Scalability gaps in Biology

Representative open questions

Showing 30 of 78 — one per source paper, highest-quality first.

• Fast analysis and engineering of protein function by microbe-independent deep assembly and screening (2026) · doi

  The MIDAS methodology demonstrates primer design and PCR assembly for single genes, but the scalability to simultaneously engineer multiple genes in a metabolic pathway or multi-protein complex has not been explored. Testing MIDAS-PM and MIDAS-PP on coordinately mutagenized multi-gene constructs would establish whether the current polytemplated and polyfocal approaches can handle the increased complexity of pathway-level protein engineering.

• Inferring High-Dimensional Dynamic Networks Changing with Multiple Covariates (2026) · doi

  The CVN methodology was applied only to the KiKme gene expression dataset with p=191 nodes and two external covariates (cancer group and radiation dose). The generalizability of the covariate-varying network inference approach to datasets with higher-dimensional gene expression spaces (p>1000) and more than two categorical or continuous covariates remains unexplored.

• Evaluating poultry by-product meal, tomato pomace, and azolla with or without Natuzyme supplementation as sustainable alternatives to fish meal for Nile tilapia (Oreochromis niloticus) (2026) · doi

  The study does not address the economic cost-benefit analysis of incorporating Natuzyme enzyme supplementation with these sustainable feed alternatives at commercial aquaculture scales, nor does it evaluate the practical implementation feasibility in small-scale and intensive tilapia farming systems across different geographic regions.

• The potential of metabolic engineering for sustainable phytosterol production (2026) · doi

  TCNeKP demonstrates superior performance on wild-type and mutant enzymes for phytosterol pathway components, but its ability to model extremely long protein sequences is limited, potentially restricting its application to very large phytosterol biosynthetic enzymes. Extending TCN architecture to handle extended sequences remains an unresolved technical challenge.

• Simulation-based inference captures non-Markovian effects as exemplified in protein production kinetics through cell division (2026) · doi

  The paper does not specify computational scaling behavior when applying SBI methods (flow matching, normalizing flows, neural likelihood networks) to chemical master equation systems with state spaces larger than those typical in single-cell protein production. Scalability to systems requiring finite state projection approximations with matrices exceeding 10^4-10^5 dimensions remains unaddressed.

• Non-coding RNA delivery via lipid nanoparticles: a novel strategy for cancer immunotherapy (2026) · doi

  circRNA production faces high-cost barriers and lacks standardized functional validation systems for large-scale manufacturing; specific protocols for circularization efficiency, copy number optimization, and batch-to-batch consistency assessment in GMP-compliant LNP-circRNA formulations have not been established.

• Sex chromosome evolution mediated by a large inversion and a possible switch of the sex determination gene (2026) · doi

  The comparative analysis of female-specific polymorphisms was extended to only 3 additional Salix species (S. purpurea, S. suchowensis, S. viminalis) by mapping reads to the S. herbacea reference; testing whether identified female-specific sites and SNPs are conserved across the full Salix genus diversity and in distantly related dioecious plant genera would clarify the generalizability of the sex determination mechanism.

• Harnessing climate-adaptive breeding to accelerate tolerance to extreme temperatures in rice (2026) · doi

  Thermo-sensitive genic male sterile lines in neo-tetraploid rice have demonstrated hybrid vigor through gene editing, but scaling these breeding approaches to practical deployment at the farm level with climate variability projections remains underdeveloped. Integration of climate-adaptive breeding strategies with speed breeding protocols and phenotypic selection across transient heat stress periods during early grain development needs validation.

• Innovative CRISPR-Cas9 Strategies for Epigenetic Modulation of HIV-1 Latency: Targeting Tissue-Specific Reservoirs with Multiplexed Approach (2026) · doi

  Scalability of the multiplexed epigenetic modulation approach to resource-limited settings in Africa and other endemic regions is mentioned but not addressed; the paper does not specify manufacturing protocols, cold-chain requirements, cost thresholds, or regulatory pathways needed to translate ligand-targeted nanoparticle and CAR-T delivery systems to low-income healthcare systems.

• Postbiotics and phage synergy in precision oral microbiome engineering: systems biology strategies targeting Streptococcus mutans in dental caries (2026) · doi

  Standardized protocols for efficacy testing, safety assessment, and regulatory framework definition for engineered postbiotics combined with bacteriophage-based interventions in oral microbiome engineering do not currently exist, preventing clinical translation of precision microbiome strategies.

• Cell Biology: Up Against the Wall (2013) · doi

  The RC41 strain employs HynSL hydrogenase from Alteromonas macleodii with endogenous HoxYH deletion, but the long-term metabolic stability and circadian phase coherence of this heterologous hydrogenase cluster under continuous KaiA-OX expression in industrial-scale photobioreactor conditions has not been demonstrated.

• Editorial overview: Synthetic biology: Frontiers in synthetic biology (2017) · doi

  Bio-Design Automation tools are proposed to leverage combinatorial engineering enabled by modular DNA assembly and next-generation sequencing for large-scale experiments, but the paper does not specify the experimental design parameters, library complexity scales, or sequencing depth required to systematically explore combinatorial design space.

• Applied Developmental Biology (2016) · doi

  The paper discusses cell aggregation optimization for pancreatic progenitor differentiation (Toyoda et al., 2015) but does not establish the precise aggregate size ranges, cell density parameters, or temporal dynamics of aggregation needed to scale from laboratory-optimized conditions to clinically relevant cell volumes for transplantation.

• Production biology (2016) · doi

  The proposed shift from traditional production paradigm to tinkering production in synthetic biology lacks quantitative comparison data showing how adoption of the tinkering methodology affects research timelines, resource efficiency, success rates of engineered biological systems, and whether this approach scales effectively to industrial-scale production biology applications.

• AI-Driven Innovations in Plant Biotechnology for Sustainable Agriculture (2026) · doi

  The convergence of CRISPR with AI for intelligent gene editing is theoretically proposed but lacks empirical data on scalability of automated CRISPR plant tissue culture systems beyond laboratory scale to commercial-grade regeneration of edited crops with validated transformation efficiency rates.

• Metagenomic and Culture-Based Insights into Salinity-Driven Bacterial Community Dynamics throughout Crude Oil-Degrading Enrichment Cultivation (2026) · doi

  The metagenomic and culture-based approaches are applied to enrichment cultivation systems, but the paper does not validate whether the identified bacterial consortia maintain their degradation efficiency and community structure stability when scaled to field-level bioremediation conditions in saline-alkaline oil-contaminated soils. Controlled pilot-scale experiments comparing laboratory enrichments to field-amended soil microcosms with natural salinity variation are needed.

• Role of nanoparticles in plant tissue culture (2026) · doi

  Green sulphur nanoparticles have shown promise in Cannabis sativa micropropagation with genetic fidelity analysis (reference [134]), but scalability from laboratory-scale tissue culture to commercial-scale micropropagation using nanoparticle-supplemented systems has not been explored, limiting practical agricultural applications.

• Synthetic biology – pathways to commercialisation (2019) · doi

  The Colorifix textile dyeing application reports specific performance metrics (90% water reduction, 20% energy reduction, 99% dye reduction), but the paper does not address validation of these metrics across different textile material types, dye complexities, or industrial-scale manufacturing conditions beyond the engineered microorganism proof-of-concept.

• Neuroprotective potential of phycocyanobilin and C-phycocyanin: from molecular targets to translational applications (2026) · doi

  Advanced PCB formulations including nanoparticles, cyclodextrins, and liposomes have been proposed but their in vivo bioavailability, tissue targeting, and BBB penetration enhancement compared to free PCB remain uncharacterized. Comparative formulation studies are needed to determine optimal delivery platforms for neuroprotective applications.

• Fostering synergy between cell biology and systems biology (2015) · doi

  The 'gene-complete' whole cell model of Mycoplasma genitalium exists, but achieving comparable completeness in complex eukaryotic systems remains out of reach. The specific technical and computational barriers preventing extension of whole cell modeling to mammalian or human cell types, and the prioritization criteria for selecting which cellular functions to model comprehensively, need explicit identification.

• Metabolic Engineering and Synthetic Biology (2018) · doi

  While the HemAL operon co-expression successfully increased endogenous heme cofactor supply in E. coli, the paper does not address optimization of the C5 biosynthesis pathway modulation across different bacterial chassis or fermentation conditions. Scale-up from laboratory shake flask to bioreactor-level production with cost analysis for crude DyP-based bioremediation remains unexplored.

• Enhancement of RecET-mediated in vivo linear DNA assembly by a xonA mutation (2026) · doi

  The authors predict that RecET ΔxonA assembly will be possible with more than six DNA fragments into a single plasmid but have not experimentally tested this upper limit. The maximum number of fragments that can be simultaneously assembled with high efficiency and accuracy needs to be determined empirically.

• Discovery of unprecedented prenylated indole piperazines and pyrazines through cryptic biosynthetic gene cluster heterologous expression (2026) · doi

  The heterologous expression system yielded low isolated amounts of prenylated indole piperazines and pyrazines (compounds 8-9: 1-0.9 mg; compounds 15-17: 2-3 mg from 4L cultures), indicating optimization of the biosynthetic gene cluster expression level and culture media composition for these cryptic gene clusters is necessary to enable scale-up production.

• Process optimization and predictive modeling of multi-enzyme extraction of bioactive compounds from Rosa canina L. (2026) · doi

  The application of Box-Behnken Design (BBD) optimization to the multi-enzyme extraction system has not been validated across different Rosa canina L. cultivars and genotypes; the genetic variability observed in Liaudanskas et al. (antioxidant capacity ranging 188–397 µmol Trolox/g) suggests that cultivar-specific optimization parameters may be required for reproducible bioactive compound extraction.

• Bacterial cell fate under stress: lipid remodeling and antimicrobial peptide attack (2026) · doi

  The outer membrane permeability assay uses NPN fluorescence exclusively in E. coli; no investigation is presented on whether this NPN-based approach is applicable to Gram-positive bacteria or other Gram-negative species, limiting generalizability of the lipid remodeling and antimicrobial peptide interaction findings beyond the single model organism tested.

• Tissue-specific regulation of cellular senescence on elastic hydrogels via the integrin α1-mediated mechanotransduction (2026) · doi

  The mechanotransduction pathway has been characterized on two-dimensional elastic hydrogels, but the applicability to three-dimensional extracellular matrix environments with complex pore architecture, ligand presentation, and biochemical gradients has not been tested; 3D hydrogel models incorporating collagen or other ECM components would be necessary to validate tissue relevance.

• Saccharomyces cerevisiae Promoter Engineering before and during the Synthetic Biology Era (2021) · doi

  The scalability of dSpCas9-based Boolean logic circuits beyond simple NOR gates to larger combinatorial networks in S. cerevisiae has not been experimentally validated. While Gander et al. demonstrated a universal NOR gate with dSpCas9-Mxi1 that could theoretically combine into complex circuits, the actual experimental construction and functional characterization of multi-gate circuits with multiple sgRNA inputs requires investigation.

• Benchmarking long-read RNA-seq across modalities, methods, and sequencing depth in iNeurons (2026) · doi

  The benchmark evaluation of long-read RNA-seq quantification methods (Isoquant, Bambu, Oarfish, Kallisto, Isosceles, Miniquant) was standardized to 15M reads for GENCODE data based on the shallowest sample across three platforms; performance comparison at deeper sequencing depths (>15M reads) for ONT and PacBio remains uninvestigated.

• Photochemical tuning of materials: A click chemistry perspective (2018) · doi

  The photochemical fixation of DNA nanoconstructs using UV irradiation (λ = 365 nm) has only been demonstrated with 80-mer cyclic DNA and 10 base pair duplexes; the scalability and efficacy of this metal-free strain-promoted click chemistry approach on larger DNA oligomeric structures (>200 nucleotides) and varying sequence complexities remain unexplored.

• Society for Developmental Biology 71st Annual Meeting (2012) · doi

  The investigation of hnRNP K in Xenopus optic axon regeneration (B98) requires comparative analysis across different axonal injury models and timepoints to determine whether hnRNP K's regenerative capacity is specific to retinal ganglion neurons or generalizable to other neuronal populations.