EN1

Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0005634 nucleus	IBA GO_REF:0000033	ACCEPT	Summary: EN1 is a homeobox transcription factor that acts in the nucleus. Reason: Nuclear activity is intrinsic to EN1's sequence-specific transcriptional regulatory function and is independently supported by direct localization. Supporting Evidence: PMID:24399192 EN1 was expressed in all nuclei (inset) and also in perinuclear areas.
GO:0030182 neuron differentiation	IBA GO_REF:0000033	KEEP AS NON CORE	Summary: Engrailed proteins regulate differentiation and survival in multiple neuronal lineages, including cerebellar excitatory neurons. Reason: The phylogenetic inference is consistent with vertebrate genetics, but neuron differentiation is a developmental outcome of EN1's core transcription-factor activity and is not itself the molecular activity. Supporting Evidence: PMID:38912572 We further reveal a similar function for EN1/2 in mediating TBR2 expression, neuron differentiation and survival in the other excitatory neurons (granule and unipolar brush cells).
GO:0000978 RNA polymerase II cis-regulatory region sequence-specific DNA binding	IBA GO_REF:0000033	ACCEPT	Summary: EN1 directly binds a defined regulatory site in the human UTRN promoter. Reason: Sequence-specific binding to Pol II cis-regulatory DNA is a core activity of this homeodomain transcription factor and is directly demonstrated in vitro and in cells. Supporting Evidence: PMID:21672318 It was found that EN1 binding site 2 in the UTRN gene promoter directly interacted with transcription factor EN1 in vitro.
GO:0000981 DNA-binding transcription factor activity, RNA polymerase II-specific	IBA GO_REF:0000033	ACCEPT	Summary: EN1 binds promoter DNA and regulates target-gene mRNA abundance. Reason: This is the broad core molecular function of EN1 and is supported by direct promoter binding together with transcriptional perturbation. Supporting Evidence: PMID:21672318 Small interfering RNA was used to inhibit EN1 gene expression. Higher utrophin mRNA levels were observed in EN1-inhibited cells compared with controls.
GO:0006357 regulation of transcription by RNA polymerase II	IBA GO_REF:0000033	ACCEPT	Summary: EN1 directly regulates transcription from Pol II promoters. Reason: This biological process is the direct consequence of EN1's DNA-binding transcription-factor activity and is supported experimentally for UTRN. Supporting Evidence: PMID:21672318 Higher utrophin mRNA levels were observed in EN1-inhibited cells compared with controls.
GO:0000981 DNA-binding transcription factor activity, RNA polymerase II-specific	IEA GO_REF:0000002	ACCEPT	Summary: The InterPro homeobox-based inference correctly identifies EN1 as a Pol II transcription factor. Reason: The inferred activity is independently corroborated by promoter-binding and target-transcript experiments.
GO:0003677 DNA binding	IEA GO_REF:0000002	MODIFY	Summary: EN1 binds DNA, but the generic term omits its sequence and regulatory-region specificity. Reason: EN1 is experimentally characterized as a sequence-specific cis-regulatory DNA-binding transcription factor, so the broad DNA-binding term should be replaced by the more informative existing term. Proposed replacements: RNA polymerase II cis-regulatory region sequence-specific DNA binding
GO:0005634 nucleus	IEA GO_REF:0000120	ACCEPT	Summary: Automated nuclear localization agrees with direct EN1 immunolocalization. Reason: Nuclear localization is correct for EN1 and is supported independently by IDA evidence.
GO:0006355 regulation of DNA-templated transcription	IEA GO_REF:0000002	MODIFY	Summary: EN1 regulates DNA-templated transcription, specifically RNA polymerase II transcription. Reason: The annotation is directionally correct but unnecessarily broad because the Pol II-specific process is already established experimentally and phylogenetically. Proposed replacements: regulation of transcription by RNA polymerase II
GO:0008344 adult locomotory behavior	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: En1-deficient mice have motor deficits accompanying progressive dopaminergic-neuron loss. Reason: The transferred phenotype is coherent, but adult locomotion is a distal organism-level consequence rather than EN1's core transcriptional activity. Supporting Evidence: PMID:17267560 Using established protocols, we show that, compared with their wild-type littermates, En1+/- mice have impaired motor skills
GO:0021549 cerebellum development	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: En1/En2 genetics supports cerebellar specification, patterning, and foliation. Reason: The orthology transfer is biologically well supported. Cerebellum development is retained as a context-specific developmental role, distinct from EN1's core DNA-binding transcription-repressor activity. Supporting Evidence: PMID:20081196 Thus, the En genes represent a new class of genes that are fundamental to patterning cerebellum foliation throughout the mediolateral axis and that act late in development.
GO:0030326 embryonic limb morphogenesis	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: Mouse and human genetics support a role for EN1 expression in dorsoventral limb patterning. Reason: The transferred developmental role is strongly corroborated but remains a tissue-specific consequence of EN1 transcriptional regulation rather than a core molecular activity. Supporting Evidence: PMID:8684466 Engrailed-1, a homeodomain-containing transcription factor expressed in embryonic ventral limb ectoderm, is essential for ventral limb patterning.
GO:0030901 midbrain development	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: En1 maintains the isthmic organizer that patterns dopaminergic midbrain and serotonergic hindbrain. Reason: The role is well supported by mouse loss-of-function genetics but represents a regional developmental outcome of EN1 transcriptional regulation. Supporting Evidence: PMID:26879466 Overall, our results suggest that En1 is essential for proper IsO maintenance and function.
GO:0035176 social behavior	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: En1-heterozygous mice show impaired social interactions. Reason: The ortholog phenotype is documented but is a distal behavioral consequence of neuronal dysfunction rather than EN1's core activity. Supporting Evidence: PMID:17267560 they perform poorly in social interactions.
GO:0042220 response to cocaine	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: This term is transferred from a rat ortholog and likely reflects altered dopaminergic-circuit physiology. Reason: The phenotype is plausible given EN1's role in dopaminergic-neuron maintenance, but it is a pharmacological organism-level response and not a core molecular function.
GO:0042756 drinking behavior	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: This mouse-ortholog transfer records a behavioral phenotype downstream of neural dysfunction. Reason: Drinking behavior is retained as non-core because it is an indirect organism-level phenotype, not a defining EN1 molecular activity.
GO:0043524 negative regulation of neuron apoptotic process	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: Reduced En1 dosage causes progressive dopaminergic-neuron loss in adult mice. Reason: The survival role is experimentally coherent, but the transferred process is a context-specific neuronal consequence rather than EN1's core transcriptional activity. Supporting Evidence: PMID:17267560 These loss and gain of function experiments firmly establish that En1/2 is a true survival factor for DA neurons in vivo.
GO:0061743 motor learning	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: The mouse-ortholog annotation is compatible with cerebellar and dopaminergic phenotypes. Reason: Motor learning is a distal neural-system phenotype and is not the core biochemical or transcriptional function of EN1.
GO:1990403 embryonic brain development	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: En1 is required for normal midbrain-hindbrain organizer maintenance and cerebellar formation. Reason: The broad developmental term is supported by ortholog genetics, but it records an anatomical outcome rather than EN1's core transcription-factor activity.
GO:0005654 nucleoplasm	IDA GO_REF:0000052	ACCEPT	Summary: Human Protein Atlas immunofluorescence places EN1 in the nucleoplasm. Reason: Nucleoplasmic localization is consistent with EN1's direct transcription-factor activity and with independent nuclear immunostaining.
GO:1990837 sequence-specific double-stranded DNA binding	IDA PMID:28473536 Impact of cytosine methylation on DNA binding specificities ...	ACCEPT	Summary: EN1 was included in a large methylation-sensitive SELEX analysis of human transcription factors. Reason: The direct high-throughput binding annotation is consistent with EN1's independently demonstrated sequence-specific UTRN-promoter binding. Supporting Evidence: PMID:28473536 By analysis of 542 human TFs with methylation-sensitive SELEX (systematic evolution of ligands by exponential enrichment), we found that there are also many TFs that prefer CpG-methylated sequences.
GO:0000785 chromatin	ISA GO_REF:0000113	ACCEPT	Summary: TFClass inference places the sequence-specific transcription factor EN1 on chromatin. Reason: Chromatin association is appropriate for EN1 and is independently supported by in-cell chromatin immunoprecipitation at a target promoter. Supporting Evidence: PMID:21672318 Chromatin immunoprecipitation assays of the EN1-UTRN promoter complex from rhabdomyosarcoma and HeLa cell lines confirmed that endogenous EN1 interacted with this region in vivo.
GO:0000981 DNA-binding transcription factor activity, RNA polymerase II-specific	ISA GO_REF:0000113	ACCEPT	Summary: TFClass correctly classifies EN1 as a sequence-specific homeobox transcription factor. Reason: The sequence-based classification agrees with direct promoter-binding and transcriptional-perturbation evidence.
GO:0071542 dopaminergic neuron differentiation	TAS PMID:24431302 Wnt signaling in midbrain dopaminergic neuron development an...	UNDECIDED	Summary: The cited review is available only as an abstract, which discusses Wnt signaling in midbrain dopaminergic development but does not state an EN1-specific result. Reason: The cited full-text evidence cannot be checked. Accessible primary evidence clearly supports EN1 in organizer maintenance and dopaminergic-neuron survival, while another study cautions that En1/En2 are not required for initial dopaminergic specification. The precise differentiation annotation therefore cannot be adjudicated confidently. Knowledge gap: The cached source does not reveal which EN1-specific evidence was used to support dopaminergic neuron differentiation rather than survival or regional patterning. OPEN CURATION BP_DARK
GO:0005634 nucleus	IDA PMID:24399192 Differentiation of human epidermal neural crest stem cells (...	ACCEPT	Summary: EN1 immunoreactivity was observed in nuclei of differentiated human dopaminergic neurons. Reason: The full text directly reports nuclear EN1 localization, consistent with its transcription-factor function. Supporting Evidence: PMID:24399192 EN1 was expressed in all nuclei (inset) and also in perinuclear areas.
GO:0000122 negative regulation of transcription by RNA polymerase II	IDA PMID:21672318 A method of utrophin up-regulation through RNAi-mediated kno...	ACCEPT	Summary: EN1 depletion increased UTRN mRNA after direct EN1 binding to the UTRN promoter. Reason: Direct promoter occupancy coupled to increased target transcript after EN1 knockdown supports negative regulation of Pol II transcription. Supporting Evidence: PMID:21672318 Small interfering RNA was used to inhibit EN1 gene expression. Higher utrophin mRNA levels were observed in EN1-inhibited cells compared with controls.
GO:0000978 RNA polymerase II cis-regulatory region sequence-specific DNA binding	IDA PMID:21672318 A method of utrophin up-regulation through RNAi-mediated kno...	ACCEPT	Summary: EN1 directly binds a defined EN1 site in the UTRN promoter in vitro and in cells. Reason: The study directly demonstrates cis-regulatory promoter binding by EN1. Supporting Evidence: PMID:21672318 It was found that EN1 binding site 2 in the UTRN gene promoter directly interacted with transcription factor EN1 in vitro.
GO:0001227 DNA-binding transcription repressor activity, RNA polymerase II-specific	IDA PMID:21672318 A method of utrophin up-regulation through RNAi-mediated kno...	ACCEPT	Summary: EN1 directly occupies the UTRN promoter and represses UTRN transcript accumulation. Reason: The combined binding and knockdown results directly support a Pol II-specific DNA-binding transcription-repressor activity and make this the most informative core MF term. Supporting Evidence: PMID:21672318 The findings suggest that EN1 directly interacts with the UTRN promoter. Small interfering RNA was used to inhibit EN1 gene expression. Higher utrophin mRNA levels were observed in EN1-inhibited cells compared with controls.
GO:0009653 anatomical structure morphogenesis	TAS PMID:8094370 Regional assignment of the human homeobox-containing gene EN...	REMOVE	Summary: The cited human study maps EN1 to chromosome 2q13-q21 but does not test morphogenesis. Reason: The accessible abstract supports chromosomal localization only. It mentions possible developmental importance inferred from mouse expression, but supplies no EN1 morphogenesis experiment or traceable author statement supporting this broad GO term. Supporting Evidence: PMID:8094370 Here, we have refined the localization of EN1 to human chromosome 2q13-q21 using a mapping panel of rodent/human cell hybrids
GO:0001501 skeletal system development	TAS PMID:8684466 The mouse Engrailed-1 gene and ventral limb patterning.	MODIFY	Summary: The cited mouse study specifically demonstrates ventral embryonic limb patterning. Reason: The broad skeletal-system term obscures the experimentally tested process. Embryonic limb morphogenesis is the more accurate replacement and is also supported by human EN1-regulatory deletions. Proposed replacements: embryonic limb morphogenesis Supporting Evidence: PMID:8684466 Loss of Engrailed-1 function in mice results in dorsal transformations of ventral paw structures, and in subtle alterations along the proximal-distal limb axis.

Gene Description

Existing Annotations Review

Core Functions

Binds sequence-specific RNA polymerase II cis-regulatory DNA through its homeodomain and represses target-gene transcription in the nucleus; direct EN1 occupancy of the UTRN promoter restrains UTRN transcript accumulation.

References

Suggested Questions for Experts

Suggested Experiments

📚 Additional Documentation

Notes

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