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Results for “genomic stability”

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At least 19 recordsLinked to original sources
PubMed2026

Using the DNA language model, GROVER, to parse effects of sequence, chromatin and regulatory features on genome stability.

MOTIVATION: Genome stability is shaped by DNA sequence and chromatin context, but their relative contributions to double-strand break (DSB) sensitivity remain unclear. RESULTS: We show that the DNA language model, GROVER, can infer DSB location based on sequence. DSB hotspots tend to contain GC-rich sequences that belong to promoters, genes and short interspersed nuclear elements (SINEs). Additionally, we identified several specific short sequences (tokens) that are associated with modulating DSB sensitivity. Another model using chromatin and genome regulatory features outperforms the sequence-only model, highlighting complementary and cell-type specific information. Integrating sequence and genome biological features yields the best performance, demonstrating their synergy. Analyzing this model revealed that, dependent on the sample, genome stability information encoded in H3K36me3 and DNase-seq can be learned from the sequence, but not H3K27ac or H3K9me3. Embedding chromatin data directly into the GROVER architecture enabled cell-type specific modeling with performance matching the full chromatin feature model. Our results suggest that while chromatin and regulatory context provides important information, such as cell-type specificity, much of the information shaping DSB patterns is already encoded in the DNA sequence itself. Our integrative modeling approach not only reveals DSB patterns but also provides a generalizable strategy for tracing predictions in genomic data. AVAILABILITY: Data, models, and a tutorial are available on Zenodo.

Chromatin↗
PubMed2026

Cohesin promotes genomic stability by suppressing unequal sister chromatid exchange.

The protein complex cohesin plays critical roles in genomic stability by tethering together sister chromatids at their pericentric regions and along their arms from S phase until anaphase. Cohesin-mediated pericentric cohesion prevents aneuploidy by ensuring bipolar attachment of sister kinetochores. Arm cohesion prevents loss of heterozygosity by biasing DNA repair via recombination between sister chromatids rather than between homologs. Here, we investigate in yeast whether cohesin also enhances genomic stability by suppressing unequal sister chromatid exchange (USCE) between repetitive sequences. In wild-type cells, the USCE rate between repeats 4kb apart (proximal) was 15X higher than repeats 68kb apart (distal). The USCE between distal repeats but not proximal repeats increased 4 to 7-fold in mutants with altered cohesin subunits or auxiliary factors. The level of increased distal USCE corresponded with reduced arm cohesion, reduced density of cohesion arm sites, and higher sister loci mobility. Our results suggest that high density of arm cohesion sites confines repair of DNA damage to local sequences. When the density of cohesion sites decreases, sister chromatid sequences are less confined, thereby enhancing distal repeat interactions and USCE. Another set of mutations disrupted both DNA replication and cohesin loading at the replication fork during S phase. Remarkably, distal USCE in these mutants increased approximately 100-fold and was 6-fold more likely than proximal USCE. This preferential hyperdistal USCE can be explained by an aberrant sister-chromatid structure that is normally prevented by proper coupling of cohesin function and replication.

Journal Article↗
PubMed2026

R-loops and D-loops: a delicate balance in genomic stability and instability.

R-loops and D-loops are three-stranded nucleic acid structures that have emerged as central regulators of genome stability, gene expression, and DNA metabolism. R-loops form co-transcriptionally or post-transcriptionally when nascent RNA re-anneals with the template DNA strand, generating an RNA: DNA hybrid that displaces the non-template strand into a single-stranded state. These structures are enriched at CpG island promoters, transcription termination sites, and immunoglobulin class-switch regions, where they coordinate transcription regulation, chromatin remodeling, and DNA damage signaling. D-loops are formed when a single-stranded DNA segment pairs with one strand of a duplex and displaces the other, arising through context-dependent mechanisms that include RAD51- or DMC1-mediated strand invasion in homologous recombination, shelterin-assisted invasion at telomeres, and replication-coupled strand displacement at the mitochondrial DNA origin. They serve as indispensable intermediates in double-strand break repair, telomere maintenance, and mitochondrial DNA replication. Recent cryo-electron microscopy studies have resolved the stepwise RAD51-mediated strand exchange mechanism at near-atomic resolution, substantially advancing structural understanding of D-loop biogenesis. Despite their differences in molecular composition, both structures remodel Watson-Crick base pairing and, when dysregulated, are associated with replication fork stalling, transcription-replication conflicts, and aberrant recombination. This review systematically compares the structural features, formation mechanisms, regulatory networks, and biological functions of R-loops and D-loops, with emphasis on their convergent roles in safeguarding genome integrity. We further discuss rapidly evolving detection technologies and emerging therapeutic strategies targeting these structures in cancer and neurodegeneration, identifying key unresolved questions for future investigation.

Genomic Instability↗
PubMed2025

Donor transcription suppresses D-loops in cis and promotes genome stability.

DNA is a substrate for competing protein-mediated activities. Whether and how transcription and the synaptic steps of recombination collide or are coordinated has not been investigated. Here, using a controlled break induction system and physical detection of D-loop DNA joint molecules in S. cerevisiae, we show that donor transcription by RNA polymerase II strongly and acutely suppresses D-loops in cis. The extent of this suppression depends on the orientation of transcription, suggesting the preferential usage of one end for the repair of DNA break in transcribed regions. Transcription-mediated D-loop suppression does not rely on endogenous transcription factors, the RNA product, or RNA:DNA hybrids. It is independent of, and can be more potent than the conserved trans D-loop-disruption factors Sgs1-Top3-Rmi1BLM-TOPO3α-RMI1/2, Mph1FANCM, and Srs2. This transcription-mediated control promotes genome maintenance by inhibiting ectopic recombination and multi-invasion-induced rearrangements, while authorizing allelic inter-homolog repair. These findings reveal the prioritization between two universal DNA-dependent processes and its role in promoting genome stability.

Genomic Instability↗
PubMed1978

Genomic stability of gibbon oncornavirus.

The 70S RNAs from several gibbon type C viruses were examined for sequence homology by molecular hybridization using complementary DNA probes. The sequence homology was found to vary with each virus isolate. The genome from one isolate was examined for genomic stability after the virus was experimentally passaged through three unrelated gibbons. The genomic homology remained unchanged after three passages, having greater than 93% homology based on complementary DNA-70S RNA hybridization and melting temperature analysis of the duplex. The genome from another isolate was similarly found to be unchanged after the virus was naturally transmitted in gibbons. The genomic variation found in the various isolates is not the consequence of recent horizontal transmission from a common virus.

Animals↗
PubMed2025

The mutation landscape of Daphnia obtusa reveals evolutionary forces shaping genome stability.

Spontaneous mutations are the primary source of genetic variation and play a central role in shaping evolutionary processes. To investigate mutational dynamics in Daphnia obtusa, we generated a chromosome-level genome assembly spanning 129.4 Mb across 12 chromosomes, encompassing 15,321 predicted protein-coding genes. Leveraging whole-genome sequencing of eight mutation accumulation (MA) lines propagated for an average of 482 generations (spanning over 20 years), we estimated a spontaneous single nucleotide mutation (SNM) rate of 2.23 × 10-9 and an indel mutation rate of 2.75 × 10-10 per site per generation. The SNM spectrum was strongly biased toward C:G > T:A transitions. Comparative analyses with natural population data revealed that exonic mutations observed in the MA lines were significantly less likely to be present in standing variation than intronic or intergenic mutations, suggesting that purifying selection in natural populations acts to remove deleterious alleles. We also identified 48 de novo loss-of-heterozygosity (LOH) events, comprising 8 heterozygous deletions and 40 gene conversion events. The genome-wide gene conversion rate was estimated at 2.62 × 10-5 per heterozygous site per generation. These findings provide a comprehensive view of the mutation spectrum, selective pressures, and mechanisms underlying genome stability in D. obtusa.

Daphnia obtusa↗
PubMed2025

DDX37 and DDX50 Maintain Genome Stability by Preventing Transcription-dependent R-loop Formation.

R-loops consist of an RNA-DNA hybrid and a displaced single-stranded DNA strand that play a central role in several biological processes. However, as the presence of aberrant R-loops forms a significant threat to genome stability, R-loop formation and resolution is strictly controlled by RNAse H and helicases. In a screening for RNA helicases, previously described as RNA-DNA hybrid interactors, that control genome integrity, we identified for the first time DDX37 and DDX50. Depletion of DDX37 and DDX50 promotes DNA damage, as demonstrated by H2AX phosphorylation and increased comet tail length. In addition, knock down of these RNA helicases decreases the DNA replication track length and leads to RPA focus formation, results that are indicative of replication stress. Downregulation of DDX37 and DDX50 triggers an increase in RNA-DNA hybrids, that can be reverted by the overexpression of RNase H1. Interestingly, inhibition of transcription prevented the increased RNA-DNA hybrid formation and DNA damage upon DDX37 or DDX50 depletion. Together these results demonstrate that DDX37 and DDX50 are important for resolving RNA-DNA hybrids appearing during transcription and thereby preventing DNA damage by replication stress.

DEAD-box RNA Helicases↗
PubMed2026

Dynamic chromatin tethering of MDC1 regulates genome stability.

DNA double-strand breaks (DSBs) are highly cytotoxic DNA lesions because they disrupt the connectivity of the DNA strand. Homologous recombination (HR) is a high-fidelity DSB repair pathway that copies the sequence spanning the break from a homologous template, but how DNA ends are held together during HR remains unclear. Here we demonstrate that the proline-serine-threonine (PST) repeat region of Mediator of DNA Damage Checkpoint 1 (MDC1) is a multivalent nucleosome-binding domain, sufficient to tether chromatin in multiple contexts. In interphase, the constitutive chromatin association of MDC1 is critical for RAD51 loading and efficient HR. In mitosis, PST-mediated chromatin binding is attenuated by phosphorylation, preventing aberrant chromosomal interactions while preserving DNA tethering by the MDC1-TOPBP1-CIP2A complex. In total, this work demonstrates that the PST repeat region of MDC1 is a multivalent nucleosome-binding domain with tunable affinity that supports DSB repair by HR and maintains genome stability during mitosis.

Genomic Instability↗
PubMed2026

Maternal DNA repair safeguards genome stability during the oocyte-to-embryo transition.

De novo mutations are a major source of genetic variation and disease risk, yet the developmental timing and mechanisms underlying their origin require further investigation. While germ cells have traditionally been considered the primary source of these mutations, increasing evidence suggests that a substantial fraction arise after fertilization. Here, we investigated the role of maternal DNA repair in shaping mutagenesis during this critical window by using a mouse model with oocyte-specific disruption of the homologous recombination factor RAD51 and a combination of cellular and molecular analyses. Loss of maternal RAD51 led to the accumulation of DNA double-strand breaks in oocytes without impairing their growth, meiotic maturation, or fertilization competence. In contrast, embryos derived from RAD51-deficient oocytes exhibited increased DNA damage and developmental delay during early cleavage stages. Whole-genome sequencing revealed a significant increase in de novo variants in offspring, the majority displaying intermediate allele frequencies consistent with post-zygotic mosaic mutations. These findings confirm that maternal DNA repair safeguards genome stability across the oocyte-to-embryo transition and identify early embryogenesis as a major source of de novo mutations, with implications for reproductive biology and the origins of genetic diseases.

DNA↗
PubMed2025

CDK12 inhibition reveals melanoma dependence on the RUNX1/CBFβ complex for genomic stability.

Cutaneous melanoma is the deadliest form of skin cancer, frequently driven by hyperactivation of the RAS/mitogen-activated protein kinase (MAPK) pathway. Cyclin-dependent kinase 12 (CDK12), a downstream effector of MAPK signaling, has emerged as a therapeutic target due to its essential role in transcriptional regulation and DNA damage repair. To identify vulnerabilities associated with CDK12 inhibition, we performed a genome-wide CRISPR-Cas9 screen and identified the Runt-related transcription factor RUNX1 and its cofactor CBFβ as synthetic lethal partners of CDK12. RUNX1 inhibition enhanced melanoma sensitivity to CDK12 inhibitors in a p53-independent manner, resulting in DNA damage accumulation and impaired repair capacity. Combined inhibition of CDK12 and RUNX1 suppressed melanoma growth in vivo. These findings identify RUNX1/CBFβ as a compensatory mechanism in CDK12-inhibited melanoma and define a synthetic lethal interaction with translational potential for combinatorial therapy.

Core Binding Factor Alpha 2 Subunit↗
PubMed2024

FANCJ DNA helicase is recruited to the replisome by AND-1 to ensure genome stability.

FANCJ, a DNA helicase linked to Fanconi anemia and frequently mutated in cancers, counteracts replication stress by dismantling unconventional DNA secondary structures (such as G-quadruplexes) that occur at the DNA replication fork in certain sequence contexts. However, how FANCJ is recruited to the replisome is unknown. Here, we report that FANCJ directly binds to AND-1 (the vertebrate ortholog of budding yeast Ctf4), a homo-trimeric protein adaptor that connects the CDC45/MCM2-7/GINS replicative DNA helicase with DNA polymerase α and several other factors at DNA replication forks. The interaction between FANCJ and AND-1 requires the integrity of an evolutionarily conserved Ctf4-interacting protein (CIP) box located between the FANCJ helicase motifs IV and V. Disruption of the CIP box significantly reduces FANCJ association with the replisome, causing enhanced DNA damage, decreased replication fork recovery and fork asymmetry in cells unchallenged or treated with Pyridostatin, a G-quadruplex-binder, or Mitomycin C, a DNA inter-strand cross-linking agent. Cancer-relevant FANCJ CIP box variants display reduced AND-1-binding and enhanced DNA damage, a finding that suggests their potential role in cancer predisposition.

Humans↗
PubMed2015

NUCKS1 is a novel RAD51AP1 paralog important for homologous recombination and genome stability.

NUCKS1 (nuclear casein kinase and cyclin-dependent kinase substrate 1) is a 27 kD chromosomal, vertebrate-specific protein, for which limited functional data exist. Here, we demonstrate that NUCKS1 shares extensive sequence homology with RAD51AP1 (RAD51 associated protein 1), suggesting that these two proteins are paralogs. Similar to the phenotypic effects of RAD51AP1 knockdown, we find that depletion of NUCKS1 in human cells impairs DNA repair by homologous recombination (HR) and chromosome stability. Depletion of NUCKS1 also results in greatly increased cellular sensitivity to mitomycin C (MMC), and in increased levels of spontaneous and MMC-induced chromatid breaks. NUCKS1 is critical to maintaining wild type HR capacity, and, as observed for a number of proteins involved in the HR pathway, functional loss of NUCKS1 leads to a slow down in DNA replication fork progression with a concomitant increase in the utilization of new replication origins. Interestingly, recombinant NUCKS1 shares the same DNA binding preference as RAD51AP1, but binds to DNA with reduced affinity when compared to RAD51AP1. Our results show that NUCKS1 is a chromatin-associated protein with a role in the DNA damage response and in HR, a DNA repair pathway critical for tumor suppression.

Cell Line↗
PubMed2025

RNA/DNA Binding Protein TDP43 Regulates DNA Mismatch Repair Genes with Implications for Genome Stability.

TDP43 is an RNA/DNA binding protein increasingly recognized for its role in neurodegenerative conditions, including amyotrophic lateral sclerosis and frontotemporal dementia (FTD). As characterized by its aberrant nuclear export and cytoplasmic aggregation, TDP43 proteinopathy is a hallmark feature in over 95% of ALS/FTD cases, leading to the formation of detrimental cytosolic aggregates and a reduction in nuclear functionality within neurons. Building on our prior work linking TDP43 proteinopathy to the accumulation of DNA double-strand breaks (DSBs) in neurons, the present investigation uncovers a novel regulatory relationship between TDP43 and DNA mismatch repair (MMR) gene expressions. Here, we show that TDP43 depletion or overexpression directly affects the expression of key MMR genes. Alterations include MLH1, MSH2, MSH3, MSH6, and PMS2 levels across various primary cell lines, independent of their proliferative status. Our results specifically establish that TDP43 selectively influences the expression of MLH1 and MSH6 by influencing their alternative transcript splicing patterns and stability. We furthermore find aberrant MMR gene expression is linked to TDP43 proteinopathy in two distinct ALS mouse models and post-mortem brain and spinal cord tissues of ALS patients. Notably, MMR depletion resulted in the partial rescue of TDP43 proteinopathy-induced DNA damage and signaling. Moreover, bioinformatics analysis of the TCGA cancer database reveals significant associations between TDP43 expression, MMR gene expression, and mutational burden across multiple cancers. Collectively, our findings implicate TDP43 as a critical regulator of the MMR pathway and unveil its broad impact on the etiology of both neurodegenerative and neoplastic pathologies.

Amyotrophic lateral sclerosis↗
PubMed2025

Refined and benchmarked homemade media for cost-effective, weekend-free human pluripotent stem cell culture.

BACKGROUND: Cost-effective, practical, and reproducible culture of human pluripotent stem cells (hPSCs) is required for basic and translational research. Basal 8 (B8) has emerged as a cost-effective solution for weekend-free and chemically-defined hPSC culture. However, the requirement to home-produce some recombinant growth factors for B8 can hinder access and reproducibility. Moreover, we found the published B8 formulation suboptimal in widely-used normoxic hPSC culture. Lastly, the performance of B8 in functional applications such as genome editing or organoid differentiation required systematic evaluation. METHODS: We formulated B8 with commercially available, growth factors and adjusted its composition to support normoxic culture of WTC11 human induced pluripotent stem cell line. We compared this formulation (B8+) with commercial Essential 8 (cE8) and a home-made, weekend-free E8 formulation (hE8). We measured pluripotency marker expression and cell cycle by flow cytometry, and investigated the transcriptional profiles by bulk and single-cell RNA sequencing. We further assessed genomic stability, genome editing efficiency, single-cell cloning, and differentiation in both monolayer and organoids. Finally, we validated key findings using male (H1) and female (H9) human embryonic stem cells. RESULTS: hE8 performed comparably to cE8 across most functional assays and cell lines. In contrast, cells in B8+ displayed higher NANOG expression and improved genome editing efficiency. At the same time, B8+ led to gene expression changes indicative of marked lineage priming, reflected in altered morphology and differential response to some differentiation protocols. Both weekend-free media resulted in a modest transcriptional shift towards a less metabolically active state, consistent with intermittent media starvation. CONCLUSIONS: Homemade weekend-free media can provide a cost-effective alternative to commercial formulations. hE8, integrating some features of B8 while resembling cE8, emerges as a robust and practical option with limited compromises. B8+, though advantageous in some contexts, warrants caution due to lineage priming effects that may impact differentiation outcomes.

hiPSC; pluripotency; culture media; thermostable F↗
PubMed2026

Repeated drought induces a reproducible DNA methylation response associated with gene expression in Quercus lobata.

UNLABELLED: Long-lived trees must continually adjust to environmental change and face sustained climatic shifts over their lifetimes. One increasingly important challenge is the rising frequency of drought caused by climate change. Environmentally responsive DNA methylation is widespread in plants, but whether it contributes to gene expression during environmental stress remains unclear, particularly in long-lived trees. Here, we integrated long read methylomes and transcriptomes from valley oak ( Quercus lobata ) seedlings exposed to repeated drought and well-watered treatments. Repeated drought induced a reproducible DNA methylation response that repeatedly targeted the same genomic regions despite turnover of individual methylated sites. These repeatedly targeted regions were transposable elements (TEs) located near genes. Genes adjacent to CHH-methylated TEs were enriched for core drought-response pathways, including abscisic acid signaling, osmotic adjustment and cell-wall remodeling, and remained transcriptionally activated under drought. However, higher CHH methylation levels were associated with progressively smaller transcriptional responses, suggesting that environmentally responsive DNA methylation influences how strongly drought- response genes are activated rather than simply switching them on or off. At the same time, greater CHH methylation was associated with continued repression of nearby TEs, suggesting that this response may simultaneously regulate gene activity while maintaining genome stability. Together, these findings identify a reproducible genome- regulatory response associated with repeated environmental stress in a long-lived tree. By repeatedly targeting the same genomic regions despite turnover of individual sites, this response provides a framework for how long-lived trees repeatedly adjust gene expression while maintaining genome stability during environmental change. SIGNIFICANCE STATEMENT: Plants cannot escape environmental change, and trees must repeatedly respond to stresses, such as drought, over lifetimes spanning decades to centuries. Yet little is known about the molecular mechanisms that make this remarkable resilience possible. Using a widespread California oak, we show that repeated drought repeatedly induced the same DNA methylation pattern in the same parts of the genome, even though the differentially methylated individual sites changed between drought events. This pattern was linked to how strongly drought-response genes were activated, suggesting that trees repeatedly deploy the same molecular program to respond to environmental stress. Our findings provide a new framework for understanding how long-lived organisms repeatedly adjust to changing climates.

Journal Article↗
PubMed2025

Arabidopsis thaliana FANCONI ANAEMIA I (FANCI) has roles in the repair of interstrand crosslinks and CRISPR-Cas9 induced DNA double strand breaks.

DNA repair is crucial for genome stability, in particular for plants which are exposed to high levels of damage arising from UV irradiation, soil pollutants and reactive oxygen species. Damage that affects both strands of the DNA duplex is harder to repair due to both the lack of a template strand and the potential for physical separation of fragmented chromosomes. As such, DNA double-strand breaks (DSBs) and interstrand DNA crosslinks (ICL) are particularly cytotoxic forms of damage. Here we report the functions of FANCONI ANAEMIA I (FANCI), an Arabidopsis thaliana homologue of the mammalian ICL repair protein. We show that in plant cells, as in mammals, FANCI forms a nuclear localised complex with FANCD2. Genetic analysis of plants lacking FANCI displays significant hypersensitivity to the DNA crosslinking reagent mitomycin C. Furthermore, mutation of FANCI in combination with mutations in a second ICL repair factor, METHYL METHANESULFONATE AND UV-SENSITIVE PROTEIN 81 (MUS81), results in increased levels of programmed cell death compared to the corresponding single mutants, revealing roles in maintaining plant genome stability. Sequence analysis of mutational repair of CRISPR-Cas9-induced DSBs revealed that FANCI promotes single nucleotide insertions and reduces longer deletions. This pattern of mutations may reflect roles for FA proteins in replication-coupled repair of a subset of DSBs. Taken together, this analysis finds evidence for multiple roles for FANCI in the maintenance of plant genome stability.

Arabidopsis↗
PubMed2025

BET family BRD3 initiates DSB-induced chromatin remodeling with TIP60 to promote R-loop-mediated HR.

Mechanisms for genome stability in actively transcribed regions are essential for cellular homeostasis; however, these mechanisms are poorly understood. Herein, we identify the bromodomain and extraterminal domain (BET) family BRD3 as the genome caretaker in actively transcribed chromatin. We identify the protein network between BRD3 and chromatin remodeler TIP60. During transcription, BRD3 localizes to actively transcribed chromatin through its N-terminal bromodomains. Following DNA double-strand breaks (DSBs) at the actively transcribed chromatin, the C-terminal extraterminal (ET) domain of BRD3 recruits CHD4 via its KIKL-like motifs to replace HP1 with the TIP60 (Tat-interactive protein, 60 kDa) complex, promoting H4K16 acetylation and MBTD1 recruitment, which creates chromatin barriers to 53BP1. This process recruits BRCA1 and R-loop-processing factors to promote R-loop-mediated homologous recombination (HR) and suppress 53BP1 and mutagenic non-homologous end-joining. Our study elucidates the mechanism by which BRD3 initiates DSB-induced chromatin remodeling by CHD4 and TIP60 to promote R-loop-mediated HR on actively transcribed chromatin to maintain genome stability.

Humans↗
PubMed2026

Multivalent cations stabilize DNA duplexes beyond charge neutralization.

Multivalent cations are abundant in cells and play essential roles in DNA duplex stability, genome packaging, and DNA-protein interactions. They can also condense DNA, making it challenging to determine their influence on DNA duplex stability. To overcome this challenge, we studied DNA unpeeling at equilibrium under high tension using magnetic tweezers, thereby preventing condensation. Experiments show that DNA duplex stability first increases and then decreases as cation concentration increases and the maximum DNA duplex stability increases with cation valence. The maximum free energy change of DNA was 3.33 k B T/bp for Na+ and increased to 3.98 k B T/bp for protamine, which is a small arginine-rich protein with a highly positive charge (≈21 for salmon sperm), corresponding to a relative increase of 19.5%. Consistently, all-atom molecular dynamics simulations show that higher-valent cations preferentially embed in the minor groove of DNA and clamp the minor groove, in contrast to the major-groove clamping reported for RNA, thereby stabilizing the helix more efficiently. These findings establish a single-molecule framework for quantifying DNA thermodynamics in complex ionic environments, which contributes to understanding ionic control of genome stability and to designing ion-tunable DNA-based nanostructures and delivery systems.

Journal Article↗