",\n      \"journal\": \"Clinical & experimental metastasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo functional assays with pathway rescue (PKCα shRNA), single lab\",\n      \"pmids\": [\"16283480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Kiss1 knockout mice are infertile with hypogonadotropic hypogonadism (reduced FSH, small testes/ovaries), confirming that kisspeptin is required as the ligand for GPR54 to gate sexual maturation; Kiss1 KO mice, unlike Gpr54 KO mice, respond to exogenous kisspeptin with gonadotropin release, confirming the receptor remains functional.\",\n      \"method\": \"Targeted gene deletion of Kiss1 or Gpr54 on matched genetic background, gonadal morphometry, hormone measurements, kisspeptin challenge in KO mice\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with rigorous phenotyping plus pharmacological rescue; replicated by multiple independent studies\",\n      \"pmids\": [\"17595229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"An inactivating homozygous missense mutation in KISS1 in humans causes failure of pubertal progression (hypogonadotropic hypogonadism), establishing that functional kisspeptin is required for puberty and reproduction in humans.\",\n      \"method\": \"Whole-gene sequencing in a large consanguineous human family; identification of inactivating KISS1 mutation; clinical phenotyping\",\n      \"journal\": \"The New England journal of medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human loss-of-function genetics with clear phenotype; confirmed by multiple independent mutation studies\",\n      \"pmids\": [\"22335740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Two KISS1 missense mutations (p.P74S and p.H90D) found in children with idiopathic central precocious puberty (CPP); the P74S variant shows increased resistance to serum degradation compared to wild-type kisspeptin-54, suggesting prolonged biological activity as a gain-of-function mechanism.\",\n      \"method\": \"Gene sequencing in CPP/IHH patients, in vitro IP accumulation assay with wild-type and mutant kp54, serum stability assay\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional in vitro assays plus serum stability, single lab; mechanism (stability) orthogonal to signaling activity\",\n      \"pmids\": [\"20237166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Furin is the major proprotein convertase responsible for processing the KISS1 precursor protein into kisspeptin peptides; shRNA knockdown of furin (but not PCSK5 or PCSK7) blocks KISS1 processing in cell lines, and broad proprotein convertase inhibitors (Dec-RVKR-CMK and α1-PDX) completely inhibit processing.\",\n      \"method\": \"Proprotein convertase inhibitor treatment of KISS1-overexpressing cell lines, systematic mRNA expression analysis of six convertases, shRNA knockdown of furin/PCSK5/PCSK7 with western blot readout of KISS1 processing\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with inhibitors plus gene-specific shRNA knockdown, multiple convertases tested, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"24454770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Secretion of KISS1 is required for its full metastasis-suppressive activity; overexpression of a KISS1 construct lacking the secretion signal sequence (KFMΔSS) reduced but did not abolish liver/lung metastases in an orthotopic pancreatic cancer mouse model, whereas full-length KISS1 virtually eliminated lung metastases.\",\n      \"method\": \"Orthotopic SCID mouse xenograft with luciferase-labeled S2VP10 cells expressing full-length KISS1, secretion-signal-deleted KISS1 (KFMΔSS), or control; bioluminescence imaging; IHC\",\n      \"journal\": \"Clinical & experimental metastasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo model with two constructs, single lab; secretion requirement demonstrated by comparative deletion construct\",\n      \"pmids\": [\"20844932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"KiSS1/GPR54 signaling inhibits breast cancer cell migration and epithelial-mesenchymal transition (EMT) via PKC-dependent phosphorylation of protein kinase D1 (PKD1), which in turn decreases the EMT transcription factor Slug and increases E-cadherin expression; GPR54 or PKD1 knockdown increases migration and invasion.\",\n      \"method\": \"Kisspeptin stimulation of multiple breast cancer cell lines, migration/invasion assays, 3D matrigel colony assay, siRNA knockdown of GPR54 and PKD1, western blot of pPKD1/Slug/E-cadherin\",\n      \"journal\": \"Current molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cell lines, siRNA, western blot, functional assays; single lab\",\n      \"pmids\": [\"24894166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Loss of KISS1 expression in cisplatin-resistant head and neck squamous cell carcinoma cells is mechanistically linked to increased glutathione S-transferase-π (GSTπ) expression and function; genetic reconstitution of KISS1 in resistant cells restores cisplatin sensitivity and abrogates cell migration, and improves survival in an orthotopic mouse model.\",\n      \"method\": \"PCR arrays identifying KISS1 suppression in CDDP-resistant cell lines, KISS1 knockdown/overexpression, GSTπ expression analysis, in vitro migration assays, orthotopic mouse model, survival analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro mechanistic link to GSTπ with in vivo confirmation, single lab\",\n      \"pmids\": [\"21383688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"KISS1R (GPR54) activation by kisspeptin-10 in mammary tumor cells signals through Gαq-p63RhoGEF to activate RhoA; RhoA-dependent anchorage-independent growth correlates with dose-dependent KISS1R-mediated RhoA regulation, and siRNA knockdown of KISS1R or RhoA inactivation reduces Ras-induced anchorage-independent growth in MCF10A cells.\",\n      \"method\": \"Kiss1r heterozygous MMTV-PyMT mouse model, primary tumor cell isolation, in vitro tumorigenic assays, in vivo growth in NOD.SCID mice, siRNA knockdown of KISS1R/RhoA, RhoA activation assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic model plus in vitro pathway dissection; Gαq-p63RhoGEF-RhoA pathway placed downstream of KISS1R, single lab\",\n      \"pmids\": [\"21852382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The transcription factors TTF1 and CUX1-p200 activate the human KISS1 promoter, while EAP1, YY1, and CUX1-p110 repress it; all four factors are recruited in vivo to the KISS1 promoter (ChIP) and are expressed in kisspeptin neurons; a single transcription start site was mapped 153–156 bp upstream of the ATG.\",\n      \"method\": \"RACE-PCR to map TSS, promoter-reporter assays in 293 MSR and GT1-7 cells, ChIP of endogenous promoter occupancy\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro promoter assays plus in vivo ChIP; single lab, multiple TFs tested\",\n      \"pmids\": [\"21672609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Adiponectin reduces Kiss1 gene transcription in hypothalamic GT1-7 neurons via AMPK activation; AMPK activation decreases nuclear translocation of specificity protein-1 (SP1), which reduces KISS1 promoter activity and mRNA levels; AMPK inhibition has the opposite effect, confirmed in vivo in rat hypothalamus.\",\n      \"method\": \"GT1-7 cell treatment with globular adiponectin/AICAR/Compound C, KISS1 mRNA and promoter-luciferase assays, AMPKα1 siRNA, SP1 nuclear translocation immunofluorescence, in vivo rat hypothalamic kisspeptin immunostaining\",\n      \"journal\": \"The Journal of endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based and in vivo assays, multiple inhibitors/activators, single lab\",\n      \"pmids\": [\"22582096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Kiss1 neurons in the AVPV/PeN exhibit estradiol-dependent shifts in firing pattern (resting membrane potential, cell capacitance, and spontaneous IPSC amplitude); these changes require estrogen receptor α (ERα) in Kiss1 neurons, as mice with selective ERα deletion from Kiss1 neurons show cellular activity similar to ovariectomized females.\",\n      \"method\": \"Patch-clamp electrophysiology of Kiss1-GFP neurons in brain slices, selective ERα knockout from Kiss1 neurons (Cre-lox), estradiol treatment of OVX mice\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct electrophysiology plus conditional cell-type-specific KO; single lab with two orthogonal methods\",\n      \"pmids\": [\"23407940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Estradiol increases GHSR mRNA expression and colocalization of GHSR with ERα selectively in ARC Kiss1 neurons; ghrelin acutely depolarizes a higher proportion of ARC Kiss1 neurons in estradiol-treated OVX mice (75%) versus OVX controls (25%), demonstrating that estradiol modulates the responsiveness of kisspeptin neurons to ghrelin.\",\n      \"method\": \"GHSR/ERα co-expression by in situ hybridization/immunofluorescence, patch-clamp electrophysiology of ARC Kiss1 neurons in estradiol-treated vs. oil-treated OVX mice\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct electrophysiology with estradiol manipulation; single lab, two methods (ISH + electrophysiology)\",\n      \"pmids\": [\"24473434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SIRT1, a fuel-sensing deacetylase, epigenetically represses Kiss1 expression by interacting with the Polycomb silencing complex to decrease Kiss1 promoter activity; SIRT1 is expressed in hypothalamic Kiss1 neurons; as puberty approaches, SIRT1 is evicted from the Kiss1 promoter permitting a repressive-to-permissive chromatin switch; overnutrition accelerates these changes and advances puberty, while undernutrition raises SIRT1 and delays puberty.\",\n      \"method\": \"ChIP for SIRT1 and Polycomb components at Kiss1 promoter, SIRT1 transgenic mice, virogenetic SIRT1 overexpression in ARC, pharmacological SIRT1 activation, Kiss1 expression and puberty timing assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP, transgenesis, virogenetic targeting, pharmacology, and in vivo phenotype; multiple orthogonal methods in one study\",\n      \"pmids\": [\"30305620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Gonadotropin-stimulated KISS1 expression in ovarian granulosa cells requires estrogen receptor β (ESR2); ESR2 binds to estrogen response elements (EREs) in the Kiss1 promoter and enhancers; gonadotropin-induced MAPK ERK2 phosphorylates ESR2, and AP-1 factors FOSL2/JUNB synergistically activate the Kiss1 promoter; mutation of the ERE within the Kiss1 promoter blocks ESR2-driven activity.\",\n      \"method\": \"ESR2 ChIP on Kiss1 promoter/enhancers in granulosa cells, Kiss1 promoter-luciferase assays with ESR2 overexpression and ERE mutation, Esr2-null rat ovary phenotyping, phospho-ESR2 western blot\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP, mutagenesis, promoter-reporter, loss-of-function (KO), multiple orthogonal methods, single lab\",\n      \"pmids\": [\"30277501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KISS1 is a downstream target of canonical TGFβ/Smad2 signaling in triple-negative breast cancer (TNBC) cells; KISS1 expression is required for TGFβ-induced invasion and MMP9 induction; kisspeptin-10 (KP-10) independently stimulates TNBC cell invasion through MAPK/ERK activation; a KISS1 small peptide antagonist (p234) blocks TGFβ-mediated invasion.\",\n      \"method\": \"RNA-seq identification of KISS1 as TGFβ target, KISS1 knockdown with shRNA, invasion assays, MMP9 activity by zymography, ERK inhibitor experiments, KP-10 treatment, p234 antagonist blocking\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-seq target identification confirmed by shRNA functional rescue and pharmacological antagonism; single lab, multiple methods\",\n      \"pmids\": [\"28988968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"EGF downregulates KISS1 expression in human trophoblast cells via EGFR-mediated PI3K/AKT signaling; this requires downregulation of the transcription factor ID3, which is needed for KISS1 expression; functionally, EGF-mediated KISS1 suppression promotes trophoblast invasion.\",\n      \"method\": \"RNA-seq in EGF-treated HTR-8/SVneo cells identifying KISS1 as a target, PI3K/AKT inhibitor experiments, ID3 siRNA knockdown, KISS1 siRNA, transwell invasion assays, serum EGF and KISS1 measurements in preeclampsia patients\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-seq plus siRNA knockdown of pathway components with functional invasion readout; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"34620174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NHLH2 (Nescient Helix-Loop-Helix 2) transcription factor is enriched in Kiss1 neurons and directly binds to and activates the KISS1 and TAC3 promoters (confirmed by ChIP); conditional ablation of Nhlh2 from Kiss1 neurons in male mice delays puberty and decreases arcuate Kiss1 expression, with impaired LH response to metabolic challenge.\",\n      \"method\": \"Drop-Seq of arcuate nucleus, in situ hybridization, in vitro luciferase assays, ChIP for NHLH2 on KISS1/TAC3 promoters, conditional Nhlh2 knockout from Kiss1 neurons (Kiss1Cre:Nhlh2fl/fl), puberty timing and LH assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP, promoter-reporter, and conditional in vivo KO with phenotype; multiple orthogonal methods in one study\",\n      \"pmids\": [\"34494548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Congenital ablation of Dicer in Kiss1 neurons causes late-onset hypogonadotropic hypogonadism predominantly in females; failure to complete puberty is associated with reduced arcuate-nucleus Kiss1 levels linked to enhanced expression of Kiss1 repressors Mkrn3, Cbx7, and Eap1, revealing a miRNA-mediated inhibitory program that controls Kiss1 expression during pubertal transition.\",\n      \"method\": \"Conditional Dicer knockout in Kiss1-Cre mice, Kiss1 neuron counting, Kiss1/kisspeptin expression analysis, qPCR of repressors Mkrn3/Cbx7/Eap1, LH/FSH measurements, puberty timing assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined cellular phenotype and molecular pathway (repressor upregulation); multiple orthogonal methods, single rigorous study\",\n      \"pmids\": [\"35945211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The KISS1 gene maps to chromosome 1q32 and consists of four exons; the first two exons are non-translated, exon 3 contains the translational start site, and exon 4 contains the bulk of the coding sequence and the polyadenylation signal.\",\n      \"method\": \"Genomic sequencing, radiation hybrid mapping, FISH\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic sequencing and cytogenetic mapping; single lab but direct structural determination\",\n      \"pmids\": [\"9806840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Kiss1 neurons in the hypothalamus derive developmentally from POMC-expressing progenitors, establishing a developmental lineage link between nutrient-sensing (POMC/AgRP) and reproductive (Kiss1) neuropeptide-synthesizing neuronal populations.\",\n      \"method\": \"Embryonic and adult ribosome-tagging strategy in mice (Ribotag), lineage tracing with Pomc-Cre and Kiss1-reporter crosses\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic lineage tracing; single lab, novel in vivo approach\",\n      \"pmids\": [\"25855171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ARC Kiss1 neurons project rostrally to periventricular and preoptic areas and to the lateral hypothalamus, as visualized by CLARITY 3D processing of whole brains from Kiss1-CRE:tdTomato reporter mice; ~80–90% of ARC tdTomato neurons co-label with kisspeptin, confirming high fidelity of the reporter.\",\n      \"method\": \"Kiss1-CRE transgenic mice crossed with tdTomato reporter, CLARITY whole-brain 3D imaging, co-immunolabeling for kisspeptin\",\n      \"journal\": \"Journal of neuroendocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct visualization of neuronal projections with validated reporter line; single lab\",\n      \"pmids\": [\"27663274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Kisspeptin activates intracellular Ca2+ ([Ca2+]i) signaling in human ovarian mural granulosa cells (MGCs) via KISS1R; NKB co-stimulation partially suppresses this kisspeptin-induced Ca2+ response, with the inhibitory effect requiring a cocktail of NK1/NK2/NK3 receptor antagonists for reversal.\",\n      \"method\": \"RT-PCR and western blot for KISS1/KISS1R in MGCs/cumulus cells, intracellular Ca2+ measurement after kisspeptin and NKB treatment, tachykinin receptor antagonist experiments\",\n      \"journal\": \"Human reproduction (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct Ca2+ signaling assay with pharmacological dissection; single lab, functional assay in primary human cells\",\n      \"pmids\": [\"25316443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Metastin (kisspeptin) increases intracellular Ca2+ ([Ca2+]i) in cultured rat hippocampal neurons that express GPR54, demonstrating direct biological activity of the KISS1-derived peptide in central neurons.\",\n      \"method\": \"GPR54 expression confirmed in hippocampal neurons, metastin-induced Ca2+ imaging, preabsorption controls with metastin peptide fragment\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct Ca2+ imaging with appropriate controls; single lab\",\n      \"pmids\": [\"15593369\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KISS1 encodes a secreted precursor protein that is processed by furin into kisspeptin peptides (principally kisspeptin-54/metastin and kisspeptin-10), which act as endogenous ligands for the G-protein-coupled receptor GPR54 (KISS1R), coupling via Gαq to activate PLC-β/Ca2+ signaling and downstream effectors including PKCα, PKD1, and RhoA to suppress cancer cell migration and metastasis; in the hypothalamus, kisspeptin signaling is essential for GnRH and gonadotropin secretion, puberty onset, and fertility, with Kiss1 neuronal expression subject to transcriptional control by ERα, ERβ, NHLH2, EAP1, CUX1, and YY1, epigenetic regulation via SIRT1-Polycomb repression and DNA methylation, and metabolic modulation through the AMPK-SP1 and leptin axes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KISS1 encodes a secreted precursor that is proteolytically matured by the proprotein convertase furin into the carboxy-amidated kisspeptin peptides (kisspeptin-54/metastin and shorter fragments), which serve as the endogenous ligands for the G-protein-coupled receptor GPR54/KISS1R [#0, #6]. Receptor engagement couples through G\\u03b1q to phospholipase C-\\u03b2 and intracellular Ca2+ mobilization, a signaling output demonstrated both in receptor-transfected cells and in native neurons [#1, #25]. KISS1 functions in two largely separable physiological arenas. As a metastasis suppressor, kisspeptin-GPR54 signaling inhibits cancer cell chemotaxis, invasion, and metastatic colonization [#0, #2]; the anti-migratory effect operates through PKC\\u03b1 inhibition and PKC-dependent PKD1 phosphorylation that lowers the EMT factor Slug and raises E-cadherin [#2, #8], and through a G\\u03b1q-p63RhoGEF-RhoA axis governing anchorage-independent growth [#10], with secretion of the peptide required for full suppressive activity in vivo [#7]. As a master regulator of reproduction, hypothalamic kisspeptin is essential for gonadotropin secretion and puberty: Kiss1-null mice are infertile with hypogonadotropic hypogonadism, and inactivating human KISS1 mutations cause failure of pubertal progression, while gain-of-function variants are linked to central precocious puberty [#3, #4, #5]. Kiss1 neuronal output is set by a dense transcriptional and epigenetic control network \\u2014 activated by TTF1, CUX1-p200, NHLH2, and estrogen receptors (ER\\u03b1 in AVPV/ARC neurons, ESR2 in granulosa cells via promoter EREs) and repressed by EAP1, YY1, CUX1-p110, SP1, and a SIRT1-Polycomb chromatin switch, with metabolic cues (adiponectin/AMPK, ghrelin, nutritional state) and miRNA programs tuning expression across the pubertal transition [#11, #13, #16, #19, #15, #12, #20].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established the molecular identity of KISS1 as the precursor of a secreted ligand and linked it to a specific orphan receptor, defining the entire signaling axis.\",\n      \"evidence\": \"Peptide isolation from placenta, GPR54 receptor binding/activation in transfected CHO cells, and in vitro/in vivo metastasis assays\",\n      \"pmids\": [\"11385580\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define downstream second-messenger coupling\", \"In vivo source and processing of the endogenous peptide not addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined the proximal signaling output of the receptor, showing kisspeptin-GPR54 couples to G\\u03b1q-PLC-\\u03b2/Ca2+ with anti-proliferative and anti-migratory consequences.\",\n      \"evidence\": \"Mouse ortholog identification, PLC-\\u03b2 activation, and proliferation/migration assays in receptor-expressing cells\",\n      \"pmids\": [\"12359743\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effectors downstream of Ca2+ not yet identified\", \"Tissue context of signaling not addressed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Confirmed direct peptide bioactivity on native central neurons, extending signaling beyond engineered cell lines.\",\n      \"evidence\": \"Metastin-induced Ca2+ imaging in GPR54-expressing rat hippocampal neurons with peptide preabsorption controls\",\n      \"pmids\": [\"15593369\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological role in hippocampus unresolved\", \"No link to behavioral or endocrine output\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified PKC\\u03b1 inhibition as the mechanistic basis of kisspeptin's anti-migratory effect in cancer cells.\",\n      \"evidence\": \"KISS1 overexpression in ovarian cancer cells, migration/xenograft assays, PKC activator rescue, and PKC\\u03b1 shRNA knockdown\",\n      \"pmids\": [\"16283480\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Connection to receptor engagement not directly tested\", \"Single cell-line context\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved whether KISS1 is required as the in vivo ligand for reproductive function, separating ligand loss from receptor loss.\",\n      \"evidence\": \"Targeted Kiss1 and Gpr54 deletions with hormone phenotyping and kisspeptin challenge in KO mice\",\n      \"pmids\": [\"17595229\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address upstream transcriptional control of Kiss1\", \"Neuronal circuit mechanism not dissected\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established that KISS1 dosage is physiologically tuned in humans, with loss-of-function causing hypogonadotropic hypogonadism and gain-of-function (stabilized peptide) linked to precocious puberty.\",\n      \"evidence\": \"Family sequencing of consanguineous IHH kindred and CPP patients, with serum stability and IP-accumulation assays of mutant kisspeptin-54\",\n      \"pmids\": [\"22335740\", \"20237166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of stabilized-peptide variants is correlative\", \"Penetrance and modifier effects not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed that secretion of the KISS1 product is mechanistically required for its metastasis-suppressive function.\",\n      \"evidence\": \"Orthotopic pancreatic xenograft comparing full-length vs. secretion-signal-deleted KISS1 with bioluminescence imaging\",\n      \"pmids\": [\"20844932\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Residual activity of the non-secreted construct unexplained\", \"Autocrine vs. paracrine action not separated\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended the cancer signaling map by placing a G\\u03b1q-p63RhoGEF-RhoA pathway downstream of KISS1R controlling anchorage-independent growth.\",\n      \"evidence\": \"Kiss1r heterozygous MMTV-PyMT model, in vitro tumorigenic assays, and siRNA knockdown of KISS1R/RhoA with RhoA activation assays\",\n      \"pmids\": [\"21852382\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Context-dependence (pro- vs. anti-tumor) not reconciled\", \"Single tumor model\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Began defining the KISS1 transcriptional control network, mapping the promoter and identifying both activators and repressors recruited in vivo.\",\n      \"evidence\": \"RACE-PCR TSS mapping, promoter-reporter assays, and ChIP of TTF1, CUX1, EAP1, and YY1 occupancy\",\n      \"pmids\": [\"21672609\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional in vivo requirement of each factor not tested\", \"Combinatorial logic unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked KISS1 silencing to chemoresistance via a GST\\u03c0-dependent mechanism in head and neck cancer.\",\n      \"evidence\": \"PCR arrays, KISS1 knockdown/reconstitution, GST\\u03c0 analysis, migration assays, and orthotopic survival model\",\n      \"pmids\": [\"21383688\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between KISS1 and GST\\u03c0 regulation not defined\", \"Single cancer type\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected metabolic state to Kiss1 transcription, showing adiponectin/AMPK signaling represses Kiss1 by limiting SP1 nuclear translocation.\",\n      \"evidence\": \"GT1-7 neuron treatments, promoter-luciferase, AMPK\\u03b11 siRNA, SP1 immunofluorescence, and in vivo rat hypothalamic immunostaining\",\n      \"pmids\": [\"22582096\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Integration with other metabolic signals unresolved\", \"Direct SP1 binding site not mapped\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated that estradiol shapes the intrinsic electrical properties of Kiss1 neurons through cell-autonomous ER\\u03b1.\",\n      \"evidence\": \"Patch-clamp of Kiss1-GFP neurons plus selective ER\\u03b1 knockout from Kiss1 neurons in OVX/estradiol-treated mice\",\n      \"pmids\": [\"23407940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream channel/effector targets of ER\\u03b1 not identified\", \"AVPV vs. ARC divergence not fully resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established furin as the proprotein convertase that processes the KISS1 precursor into bioactive kisspeptin.\",\n      \"evidence\": \"Convertase inhibitor treatment, expression profiling of six convertases, and furin/PCSK5/PCSK7 shRNA with western readout\",\n      \"pmids\": [\"24454770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cleavage site stoichiometry and tissue specificity not detailed\", \"Generation of shorter kisspeptin fragments not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined a PKC-PKD1-Slug/E-cadherin axis through which kisspeptin-GPR54 suppresses breast cancer EMT and invasion.\",\n      \"evidence\": \"Kisspeptin stimulation across breast lines, migration/invasion/3D assays, GPR54 and PKD1 siRNA, and EMT-marker westerns\",\n      \"pmids\": [\"24894166\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relationship to the RhoA pathway not reconciled\", \"In vivo validation absent\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed estradiol gates the metabolic responsiveness of ARC Kiss1 neurons to ghrelin via GHSR upregulation.\",\n      \"evidence\": \"GHSR/ER\\u03b1 co-expression mapping and patch-clamp of ARC Kiss1 neurons in estradiol- vs. oil-treated OVX mice\",\n      \"pmids\": [\"24473434\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Behavioral/endocrine consequence not measured\", \"Mechanism of GHSR transcriptional induction unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended kisspeptin Ca2+ signaling to human ovarian granulosa cells and revealed cross-talk with neurokinin B/tachykinin signaling.\",\n      \"evidence\": \"KISS1/KISS1R expression analysis and intracellular Ca2+ measurement with NKB co-stimulation and tachykinin antagonists in primary MGCs\",\n      \"pmids\": [\"25316443\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological role in folliculogenesis not established\", \"Mechanism of NKB suppression undefined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed a developmental lineage link between nutrient-sensing POMC progenitors and reproductive Kiss1 neurons.\",\n      \"evidence\": \"Ribotag and Pomc-Cre/Kiss1-reporter lineage tracing in mice\",\n      \"pmids\": [\"25855171\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of shared lineage not tested\", \"Fraction of Kiss1 neurons of POMC origin not quantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed KISS1 within TGF\\u03b2/Smad2 signaling as a required mediator of invasion in triple-negative breast cancer, contrasting with its suppressive role elsewhere.\",\n      \"evidence\": \"RNA-seq target identification, KISS1 shRNA, invasion assays, MMP9 zymography, ERK inhibition, and p234 antagonist blocking\",\n      \"pmids\": [\"28988968\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Context-dependent pro- vs. anti-invasive switch not mechanistically reconciled\", \"In vivo relevance not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified a SIRT1-Polycomb epigenetic switch coupling nutritional state to the timing of Kiss1 derepression at puberty.\",\n      \"evidence\": \"ChIP at Kiss1 promoter, SIRT1 transgenesis, virogenetic ARC overexpression, pharmacology, and puberty-timing assays\",\n      \"pmids\": [\"30305620\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the trigger evicting SIRT1 not defined\", \"Sex-specific differences not detailed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined ESR2-driven, ERE-dependent activation of Kiss1 in ovarian granulosa cells downstream of gonadotropin/ERK and AP-1.\",\n      \"evidence\": \"ESR2 ChIP, promoter-luciferase with ERE mutation, Esr2-null rat ovary phenotyping, and phospho-ESR2 western blot\",\n      \"pmids\": [\"30277501\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ovarian kisspeptin function in vivo not fully defined\", \"Crosstalk with hypothalamic regulation unaddressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified NHLH2 as a direct transcriptional activator of KISS1 required cell-autonomously for normal pubertal timing.\",\n      \"evidence\": \"Drop-Seq, in situ hybridization, luciferase, ChIP on KISS1/TAC3 promoters, and conditional Nhlh2 KO from Kiss1 neurons\",\n      \"pmids\": [\"34494548\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Sex differences in phenotype not fully resolved\", \"Interaction with repressive network not mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed EGFR-PI3K/AKT signaling suppresses KISS1 via ID3 in trophoblasts to promote invasion, linking KISS1 to placental biology.\",\n      \"evidence\": \"RNA-seq, PI3K/AKT inhibition, ID3 and KISS1 siRNA, transwell invasion, and patient serum measurements in preeclampsia\",\n      \"pmids\": [\"34620174\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ID3 binding to KISS1 promoter not shown\", \"Causal role in preeclampsia not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed a miRNA (Dicer)-dependent program that restrains Kiss1 repressors during the pubertal transition.\",\n      \"evidence\": \"Conditional Dicer KO in Kiss1-Cre mice with neuron counting, repressor qPCR (Mkrn3/Cbx7/Eap1), and puberty/hormone assays\",\n      \"pmids\": [\"35945211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific miRNAs responsible not identified\", \"Female-predominant phenotype mechanism unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the same kisspeptin-GPR54-G\\u03b1q axis produces opposite cellular outcomes (metastasis suppression vs. TGF\\u03b2-driven invasion) across tissue contexts remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model reconciling pro- and anti-invasive roles\", \"No structural model of receptor-effector selectivity\", \"Determinants of context-specific downstream effector choice (PKC\\u03b1 vs. RhoA vs. ERK) unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 25]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 24, 25]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 10, 8]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [3, 4, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [15, 19, 22]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [11, 16, 19]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"KISS1R\",\n      \"GPR54\",\n      \"FURIN\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}