Library · Biology & lab methods

What Conditional Gene Knockout got wrong, from 8 theses

Summary written by a model from the records below: Conditional gene knockout studies across various tissues frequently fail to produce detectable behavioral, metabolic, or biomechanical phenotypes. In other investigations, lineage-specific Cre recombinase timing mismatches and cell-intrinsic deletions fail to achieve targeted receptor deletion or reproduce systemic depletion phenotypes. These records come from graduate theses, 2021 to 2025, each labeled with its degree where the repository states it, and each links to its thesis. They were extracted by language models reading the full text, so treat each as a lead to read, not a verdict.

8
theses
4
institutions
8
failure records
4
failure modes

Plus 1 problems the authors left open, listed at the end.

Failure modes, by theses reporting them

Select a mode to jump to its records.

Metabolic phenotyping under dietary challenge or liver zonation produces no detectable physiological differences
2
2 theses · 2 institutions · 2 records
Conditional knockout in musculoskeletal and cardiac tissues fails to alter biomechanical healing or calcium clearance pathways
2
2 theses · 2 institutions · 2 records
Cell type-specific gene deletion fails to produce expected systemic depletion phenotypes or behavioral learning deficits
2
2 theses · 2 institutions · 2 records
Conditional deletion during development encounters promoter timing mismatches or fails to reduce embryonic proliferation rates
2
2 theses · 2 institutions · 2 records

Metabolic phenotyping under dietary challenge or liver zonation produces no detectable physiological differences

2 theses · 2 institutions

Cell type-specific conditional gene knockout resulted in no detectable alterations in body composition, glucose tolerance, or insulin sensitivity under dietary challenge. Zone-specific conditional gene deletion in liver subpopulations produced little to no observable physiologic phenotype across tested metabolic parameters.

Tried and failed

cell type-specific conditional gene knockout applied to metabolic phenotyping under dietary challenge. Outcome: no signal. Reason: Target gene deletion produced no detectable differences in body composition, glucose tolerance, or insulin sensitivity.

Investigating the role of AHR in adipose tissue and obesity · Imperial

Tried and failed

zone-specific conditional gene deletion for pathway activation applied to subpopulation metabolic signaling in liver. Outcome: no signal. Reason: gene knockout produced little to no observable physiologic phenotype on tested metabolic parameters

Hepatic control of metabolism in health and disease · Harvard · PhD

Conditional knockout in musculoskeletal and cardiac tissues fails to alter biomechanical healing or calcium clearance pathways

2 theses · 2 institutions

Tamoxifen-induced conditional gene knockout showed no measurable effect on biomechanics, collagen realignment, cellularity, or nuclear morphology during post-injury tendon healing. Mitochondrial fusion gene ablation in cardiomyocytes did not alter the relative contributions of calcium efflux mechanisms.

Tried and failed

tamoxifen-induced conditional gene knockout applied to post-injury tendon healing and mechanics. Outcome: no signal. Reason: treatment showed no measurable effect on biomechanics, collagen realignment, cellularity, or nuclear morphology

BIOMECHANICAL EVALUATION OF THE ROLES OF DECORIN AND BIGLYCAN DURING NEONATAL TENDON DEVELOPMENT AND HEALING · Penn · PhD

Tried and failed

conditional gene knockout of fusion proteins applied to cardiomyocyte calcium clearance pathways. Outcome: no signal. Reason: mitochondrial fusion gene ablation did not alter relative contributions of calcium efflux mechanisms

The role of mitochondrial dynamics in the regulation of cardiac calcium signalling · Imperial

Cell type-specific gene deletion fails to produce expected systemic depletion phenotypes or behavioral learning deficits

2 theses · 2 institutions

Loss of the target gene in excitatory neurons using a cell-specific Cre driver did not produce detectable learning impairment in mice. Cell-intrinsic gene deletion in lymphocytes failed to recapitulate the systemic depletion phenotype observed during development and maturation.

Tried and failed

conditional gene knockout using cell-specific Cre driver applied to assessing behavioral learning deficits in mice. Outcome: no signal. Reason: loss of target gene in excitatory neurons did not produce detectable learning impairment

Profiling hotspots of DNA breaks and learning-induced gene expression in the mouse brain · MIT · PhD

Tried and failed

cell type-specific conditional gene knockout applied to lymphocyte development and maturation. Outcome: no signal. Reason: cell-intrinsic gene deletion failed to recapitulate the systemic depletion phenotype

Uncovering a novel role for Duoxa2 in NK cell development · Imperial

Conditional deletion during development encounters promoter timing mismatches or fails to reduce embryonic proliferation rates

2 theses · 2 institutions

Lineage-specific Cre recombinase failed to delete an erythroid progenitor cytokine receptor because the target gene was expressed earlier during differentiation than the promoter driving Cre expression. Loss of mesenchymal signaling ligands through conditional knockout did not reduce developmental proliferation rates in embryonic intestinal epithelium.

Tried and failed

conditional gene knockout via lineage-specific Cre recombinase applied to erythroid progenitor cytokine receptor deletion. Outcome: no signal. Reason: target gene expressed earlier during differentiation than the promoter driving Cre recombinase expression

Interleukin 17A Modulates Erythropoietic Control: Understanding How Inflammatory Signals Tune Stem Cell Systems · Harvard · PhD

Tried and failed

conditional gene knockout of signaling ligands applied to embryonic intestinal epithelial proliferation. Outcome: no signal. Reason: loss of mesenchymal ligand did not reduce developmental proliferation rates

Investigations Of The Gastrointestinal Tract In Development And Disease · Penn · PhD

Left open by the authors

Problems the authors named and did not get to.

Left open

Perturb crypt proliferation pathways using conditional knockouts and profile transcriptomes and hormones of WT versus Pitx2 KO enteroendocrine cells. Blocker: Requires wet lab mouse models, conditional genetic deletion tools, tamoxifen administration, and sequencing/hormonal assay equipment.

THE MANY HATS OF PITX2: FROM EMBRYONIC ORGAN LATERALITY TO ADULT INTESTINAL STEM CELL FUNCTION AND GUT HOMEOSTASIS · Cornell · PhD

Who has worked on this

Authors of the public theses cited on this page, most-cited first.

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