Every NR4A2 paper, in plain English

Variability in Behavioral Phenotypes after Forced Swimming-Induced Stress in Rats Is Associated with Expression of the Glucocorticoid Receptor, Nurr1, and IL-1β in the Hippocampus.

Ruiz-Sánchez E, López-Ramírez AM, Ruiz-Chow Á, Calvillo M, Reséndiz-Albor AA, Anguiano B, Rojas P

This study finds that vulnerable rats exhibit higher levels of Nurr1 protein in the hippocampus after stress compared to resilient rats. It suggests Nurr1 acts as a mediator in the biological response to acute stress rather than indicating a direct therapeutic target for NR4A2-related syndromes.

• Vulnerable rats show higher hippocampal Nurr1 protein levels after stress than resilient rats.
• Nurr1 mRNA levels do not differ significantly between vulnerable and resilient groups.
• The study links Nurr1 to stress coping mechanisms in an animal model.
• No human data or clinical implications for NR4A2 syndromes are presented.

Effects of Training Status and Exercise Mode on Global Gene Expression in Skeletal Muscle.

Bizjak DA, Zügel M, Treff G, Winkert K, Jerg A, Hudemann J, Mooren FC, Krüger K, Nieß A, Steinacker JM

This study found that acute exercise, especially endurance or strength training, strongly activates NR4A2 and related genes in muscle, more so than training status. The NR4A family genes, including NR4A2, were the most upregulated in response to exercise, suggesting they play a key role in muscle adaptation. Training level had little effect on gene expression compared to the type of exercise performed.

• NR4A2 is highly activated by acute exercise in muscle
• Exercise mode (endurance vs. strength) affects gene expression more than training level
• NR4A genes are central to muscle adaptation
• Gene changes peak 3 hours after exercise
• NR4A2 may help guide personalized training strategies

Nr4a2 Transcription Factor in Hippocampal Synaptic Plasticity, Memory and Cognitive Dysfunction: A Perspective Review.

Català-Solsona J, Miñano-Molina AJ, Rodríguez-Álvarez J

This perspective review discusses the role of the Nr4a2 transcription factor in hippocampal synaptic plasticity and memory formation. It suggests that dysregulation of this protein may contribute to cognitive dysfunction in brain pathologies like Alzheimer's disease. The authors propose Nr4a2 as a potential therapeutic target for conditions involving cognitive decline.

• Nr4a2 regulates gene transcription essential for synaptic plasticity and memory consolidation.
• Hippocampal synaptic dysfunction linked to Nr4a2 underlies cognitive decline in disorders like Alzheimer's.
• The review highlights Nr4a2 as a potential novel therapeutic target for cognitive dysfunctions.
• Molecular mechanisms of Nr4a2 in the hippocampus remain poorly understood.

NR4A2 alleviates cardiomyocyte loss and myocardial injury in rats by transcriptionally suppressing CCR5 and inducing M2 polarization of macrophages.

Miao H, Li X, Zhou C, Liang Y, Li D, Ji Q

NR4A2 protects heart cells in rats with diabetic heart disease by suppressing a specific inflammatory receptor called CCR5. This mechanism reduces harmful immune cell activity and prevents damage to heart muscle tissue.

• NR4A2 levels drop in rat hearts affected by diabetes.
• Restoring NR4A2 protects heart cells from high-sugar damage.
• NR4A2 works by turning down the CCR5 inflammatory receptor.
• This study focuses on heart injury, not brain or movement disorders.

The Different Molecular Code in Generation of Dopaminergic Neurons from Astrocytes and Mesenchymal Stem Cells.

Wang N, Ji X, Wu Y, Zhou S, Peng H, Wang J, Yu S, Zhang J

This study compares how well astrocytes and mesenchymal stem cells convert into dopamine-producing neurons in a lab setting. It finds that astrocytes are more efficient at this conversion than stem cells when exposed to specific molecular signals.

• Astrocytes convert to dopamine neurons more efficiently than stem cells.
• The study uses only cell cultures, not animals or humans.
• It identifies different molecular requirements for each cell type.
• No clinical treatments or patient outcomes are reported.

Current Status of the Hypothesis of a Claustro-Insular Homolog in Sauropsids.

Puelles L

This paper discusses the evolutionary origins of brain structures by comparing how the gene Nr4a2 marks specific regions in birds and reptiles versus mammals. It does not provide clinical data, treatment options, or direct insights into human NR4A2-related syndromes.

• The study focuses on comparative neuroanatomy across species rather than human disease.
• Nr4a2 serves as a molecular marker for identifying homologous brain regions in birds and reptiles.
• No clinical evidence, patient data, or therapeutic strategies are presented.
• The research addresses evolutionary biology questions about pallial development.

The Distribution, Expression Patterns and Functional Analysis of NR1D1 and NR4A2 in the Reproductive Axis Tissues of the Male Tianzhu White Yak.

Dai L, Zhang Q, Shi J, Bai X, An X, Zhang B, Zhang Y, Zhao X

NR4A2 and NR1D1 are active in male yak reproductive tissues, especially in testes and Leydig cells, where they help regulate steroid and androgen production. Their expression changes with age and varies between tissues, suggesting a key role in male fertility and hormone control.

• NR4A2 is highly active in testes and Leydig cells
• NR4A2 and NR1D1 levels rise at age 6 in testes
• These receptors regulate steroid and androgen metabolism
• NR4A2 may directly influence hormone synthesis
• Expression differs across reproductive tissues

NR4A2 expression is not altered in placentas from cases of growth restriction or preeclampsia, but is reduced in hypoxic cytotrophoblast.

de Alwis N, Beard S, Binder NK, Pritchard N, Kaitu'u-Lino TJ, Walker SP, Stock O, Groom KM, Petersen S, Henry A, Said JM, Seeho S, Kane SC, Tong S, Hannan NJ

This study finds that NR4A2 levels in placental tissue do not change in pregnancies complicated by growth restriction or preeclampsia, despite higher levels being found in the blood of these patients. The research suggests that circulating NR4A2 likely originates from outside the placenta, as experimental hypoxia only reduced NR4A2 in isolated cells and did not alter key placental growth factors.

• Placental NR4A2 expression remains unchanged in preterm growth restriction and preeclampsia cases.
• Circulating NR4A2 transcripts are elevated in these pregnancies, suggesting a non-placental source.
• Hypoxia reduces NR4A2 only in isolated cytotrophoblast cells, not in whole placental tissue.
• Silencing NR4A2 in cells alters stress and inflammatory genes but not angiogenic factors.

Characterization and Study of Gene Expression Profiles of Human Periodontal Mesenchymal Stem Cells in Spheroid Cultures by Transcriptome Analysis.

Suga T, Usui M, Onizuka S, Sano K, Sato T, Nakazawa K, Ariyoshi W, Nishihara T, Nakashima K

NR4A2 is highly active in 3D cultures of human periodontal stem cells and acts as a brake on bone formation. When NR4A2 is reduced, these cells produce more bone-related proteins and form larger calcified structures, suggesting NR4A2 normally suppresses bone development in this context.

• NR4A2 is strongly expressed in 3D stem cell cultures
• Reducing NR4A2 boosts bone formation markers
• NR4A2 suppresses osteogenesis in these cells
• No effect on fat or cartilage formation
• Spheroid culture enhances NR4A2's role in bone regulation

The Possible Protective Role of Dark Chocolate Against Acrylamide Neurotoxicity in Weaning Rats Cerebellum.

Hassan DM, Welson NN, Yassa HD

Dark chocolate may protect the developing brain from damage caused by acrylamide, a chemical found in some cooked foods, by boosting levels of a key brain-protective gene called NR4A2. In rats, dark chocolate reduced brain cell damage and helped restore gene activity linked to nerve health.

• Dark chocolate reduced brain cell damage from acrylamide
• NR4A2 gene expression increased with dark chocolate
• Acrylamide harms developing brain cells
• Dark chocolate may help protect against dietary toxins
• Findings suggest a possible protective dietary strategy

Development and Profiling of Inverse Agonist Tools for the Neuroprotective Transcription Factor Nurr1.

Zaienne D, Willems S, Schierle S, Heering J, Merk D

Researchers developed chemical tools that block the Nurr1 protein's activity in cell cultures. These compounds reduce the expression of genes controlled by Nurr1 and alter inflammatory responses in astrocytes. This work provides new laboratory instruments to study how Nurr1 functions in disease models.

• Indole-based inverse agonists block Nurr1 transcriptional activity by over 90%.
• Compounds disrupt Nurr1 homodimers and displace corepressor proteins.
• Treatment mimics the effects of silencing the NR4A2 gene in cells.
• Reduced Nurr1 activity lowers interleukin-6 release in human astrocytes.
• These tools help probe Nurr1 roles in neuroinflammation and cancer research.

α-Synuclein Induces the GSK-3-Mediated Phosphorylation and Degradation of NURR1 and Loss of Dopaminergic Hallmarks.

García-Yagüe ÁJ, Lastres-Becker I, Stefanis L, Vassilatis DK, Cuadrado A

This study explains how alpha-synuclein, a protein linked to Parkinson's disease, triggers the destruction of NURR1 through a specific phosphorylation pathway. It identifies the exact region of the NURR1 protein that is targeted for degradation by GSK-3 kinase.

• Alpha-synuclein activates GSK-3 kinase to phosphorylate NURR1.
• Phosphorylation marks NURR1 for ubiquitination and proteasomal degradation.
• Amino acids 123-134 of NURR1 are the specific target site.
• This mechanism explains NURR1 loss in synucleinopathies like Parkinson's.

The Impact of CB1 Receptor on Nuclear Receptors in Skeletal Muscle Cells.

Haddad M

Stimulating CB1 receptors in skeletal muscle cells increases the expression of NR4A1 and NR4A3 genes, while blocking these receptors reduces the expression of NR4A1, NR4A2, and NR4A3. This study identifies a molecular link between cannabinoid signaling and NR4A family gene regulation in muscle tissue. The findings do not provide clinical evidence or treatment options for NR4A2-related syndromes.

• CB1 receptor stimulation increases NR4A1 and NR4A3 mRNA in skeletal muscle cells.
• Blocking CB1 receptors decreases NR4A1, NR4A2, and NR4A3 expression.
• The study uses mouse muscle cell lines, not human patients or animal models of disease.
• No clinical relevance to NR4A2 syndrome symptoms or treatment is established.

Selymatra: A web application for protein-profiling analysis of mass spectra.

Nardone D, Ciaramella A, Cerreta M, Pulcrano S, Bellenchi GC, Leone L, Manco G, Febbraio F

This paper describes a software tool for analyzing mass spectrometry data to identify proteins, rather than providing new medical insights or treatments. The application was tested using cells that overexpress the NURR1 protein to demonstrate its ability to detect tagged versions of the receptor. It does not offer clinical guidance or evidence regarding NR4A2-related syndromes.

• The study presents a web application for automated protein identification from mass spectra.
• Researchers validated the tool using cells overexpressing a tagged NURR1 receptor.
• The software compares sample and control spectra to predict likely proteins.
• No clinical data, patient outcomes, or treatment effects are reported.
• The work is purely computational and methodological with no therapeutic relevance.

A systematic dissection of human primary osteoblasts in vivo at single-cell resolution.

Gong Y, Yang J, Li X, Zhou C, Chen Y, Wang Z, Qiu X, Liu Y, Zhang H, Greenbaum J, Cheng L, Hu Y, Xie J, Yang X, Li Y, Bai Y, Wang YP, Chen Y, Tan LJ, Shen H, Xiao HM, Deng HW

This study maps the different types of bone-forming cells in humans and identifies a rare subtype that produces high levels of NR4A2. It confirms that human bone cells differ significantly from mouse bone cells, highlighting the limitations of using mice to understand human biology.

• Researchers identified three distinct subtypes of human osteoblasts using single-cell sequencing.
• A rare osteoblast subtype serves as the primary source of NR4A2 in bone tissue.
• The study reveals significant transcriptional differences between human and mouse osteoblasts.
• Preosteoblasts and a rare subtype regulate angiogenesis and blood cell formation.
• Findings emphasize the need for human-specific models over mouse models for bone research.

Minireview: What is Known about SUMOylation Among NR4A Family Members?

Dodat F, Mader S, Lévesque D

This review explains how SUMOylation, a chemical modification of proteins, regulates the activity of NR4A family transcription factors including NURR1. It details the molecular mechanisms by which this process influences cellular functions such as inflammation and neuronal health without proposing specific treatments for patients.

• NR4A receptors are orphan nuclear receptors lacking known endogenous ligands.
• SUMOylation dynamically regulates NR4A transcriptional activity and function.
• The review covers impacts on cell cycle, apoptosis, and inflammation.
• No clinical data or treatment implications for NR4A2 syndrome are presented.

Reconstruction of the Cytokine Signaling in Lysosomal Storage Diseases by Literature Mining and Network Analysis.

Parolo S, Tomasoni D, Bora P, Ramponi A, Kaddi C, Azer K, Domenici E, Neves-Zaph S, Lombardo R

This study uses computational analysis to map inflammatory signaling pathways in three lysosomal storage diseases, identifying NR4A2 as a potential regulator of cytokine production in Gaucher disease. The research highlights complex inflammatory networks that may serve as targets for future anti-inflammatory therapies in these conditions.

• NR4A2 appears as a candidate regulator in the monocyte cytokine network for Gaucher disease.
• The study focuses on sphingolipid accumulation disorders, not NR4A2-related syndromes.
• Findings are based on literature mining and network analysis, not experimental validation.
• No human clinical data or treatment outcomes for NR4A2 variants are presented.

Propofol protects H9C2 cells against hypoxia/reoxygenation injury through miR-449a and NR4A2.

Qian Q, Xie Y

This study shows that propofol protects heart cells from oxygen-deprivation damage by regulating specific molecular pathways involving NR4A2. The findings are based entirely on experiments with rat heart muscle cells in a laboratory dish.

• Propofol reduces cell death and boosts survival in heart cells exposed to low oxygen.
• The protective effect relies on increasing NR4A2 levels by suppressing miR-449a.
• Blocking NR4A2 eliminates the benefits of propofol treatment.
• Research uses only rat heart cell lines, not human subjects or animal models.

Identification of the Crucial Gene in Overflow Arteriovenous Fistula by Bioinformatics Analysis.

Zhao Z, Fu Q, Hu L, Liu Y

This bioinformatics study identifies NR4A2 as one of ten hub genes associated with intimal hyperplasia in arteriovenous fistulas, a condition involving abnormal blood vessel thickening. The research focuses on vascular remodeling and inflammation pathways rather than neurological development or function.

• NR4A2 appears as a hub gene in bioinformatics analysis of AV fistula tissue.
• The study links NR4A2 to MAPK signaling in vascular contexts, not the brain.
• No human clinical data or patient phenotypes are presented.
• Findings relate to blood vessel stenosis, unrelated to NR4A2 syndrome symptoms.

Bisphenol A exposure induces neurobehavioral deficits and neurodegeneration through induction of oxidative stress and activated caspase-3 expression in zebrafish brain.

Sahoo PK, Aparna S, Naik PK, Singh SB, Das SK

Chronic exposure to Bisphenol A causes neurodegeneration and motor dysfunction in zebrafish by triggering oxidative stress and cell death. The study observes a significant decrease in Nurr1, the protein encoded by NR4A2, alongside other dopaminergic markers.

• BPA exposure reduces Nurr1 levels in zebrafish brains.
• The chemical induces motor deficits and Parkinson-like symptoms.
• Neurodegeneration involves oxidative stress and increased cell death.
• This is a preclinical animal model study, not human research.

Modified UCN2 peptide treatment improves skeletal muscle mass and function in mouse models of obesity-induced insulin resistance.

Borg ML, Massart J, De Castro Barbosa T, Archilla-Ortega A, Smith JAB, Lanner JT, Alsina-Fernandez J, Yaden B, Culver AE, Karlsson HKR, Brozinick JT, Zierath JR

This study shows that a modified peptide improves muscle mass and function in mice with obesity or immobilization. The treatment increases the expression of Nr4a2, among other genes, suggesting it modulates muscle protein synthesis and degradation pathways.

• Modified UCN2 peptide increases skeletal muscle mass in obese and immobilized mice.
• Treatment upregulates Nr4a2 expression in mouse skeletal muscle tissue.
• The therapy prevents force loss from disuse and reduces muscle wasting.
• Effects involve modulation of anabolic and catabolic signaling pathways.

Developmental Inhibition of Long Intergenic Non-Coding RNA, HOTAIRM1, Impairs Dopamine Neuron Differentiation and Maturation.

Cui X, Pertile RAN, Du Z, Wei W, Sun Z, Eyles DW, Kesby JP

Inhibiting the long non-coding RNA HOTAIRM1 disrupts the development and maturation of dopamine neurons in both human cell lines and mouse models. This study identifies HOTAIRM1 as a critical regulator of early dopamine neuron specification, distinct from the NR4A2 transcription factor pathway.

• HOTAIRM1 inhibition reduces key dopamine neuron specification factors.
• The study uses human neuroblastoma cells and mouse embryos.
• Results link HOTAIRM1 to broader neurodevelopmental disorders like schizophrenia.
• No direct connection to NR4A2 variants or human clinical data is shown.

Construction of Competing Endogenous RNA Networks Incorporating Transcription Factors to Reveal Differences in Granulosa Cells from Patients with Endometriosis.

Wu R, Li J, Li J, Zhang N, Zhou W, Ren L, Chen Q, Li Y

This study identifies NR4A2 as a key gene within a regulatory network in granulosa cells from patients with endometriosis. The findings describe molecular differences in ovarian tissue related to infertility, not neurological development or function.

• NR4A2 appears in a ceRNA network in human granulosa cells from endometriosis patients.
• The study focuses on infertility mechanisms, not NR4A2-related neurodevelopmental syndromes.
• No clinical data, treatments, or neurological phenotypes for NR4A2 children are presented.

Retraction.

This paper was retracted because its data images were duplicated from other studies, making the results unreliable and the conclusions invalid.

• The study's data were found to be duplicated
• Results cannot be trusted due to image manipulation
• Conclusions are no longer valid
• The paper was officially retracted

Transcriptional Profiling of Monocytes Deficient in Nuclear Orphan Receptors NR4A2 and NR4A3 Reveals Distinct Signalling Roles Related to Antigen Presentation and Viral Response.

Phelan DE, Shigemura M, Aldhafiri S, Mota C, Hall TJ, Sznajder JI, Murphy EP, Crean D, Cummins EP

This study examines how NR4A2 and NR4A3 proteins influence immune cell function in monocytes, specifically regarding antigen presentation and viral responses. It provides mechanistic insights into these receptors' roles outside the nervous system but does not address their impact on neurodevelopment or motor symptoms relevant to your child.

• NR4A2 regulates antigen processing and MHC gene expression in monocytes.
• NR4A3 primarily influences pathways related to viral responses.
• Both receptors play common roles in regulating cell migration.
• The study uses RNA-sequencing on immune cells, not neural tissue.
• Findings focus on immunology rather than neurological development or function.

Analogs of the Dopamine Metabolite 5,6-Dihydroxyindole Bind Directly to and Activate the Nuclear Receptor Nurr1.

Kholodar SA, Lang G, Cortopassi WA, Iizuka Y, Brah HS, Jacobson MP, England PM

Researchers identified a stable chemical analog that directly activates Nurr1, the protein affected by NR4A2 mutations. This compound stimulates the production of dopamine-related genes in laboratory settings.

• The study uses cell-based assays to test chemical binding to Nurr1.
• No human patients or animal models are included in this research.
• Findings do not demonstrate clinical efficacy or safety for treatment.

Efficient generation of dopaminergic induced neuronal cells with midbrain characteristics.

Ng YH, Chanda S, Janas JA, Yang N, Kokubu Y, Südhof TC, Wernig M

Researchers demonstrate that combining specific transcription factors efficiently converts stem cells into functional midbrain-like dopaminergic neurons. This method improves the reproducibility and authenticity of these cells compared to traditional differentiation techniques. The study provides a robust protocol for generating these specific neuron types in both mouse and human models.

• Combining Ascl1, Lmx1a, Nurr1, En1, FoxA2, and Pitx3 generates functional midbrain dopaminergic neurons.
• Transcription factor programming yields synchronous and efficient differentiation from pluripotent stem cells.
• The approach works for both mouse and human induced neuronal cells.
• Complex factor combinations are necessary for proper regional specification of induced neurons.

Matrigel enhances differentiation of human adipose tissue-derived stem cells into dopaminergic neuron.

Absalan F, Pasandi MS, Ghasemi Hamidabadi H, Saeednia S, Bojnordi MN, Zahiri M, Alizadeh R, Bagher Z

This study shows that human stem cells from fat tissue can turn into dopamine-producing neurons when grown in a specific gel, suggesting potential for Parkinson's disease modeling. It does not test treatments on people with NR4A2-related syndromes or address the genetic mechanisms relevant to this child.

• Human adipose stem cells differentiate into dopaminergic neurons in 3D Matrigel culture.
• Cells grown in Matrigel show higher survival and dopamine release than standard cultures.
• The study focuses on Parkinson's disease models, not NR4A2-related neurodevelopmental disorders.
• No clinical trials or human patient data for NR4A2 variants are included.

Inhibition of miR-145-5p Reduces Spinal Cord Injury-Induced Inflammatory and Oxidative Stress Responses via Affecting Nurr1-TNF-α Signaling Axis.

Jiang L, Wei ZC, Xu LL, Yu SY, Li C

Inhibiting miR-145-5p reduces inflammation and oxidative stress in spinal cord injury models by restoring Nurr1 levels and blocking TNF-α signaling. This study demonstrates a molecular mechanism where miR-145-5p directly targets Nurr1, but it does not test treatments for NR4A2-related syndromes or human patients.

• The study uses rat spinal cord injury models and cell cultures, not human participants.
• Inhibiting miR-145-5p increases Nurr1 expression and reduces inflammatory markers.
• Nurr1 acts as a direct target of miR-145-5p in this specific pathway.
• The findings relate to spinal cord injury mechanisms, not NR4A2 syndrome treatment.

LMK235, a small molecule inhibitor of HDAC4/5, protects dopaminergic neurons against neurotoxin- and α-synuclein-induced degeneration in cellular models of Parkinson's disease.

Mazzocchi M, Goulding SR, Wyatt SL, Collins LM, Sullivan AM, O'Keeffe GW

The HDAC4/5 inhibitor LMK235 protects dopaminergic neurons from degeneration in cell and tissue culture models of Parkinson's disease. This protection occurs through increased histone acetylation and activation of BMP-Smad signaling pathways.

• LMK235 inhibits HDAC4 and HDAC5 enzymes in laboratory cell models.
• Treatment increases neurite outgrowth in human SH-SY5Y cells and rat midbrain neurons.
• LMK235 prevents neuron death caused by the toxin MPP+.
• LMK235 protects against alpha-synuclein-induced axonal degeneration in culture.
• Effects require BMP-Smad-dependent transcription signaling.

The molecular and epigenetic mechanisms of innate lymphoid cell (ILC) memory and its relevance for asthma.

Verma M, Michalec L, Sripada A, McKay J, Sirohi K, Verma D, Sheth D, Martin R, Dyjack N, Seibold MA, Knapp JR, Tu TH, O'Connor BP, Gorska MM, Alam R

This study investigates how innate lymphoid cells develop memory responses in asthma using mouse models and cellular analysis. It identifies specific genetic and epigenetic mechanisms, including the role of Nr4a2, that drive allergic inflammation in the lungs.

• Researchers use mouse models to study immune memory in asthma.
• The paper focuses on innate lymphoid cells, not dopaminergic neurons.
• Nr4a2 appears as a gene regulator within immune cell pathways.
• Findings relate to allergic airway disease mechanisms in mice.
• No human clinical data or NR4A2 syndrome treatment is presented.

Nurr1 deficiency shortens free running period, enhances photoentrainment to phase advance, and disrupts circadian cycling of the dopamine neuron phenotype.

Partington HS, Nutter JM, Eells JB

Nurr1 deficiency disrupts the natural daily cycling of dopamine neuron numbers and alters circadian rhythms in mice. This suggests that normal Nurr1 function is required to maintain healthy fluctuations in dopamine systems throughout the day.

• Nurr1-deficient mice show shorter free-running circadian periods.
• These mice entrain faster to phase-advanced light shifts.
• Normal dopamine neuron numbers fluctuate significantly across the day.
• Nurr1 deficiency eliminates this daily cycling of dopamine neurons.
• Fewer dopamine neurons are present at specific times in deficient mice.

Controlling for activity-dependent genes and behavioral states is critical for determining brain relationships within and across species.

Biegler MT, Cantin LJ, Scarano DL, Jarvis ED

NR4A2 expression levels change based on brain activity and behavior, meaning it cannot reliably map brain structure or identify homologous regions across species. This finding clarifies that NR4A2 is an activity-dependent marker rather than a stable structural identifier in the brain.

• NR4A2 is an activity-dependent gene, not a fixed structural marker.
• Behavioral state significantly alters NR4A2 expression patterns in the brain.
• Previous homology maps using NR4A2 are likely inaccurate or incomplete.
• This study focuses on comparative anatomy, not human disease mechanisms.
• The paper does not address NR4A2 mutations or clinical phenotypes.