Methodology gaps in Biology

Representative open questions

Showing 30 of 630 — one per source paper, highest-quality first.

• Disrupting the KRAS–SOS1 protein–protein interaction: mechanistic rationale for pan-KRAS pathway suppression and combination therapy (2026) · doi

  A notable design feature of NCT05578092 is the requirement for baseline and on-treatment tumor biopsies for pharmacodynamic evaluation when medically feasible, supporting a rigorous linkage between drug exposure and pathway modulation in humans (Dillon et al., 2021; Sudhakar et al., 2024).

• Longitudinal localization of leukaemic stem cells between the metaphysis and central marrow governs their behaviour (2026) · doi

  Reference 46 reports absence of CXCL12 gradients in bone marrow using 3D tissue-wide digital imaging, yet references 50 and 51 demonstrate therapeutic efficacy of CXCR4 inhibition in AML models. The apparent paradox between lack of detectable CXCL12 gradients and CXCR4-dependent leukaemic stem cell localization to specific marrow regions requires resolution through enhanced spatial resolution imaging or alternative chemokine detection methodologies.

• PICDGI: A framework for predicting cancer driver genes through dynamic gene-gene interaction modeling of single-cell data (2026) · doi

  PICDGI lacks integration of cell-cell communication networks into its dynamic gene-gene interaction modeling framework. The framework must be extended to incorporate intercellular signaling pathways and communication networks to better reflect multicellular dynamics underlying cancer evolution in scRNA-seq cohorts.

• Highly efficient chromatin conformation capture with post-enrichment in single cells by HiChew (2026) · doi

  PCR amplification is performed for 12-15 cycles with KAPA HiFi reagents, but the effect of cycle number variation on amplification bias, chimeric junction artifacts, and the recovery of weakly interacting loci in post-enrichment HiChew libraries has not been systematically evaluated.

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

  The MIDAS-MM and MIDAS-MP variants require 5' DNA sequence tags on outer primers (Fo, Ro) to prevent unwanted amplification from plasmid templates, but the paper does not systematically characterize how tag length, GC content, or position affects secondary PCR specificity or assembly efficiency. Optimization of tag design rules would improve the accessibility and robustness of monotemplated MIDAS protocols.

• Selective elimination of circulating effector CD8 T cells via LTβR blockade separates anti-CD137 efficacy from toxicity (2026) · doi

  The bone marrow chimera experiments used only LTβR−/− or LTβRf/f donor cells to examine the contribution of LTβR signaling on hematopoietic versus stromal cells in anti-CD137-induced hepatotoxicity. However, the paper does not specify whether LTβR expression was systematically ablated in specific immune subsets (e.g., B cells, dendritic cells, T cells) to identify which hematopoietic populations drive the observed toxicity reduction.

• The role of estrogen and its receptors in the regulation of ferroptosis and autophagy (2026) · doi

  The paper references estrogen deficiency accelerating atherosclerosis through ferroptosis via NRF2/GPX4 pathway inhibition, but does not specify which estrogen receptor isoform (ERα versus ERβ) mediates this protective effect or whether selective ER modulators can rescue GPX4-dependent ferroptosis resistance.

• Charcoal rot in sesame: infection biology, host resistance mechanism, and genomic-enabled strategies for durable resistance breeding (2026) · doi

  Standardized inoculation and phenotyping protocols for charcoal rot screening in sesame are lacking; current variability in protocols across studies prevents reliable multi-location validation and reproducible identification of resistant donors from landraces and wild materials.

• Genomic analyses implicate hormonal and metabolic dysregulation in polycystic ovary syndrome (2026) · doi

  Mendelian randomization pleiotropy was assessed using MR-EGGER intercept tests and I² heterogeneity metrics, but sensitivity analyses excluding variants with large individual causal estimates or variants mapping to pleiotropic loci were not described; additional pleiotropy robustness checks (e.g., weighted median, mode-based estimation) specific to PCOS hormonal and metabolic pathways are needed.

• Integrative evidence reveals adaptive divergence and speciation in gentoo penguins (2026) · doi

  Genome-wide SNP data from population splits and divergence were analyzed using ASTRAL-III and StarBeast3 (Douglas et al. 2022), but the study does not evaluate how phylogenetic inference results vary under different multispecies coalescent parameterizations or sensitivity to clock model assumptions. Comparative analysis across relaxed clock models and alternative species tree topologies with quantified uncertainty intervals is needed to robustly date speciation events.

• Cancer-associated fibroblasts regulate DNA repair in pancreatic cancer through NDRG1-mediated R-loop processing (2026) · doi

  The RNA-DNA hybrid immunofluorescence protocol using catalytically inactive D210N RNase H1 (dRNH1) as a probe was limited to fixed cells; the dynamic measurement of R-loop formation and NDRG1-dependent resolution in live cancer-associated fibroblasts and pancreatic cancer cells during active DNA replication has not been established.

• Electrophilic compound screening identifies GPX4-dependent ferroptosis as a senescence vulnerability (2026) · doi

  The data-independent acquisition PASEF method for ABPP covers m/z 100–1,700 with ion mobility 1/K0 = 1.30–0.85, but the coverage of low-abundance ferroptosis-regulatory proteins and membrane-associated GPX4 interaction partners may be incomplete. Expansion of the acquisition window or use of targeted DIA for known ferroptosis pathway components is not addressed.

• From parasite-induced immune activation to neuroinflammation and behavioral dysfunction: convergent mechanisms across protozoa and helminths: a review (2026) · doi

  The mechanistic separation between parasite-specific, microbiota-mediated, and immune-driven effects on neuroinflammation remains uncharacterized in polyparasitic infections. Gnotobiotic models and metabolomics approaches are needed to isolate whether cognitive dysfunction in coinfected children (e.g., Ascaris lumbricoides and Ancylostoma duodenale) arises from direct parasitic burden, dysbiotic microbiota shifts, or compounded immune dysregulation.

• The proteomic landscape and temporal dynamics of human and mouse gastruloid development (2026) · doi

  The proteomic landscape was generated from bulk gastruloid tissue; single-cell or spatial proteomics approaches would be required to map cell-type-specific protein expression patterns across the different germ layers (epiblast, mesoderm, endoderm) within gastruloids.

• Decoding Rho GTPase signalling networks in directed cell migration (2026) · doi

  The integration of chemical gradient sensing with Rho GTPase signaling networks for cell polarity orientation has been studied in isolated systems, but the quantitative relationship between chemoattractant concentration gradients and the threshold activation levels of RhoA versus Rac1 needed to maintain directional migration in varying gradient steepnesses remains uncharacterized.

• ​​Integrating machine learning and spatial transcriptomics uncovers shared immunomodulatory deubiquitinases in MAFLD and HCC (2026) · doi

  The mechanism by which EIF3F modulates translational efficiency of lipid metabolism proteins in hepatocytes requires detailed characterization. The proposed role of EIF3F in exacerbating lipid accumulation and oxidative stress through regulation of protein translation efficiency in MAFLD-context has not been mechanistically validated.

• Integrative transcriptomic analysis reveals miR-26a-5p downregulation and a potential predictive gene signature for the progression of metabolic liver disease (2026) · doi

  Single-cell transcriptomics or spatial profiling approaches are necessary to determine the cell-type-specific origin of miR-26a-5p expression and clarify its direct immunomodulatory role in shaping the immune architecture of HCC tumors, as bulk transcriptomic analyses cannot distinguish whether the observed miR-26a-5p and immune-related transcript associations reflect tumor-intrinsic regulation versus differences in tumor cellular composition.

• Dietary N-acetylcysteine enhances sperm motility by remodeling the rumen microbiome and its metabolic axis in goats (2026) · doi

  The optimal NAC dosage was identified at 0.3% in goats, but the dose-response relationship was not systematically characterized across a wider range of concentrations. Testing additional NAC concentrations (e.g., 0.1%, 0.2%, 0.4%, 0.5%) would establish whether the 0.3% optimum represents a true peak or represents an inflection point within a broader dose-response curve affecting the rumen microbiome composition and sperm motility parameters.

• Gut microbiota-driven IL-17/PPAR axis mediates epigallocatechin-induced intestinal repair in weaned lambs (2026) · doi

  The upregulation of AICDA (rate-limiting enzyme for IgA class-switch recombination) and its dysregulation in the IL-17 signaling pathway in response to EGC treatment is mentioned but not fully characterized; the specific IL-17-producing cell populations and their interaction with PPAR-activated intestinal epithelial cells requires flow cytometry and single-cell RNA-seq analysis.

• Adaptation of lipid metabolism of the polyextremophilic cyanobacterium Cyanobacterium aponinum PCC 10605 to adverse environmental conditions (2026) · doi

  The mechanism by which Cyan10605 elongates C14 and C16 fatty acids to C18 fatty acids during nitrogen deprivation remains unexplored. The paper proposes that TAG acyl groups are elongated through one or two rounds of fatty acid elongation reactions under -N conditions, but the specific fatty acid elongase enzymes and their regulation have not been identified or characterized.

• Ethyl methanesulfonate mutagenesis in fungi: genetic mechanisms, applications, and implications for agricultural biotechnology (2026) · doi

  EMS mutagenesis studies in fungi frequently lack genomic validation of induced mutations linked to observed phenotypes. A standardized approach integrating high-resolution sequencing technologies with phenotypic assessment is needed to reliably identify causal mutations and distinguish them from background mutations introduced during the mutagenesis process.

• Early transplantation reshapes desert soil microbiomes and inferred interactions, with irrigation as a stabilizing input (2026) · doi

  A rare Firmicutes–Planctomycetes mutualism was observed via putative cross-feeding (Bacillus substrate breakdown and Planctomycetes by-product removal), but the specific metabolic pathways and metabolite exchanges driving this interaction in irrigated desert soils were not experimentally validated. Targeted metabolomic or metagenomics-based functional assays are needed to confirm the cross-feeding mechanism.

• Comparative genomics identifies small interfering RNA with activity against all five human betacoronaviruses (2026) · doi

  The high genetic diversity within the Betacoronavirus genus (evolutionary distance of 2.0 between SARS-CoV-2 and HCoV-OC43) prevents identification of a single siRNA conserved across all five betacoronaviruses. Computational optimization approaches that relax the 19-mer conservation threshold below the single mismatch currently allowed should be systematically evaluated with rigorous efficacy validation in infection models.

• What causes self-sterility in Couroupita guianensis (Lecythidaceae)? (2026) · doi

  The authors note that comparative in situ pollen tube growth and ovule penetration analyses were limited by the pistil morphology of C. guianensis (almost style-less, short, massive gynoecium with hundreds of ovules). Methodological refinement or alternative approaches are needed to quantitatively assess self-pollen tube inhibition in species with similar morphological constraints to determine whether prezygotic self-incompatibility is truly absent.

• The intrinsically disordered protein SPE-56 is required for acrosomal-like exocytosis and fertility in Caenorhabditis elegans (2026) · doi

  Immunostaining of fixed sperm with anti-MO 1CB4 monoclonal antibodies was restricted to conventional confocal microscopy at 555 nm; super-resolution imaging (STORM, PALM) of MO fusion pore architecture during acrosomal-like exocytosis in SPE-56-deficient males has not been performed.

• Kidney angiopoietin-like protein 4 regulates fibrotic responses in diabetic kidney disease (2026) · doi

  While ANGPTL4 regulation through the MEK/ERK/Nrf-1 autophagy pathway has been demonstrated in renal fibrosis progression, the tissue-specific effects of this pathway in different kidney cell types (podocytes, tubular epithelial cells, fibroblasts) during diabetic nephropathy remain incompletely characterized and require comparative analysis across these compartments.

• Metabolic reprogramming in intervertebral disc degeneration: mechanisms and therapeutic opportunities (2026) · doi

  Ferroptosis has been identified as a potential therapeutic target in intervertebral disc degeneration, but the specific iron-dependent mechanisms triggering ferroptosis in nucleus pulposus cells, the role of lipid peroxidation cascades, and ferroptosis-based therapeutic interventions have not been mechanistically validated in ex vivo disc tissue models.

• Cationic nanoparticles with disrupting neutrophil extracellular traps inhibit the progression of head and neck squamous cell carcinoma (2026) · doi

  The study evaluated NET-DNA effects on HNSCC cell proliferation only within a narrow concentration range (0, 0.5, 1, and 2 μg/mL) across four cell lines (SCC9, SCC15, Cal27, Cal33); systematic dose-response characterization across a broader concentration spectrum and additional HNSCC cell lines is needed to establish the threshold concentration at which NET-DNA directly stimulates tumor cell proliferation.

• Ento-Linguistics: Language, Ambiguity, and Scientific Communication in Entomology: How Terminology Networks Shape Understanding of Insect Biology (And Vice-Versa) (2026) · doi

  The temporal network evolution Δ𝐺(t) framework is defined mathematically but no diachronic analysis is presented showing how entomological terminology networks have evolved over specific time periods (e.g., pre-1990 versus post-2010) or how conceptual mapping strength changes following major taxonomic revisions.

• Society for Developmental Biology 70th Annual Meeting (2011) · doi

  Dynamic fucosylation at the cellular level during zebrafish development (B116) has been detected but lacks spatial mapping of fucosylation patterns relative to specific tissue types and developmental stages; the functional consequences of temporal fucosylation changes on developmental processes remain unclear.