eLifePub Date : 2025-01-08DOI: 10.7554/eLife.98661
Susan Lin, Aravind R Gade, Hong-Gang Wang, James E Niemeyer, Allison Galante, Isabella DiStefano, Patrick Towers, Jorge Nunez, Maiko Matsui, Theodore H Schwartz, Anjali Rajadhyaksha, Geoffrey S Pitt
{"title":"Interneuron FGF13 regulates seizure susceptibility via a sodium channel-independent mechanism.","authors":"Susan Lin, Aravind R Gade, Hong-Gang Wang, James E Niemeyer, Allison Galante, Isabella DiStefano, Patrick Towers, Jorge Nunez, Maiko Matsui, Theodore H Schwartz, Anjali Rajadhyaksha, Geoffrey S Pitt","doi":"10.7554/eLife.98661","DOIUrl":"https://doi.org/10.7554/eLife.98661","url":null,"abstract":"<p><p>Developmental and epileptic encephalopathies (DEEs), a class of devastating neurological disorders characterized by recurrent seizures and exacerbated by disruptions to excitatory/inhibitory balance in the brain, are commonly caused by mutations in ion channels. Disruption of, or variants in, <i>FGF13</i> were implicated as causal for a set of DEEs, but the underlying mechanisms were clouded because <i>FGF13</i> is expressed in both excitatory and inhibitory neurons, <i>FGF13</i> undergoes extensive alternative splicing producing multiple isoforms with distinct functions, and the overall roles of FGF13 in neurons are incompletely cataloged. To overcome these challenges, we generated a set of novel cell-type-specific conditional knockout mice. Interneuron-targeted deletion of <i>Fgf13</i> led to perinatal mortality associated with extensive seizures and impaired the hippocampal inhibitory/excitatory balance while excitatory neuron-targeted deletion of <i>Fgf13</i> caused no detectable seizures and no survival deficits. While best studied as a voltage-gated sodium channel (Na<sub>v</sub>) regulator, we observed no effect of <i>Fgf13</i> ablation in interneurons on Na<sub>v</sub>s but rather a marked reduction in K<sup>+</sup> channel currents. Re-expressing different <i>Fgf13</i> splice isoforms could partially rescue deficits in interneuron excitability and restore K<sup>+</sup> channel current amplitude. These results enhance our understanding of the molecular mechanisms that drive the pathogenesis of <i>Fgf13-</i>related seizures and expand our understanding of FGF13 functions in different neuron subsets.</p>","PeriodicalId":11640,"journal":{"name":"eLife","volume":"13 ","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11709433/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142946439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
eLifePub Date : 2025-01-08DOI: 10.7554/eLife.100856
Su Young Han, Shel-Hwa Yeo, Jae-Chang Kim, Ziyue Zhou, Allan E Herbison
{"title":"Multi-dimensional oscillatory activity of mouse GnRH neurons in vivo.","authors":"Su Young Han, Shel-Hwa Yeo, Jae-Chang Kim, Ziyue Zhou, Allan E Herbison","doi":"10.7554/eLife.100856","DOIUrl":"https://doi.org/10.7554/eLife.100856","url":null,"abstract":"<p><p>The gonadotropin-releasing hormone (GnRH) neurons represent the key output cells of the neural network controlling mammalian fertility. We used GCaMP fiber photometry to record the population activity of the GnRH neuron distal projections in the ventral arcuate nucleus where they merge before entering the median eminence to release GnRH into the portal vasculature. Recordings in freely behaving intact male and female mice revealed abrupt ~8 min duration increases in activity that correlated perfectly with the appearance of a subsequent pulse of luteinizing hormone (LH). The GnRH neuron dendrons also exhibited a low level of unchanging clustered, rapidly fluctuating baseline activity in males and throughout the estrous cycle in females. In female mice, a gradual increase in basal activity that exhibited ~80 min oscillations began in the afternoon of proestrus and lasted for 12 hr. This was associated with the onset of the LH surge that ended several hours before the fall in the GCaMP signal. Abrupt 8 min duration episodes of GCaMP activity continued to occur on top of the rising surge baseline before ceasing in estrus. These observations provide the first description of GnRH neuron activity in freely behaving animals. They demonstrate that three distinct patterns of oscillatory activity occur in GnRH neurons. These are comprised of low-level rapid baseline activity, abrupt 8 min duration oscillations that drive pulsatile gonadotropin secretion, and, in females, a gradual and very prolonged oscillating increase in activity responsible for the preovulatory LH surge.</p>","PeriodicalId":11640,"journal":{"name":"eLife","volume":"13 ","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11709428/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142946441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
eLifePub Date : 2025-01-07DOI: 10.7554/eLife.91168
Angel D'Oliviera, Xuhang Dai, Saba Mottaghinia, Sophie Olson, Evan P Geissler, Lucie Etienne, Yingkai Zhang, Jeffrey S Mugridge
{"title":"Recognition and cleavage of human tRNA methyltransferase TRMT1 by the SARS-CoV-2 main protease.","authors":"Angel D'Oliviera, Xuhang Dai, Saba Mottaghinia, Sophie Olson, Evan P Geissler, Lucie Etienne, Yingkai Zhang, Jeffrey S Mugridge","doi":"10.7554/eLife.91168","DOIUrl":"10.7554/eLife.91168","url":null,"abstract":"<p><p>The SARS-CoV-2 main protease (M<sup>pro</sup> or Nsp5) is critical for production of viral proteins during infection and, like many viral proteases, also targets host proteins to subvert their cellular functions. Here, we show that the human tRNA methyltransferase TRMT1 is recognized and cleaved by SARS-CoV-2 M<sup>pro</sup>. TRMT1 installs the <i>N</i><sup>2</sup>,<i>N</i><sup>2</sup>-dimethylguanosine (m2,2G) modification on mammalian tRNAs, which promotes cellular protein synthesis and redox homeostasis. We find that M<sup>pro</sup> can cleave endogenous TRMT1 in human cell lysate, resulting in removal of the TRMT1 zinc finger domain. Evolutionary analysis shows the TRMT1 cleavage site is highly conserved in mammals, except in Muroidea, where TRMT1 is likely resistant to cleavage. TRMT1 proteolysis results in reduced tRNA binding and elimination of tRNA methyltransferase activity. We also determined the structure of an M<sup>pro</sup>-TRMT1 peptide complex that shows how TRMT1 engages the M<sup>pro</sup> active site in an uncommon substrate binding conformation. Finally, enzymology and molecular dynamics simulations indicate that kinetic discrimination occurs during a later step of M<sup>pro</sup>-mediated proteolysis following substrate binding. Together, these data provide new insights into substrate recognition by SARS-CoV-2 M<sup>pro</sup> that could help guide future antiviral therapeutic development and show how proteolysis of TRMT1 during SARS-CoV-2 infection impairs both TRMT1 tRNA binding and tRNA modification activity to disrupt host translation and potentially impact COVID-19 pathogenesis or phenotypes.</p>","PeriodicalId":11640,"journal":{"name":"eLife","volume":"12 ","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11706605/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142946569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
eLifePub Date : 2025-01-07DOI: 10.7554/eLife.105903
Van Schepler-Luu, Coline Sciallano, Melissa Stiebner, Chonghui Ji, Gabriel Boulard, Amadou Diallo, Florence Auguy, Si Nian Char, Yugander Arra, Kyrylo Schenstnyi, Marcel Buchholzer, Eliza P I Loo, Atugonza L Bilaro, David Lihepanyama, Mohammed Mkuya, Rosemary Murori, Ricardo Oliva, Sebastien Cunnac, Bing Yang, Boris Szurek, Wolf B Frommer
{"title":"Correction: Genome editing of an African elite rice variety confers resistance against endemic and emerging <i>Xanthomonas oryzae</i> pv. <i>oryzae</i> strains.","authors":"Van Schepler-Luu, Coline Sciallano, Melissa Stiebner, Chonghui Ji, Gabriel Boulard, Amadou Diallo, Florence Auguy, Si Nian Char, Yugander Arra, Kyrylo Schenstnyi, Marcel Buchholzer, Eliza P I Loo, Atugonza L Bilaro, David Lihepanyama, Mohammed Mkuya, Rosemary Murori, Ricardo Oliva, Sebastien Cunnac, Bing Yang, Boris Szurek, Wolf B Frommer","doi":"10.7554/eLife.105903","DOIUrl":"https://doi.org/10.7554/eLife.105903","url":null,"abstract":"<p><p></p>","PeriodicalId":11640,"journal":{"name":"eLife","volume":"14 ","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11706601/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142946547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
eLifePub Date : 2025-01-07DOI: 10.7554/eLife.94825
Emily Delgouffe, Samuel Madureira Silva, Frédéric Chalmel, Wilfried Cools, Camille Raets, Kelly Tilleman, Guy T'Sjoen, Yoni Baert, Ellen Goossens
{"title":"Partial rejuvenation of the spermatogonial stem cell niche after gender-affirming hormone therapy in trans women.","authors":"Emily Delgouffe, Samuel Madureira Silva, Frédéric Chalmel, Wilfried Cools, Camille Raets, Kelly Tilleman, Guy T'Sjoen, Yoni Baert, Ellen Goossens","doi":"10.7554/eLife.94825","DOIUrl":"https://doi.org/10.7554/eLife.94825","url":null,"abstract":"<p><p>Although the impact of gender-affirming hormone therapy (GAHT) on spermatogenesis in trans women has already been studied, data on its precise effects on the testicular environment is poor. Therefore, this study aimed to characterize, through histological and transcriptomic analysis, the spermatogonial stem cell niche of 106 trans women who underwent standardized GAHT, comprising estrogens and cyproterone acetate. A partial dedifferentiation of Sertoli cells was observed, marked by the co-expression of androgen receptor and anti-Müllerian hormone which mirrors the situation in peripubertal boys. The Leydig cells also exhibited a distribution analogous to peripubertal tissue, accompanied by a reduced insulin-like factor 3 expression. Although most peritubular myoid cells expressed alpha-smooth muscle actin 2, the expression pattern was disturbed. Besides this, fibrosis was particularly evident in the tubular wall and the lumen was collapsing in most participants. A spermatogenic arrest was also observed in all participants. The transcriptomic profile of transgender tissue confirmed a loss of mature characteristics - a partial rejuvenation - of the spermatogonial stem cell niche and, in addition, detected inflammation processes occurring in the samples. The present study shows that GAHT changes the spermatogonial stem cell niche by partially rejuvenating the somatic cells and inducing fibrotic processes. These findings are important to further understand how estrogens and testosterone suppression affect the testis environment, and in the case of orchidectomized testes as medical waste material, their potential use in research.</p>","PeriodicalId":11640,"journal":{"name":"eLife","volume":"13 ","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11706602/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142946447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
eLifePub Date : 2025-01-07DOI: 10.7554/eLife.98992
Zigmunds Orlovskis, Archana Singh, Adi Kliot, Weijie Huang, Saskia A Hogenhout
{"title":"The phytoplasma SAP54 effector acts as a molecular matchmaker for leafhopper vectors by targeting plant MADS-box factor SVP.","authors":"Zigmunds Orlovskis, Archana Singh, Adi Kliot, Weijie Huang, Saskia A Hogenhout","doi":"10.7554/eLife.98992","DOIUrl":"https://doi.org/10.7554/eLife.98992","url":null,"abstract":"<p><p>Obligate parasites often trigger significant changes in their hosts to facilitate transmission to new hosts. The molecular mechanisms behind these extended phenotypes - where genetic information of one organism is manifested as traits in another - remain largely unclear. This study explores the role of the virulence protein SAP54, produced by parasitic phytoplasmas, in attracting leafhopper vectors. SAP54 is responsible for the induction of leaf-like flowers in phytoplasma-infected plants. However, we previously demonstrated that the insects were attracted to leaves and the leaf-like flowers were not required. Here, we made the surprising discovery that leaf exposure to leafhopper males is required for the attraction phenotype, suggesting a leaf response that distinguishes leafhopper sex in the presence of SAP54. In contrast, this phytoplasma effector alongside leafhopper females discourages further female colonization. We demonstrate that SAP54 effectively suppresses biotic stress response pathways in leaves exposed to the males. Critically, the host plant MADS-box transcription factor short vegetative phase (SVP) emerges as a key element in the female leafhopper preference for plants exposed to males, with SAP54 promoting the degradation of SVP. This preference extends to female colonization of male-exposed <i>svp null</i> mutant plants over those not exposed to males. Our research underscores the dual role of the phytoplasma effector SAP54 in host development alteration and vector attraction - integral to the phytoplasma life cycle. Importantly, we clarify how SAP54, by targeting SVP, heightens leaf vulnerability to leafhopper males, thus facilitating female attraction and subsequent plant colonization by the insects. SAP54 essentially acts as a molecular 'matchmaker', helping male leafhoppers more easily locate mates by degrading SVP-containing complexes in leaves. This study not only provides insights into the long reach of single parasite genes in extended phenotypes, but also opens avenues for understanding how transcription factors that regulate plant developmental processes intersect with and influence plant-insect interactions.</p>","PeriodicalId":11640,"journal":{"name":"eLife","volume":"13 ","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11706604/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142946451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
eLifePub Date : 2025-01-07DOI: 10.7554/eLife.100928
Masroor Ahmad Paddar, Fulong Wang, Einar S Trosdal, Emily Hendrix, Yi He, Michelle R Salemi, Michal Mudd, Jingyue Jia, Thabata Duque, Ruheena Javed, Brett S Phinney, Vojo Deretic
{"title":"Noncanonical roles of ATG5 and membrane atg8ylation in retromer assembly and function.","authors":"Masroor Ahmad Paddar, Fulong Wang, Einar S Trosdal, Emily Hendrix, Yi He, Michelle R Salemi, Michal Mudd, Jingyue Jia, Thabata Duque, Ruheena Javed, Brett S Phinney, Vojo Deretic","doi":"10.7554/eLife.100928","DOIUrl":"10.7554/eLife.100928","url":null,"abstract":"<p><p>ATG5 is one of the core autophagy proteins with additional functions such as noncanonical membrane atg8ylation, which among a growing number of biological outputs includes control of tuberculosis in animal models. Here, we show that ATG5 associates with retromer's core components VPS26, VPS29, and VPS35 and modulates retromer function. Knockout of ATG5 blocked trafficking of a key glucose transporter sorted by the retromer, GLUT1, to the plasma membrane. Knockouts of other genes essential for membrane atg8ylation, of which ATG5 is a component, affected GLUT1 sorting, indicating that membrane atg8ylation as a process affects retromer function and endosomal sorting. The contribution of membrane atg8ylation to retromer function in GLUT1 sorting was independent of canonical autophagy. These findings expand the scope of membrane atg8ylation to specific sorting processes in the cell dependent on the retromer and its known interactors.</p>","PeriodicalId":11640,"journal":{"name":"eLife","volume":"13 ","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11706607/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142946415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Aminoglycoside tolerance in <i>Vibrio cholerae</i> engages translational reprogramming associated with queuosine tRNA modification.","authors":"Louna Fruchard, Anamaria Babosan, Andre Carvalho, Manon Lang, Blaise Li, Magalie Duchateau, Quentin Giai Gianetto, Mariette Matondo, Frederic Bonhomme, Isabelle Hatin, Hugo Arbes, Céline Fabret, Enora Corler, Guillaume Sanchez, Virginie Marchand, Yuri Motorin, Olivier Namy, Valérie de Crécy-Lagard, Didier Mazel, Zeynep Baharoglu","doi":"10.7554/eLife.96317","DOIUrl":"https://doi.org/10.7554/eLife.96317","url":null,"abstract":"<p><p>Tgt is the enzyme modifying the guanine (G) in tRNAs with GUN anticodon to queuosine (Q). <i>tgt</i> is required for optimal growth of <i>Vibrio cholerae</i> in the presence of sub-lethal aminoglycoside concentrations. We further explored here the role of the Q34 in the efficiency of codon decoding upon tobramycin exposure. We characterized its impact on the overall bacterial proteome, and elucidated the molecular mechanisms underlying the effects of Q34 modification in antibiotic translational stress response. Using molecular reporters, we showed that Q34 impacts the efficiency of decoding at tyrosine TAT and TAC codons. Proteomics analyses revealed that the anti-SoxR factor RsxA is better translated in the absence of <i>tgt</i>. RsxA displays a codon bias toward tyrosine TAT and overabundance of RsxA leads to decreased expression of genes belonging to SoxR oxidative stress regulon. We also identified conditions that regulate <i>tgt</i> expression. We propose that regulation of Q34 modification in response to environmental cues leads to translational reprogramming of transcripts bearing a biased tyrosine codon usage. In silico analysis further identified candidate genes which could be subject to such translational regulation, among which DNA repair factors. Such transcripts, fitting the definition of modification tunable transcripts, are central in the bacterial response to antibiotics.</p>","PeriodicalId":11640,"journal":{"name":"eLife","volume":"13 ","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142930896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
eLifePub Date : 2025-01-06DOI: 10.7554/eLife.91204
Timothy J Abreo, Emma C Thompson, Anuraag Madabushi, Kristen L Park, Heun Soh, Nissi Varghese, Carlos G Vanoye, Kristen Springer, Jim Johnson, Scotty Sims, Zhigang Ji, Ana G Chavez, Miranda J Jankovic, Bereket Habte, Aamir R Zuberi, Cathleen M Lutz, Zhao Wang, Vaishnav Krishnan, Lisa Dudler, Stephanie Einsele-Scholz, Jeffrey L Noebels, Alfred L George, Atul Maheshwari, Anastasios Tzingounis, Edward C Cooper
{"title":"Plural molecular and cellular mechanisms of pore domain <i>KCNQ2</i> encephalopathy.","authors":"Timothy J Abreo, Emma C Thompson, Anuraag Madabushi, Kristen L Park, Heun Soh, Nissi Varghese, Carlos G Vanoye, Kristen Springer, Jim Johnson, Scotty Sims, Zhigang Ji, Ana G Chavez, Miranda J Jankovic, Bereket Habte, Aamir R Zuberi, Cathleen M Lutz, Zhao Wang, Vaishnav Krishnan, Lisa Dudler, Stephanie Einsele-Scholz, Jeffrey L Noebels, Alfred L George, Atul Maheshwari, Anastasios Tzingounis, Edward C Cooper","doi":"10.7554/eLife.91204","DOIUrl":"https://doi.org/10.7554/eLife.91204","url":null,"abstract":"<p><p><i>KCNQ2</i> variants in children with neurodevelopmental impairment are difficult to assess due to their heterogeneity and unclear pathogenic mechanisms. We describe a child with neonatal-onset epilepsy, developmental impairment of intermediate severity, and <i>KCNQ2</i> G256W heterozygosity. Analyzing prior KCNQ2 channel cryoelectron microscopy models revealed G256 as a node of an arch-shaped non-covalent bond network linking S5, the pore turret, and the ion path. Co-expression with G256W dominantly suppressed conduction by wild-type subunits in heterologous cells. Ezogabine partly reversed this suppression. <i>Kcnq2</i><sup>G256W/+</sup> mice have epilepsy leading to premature deaths. Hippocampal CA1 pyramidal cells from G256W/+ brain slices showed hyperexcitability. G256W/+ pyramidal cell KCNQ2 and KCNQ3 immunolabeling was significantly shifted from axon initial segments to neuronal somata. Despite normal mRNA levels, G256W/+ mouse KCNQ2 protein levels were reduced by about 50%. Our findings indicate that G256W pathogenicity results from multiplicative effects, including reductions in intrinsic conduction, subcellular targeting, and protein stability. These studies provide evidence for an unexpected and novel role for the KCNQ2 pore turret and introduce a valid animal model of <i>KCNQ2</i> encephalopathy. Our results, spanning structure to behavior, may be broadly applicable because the majority of <i>KCNQ2</i> encephalopathy patients share variants near the selectivity filter.</p>","PeriodicalId":11640,"journal":{"name":"eLife","volume":"13 ","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142930904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
eLifePub Date : 2025-01-06DOI: 10.7554/eLife.97179
Ziyue Zhou, Su Young Han, Maria Pardo-Navarro, Ellen G Wall, Reena Desai, Szilvia Vas, David J Handelsman, Allan E Herbison
{"title":"GnRH pulse generator activity in mouse models of polycystic ovary syndrome.","authors":"Ziyue Zhou, Su Young Han, Maria Pardo-Navarro, Ellen G Wall, Reena Desai, Szilvia Vas, David J Handelsman, Allan E Herbison","doi":"10.7554/eLife.97179","DOIUrl":"https://doi.org/10.7554/eLife.97179","url":null,"abstract":"<p><p>One in ten women in their reproductive age suffer from polycystic ovary syndrome (PCOS) that, alongside subfertility and hyperandrogenism, typically presents with increased luteinizing hormone (LH) pulsatility. As such, it is suspected that the arcuate kisspeptin (ARN<sup>KISS</sup>) neurons that represent the GnRH pulse generator are dysfunctional in PCOS. We used here in vivo GCaMP fiber photometry and other approaches to examine the behavior of the GnRH pulse generator in two mouse models of PCOS. We began with the peripubertal androgen (PPA) mouse model of PCOS but found that it had a reduction in the frequency of ARN<sup>KISS</sup> neuron synchronization events (SEs) that drive LH pulses. Examining the prenatal androgen (PNA) model of PCOS, we observed highly variable patterns of pulse generator activity with no significant differences detected in ARN<sup>KISS</sup> neuron SEs, pulsatile LH secretion, or serum testosterone, estradiol, and progesterone concentrations. However, a machine learning approach identified that the ARN<sup>KISS</sup> neurons of acyclic PNA mice continued to exhibit cyclical patterns of activity similar to that of normal mice. The frequency of ARN<sup>KISS</sup> neuron SEs was significantly increased in algorithm-identified 'diestrous stage' PNA mice compared to controls. In addition, ARN<sup>KISS</sup> neurons exhibited reduced feedback suppression to progesterone in PNA mice and their gonadotrophs were also less sensitive to GnRH. These observations demonstrate the importance of understanding GnRH pulse generator activity in mouse models of PCOS. The existence of cyclical GnRH pulse generator activity in the acyclic PNA mouse indicates the presence of a complex phenotype with deficits at multiple levels of the hypothalamo-pituitary-gonadal axis.</p>","PeriodicalId":11640,"journal":{"name":"eLife","volume":"13 ","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142930901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}