Validation gaps in Biology

Representative open questions

Showing 30 of 486 — 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

  Publicly available efficacy reporting for BI-1701963 remains limited. A snapshot analysis of the BI-1701963 dose-escalation experience in KRAS-mutant solid tumors has been presented at ESMO 2021 (abstract 524P) (Johnson et al., 2021), and additional 'trial in process' updates describing combination cohorts have been disseminated through meeting abstracts (Hofmann et al., 2021).

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

  Reference 69 uses single-cell RNA-seq to reveal AML hierarchies relevant to disease progression, but integration of this transcriptomic data with the spatial localization dynamics between metaphyseal and central marrow regions—and how specific molecular subtypes preferentially localize to distinct niches—has not been performed.

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

  While PICDGI was validated on lung adenocarcinoma (LUAD) and pediatric acute myeloid leukemia (AML) scRNA-seq cohorts, the generalization of PICDGI across additional solid tumor types (e.g., breast cancer, colorectal cancer) and hematologic malignancies (e.g., chronic myeloid leukemia, lymphoma) remains unexplored and should be systematically evaluated.

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

  The post-enrichment approach with Anti-m6A antibody immunoprecipitation is mentioned but lacks detailed validation of enrichment specificity, recovery rates, and potential bias toward particular chromatin regions or modifications in the context of single-cell Hi-C applications.

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

  While the paper demonstrates NanoLuc substrate specificity engineering using MIDAS, no systematic comparison is provided between MIDAS efficiency and competing cell-free or yeast display methods for protein variant screening at equivalent library sizes. Direct benchmarking of variant recovery rates, false-positive frequencies, and throughput per cost would clarify when MIDAS-PM or MIDAS-PP should be preferred over alternative cell-based screening approaches.

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

  The tumor models used MC38 murine colorectal carcinoma cells and MC38-OVA cells, but validation of the LTβR blockade strategy across additional syngeneic tumor types (e.g., melanoma, lymphoma) or human-derived xenografts remains absent. Testing whether selective elimination of circulating effector CD8 T cells via LTβR-Fc generalizes beyond colorectal carcinoma models is necessary for broader therapeutic applicability.

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

  The paper discusses estrogen's modulation of ferroptosis and autophagy in neurodegeneration, cancer, and cardiovascular diseases, but lacks specific mechanistic validation of how estrogen receptor signaling differentially regulates ferroptosis versus autophagy pathways in disease-specific cell types and tissues.

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

  Functional validation of candidate genes underlying sesame resistance to M. phaseolina has not been systematically performed in sesame genetic backgrounds; gene editing and transformation approaches require development of sesame-specific regulatory contexts and validation frameworks.

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

  The PCOS polygenic risk score (PRS) analysis in the Chinese Han ancestry cohort used imputation of missing genotypes as the reference allele for affected loci; validation of this imputation strategy's impact on PRS accuracy and its potential bias in non-European ancestry populations warrants investigation.

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

  The iPOND assay for detecting NDRG1-mediated R-loop processing was only performed with HPAC pancreatic cancer cells; the methodology has not been validated across other pancreatic cancer cell lines or different cancer types to determine whether the NDRG1-DNA repair pathway is broadly applicable or specific to certain genetic backgrounds.

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

  The persistence of behavioral dysfunction after acute parasitic infection resolution requires investigation of long-term epigenetic and transcriptional remodeling via kynurenine pathway activation and microRNA regulation. Current studies lack characterization of whether these neuroinflammatory mechanisms (microRNA, CpG methylation, lncRNA) generate permanent CNS changes or resolve with parasite clearance.

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

  Mouse gastruloids and human RA-gastruloids used different induction protocols, media formulations, and sampling timepoints. Direct proteomic comparison between synchronized mouse and human gastruloid development under standardized culture conditions would clarify species-specific versus conserved proteomic signatures.

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

  Multiple papers report that RhoG regulates Rac1-dependent migration through Dock4 and that RhoJ integrates attractive and repulsive cues in endothelial cells, yet the molecular basis for selective activation of specific Rho GTPase family members in response to identical migratory stimuli across different cell types remains poorly defined.

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

  The proposed epigenetic regulatory functions of EIF3F in MAFLD-to-HCC progression require experimental validation. The hypothesis that EIF3F enhances oncogenic factor expression through epigenetic mechanisms and stabilizes key oncoproteins via deubiquitination in the MAFLD context has not been tested in relevant animal models or patient-derived samples.

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

  Genetic loss-of-function and gain-of-function models are required to validate the functional role of miR-26a-5p in HCC progression, as current in vitro and in vivo data provide correlative but not mechanistic evidence for miR-26a-5p's tumor-suppressive activity in metabolic liver disease.

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

  The intragastric administration of N-methyl-L-asparagine in mice showed enhanced sperm motility, but the authors acknowledge that interspecies differences between mice and goats limit the direct applicability of these findings. Future work must validate the species-specific roles of N-methyl-L-asparagine and D-glutamine in regulating sperm function through goat-based in vitro and in vivo studies before confirming their functional contribution to the rumen–plasma–sperm axis in ruminants.

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

  The metabolic cross-feeding network between Ruminococcus bromii and Limosilactobacillus reuteri/Lactobacillus amylovorus is speculated based on correlation analysis, but direct in vitro co-culture experiments and metabolic flux analysis have not been performed to confirm the mechanistic basis of this synergistic interaction in the context of weaning stress.

• Self-organisation of complex dynamical systems: from synergetics to neuromorphic systems (2026) · doi

  The paper discusses how locally-passive memristors could model synaptic efficacies and long-term potentiation in neuromorphic systems, but does not specify experimental protocols or quantitative metrics for validating memristor-based circuit implementations against biological synaptic strength adjustment mechanisms in Hodgkin-Huxley neural models.

• Proteogenomic decoding of chemotherapy resistance in patients with triple-negative breast cancer (2026) · doi

  The stable cell lines with integrin β8-GFP transfection were used but the paper does not report functional assays (migration, invasion, adhesion) or mechanistic validation that integrin β8 expression directly contributes to the chemotherapy resistance phenotypes identified in the proteogenomic clustering.

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

  The functional role of the unusually high proportion of C16 fatty acids in SQDG (16:0–16:0, 16:0–16:1 species) compared to other membrane lipids in Cyan10605 has not been tested. While the high SQDG/PG ratio is proposed to reflect adaptation to extreme thermal spring environments, the specific advantages of C16-enriched SQDG for maintaining photosynthesis under phosphate deprivation in this polyextremophile remain uncharacterized compared to the reference observation in SQDG-deficient mutants of T. elongatus.

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

  EMS-derived pathogenicity studies in fungal pathogens remain predominantly small-scale and isolate-specific with limited replication and short-term infection assays. Long-term trait stability, environmental performance, and ecological relevance are rarely assessed, necessitating integration with genome-wide mutation profiling and environmentally relevant challenge assays to establish clearer linkage between induced mutations and disease outcomes in agricultural contexts.

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

  The authors used co-occurrence network analysis and generalized Lotka-Volterra (gLV) modeling to infer microbial interactions, but seedling performance and actual microbial metabolic functions were not directly measured. Direct validation requires linking inferred interaction states to plant establishment outcomes through survival and growth metrics combined with functional assays (metagenomics or targeted biochemical tests).

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

  The study identified si117m as a lead candidate with broad coverage of pandemic HCoVs but acknowledged that siRNA cocktail combinations could expand antiviral spectrum and increase resistance barrier. Specific combinations of si117m with si123m and si128m targeting the RdRp catalytic center should be experimentally validated in replication-competent infection models across all five betacoronaviruses.

• Effects of host migration and travel loss on strain competition in a two-patch SIR model (2026) · doi

  The model structure assumes the same form of contact rates (β) and recovery rates (γ, α) for both strains within each patch; sensitivity analysis on how strain-specific differences in transmissibility and virulence affect the strain competition outcomes under migration is absent.

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

  The FM 1-43 lipophilic membrane dye assay for detecting MO fusion pores in C. elegans spermatozoa has not been directly compared with alternative membrane fusion detection methods (e.g., patch-clamp electrophysiology, total internal reflection fluorescence microscopy) to validate the specificity and sensitivity of punctate fluorescence localization as a fusion indicator.

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

  ANGPTL4 has been shown to antagonize Wnt signaling through LRP6 turnover, but whether this mechanism is active in diabetic kidney disease and how it intersects with ANGPTL4-mediated fibrotic responses through other pathways (PPARγ, STAT6) requires direct investigation using kidney-specific disease models.

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

  The metabolomic signature and molecular profile of normal versus degenerated human intervertebral disc cells has been characterized, but comparative metabolomic analysis across different degeneration grades (Pfirrmann classification) and the validation of identified metabolic biomarkers in longitudinal clinical cohorts is lacking.

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

  The in vivo efficacy of cNP combined with anti-PD-1 was demonstrated only in a C3H tumor-bearing mouse model; validation in additional HNSCC xenograft or syngeneic models with different genetic backgrounds and in spontaneous tumor models would strengthen the generalizability of the combination therapy approach.

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

  The CACE scoring framework (Clarity, Appropriateness, Consistency, Evolvability) fixes the high-entropy threshold at 2.0 bits and k-means clustering at k_max = 5; validation of these hyperparameter choices across different entomological subdisciplines (morphology, behavior, ecology, systematics) and corpus sizes is not reported.

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

  The role of FoxD3 in maintenance of pluripotency and early lineage segregation in human embryonic stem cells (B127) has not been validated at the chromatin level; genome-wide binding sites and target gene networks controlled by FoxD3 remain to be systematically mapped in hESCs.