A CRISPR/Cas12a-responsive dual-aptamer DNA network for specific capture and controllable release of circulating tumor cells.

The separation and detection of circulating tumor cells (CTCs) have a significant impact on clinical diagnosis and treatment by providing a predictive diagnosis of primary tumors and tumor metastasis. But the responsive release and downstream analysis of live CTCs will provide more valuable information about molecular markers and functional properties. To this end, specific capture and controllable release methods, which can achieve the highly efficient enrichment of CTCs with strong viability, are urgently needed. DNA networks create a flexible, semi-wet three-dimensional (3D) microenvironment for cell culture, and have the potential to minimize the loss of cell viability and molecular integrity. More importantly, responsive DNA networks can be reasonably designed as smart sensors and devices to change shape, color, disassemble, and giving back to external stimuli. Here, a strategy for specifically collecting cells using a dual-aptamer DNA network is designed. The proposed strategy enables effective capture, 3D encapsulation, and responsive release of CTCs with strong viability, which can be used for downstream analysis of live cells. The programmability of CRISPR/Cas12a, a powerful toolbox for genome editing, is used to activate the responsive release of captured CTCs from the DNA network. After activation by a specified double-strand DNA (dsDNA) input, CRISPR/Cas12a cleaves the single-stranded DNA regions in the network, resulting in molecular to macroscopic changes in the network. Accompanied by the deconstruction of the DNA network into fragments, controllable cell release is achieved. The viability of released CTCs is well maintained and downstream cell analysis can be performed. This strategy uses the enzymatic properties of CRISPR/Cas12a to design a platform to improve the programmability and versatility of the DNA network, providing a powerful and effective method for capturing and releasing CTCs from complex physiological samples.

Risk factor analysis and nomogram development for steatorrhea in idiopathic chronic pancreatitis.

OBJECTIVES: Steatorrhea, a sign of severe pancreatic exocrine insufficiency (PEI), is related to consequences caused by pancreatitis. This study aimed to identify predictors and to construct a nomogram for steatorrhea in idiopathic chronic pancreatitis (ICP). METHODS: ICP patients admitted to our hospital from January 2000 to December 2013 were enrolled in this retrospective-prospective cohort study and randomly assigned to the training and validation cohorts. The cumulative rate of steatorrhea was calculated. A Cox proportional hazard regression model was used to identify predictors for steatorrhea and construct the nomogram. Internal and external validation of the nomogram was then performed. RESULTS: There were 1633 ICP patients enrolled, with a median follow-up duration of 9.8 years and 20.8% (339/1633) of patients developed steatorrhea following onset of ICP. Steatorrhea was observed in 93, 115, and 133 patients at 1, 3, and 5 years following diagnosis of CP, with a cumulative rate of 6.5% (95% confidence interval [CI] 5.1%-7.9%), 8.0% (95% CI 6.2%-9.8%), and 9.3% (95% CI 6.6%-12.0%), respectively. Male sex (hazard ratio [HR] 2.479, P < 0.001), diabetes mellitus at/before diagnosis of ICP (HR 2.274, P = 0.003), and aged less than 18 years at onset of ICP (HR 0.095, P < 0.001) were identified risk factors for steatorrhea. Initial manifestations were associated with development of steatorrhea. The nomogram was proven to have good concordance indexes. CONCLUSIONS: We identified predictors and developed a nomogram for predicting steatorrhea in ICP. It was recommended that high-risk populations be followed up closely, which might contribute to the early diagnosis and treatment of PEI.

"RESET" Effect: Random Extending Sequences Enhance the Trans-Cleavage Activity of CRISPR/Cas12a.

The trans-cleavage activity of CRISPR/Cas12a has been widely used in biosensing applications. However, the lack of exploration on the fundamental properties of CRISPR/Cas12a not only discourages further in-depth studies of the CRISPR/Cas12a system but also limits the design space of CRISPR/Cas12a-based applications. Herein, a "RESET" effect (random extending sequences enhance trans-cleavage activity) is discovered for the activation of CRISPR/Cas12a trans-cleavage activity. That is, a single-stranded DNA, which is too short to work as the activator, can efficiently activate CRISPR/Cas12a after being extended a random sequence from its 3'-end, even when the random sequence folds into secondary structures. The finding of the "RESET" effect enriches the CRISPR/Cas12a-based sensing strategies. Based on this effect, two CRISPR/Cas12a-based biosensors are designed for the sensitive and specific detection of two biologically important enzymes.

MnO2 nanosheets as a carrier and accelerator for improved live-cell biosensing application of CRISPR/Cas12a.

Besides gene-editing, the CRISPR/Cas12a system has also been widely used in in vitro biosensing, but its applications in live-cell biosensing are rare. One reason is lacking appropriate carriers to synchronously deliver all components of the CRISPR/Cas12a system into living cells. Herein, we demonstrate that MnO2 nanosheets are an excellent carrier of CRISPR/Cas12a due to the two important roles played by them. Through a simple mixing operation, all components of the CRISPR/Cas12a system can be loaded on MnO2 nanosheets and thus synchronously delivered into cells. Intracellular glutathione (GSH)-induced decomposition of MnO2 nanosheets not only results in the rapid release of the CRISPR/Cas12a system in cells but also provides Mn2+ as an accelerator to promote CRISPR/Cas12a-based biosensing of intracellular targets. Due to the merits of highly efficient delivery, rapid intracellular release, and the accelerated signal output reaction, MnO2 nanosheets work better than commercial liposome carriers in live-cell biosensing analysis of survivin messenger RNA (mRNA), producing much brighter fluorescence images in a shorter time. The use of MnO2 nanosheets might provide a good carrier for different CRISPR/Cas systems and achieve the rapid and sensitive live-cell biosensing analysis of different intracellular targets, thus paving a promising way to promote the applications of CRISPR/Cas systems in living cells.

Oxidative Cleavage-Based Three-Dimensional DNA Biosensor for Ratiometric Detection of Hypochlorous Acid and Myeloperoxidase.

Methods to detect and quantify disease biomarkers with high specificity and sensitivity in biological fluids play a key role in enabling clinical diagnosis, including point-of-care testing. Myeloperoxidase (MPO) is an emerging biomarker for the detection of inflammation, neurodegenerative diseases, and cardiovascular disease, where excess MPO can lead to oxidative damage to biomolecules in homeostatic systems. While numerous methods have been developed for MPO analysis, most techniques are challenging in clinical applications due to the lack of amplification methods, high cost, or other practical drawbacks. Enzyme-linked immunosorbent assays are currently used for the quantification of MPO in clinical practice, which is often limited by the availability of antibodies with high affinity and specificity and the significant nonspecific binding of antibodies to the analytical surface. In contrast, nucleic acid-based biosensors are of interest because of their simplicity, fast response time, low cost, high sensitivity, and low background signal, but detection targets are limited to nucleic acids and non-nucleic acid biomarkers are rare. Recent studies reveal that the modification of a genome in the form of phosphorothioate is specifically sensitive to the oxidative effects of the MPO/H2O2/Cl- system. We developed an oxidative cleavage-based three-dimensional DNA biosensor for rapid, ratiometric detection of HOCl and MPO in a "one-pot" method, which is simple, stable, sensitive, specific, and time-saving and does not require a complex reaction process, such as PCR and enzyme involvement. The constructed biosensor has also been successfully used for MPO detection in complex samples. This strategy is therefore of great value in disease diagnosis and biomedical research.

Signal amplification and output of CRISPR/Cas-based biosensing systems: A review.

CRISPR (clustered regularly interspaced short palindromic repeats)/Cas (CRISPR-associated) proteins are powerful gene-editing tools because of their ability to accurately recognize and manipulate nucleic acids. Besides gene-editing function, they also show great promise in biosensing applications due to the superiority of easy design and precise targeting. To improve the performance of CRISPR/Cas-based biosensing systems, various nucleic acid-based signal amplification techniques are elaborately incorporated. The incorporation of these amplification techniques not only greatly increases the detection sensitivity and specificity, but also extends the detectable target range, as well as makes the use of various signal output modes possible. Therefore, summarizing the use of signal amplification techniques in sensing systems and elucidating their roles in improving sensing performance are very necessary for the development of more superior CRISPR/Cas-based biosensors for various applications. In this review, CRISPR/Cas-based biosensors are summarized from two aspects: the incorporation of signal amplification techniques in three kinds of CRISPR/Cas-based biosensing systems (Cas9, Cas12 and Cas13-based ones) and the signal output modes used by these biosensors. The challenges and prospects for the future development of CRISPR/Cas-based biosensors are also discussed.

Nonenzymatic catalytic assembly of valency-controlled DNA architectures for nanoparticles and live cell assembly.

The precise control over high-order DNA architecture assembly might be challenging due to complicated circuit design and functional unit synthesis. Here, we show an enzyme-free, catalytic assembly to construct nanometer and micrometer architectures in a bottom-up manner and applied them in nanoparticles and cell assembly.

DNA nanolantern-based split aptamer probes for in situ ATP imaging in living cells and lighting up mitochondria.

Accurate and specific analysis of adenosine triphosphate (ATP) expression levels in living cells can provide valuable information for understanding cell metabolism, physiological activities and pathologic mechanisms. Herein, DNA nanolantern-based split aptamer nanoprobes are prepared and demonstrated to work well for in situ analysis of ATP expression in living cells. The nanoprobes, which carry multiple split aptamer units on the surface, are easily and inexpensively prepared by a "one-pot" assembly reaction of four short oligonucleotide strands. A series of characterization experiments verify that the nanoprobes have good monodispersity, strong biostability, high cell internalization efficiency, and fluorescence resonance energy transfer (FRET)-based ratiometric response to ATP in the concentration range covering the entire intracellular ATP expression level. By changing the intracellular ATP level via different treatments, the nanoprobes are demonstrated to show excellent performance in intracellular ATP expression analysis, giving a highly ATP concentration-dependent ratiometric fluorescence signal output. ATP-induced formation of large-sized DNA aggregates not only amplifies the FRET signal output, but also makes in situ ATP-imaging analysis in living cells possible. In situ responsive crosslinking of nanoprobes also makes them capable of lighting up the mitochondria of living cells. By simply changing the split aptamer sequence, the proposed DNA nanolantern-based split aptamer strategy might be easily extended to other targets.

Optimizing the Protein Fluorescence Reporting System for Somatic Embryogenesis Regeneration Screening and Visual Labeling of Functional Genes in Cotton.

Protein fluorescence reporting systems are of crucial importance to in-depth life science research, providing systematic labeling tools for visualization of microscopic biological activities in vivo and revolutionizing basic research. Cotton somatic cell regeneration efficiency is low, causing difficulty in cotton transformation. It is conducive to screening transgenic somatic embryo using the fluorescence reporting system. However, available fluorescence labeling systems in cotton are currently limited. To optimize the fluorescence reporting system of cotton with an expanded range of available fluorescent proteins, we selected 11 fluorescent proteins covering red, green, yellow, and cyan fluorescence colors and expressed them in cotton. Besides mRuby2 and G3GFP, the other nine fluorescent proteins (mCherry, tdTomato, sfGFP, Clover, EYFP, YPet, mVenus, mCerulean, and ECFP) were stably and intensely expressed in transgenic callus and embryo, and inherited in different cotton organs derive from the screened embryo. In addition, transgenic cotton expressing tdTomato appears pink under white light, not only for callus and embryo tissues but also various organs of mature plants, providing a visual marker in the cotton genetic transformation process, accelerating the evaluation of transgenic events. Further, we constructed transgenic cotton expressing mCherry-labeled organelle markers in vivo that cover seven specific subcellular compartments: plasma membrane, endoplasmic reticulum, tonoplast, mitochondrion, plastid, Golgi apparatus, and peroxisome. We also provide a simple and highly efficient strategy to quickly determine the subcellular localization of uncharacterized proteins in cotton cells using organelle markers. Lastly, we built the first cotton stomatal fluorescence reporting system using stomata-specific expression promoters (ProKST1, ProGbSLSP, and ProGC1) to drive Clover expression. The optimized fluorescence labeling system for transgenic somatic embryo screening and functional gene labeling in this study offers the potential to accelerating somatic cell regeneration efficiency and the in vivo monitoring of diverse cellular processes in cotton.

Terminal deoxynucleotidyl transferase combined CRISPR-Cas12a amplification strategy for ultrasensitive detection of uracil-DNA glycosylase with zero background.

A simple and highly sensitive biosensing strategy was reported by cascading terminal deoxynucleotidyl transferase (TdT)-catalyzed substrate extension and CRISPR-Cas12a -catalyzed short-stranded DNA probe cleavage. Such a strategy, which is named as TdT-combined CRISPR-Cas12a amplification, gives excellent signal amplification capability due to the synergy of two amplification steps, and thus shows great promise in the design of various biosensors. Based on this strategy, two representative biosensors were developed by simply adjusting the DNA substrate design. High signal amplification efficiency and nearly zero background endowed the biosensors with extraordinary high sensitivity. By utilizing these two biosensors, ultrasensitive detection of uracil-DNA glycosylase (UDG) and T4 polynucleotide kinase (T4 PNK) was achieved with the detection limit as low as 5 × 10-6 U/mL and 1 × 10-4 U/mL, respectively. The proposed UDG-sensing platform was also demonstrated to work well for the UDG activity detection in cancer cells as well as UDG screening and inhibitory capability evaluation, thus showing a great potential in clinical diagnosis and biomedical research.

The complete mitochondrial genome of Chrysolina aeruginosa Fald (Coleoptera: Chrysomelidae).

In this study, the first complete mitochondrial genome of Chrysolina aeruginosa Fald was assembled and analyzed. The total length of this mitochondrial genome is 16,335 base pairs. It consists of 13 protein-coding genes, 22 transfer RNAs, two ribosomal RNAs, and an AT-rich region. Phylogenomic analysis indicated that C. aeruginosa Fald is sister to Chrysodinopsis sp. This study provides new molecular data for the further taxonomic and phylogenetic studies of the Chrysomelidae of Coleoptera.

Severe reflux esophagitis and multiple congenital defects: A case report.

INTRODUCTION: Gastroesophageal reflux disease is a common and troublesome condition. This paper reports a rare case of gastroesophageal reflux disease caused by ectopic biliary drainage accompanying the absence of a pyloric channel and duodenal bulb in a female patient with multiple underlying malformations. PATIENT CONCERNS: A 24-year-old female presented with acid regurgitation and abdominal pain for one month. She was born two weeks premature and with blindness of the right eye. Cardiac murmur was detected in the physical examination. DIAGNOSIS: Gastroendoscopy was performed, and a class D reflux esophagitis and ectopic papilla complicated with the absence of a pyloric channel and duodenal bulb were found. Doppler echocardiography further confirmed the defects of atrial and ventricular septa. Trio-based whole exome sequencing was performed on the proband and her family to find the potential association of multiple variations. However, no putative pathogenic mutations were found. INTERVENTIONS: The patient received proton pump inhibitors and prokinetic treatment and underwent surgical repair of septal defects. OUTCOMES: The symptoms were quickly relieved, and the patient was kept stable upon follow-up. CONCLUSION: The combination of an absent pylorus and ectopic papilla is a rare cause of reflux esophagitis. Unusual gastrointestinal anatomical variations may be accompanied by other malformations. Though no remarkable mutation were detected in this case, sequencing is an efficient technique worth full consideration.

CRISPR/Cas12a-based dual amplified biosensing system for sensitive and rapid detection of polynucleotide kinase/phosphatase.

We reported a CRISPR/Cas-based dual amplified sensing strategy for rapid, sensitive and selective detection of polynucleotide kinase/phosphatase (PNKP), a DNA damage repair-related biological enzyme. In this strategy, a PNKP-triggered nicking enzyme-mediated strand displacement amplification reaction was introduced to enrich the activator DNA strands for CRISPR/Cas. Such an isothermal DNA amplification step, together with subsequent activated CRISPR/Cas-catalyzed cleavage of fluorescent-labeled short-stranded DNA probes, enable synergetic signal amplification for sensitive PNKP detection. The proposed strategy showed a wide linear detection range (more than 3 orders of magnitude ranging from 1× 10-5 to 2.5 × 10-2 U/mL T4 PNKP) and a detection limit as low as 3.3 × 10-6 U/mL. It was successfully used for the PNKP activity detection in cell extracts with high fidelity and displayed great potential for enzyme inhibitor screening and inhibitory capability evaluation. This work broadens the applications of CRISPR/Cas12a-based sensors to biological enzymes and provides a way to improve the sensitivity by introducing an isothermal signal amplification step. Such an isothermal DNA amplification-CRISPR/Cas-combined biosensor design concept might expand CRISPR/Cas-based sensing systems and promote their applications in various fields such as disease diagnosis and drug screening.

Risk Factors Analysis and Nomogram Development for Pancreatic Pseudocyst in Idiopathic Chronic Pancreatitis.

OBJECTIVE: The study concerns identifying risk factors and developing nomogram for pancreatic pseudocyst (PPC) in idiopathic chronic pancreatitis (ICP) to facilitate early diagnosis. METHODS: From January 2000 to December 2013, ICP patients admitted to our center were enrolled. Cumulative incidence of PPC was determined by Kaplan-Meier method. Patients were randomized into training group and validation group in a 2:1 ratio. Risk factors of PPC were determined through Cox proportional hazards regression model based on training cohort. The nomogram was constructed according to risk factors. RESULTS: Totally, 1633 ICP patients were included with a median follow-up duration of 9.8 years. Pancreatic pseudocyst was observed in 14.7% (240/1633) of patients after ICP onset. The cumulative incidences of PPC were 8.2%, 10.4%, and 12.9% at 3, 5, and 10 years after ICP onset, respectively. Male sex, smoking history, history of severe acute pancreatitis, and chronic pain at/before diagnosis of ICP and complex pathologic changes in main pancreatic duct were recognized as risk factors of PPC development. The nomogram constructed with these risk factors achieved good concordance indexes. CONCLUSIONS: Risk for PPC could be estimated through the nomogram. High-risk patients were suggested to be followed up closely to help early diagnosis of PPC.

Classification of Early-Onset and Late-Onset Idiopathic Chronic Pancreatitis Needs Reconsideration.

Bimodal classification of idiopathic chronic pancreatitis (ICP) into early-onset (<35 years) and late-onset (>35 years) ICP was proposed in 1994 based on a study of 66 patients. However, bimodal distribution wasn't sufficiently demonstrated. Our objective was to examine the validity and relevance of the age-based bimodal classification of ICP. We analyzed the distribution of age at onset of ICP in our cohort of 1633 patients admitted to our center from January 2000 to December 2013. Classify ICP patients into early-onset ICP(a) and late-onset ICP(a) according to different cut-off values (cut-off value, a = 15, 25, 35, 45, 55, 65 years old) for age at onset. Compare clinical characteristics of early-onset ICP(a) and late-onset ICP(a). We found slightly right skewed distribution of age at onset for ICP in our cohort. There were differences between early-onset and late-onset ICP with respect to basic clinical characteristics and development of key clinical events regardless of the cut off age at onset i.e. 15, 25, 35, 45 or even higher. The validity of the bimodal classification of early-onset and late-onset ICP could not be established in our large patient cohort and therefore such a classification needs to be reconsidered.

Risk factors and nomogram for diabetes mellitus in idiopathic chronic pancreatitis.

BACKGROUND AND AIM: Diabetes mellitus (DM) is a common complication of idiopathic chronic pancreatitis (ICP), which impairs the quality of life for patients. This study aimed to identify risk factors and develop nomogram for DM in ICP to help early diagnosis. METHODS: Idiopathic chronic pancreatitis patients admitted to our center from January 2000 to December 2013 were included. Cumulative rates of DM were calculated by Kaplan-Meier method. Patients were randomly assigned, in a 2:1 ratio, to the training and validation cohort. Based on training cohort, risk factors for DM were identified through Cox proportional hazards regression model, and nomogram was developed. Internal and external validations were performed based on the training and validation cohort, respectively. RESULTS: Totally, 1633 patients with ICP were finally enrolled. The median follow-up duration was 9.8 years. DM was found in 26.3% (430/1633) of patients after the onset of CP. Adult at onset of ICP, biliary stricture at/before diagnosis of CP, steatorrhea at/before diagnosis of CP, and complex pathologic changes in main pancreatic duct were identified risk factors for DM development. The nomogram achieved good concordance indexes in the training and validation cohorts, respectively, with well-fitted calibration curves. CONCLUSIONS: Risk factors were identified, and nomogram was developed to determine the risk of DM in ICP patients. Patients with one or more of the risk factors including adult at onset of ICP, biliary stricture at/before diagnosis of CP, steatorrhea at/before diagnosis of CP, and complex pathologic changes in main pancreatic duct have higher incidence of DM.

[Effect of electroacupuncture on renal fibrosis in spontaneously hypertension rats and its related mechanisms].

OBJECTIVE: To observe the effect of electroacupuncture (EA) on blood pressure, renal fibrosis and expression of tissue inhibitors of metalloproteinase-1 (TIMP-1), plasminogen activator inhibitor 1 (PAI-1), and alpha smooth muscle actin (α-SMA) in spontaneous hypertension rats (SHR), so as to explore its mechanisms underlying improving hypertensive renal damage. METHODS: Forty male SHR (15 weeks in age) were randomly divided into 5 groups: model, medication (Losartan), Shenshu, Geshu, and Shenshu＋Geshu groups(n=8 rats in each group), and the same age-old male 8 Wistar-Kyoto (WKY) rats were used as the normal control group. Rats of the medication group were treated by gavage of Losartan potassium solution (3 mg/mL, 30 mg·kg-1·d-1, once a day for 12 weeks), and those of the 3 EA groups treated by EA stimulation of bilateral "Shenshu" (BL23), "Geshu"(BL17) or both BL23 and BL17 (2 Hz/100 Hz, 1 mA, 15 min each time, once every other day for 12 weeks). The systolic blood pressure of the tail artery was measured before, and 4, 8 and 12 weeks after the intervention. The expression of TIMP-1, PAI-1 and α-SMA proteins of the right kidney tissue was measured by immunohistochemistry. Histopathological changes of the right renal tissue were observed under light microscope after H.E. stain. RESULTS: The blood pressure was significantly higher in the mo-del group than those in the normal control group (P<0.01), and considerably decreased at the 4th , 8th, and 12th week of the interventions in the medication and 3 EA groups (P<0.01). The expression levels of renal TIMP-1, PAI-1 and α-SMA proteins were notably higher in the model group than those in the normal control group and considerably decreased at the 12th week of the interventions in the medication and 3 EA groups than in the model group (P<0.01). H.E. staining of the renal tissue showed disordered arrangement of the renal cells, congestion and dilation of capillaries with thickened vascular wall, renal tubule atrophy and lumen stenosis with some necrosis of renal tubules, protein tubule and cell tubules, increase of some glomerular mesangial matrix and hyperplasia of fibrous tissue in the model group, which was re-latively milder in the medication and 3 EA groups. CONCLUSION: EA of BL23 and BL17 can reduce the blood pressure in SHR, which may be related to its function in down-regulating expression of TIMP-1, PAI-1 and α-SMA proteins.

SIRT1 knock-in mice preserve ovarian reserve resembling caloric restriction.

Previous studies have proposed that caloric restriction (CR) regulates many cell functions and prolongs the lifespan of an organism. Our previous studies proposed that CR also prevents follicular activation and preserves the ovarian reserve in mice by activating SIRT1. To test if SIRT1 preserves the ovarian reserve and prolongs the ovarian longevity, we generated SIRT1 knock-in mice that can overexpress SIRT1 in oocytes of the mouse. Ovaries of the mice at ages 35 days and 15 months were collected, and the follicular development and follicular reserve were examined. The vaginal opening and onset of estrus of transgenic female mice (both the homozygous and heterozygous for SIRT1 overexpression) were later than that of wild-type mice. Both the homozygous and heterozygous SIRT1-overexpressing mice had a larger and stronger reproductive capacity than wild-type mice. Moreover, 35-day-old and 15-month-old homozygous and heterozygous SIRT1-overexpressing mice also had a higher mean number and percentage of healthy follicles, fewer atretic follicles than wild-type mice, and the mean number and percentage of primordial follicles in both the homozygous and heterozygous SIRT1-overexpressing mice were higher than wild-type mice at the same age. However, the phenotypes of heterozygous and homozygous transgenic mice came no difference. Immunohistochemistry showed increased expression of SIRT1 and FOXO3a, and decreased expression of mTOR in both the homozygous and heterozygous SIRT1-overexpressing mice compared with wild-type mice. Thus, oocyte-specific SIRT1-overexpressing mice continuously activate FOXO3a and suppress mTOR and have a larger reproductive capacity, larger follicle reserve and longer ovarian lifespan.

Three-dimensional DNA nanostructures to improve the hyperbranched hybridization chain reaction.

Nonenzymatic nucleic acid amplification techniques (e.g. the hybridization chain reaction, HCR) have shown promising potential for amplified detection of biomarkers. However, the traditional HCR occurs through random diffusion of DNA hairpins, making the kinetics and efficiency quite low. By assembling DNA hairpins at the vertexes of tetrahedral DNA nanostructures (TDNs), the reaction kinetics of the HCR is greatly accelerated due to the synergetic contributions of multiple reaction orientations, increased collision probability and enhanced local concentrations. The proposed quadrivalent TDN (qTDN)-mediated hyperbranched HCR has a ∼70-fold faster reaction rate than the traditional HCR. The approximately 76% fluorescence resonance energy transfer (FRET) efficiency obtained is the highest in the reported DNA-based FRET sensing systems as far as we know. Moreover, qTDNs modified by hairpins can easily load drugs, freely traverse plasma membranes and be rapidly cross-linked via the target-triggered HCR in live cells. The reduced freedom of movement as a result of the large crosslinked structure might constrain the hyperbranched HCR in a confined environment, thus making it a promising candidate for in situ imaging and photodynamic therapy. Hence, we present a paradigm of perfect integration of DNA nanotechnology with nucleic acid amplification, thus paving a promising way to the improved performance of nucleic acid amplification techniques and their wider application.