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Topic10.19测试
测试
TopicEEEEE
🧬 生物信息展示页 🧬生物数据表格 + 花里胡哨渐变矩形模块生物名称分类栖息地特点蓝鲸哺乳纲大洋海域现存最大动物银杏裸子植物温带山林活化石植物灯塔水母水螅纲热带海洋理论可永生大王花被子植物热带雨林花朵巨大动物界异养、可运动，细胞无细胞壁植物界自养光合，拥有细胞壁叶绿体微生物细菌真菌，个体微小繁殖快生物分类表格｜发光渐变矩形｜深海蓝背景｜霓虹文字
TopicSevere acute Respiratory Syndrome Coronavirus (SARS-CoV) Research
The full name of the severe acute respiratory syndrome coronavirus is Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV).
TopicCHO Cell Protein Expression Industrial Application
CHO cells are epithelial cells derived from the ovary of the Chinese hamster (Cricetulus griseus).
TopicTEST11
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Under physiological conditions, cells maintain intracellular Na⁺ homeostasis via Na⁺/K⁺‑ATPase, Na⁺/H⁺ exchanger 1 (NHE1), voltage‑gated sodium channels (Nav), transient receptor potential channel TRPM4 and other transporters. Abnormal activation or impairment of these ion regulatory systems triggers sustained Na⁺ influx and elevates cytoplasmic Na⁺ concentrations. This forces Na⁺/K⁺‑ATPase to continuously consume ATP to sustain ionic gradients, eventually resulting in severe energy depletion. Once sodium accumulation exceeds cellular buffering capacity, osmotic equilibrium collapses, massive water influx occurs, leading to cellular swelling, organelle distension and disrupted plasma membrane integrity, presenting typical necrotic morphological features.Meanwhile, sodium overload provokes secondary Ca²⁺ influx via reverse‑mode operation of the Na⁺/Ca²⁺ exchanger (NCX), aggravating mitochondrial Ca²⁺ burden, loss of mitochondrial membrane potential, reactive oxygen species (ROS) accumulation and mitochondrial functional failure. Furthermore, Na⁺‑mediated cellular stress initiates lysosomal injury and inflammatory signaling cascades, including CTSB release, NLRP3 inflammasome activation and GSDMD‑dependent pore formation, which further amplify cell lysis and inflammatory responses. Accordingly, the execution cascade of NECSO can be summarized as: disrupted Na⁺ homeostasis → ATP depletion → osmotic collapse → secondary Ca²⁺ overload → mitochondrial damage → inflammatory necrosis.NECSO Mechanism Diagram. Necrosis by sodium overload (NECSO) is initiated by massive Na⁺ influx and disrupted sodium homeostasis, triggering ATP depletion and osmotic collapse. Subsequently, Na⁺/Ca²⁺ exchanger (NCX)‑mediated calcium overload, mitochondrial dysfunction and amplified inflammatory signaling cascades occur, ultimately leading to necrotic plasma membrane rupture.1.2 Target ListMechanism ModuleTarget (Gene/Protein)Full NameBiological FunctionMechanism in Na⁺‑dependent Cell DeathResearch Value / Detection IndexNa⁺ Overload (Core Event)TRPM4Transient receptor potential melastatin 4Calcium‑activated non‑selective cation channel mediating Na⁺ influxExcessive activation promotes Na⁺ entry and intracellular Na⁺ accumulationMarker of Na⁺ influx activationNav1.5 (SCN5A)Sodium voltage‑gated channel alpha subunit 5Voltage‑gated sodium channel responsible for Na⁺ transportIncreased sodium channel activity contributes to Na⁺ overloadIndicator of sodium channel activationNHE1 (SLC9A1)Sodium/hydrogen exchanger 1Exchanges intracellular H⁺ for extracellular Na⁺ to regulate intracellular pHEnhanced Na⁺/H⁺ exchange increases intracellular Na⁺ accumulationMarker of Na⁺ influx regulationNa⁺/K⁺‑ATPase (ATP1A1)Sodium/potassium‑transporting ATPase alpha‑1 subunitMaintains Na⁺ and K⁺ gradients through ATP‑dependent ion transportInitially compensates for Na⁺ overload by promoting Na⁺ extrusion, but fails during late‑stage injuryIndicator of Na⁺ homeostasis disruptionEnergy Metabolic CollapseATP5AATP synthase F1 subunit alphaCatalyzes ATP synthesis through oxidative phosphorylationMitochondrial dysfunction reduces ATP production capacityMarker of mitochondrial energy failurep‑AMPKPhosphorylated AMP‑activated protein kinaseEnergy stress sensor regulating metabolic adaptationActivated during ATP depletion and cellular energy crisisEnergy stress indicatorCOX4Cytochrome c oxidase subunit 4Component of mitochondrial respiratory Complex IV involved in oxygen consumptionImpaired respiratory chain decreases oxidative phosphorylation efficiencyRespiratory chain damage markerNDUFS1NADH dehydrogenase [ubiquinone] Fe‑S protein 1Core component of mitochondrial Complex I involved in electron transferDysfunction disrupts electron transport and mitochondrial respirationComplex I functional markerNa⁺‑Ca²⁺ Coupled InjuryNCX1 (SLC8A1)Sodium/calcium exchanger 1Exchanges intracellular Ca²⁺ and extracellular Na⁺ to regulate calcium homeostasisReverse‑mode activation promotes Ca²⁺ influx and secondary calcium overloadMarker of Na⁺/Ca²⁺ exchange dysfunctionSERCA2Sarco/endoplasmic reticulum Ca²⁺‑ATPase 2Pumps Ca²⁺ into the endoplasmic reticulum and maintains Ca²⁺ homeostasisReduced activity contributes to intracellular Ca²⁺ accumulationCalcium homeostasis markerMitochondrial InjuryJC‑1 / TMREMitochondrial membrane potential fluorescent probesDetect mitochondrial membrane potential (ΔΨm)Na⁺ overload induces mitochondrial depolarization and dysfunctionDetection of mitochondrial membrane potential lossROS / MitoSOXReactive oxygen species / mitochondrial superoxide indicatorDetect mitochondrial oxidative stressMitochondrial dysfunction increases ROS productionOxidative stress indicatorHMOX1Heme oxygenase 1Antioxidant enzyme involved in cellular stress responseActivated as a protective response to oxidative stressOxidative stress response markerNQO1NAD(P)H quinone dehydrogenase 1Antioxidant and detoxification enzymeReflects activation of cellular antioxidant defenseAntioxidant response markerTOM20Translocase of outer mitochondrial membrane 20Mediates mitochondrial protein import and reflects mitochondrial integrityAltered distribution indicates mitochondrial structural damageMitochondrial integrity marker COX4Cytochrome c oxidase subunit 4Maintains respiratory Complex IV functionReduced expression reflects mitochondrial respiratory injuryMitochondrial damage markerOsmotic Collapse (NECSO Hallmark Event)Cell swellingCellular volume expansionMorphological consequence of ionic imbalanceNa⁺ accumulation drives osmotic water influx and cellular swellingHallmark morphological featurePI uptakePropidium iodide uptakeDetects loss of membrane integrityIncreased membrane permeability occurs during terminal necrotic damageCell death validation markerLDH releaseLactate dehydrogenase releaseReflects plasma membrane ruptureIndicates terminal necrotic membrane damageNecrotic cell death markerLysosomal DamageCTSBCathepsin BLysosomal cysteine protease involved in protein degradationLysosomal injury causes CTSB release and amplifies cell death signalingMarker of lysosomal membrane damageInflammatory AmplificationNLRP3NLR family pyrin domain containing 3Forms inflammasome complexes in response to cellular stressActivation promotes inflammatory cell death signalingInflammasome activation markerCaspase‑1Cysteine‑aspartic acid protease 1Inflammatory caspase responsible for IL‑1β/IL‑18 maturationActivation promotes inflammatory amplificationMarker of inflammasome activationGSDMD‑NGasdermin D N‑terminal domainForms membrane pores after GSDMD cleavageMediates membrane rupture and inflammatory cell death executionPyroptosis‑like execution markerDAMP Release / Terminal NecrosisHMGB1High mobility group box 1 proteinNuclear DNA‑binding protein released during necrotic cell deathRelease indicates inflammatory necrosis and DAMP signalingDAMP release markerIL‑1βInterleukin‑1 betaPro‑inflammatory cytokineIncreased secretion reflects inflammatory activationInflammatory output markerIL‑18Interleukin‑18Cytokine involved in immune activationReleased during inflammasome‑associated cell deathInflammatory cytokine marker1.3 Application SchemeJudgement PurposeRecommended Marker PanelNa⁺ overloadNa⁺ probe + TRPM4 + NHE1Disrupted ion homeostasisNa⁺/K⁺‑ATPase + NCX1Secondary Ca²⁺ injuryCa²⁺ probe + NCX1Mitochondrial damageROS + ΔΨm + COX4/ATP5ANecrosis occurrenceLDH + PI + HMGB1Inflammatory amplificationNLRP3 + GSDMD‑N1.4 ReferencesHu H, Chen Z, Li Y, Peng J, Cao J, Zhou H, Wang M, Du Y, Wu H, Zhao H, Huang S, Yu D, Liu M, Shevchenko OV, Matveeva NY, Yang Y, Huang K, Lv D, Min J, Chen L, Wang F. Metal‑dependent regulated cell death: Molecular architecture and translational frontiers. Imeta. 2026 Jul 6;5(3):e70141. doi: 10.1002/imt2.70141. PMID: 42491529; PMCID: PMC13377419.```
TopicTEST
```.antibody-faq-wrap { width: 100%; box-sizing: border-box; margin:20px 0; font-family: "Noto Sans", system-ui, -apple-system, BlinkMacSystemFont, sans-serif; line-height:1.65; color:#222; background:#fff; padding:24px; border-radius:8px; border:1px solid #dcd4ec; } .antibody-faq-wrap * { box-sizing: border-box; } .antibody-faq-wrap h1 { font-size:26px; color:#3a2463; margin-bottom:16px; } .antibody-faq-wrap h2 { font-size:22px; color:#4b3078; padding-bottom:6px; border-bottom:2px solid #dcd4ec; margin:28px 0 12px; } .antibody-faq-wrap h3 { font-size:18px; color:#5c3e8c; margin:20px 0 10px; } .antibody-faq-wrap p { margin-bottom:12px; } .antibody-faq-wrap ul { margin-left:24px; margin-bottom:14px; } .antibody-faq-wrap table { width:100%; border-collapse:collapse; margin:16px auto 22px; box-shadow:0 1px 4px rgba(0,0,0,0.08); } .antibody-faq-wrap th { background:#5c3e8c; color:#ffffff; padding:9px 12px; text-align:left; word-break:break-word; } .antibody-faq-wrap td { padding:9px 12px; border:1px solid #e2e2e2; vertical-align:top; word-break:break-word; } .antibody-faq-wrap tr:nth-child(even) td { background:#f6f4fa; } /* ========== FAQ手风琴：鼠标悬停在整个问题区块就展开 ========== */ .faq-acc-item { margin-bottom:8px; } .faq-acc-title { display:block; background:#edeaf7; color:#4b3078; font-size:17px; font-weight:500; padding:14px 20px; border:1px solid #dcd4ec; border-radius:8px; position:relative; margin-bottom:0; transition: background 0.22s ease, border-radius 0.22s ease; } /* 移入整个item：标题样式变化 */ .faq-acc-item:hover .faq-acc-title { background:#ffffff; border-radius:8px 8px 0 0; border-bottom:none; } .faq-acc-title::after { content:"+"; position:absolute; right:20px; top:50%; transform:translateY(-50%); font-size:22px; line-height:1; } .faq-acc-item:hover .faq-acc-title::after { content:"−"; } .faq-acc-content { max-height:0; overflow:hidden; border:1px solid #dcd4ec; border-top:none; border-radius:0 0 8px 8px; background:#fff; transition: max-height 0.5s ease, padding 0.5s ease; padding:0 20px; margin-top:-1px; } /* ✅关键：hover父级.faq‑acc‑item，标题+内容同时生效 */ .faq-acc-item:hover .faq-acc-content { max-height:12000px; padding:20px 20px; overflow-y:auto; } Antibody Validation & FAQsAntibody selection is the single most critical factor for CUT&Tag success. However, buffer conditions, incubation time, Tn5 activity, and cell integrity also significantly impact results. This guide focuses on antibody‑related considerations.For the most up‑to‑date list of available products, please visit our antibody product page.1. Antibody Selection PrinciplesFollow this prioritization hierarchy:PriorityAntibody TypeRecommendation1stCUT&Tag‑validatedDemonstrated performance in CUT&Tag assays; validated with positive and negative controls.2ndCUT&RUN‑validatedThe buffer conditions and epitope accessibility in CUT&RUN closely resemble CUT&Tag, making these antibodies a reliable fallback.3rdNative ChIP‑validated (N‑ChIP)Likely to perform well only if validated in unfixed ChIP; crosslink‑dependent (X‑ChIP) antibodies often fail in CUT&Tag.Not recommendedWestern blot‑only (WB‑validated)WB detects denatured linear epitopes; such antibodies rarely recognize native chromatin epitopes in CUT&Tag.2. Antibody Selection by Target TypeTarget TypeRecommendationsHistone modificationsTypically easier to validate; many commercial CUT&Tag‑grade antibodies are available for H3K4me3, H3K27me3, H3K27ac, H3K9me3, etc.Transcription factorsDemand higher validation standards due to lower abundance and weaker binding; prioritize CUT&Tag/CUT&RUN‑validated antibodies.Tagged proteins (HA/Flag/GFP)An effective alternative when no reliable antibody exists for the endogenous protein. Tag‑specific antibodies are often well‑validated and provide consistent performance. Note: overexpression of tagged constructs must be validated to ensure the fusion protein retains native localization and binding function.3. ControlsInclude the following controls in every experiment:Control TypeAntibodyPurposePositive control (histone mark)Anti‑H3K4me3Confirms assay activity in active promoter regions; universally active across most cell types.Positive control (repressive mark)Anti‑H3K27me3Confirms assay activity in repressed regions; especially valuable in developmental or stem‑cell studies.Positive control (TF, optional)Anti‑CTCFA stable, ubiquitously expressed transcription factor; expression varies across cell lines—verify for your system, or use H3K4me3 as primary positive control.Negative controlNormal IgG (species‑ and isotype‑matched to the primary antibody)Establishes background signal; essential for peak calling and removing non‑specific enrichment.Normalization control (optional)Spike‑in (e.g., Drosophila chromatin)Required for quantitative comparisons across multiple samples; can be omitted for single‑sample routine profiling.4. Frequently Asked Questions (FAQs)Q1: What should I do if no CUT&Tag‑validated antibody is available for my target?Consider CUT&RUN‑validated antibodies as the next best choice. If neither exists, test a native ChIP‑grade antibody with a small‑scale CUT&Tag experiment (50,000–100,000 cells per test condition to conserve reagent and material). Alternatively, use an epitope‑tagged (HA/Flag/GFP) version of your target, provided the tagged construct is confirmed to retain native chromatin binding.Q2: Can I use a Western blot‑grade antibody for CUT&Tag?Generally not recommended. WB antibodies recognize denatured linear epitopes, whereas CUT&Tag requires antibodies that bind native, unfixed chromatin epitopes. WB‑grade antibodies seldom perform well in CUT&Tag.Q3: How do I determine if an antibody is suitable for CUT&Tag?Check the supplier's validation data. Look for:Direct mention of CUT&Tag, CUT&RUN, or native ChIP validationPerformance data with positive and negative controlsA clear recommended dilution for chromatin applicationsIf in doubt, perform a small‑scale test run with positive and negative control antibodies in parallel.Q4: What is the role of the secondary antibody in CUT&Tag?CUT&Tag uses a secondary antibody for signal amplification. The primary antibody binds the target protein, and the secondary antibody (unmodified, raised against the primary antibody species) is added to recruit additional pA/G‑Tn5 transposase molecules to the target site. The pA/G‑Tn5 fusion protein binds to the Fc regions of both primary and secondary antibodies. Species and isotype matching are therefore important considerations. For specialized applications (e.g., nanobody‑Tn5 conjugates), the secondary step may be bypassed, but this is not the standard CUT&Tag workflow.Special note for mouse IgG1 primary antibodies: Standard Protein A/G‑Tn5 fusion proteins have relatively low affinity for the mouse IgG1 Fc region. When using mouse IgG1 primary antibodies, ensure that the secondary antibody is specifically selected to bridge this interaction effectively, or use a primary antibody of a species/isotype more efficiently recognized by Protein A/G.Q5: How should antibody concentration be optimized?Start with the supplier's recommended dilution for native ChIP or CUT&Tag. If no recommendation exists, test a dilution range (e.g., 1:25, 1:50, 1:100, 1:200) with a positive control antibody. Higher concentration may increase background; lower concentration may reduce signal. Optimal concentration balances peak enrichment with low background noise.Q6: What if my target is a histone modification not on the validated antibody list?Many histone PTMs share similar validation behavior. A native ChIP‑grade antibody against the same modification can serve as a reference. However, some modification antibodies depend on crosslinking to stabilize epitopes—an X‑ChIP‑validated antibody may still fail in native CUT&Tag. A small‑scale test is always recommended.Q7: Monoclonal vs. polyclonal antibody—which is better for CUT&Tag?Both can work. Monoclonal antibodies offer high specificity and lot‑to‑lot consistency but may fail if the target epitope is masked. Polyclonal antibodies recognize multiple epitopes, providing stronger signal, but batch‑to‑batch variability is higher. For histone modifications, monoclonals are often preferred for consistency; for low‑abundance transcription factors, a validated polyclonal may provide better detection.Q8: How do incubation temperature and duration affect enrichment?Standard CUT&Tag protocols use 2 hours at room temperature or overnight at 4°C for primary antibody binding. Room‑temperature incubation is faster and often sufficient for high‑affinity antibodies. Overnight at 4°C is recommended for low‑abundance targets or antibodies with weaker affinity, as it allows more complete binding. Avoid extended incubation beyond 16 hours, as background may increase.5. Antibody Storage and HandlingAliquot and store: Divide antibodies into small aliquots to minimize degradation and contamination risk. Most commercial antibody preparations contain glycerol (typically 40–50%), which prevents freezing at –20°C; repeated freeze‑thaw cycles are therefore rarely a concern. Store at –20°C in opaque or foil‑wrapped tubes to protect from light. Avoid –80°C unless the supplier specifically recommends it.Sodium azide caution: Sodium azide is a common preservative in antibody preparations. Its primary concern in CUT&Tag is cellular toxicity—residual azide can compromise cell/nuclear membrane integrity before the tagmentation step. Since antibodies are thoroughly washed away before pA/G‑Tn5 is added, direct inhibition of Tn5 is not the main issue. Dialyze or dilute the antibody to reduce azide levels below 0.02%, or select azide‑free formulations when possible.Expiration and quality: Track antibody age and lot numbers. Re‑validate performance periodically, especially after long‑term storage.6. Special Considerations for Difficult TargetsWeakly bound transcription factors: CUT&Tag's high‑salt washes (300 mM NaCl) can disrupt weak factor‑DNA interactions. If a candidate antibody consistently fails, consider the following alternatives:Light crosslinking to stabilize factor‑DNA interactions before permeabilization.Reduced salt concentration during washes (e.g., 150 mM NaCl) to preserve weaker binding, though this may increase background.Switch to CUT&RUN, which uses milder wash conditions by default.Membrane‑associated or transient complexes: Many membrane proteins and transient regulatory complexes are incompatible with CUT&Tag's native, unfixed workflow. For such targets, crosslinking‑based ChIP‑seq remains the preferred approach. However, with the development of formaldehyde crosslinking CUT&Tag (fcCUT&Tag), these challenging targets can now be profiled using the CUT&Tag workflow with a prior crosslinking step, offering an alternative to traditional ChIP‑seq.Core histones vs. histone variants: Most core histone antibodies perform robustly. Histone variant‑specific antibodies (e.g., H3.3, CENP‑A) require careful validation, as their lower abundance and restricted distribution demand higher sensitivity.SummaryAntibody selection for CUT&Tag follows a clear hierarchy: CUT&Tag‑validated > CUT&RUN‑validated > native ChIP‑validated. Always include proper controls (positive, negative, and optional spike‑in) and validate new antibodies with a small‑scale test before committing valuable samples. For targets lacking validated antibodies, epitope‑tagged alternatives or method adjustments (e.g., CUT&RUN) may offer viable paths forward. For a list of antibodies we have validated for CUT&Tag, please visit our antibody product page.```
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