Biology subjects

Bao, Q.

Publications and source records attributed to Bao, Q..

9 recordsLinked to original sources

bioRxiv2026

Establishment of Integration-Free iPSCs from Diverse Porcine Species: A Novel Resource for Conservation and African Swine Fever Research

The accelerating biodiversity crisis, compounded by emerging infectious diseases like African swine fever (ASF), necessitate innovative conservation and disease management. ASF susceptibility varies wildly across species, from near-100% mortality in Asian suids to asymptomatic carriage in African forest species. We report the first successful derivation of integration-free induced pluripotent stem cells (iPSCs) from four phylogenetically distinct species: wild boar (Sus scrofa), Bornean bearded pig (Sus barbatus), Babirusa (Babyrousa babyrussa), and Red river hog (Potamochoerus porcus). Using Sendai virus-mediated reprogramming, we achieved efficiencies between 0.003% and 0.26%. These iPSCs were successfully differentiated into CD14CD11b monocytes - the primary target cells for the ASF virus - establishing a renewable, comparative research platform. This system enables host-pathogen studies previously hindered by ethical and logistical constraints of wildlife sampling. Beyond disease research, these iPSC lines serve as vital genetic repositories for endangered suids. Our methodology provides a replicable framework for extending stem cell technology to other conservation-priority taxa, demonstrating how high-tech cellular tools can advance both fundamental research and biodiversity preservation against emerging pathogen threats.

cell biology↗

bioRxiv2025

Antibacterial Activity of the Natural Product Elaiophylin against Streptococcus suis and its Biofilm Eradication Effect

The multidrug resistance (MDR) problem in Streptococcus suis(S. suis) is becoming increasingly severe, necessitating the development of novel antibacterial agents and strategies. In this study, seven Elaiophylin derivatives were isolated from Streptomyces sp. WS-30248, and the antibacterial activity and mechanism of action of the principal compound, Elaiophylin, against S. suis were systematically evaluated for the first time. Through comprehensive approaches including in vitro efficacy assays, biofilm inhibition and eradication tests, bacterial membrane integrity analysis, reactive oxygen species (ROS) level detection, and a mouse infection model, Elaiophylin was found to exhibit significant antibacterial activity against multiple clinically MDR S. suis strains. Its minimum inhibitory concentration (MIC) was as low as 0.5 g/mL, and complete bactericidal activity was achieved within 24 hours at 4xMIC. The compound effectively inhibited and eradicated bacterial biofilms, directly killing embedded cells within the biofilm matrix. Mechanistic studies revealed that Elaiophylin functions through multiple synergistic pathways, including disruption of bacterial membrane integrity and induction of massive ROS accumulation, thereby interfering with the proton motive force (PMF), depleting intracellular ATP, and blocking energy metabolism. In the mouse infection model, the Elaiophylin-treated group showed a significantly increased survival rate of 60% and effectively reduced bacterial loads in tissues. This study demonstrates that Elaiophylin is a highly promising natural candidate drug with multi-target synergistic effects, offering a new strategy to combat MDR S. suis and biofilm-associated infections.

microbiology↗

bioRxiv2025

Efficient in vivo pharmacological inhibition of deltaFOSB, an AP1 transcription factor, in brain

{Delta}FOSB, an unusually stable member of the AP1 family of transcription factors, mediates long-term maladaptations that play a key role in the pathogenesis of drug addiction, cognitive decline, dyskinesias, and several other chronic neurological and psychiatric conditions. We have recently identified that 2-phenoxybenzenesulfonic acid-containing compounds disrupt the binding of {Delta}FOSB to DNA in vitro in cell-based assays, and one such compound, JPC0661, disrupts {Delta}FOSB binding to genomic DNA in vivo in mouse brain with partial efficiency. JPC0661 binds to a groove outside of the DNA-binding cleft of the {Delta}FOSB/JUND bZIP heterodimer in the co-crystal structure. Here, we generated a panel of analogs of JPC0661 with the goal of establishing structure-activity relationships and improving its in vivo efficacy by replacing the amino-pyrazolone cap moiety with various substituents. We show that one such analog, YL0441, disrupts the binding of {Delta}FOSB to DNA in vitro and in vivo, and suppresses {Delta}FOSB-function in cell-based assays. Importantly, infusion of YL0441 into the hippocampus of APP mice (a mouse model for Alzheimers disease) leads to virtually complete loss of {Delta}FOSB bound to genomic DNA by CUT&RUN sequencing. Our findings corroborate that DNA binding/release of AP1 transcription factors can be controlled via small molecules, even by analogs of a compound that binds to a groove outside of the DNA-binding cleft, and that our lead can be optimized via medicinal chemistry to yield a highly efficacious inhibitor of {Delta}FOSB function in vivo. These findings define a strategy to design small-molecule inhibitors for other AP1- and AP1-related transcription factors. IN BRIEFWe demonstrate the creation of a highly effective inhibitor, YL0441, of {Delta}FOSB, an AP1 transcription factor, which decreases the number of {Delta}FOSB-bound sites to genomic DNA by [~]94% upon in vivo infusion to the hippocampus of APP mice, a mouse model for Alzheimers disease. This work generates a highly novel probe compound to assess the therapeutic value of {Delta}FOSB in vivo, a transcription factor with a critical role in mediating long-term changes in gene expression in several neuropsychiatric disorders in addition to Alzheimers disease, including drug addiction, seizure-related cognitive decline, and dyskinesias.

neuroscience↗

bioRxiv2024

Endogenous retroviruses activate MARCO-mediated inflammatory response to block retroviral infection

Endogenous retroviruses (ERVs) are remnants of ancient retroviral infections and can profoundly affect the host antiviral innate immune response, although the mechanisms by which these changes occur are largely unknown. Here we report that chicken-specific ERVs exert genetic resistance to exogenous retrovirus infection. Mechanistically, chicken-specific ERVs activated the scavenger receptor MARCO (macrophage receptor with collagenous structure)-mediated TLR3-IL-1{beta} inflammatory response in macrophages. Under the presence of MARCO, macrophages response to viral infection through inducing TLR3-IL-1{beta} inflammatory response. Conversely, lack of MARCO increased the viral replication levels and attenuated the antiviral inflammatory response. MARCO-mediated ligand delivery enhances TLR3-IL-1{beta} antiviral response, and IL-1{beta} expression is responsible for viral inhibition. Restoring MARCO or IL-1{beta} expression overcomes viral infection in macrophages. Our study provides new insights into the molecular mechanisms underlying the host defense against exogenous retroviruses infection and may have important implications for the development of novel therapeutic strategies against retroviruses infection.

immunology↗

bioRxiv2023

Genomic insights into post-domestication expansion and selection of body size in ponies

Horses domestication revolutionized human civilization by changing transportation, farming, and warfare patterns. Despite extensive studies on modern domestic horse origins, the intricate demographic history and genetic signatures of pony size demand further exploration. Here, we present a high-quality genome of the Chinese Debao pony and extensively analyzed 385 individuals from 49 horse breeds. We reveal the conservation of ancient components in East Asian horses and close relationships between Asian horses and specific European pony lineages. Genetic analysis uncovers Asian paternal origin for European pony breeds, and these pony-sized horses share a close genetic affinity due to the presence of a potential ancestral ghost pony population. Additionally, we identify promising cis-regulatory elements influencing horse withers height by regulating genes like RFLNA and FOXO1. Overall, our study provides insightful perspectives into the development history and genetic determinants underlying body size in ponies and offers broader implications for horse population management and improvement. TeaserDecoding pony genetics: exploring origins and size determinants sheds light on their historical and biological impacts.

genomics↗

bioRxiv2022

Treatment history shapes the evolution of complex carbapenem-resistant phenotypes in Klebsiella spp.

Antibiotic resistance is driven by selection, but how a bacterial strains evolutionary history shapes drug-resistance remains an open question. Here we reconstruct the genetic and evolutionary mechanisms of carbapenem resistance in a clinical isolate of Klebsiella. A combination of short and long read sequencing, machine learning, genetic and enzymatic analyses established that this carbapenem-resistant strain carries no carbapenemase-encoding genes. Genetic reconstruction of the resistance phenotype confirmed that two distinct genetic loci are necessary for the strain to acquire carbapenem resistance. Experimental evolution of the carbapenem-resistant strains in growth conditions without the antibiotic revealed that both loci confer a significant cost, and are readily lost by de novo mutation resulting in the rapid evolution of a carbapenem-sensitive phenotype. Thus, historical contingency - a patients treatment history - can shape the evolution of antibiotic resistance and suggests that the strategic combinations of antibiotics could direct the evolution of low-fitness, drug-resistant genotypes.

microbiology↗

bioRxiv2022

DiSCs: Domains involving SETDB1 and Cohesin are critical regulators of genome topology and stem cell fate

SETDB1 is a key regulator of lineage-specific genes and endogenous retroviral elements (ERVs) through its deposition of repressive H3K9me3 mark. Apart from its H3K9me3 regulatory role, SETDB1 has seldom been studied in terms of its other potential regulatory roles. To investigate this, a genomic survey of SETDB1 binding in mouse embryonic stem cells across multiple libraries was conducted, leading to the unexpected discovery of regions bereft of common repressive histone marks (H3K9me3, H3K27me3). These regions were enriched with the CTCF motif that is often associated with the topological regulator Cohesin. Further profiling of these non-H3K9me3 regions led to the discovery of a cluster of non-repeat loci that were co-bound by SETDB1 and Cohesin. These regions, which we named DiSCs (Domains involving SETDB1 and Cohesin) were seen to be proximal to the gene promoters involved in embryonic stem cell pluripotency and lineage development. Importantly, it was found that SETDB1-Cohesin co-regulate target gene expression and genome topology at these DiSCs. Depletion of SETDB1 led to localized dysregulation of Cohesin binding thereby locally disrupting topological structures. Dysregulated gene expression trends revealed the importance of this cluster in ES cell maintenance as well as at gene islands that drive differentiation to other lineages. The unearthing of the DiSCs thus unravels a unique topological and transcriptional axis of control regulated chiefly by SETDB1.

genomics↗

bioRxiv2021

Molecular mechanism of the anti-lung cancer effect of Jin Ning Fang based on network pharmacology and experimental verification

BackgroundJin Ning Fang (JNF) is widely used as an adjuvant therapy for lung cancer. However, its molecular mechanism against lung cancer is still unclear. MethodsThe chemical compounds JNF were screened from the TCMSP database and its target proteins were then predicted. The genes related to lung cancer were collected from the CTD and DisGeNET databases. Next, targets were integrated with disease-related genes to obtain candidate genes. Functional enrichment and protein-protein interaction (PPI) analysis were also performed, followed by construction of pharmacological network. Meanwhile, Autodock was used to assess the affinity between targets and compound. Finally, the anti-cancer effect of JNF on lung cancer cells was detected and some predicted key genes was validated by using real-time PCR. ResultsTwenty-five overlapping targets were obtained, and pathway analysis showed that JNF might exert its anti-cancer function by regulating some biological pathways, such as apoptosis pathway. PPI and pharmacological network revealed several core targets (such as AKT1, AR, and ESR1) and three compounds (quercetin, calcium carbonate, and beta-sitosterol). Then, beta-sitosterol had a high affinity with AKT1, AR, and ESR1. Further in vitro experiments confirmed that JNF could inhibit proliferation and promote apoptosis of A549 cells. The expression of FDPS, PIM1, VCAM1, SLC29A1, NQO1, and ESR1 were significantly decreased, while mRNA level of AR and ANPEP were markedly increased after JNF treatment. ConclusionJNF may exert anti-lung cancer effect through multiple targets and pathways, and identified genes may be used as potential biomarkers for diagnosis and treatment of lung cancer.

cancer biology↗

bioRxiv2020

Chemoproteomics Maps Glycolytic Targetome in Cancer Cells

Hyperactivated glycolysis, favoring uncontrolled growth and metastasis by producing essential metabolic intermediates engaging bioenergetics and biosynthesis, is a metabolic hallmark of most cancer cells. Although sporadic information has revealed glycolytic metabolites also possess non-metabolic function as signaling molecules, it remains largely elusive how these metabolites interact with and functionally regulate their binding targets. Here we introduce a Target Responsive Accessibility Profiling (TRAP) approach that measures ligand binding-induced steric hindrance in protein targets via global profiling accessibility changes in reactive lysines, and mapped 913 target candidates and 2,487 interactions for 10 major glycolytic metabolites in cancer cells via TRAP. The elucidated targetome uncovers diverse regulatory modalities of glycolytic metabolites involving the direct perturbation of carbohydrate metabolism enzymes, intervention of transcriptional control, modulation of proteome-level acetylation and protein complex assemblies. The advantages gained from glycolysis by cancer cells are expanded by discovering lactate as a ligand for an orphan transcriptional regulator TRIM 28 that promotes p53 degradation, and by identifying pyruvate acting against a cell apoptosis inducer trichostatin A via attenuating protein acetylation. Lastly, the inhibition of glycolytic key enzymes led to identify an intrinsically active glycolytic intermediate glyceraldehyde 3-phosphate that elicits its cytotoxicity by engaging with ENO1 and MTHFD1. Collectively, the glycolytic targetome depicted by TRAP constitutes a fertile resource for understanding how glycolysis finely tunes metabolism and signaling in support of cancer cells, and fostering the exploitation of glycolytic targetome as promising nodes for anti-cancer therapeutics development.

cancer biology↗