Methodology gaps in Biology

Representative open questions

Showing 30 of 705 — 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 currently does not fully capture pathway-level contributions to cancer driver gene prediction, as many driver genes function within coordinated modules or pathways that collectively drive oncogenesis rather than acting independently. Future work must extend PICDGI to model cohesive gene networks with high interaction densities to better represent multi-gene regulatory modules in single-cell cancer data.

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

  The HiChew protocol uses custom 96 index primers with GATC sequence avoidance, but the impact of alternative indexing strategies or different restriction enzyme recognition sites on single-cell chromatin conformation capture efficiency and bias remains unexplored.

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

  The protocol specifies Phusion Flash High-Fidelity PCR Master Mix for all reactions, but the paper does not systematically evaluate how polymerase choice, fidelity, or processivity affects off-target mutagenesis rates or the completeness of secondary PCR assembly when using MIDAS-MM or MIDAS-MP with monotemplated designs. Testing alternative polymerases could optimize error rates in the mutagenic primary PCR steps.

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

  The bulk RNA sequencing analysis characterized intrahepatic CD11c+TSLE and CD11c−TSLE cells in response to αCD137 antibody treatment, but the study only sorted these two cell populations from liver tissue. A more comprehensive single-cell RNA sequencing approach across multiple immune cell subsets and tissue compartments would be needed to fully map the transcriptomic changes underlying LTβR blockade-mediated separation of anti-CD137 efficacy from hepatotoxicity.

• Multiple functions of cerebello-thalamic neurons in learning and offline consolidation of a motor skill in mice (2026) · doi

  The pathway-specific chemogenetic inactivation approach using CAV-2 retrograde transduction and DREADDs only targeted cerebellar-thalamic projections to centrolateral (CL) and ventral anterior lateral (VAL) thalamus; the contribution of cerebellar outputs to other thalamic nuclei or non-thalamic targets during motor skill learning and consolidation remains unexplored.

• 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.

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

  While Herman et al. (2024) and Herman & Lynch (2022) model stepping-stone dispersal and age-structured colony establishment in Gentoo Penguins, the study does not quantify how low-coverage genomic sequencing (acknowledged in Kardos & Waples 2024) affects the precision of admixture estimates derived from Dsuite D-statistics. Re-analysis using high-coverage whole-genome sequences for a subset of founders versus colonizers is needed to validate whether admixture signals robust to sequencing depth variation.

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

  DNA fibre spreading experiments used transcription inhibitors α-amanitin and flavopiridol at fixed concentrations (10 mg/ml and 10 µM respectively) to block transcription prior to replication fork stalling; the dose-response relationship and optimal inhibition conditions for studying NDRG1-mediated R-loop resolution during active transcription remain uncharacterized.

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

  Total proteomics data processing in SK-MEL-103 cells uses MaxLFQ quantification with no value imputation, but the effect of missing data on the detection of ferroptosis-related protein abundance changes across senescence conditions (etoposide vs. tozasertib) is not assessed. The paper does not compare imputation strategies that might recover weak signals in GPX4-dependent pathways.

• 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

  Chemical perturbations in gastruloids were limited to MAPKAPK2 inhibition with MK2in1; systematic perturbation of other kinase signaling pathways implicated in gastrulation (e.g., MAPK, Wnt, Nodal pathways) with small-molecule inhibitors during human and mouse RA-gastruloid induction remains unexplored.

• Development and research trends of stay-green biology in legumes: a bibliometric and visual analysis over three decades (2026) · doi

  SGR gene function has been characterized in pea, Arabidopsis, rice, and soybean, but its molecular mechanisms remain incompletely understood across legume species. The interaction between SGR and the PAO (pheophorbide a oxygenase) pathway requires further functional validation in common bean and cowpea to clarify species-specific chlorophyll degradation mechanisms.

• 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.

• 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 study demonstrates correlations between specific microbial taxa (Bacteroides acidifaciens, Romboutsia) and energy/lipid metabolism pathways, but does not establish causality. Microbial transplantation experiments or controlled probiotics administration targeting these specific bacterial taxa are needed to confirm their causal role in NAC-mediated enhancement of sperm motility in goats.

• A standardized workflow for kinetic metabolic model curation and dissemination (2026) · doi

  The kinetic model for crude E. coli lysate metabolism was parameterized using a common modular rate law, but the paper does not systematically compare how different rate law formulations (e.g., Michaelis-Menten vs. Hill equations vs. other mechanistic models) affect model predictions and parameter identifiability in cell-free systems.

• From organelles to therapy: rethinking combined hepatocellular-cholangiocarcinoma (2026) · doi

  Direct organelle profiling in cHCC-CCA patient samples and cell lines using electron microscopy for ultrastructural analysis, organelle proteomics to characterize protein composition, and metabolomics to assess metabolic fluxes has not been systematically performed to establish whether observed organelle abnormalities are representative of the broader cHCC-CCA population.

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

  The role of Ruminococcus bromii in mediating resistant starch degradation and SCFA production through the PI3K/AKT signaling pathway has not been directly tested in weaned lambs; the specific contribution of this keystone species to tight junction protein upregulation via epithelial hypoxia regulation requires targeted knockout or supplementation studies.

• Managing Spinal Muscular Atrophy: A Look at the Biology and Treatment Strategies (2025) · doi

  While SMN protein's roles in RNA processing, axonal mRNA regulation, and actin dynamics have been documented, the integration of these multiple molecular pathways and their relative contribution to motor neuron degeneration in different SMA severity types (Type I, II, III) has not been systematically quantified.

• 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

  Fungal EMS research lacks the standardized, population-scale workflows and curated datasets that characterize plant EMS frameworks. Fungal pipelines remain bespoke, low-throughput, and lack unified whole-genome sequencing-based frameworks, preventing systematic cataloguing of genome-wide mutations and limiting comparability across fungal species and genera.

• 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 study used the SARS-CoV-2 Wuhan strain as the template to define siRNA target sites, which may have excluded conserved 19-mer sequences present in other betacoronavirus strains but absent from the Wuhan reference genome. Systematic screening using alternative betacoronavirus strains as templates should be performed to identify siRNA targets with even higher cross-species conservation.

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

  The study acknowledges that nuclear counts during the free nuclear phase of endosperm development could not be performed in C. guianensis due to its cellular endosperm type, unlike standard methodology used in species with nuclear-type endosperm development. Future work should develop quantitative endosperm development metrics specific to cellular endosperm species to enable more precise comparison of selfed versus crossed seed development trajectories.

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

  The immunoprecipitation protocol using GFP-Trap agarose beads for identifying SPE-56 interacting proteins only recovered binding partners from whole sperm lysates; interaction dynamics during specific stages of acrosomal-like exocytosis (pre-activation, activation, post-fusion) remain uncharacterized.

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

  The cross-enhancement of ANGPTL4 transcription by HIF1α and PPARβ/δ has been characterized at the transcriptional level, but the specific conformational proximity mechanism of the two response elements requires structural validation through crystallography or cryo-EM to determine how these transcription factors physically interact at the ANGPTL4 promoter in diabetic kidney disease contexts.

• Establishing and sustaining mosquito colonies: insights into morphology, bionomics, and advances in the rearing of Anopheles, Culex, and Aedes (2026) · doi

  The paper identifies that improved protocols for genetic management of laboratory mosquito colonies are needed but does not specify which genetic markers, population structures, or breeding strategies should be prioritized for Anopheles, Culex, and Aedes species to maintain field population representation.