Ucn2

Spatial tier: STRICT_EXCLUSIVE · Class: OTHER · Top region: VII (Facial motor nucleus) · Positive regions: 10/554

44.0Discovery Score

33.6Targetability Score

CEvidence grade C

What this means: Ucn2: predicted fine-region profile is strict-exclusive, with 10 positive regions out of 554 (limit 12); direct spatial validation is required.

Function in VII: evidence, prediction, innovation

Gene function

Ucn2 encodes urocortin-2 (stresscopin-related peptide), a 38-amino-acid member of the corticotropin-releasing factor (CRF) family. Unlike CRF it binds selectively to CRF-R2 with essentially no CRF-R1 activity, signalling through Gs and cAMP, and acts in autonomic, appetitive and peripheral (cardiac, skeletal muscle) CRF-R2 pathways.

Region function

The facial motor nucleus (VII) supplies the muscles of facial expression and the mystacial pad, generating whisking and facial reflexes under brainstem and cortical premotor control.

Published in this region

inferred No region-specific literature found. Closest: Ucn2 mRNA was mapped to discrete CNS sites including hypothalamic paraventricular and arcuate nuclei and locus coeruleus (Reyes et al. 2001), while peripherally it is abundant in skeletal muscle (Chen et al. 2004) and critically supports motor axon terminal regeneration at the neuromuscular junction (D'Este et al. 2022).

Predicted function

Prediction: in the facial nucleus Ucn2 would act as a locally released CRF-R2 agonist giving cAMP-dependent trophic support and slow excitability modulation of cholinergic motoneurons, supporting resilience and reinnervation after nerve injury. Knockout or astressin2-B blockade should spare baseline whisking but slow recovery after facial nerve crush; exogenous urocortin-2 should accelerate reinnervation.

Innovation

★★★★☆ 4/5 Urocortin-2 is well characterised in periphery and hypothalamus but never studied in brainstem motor nuclei.

Tools

Ucn2-deficient mice; CRF-R2 antagonists astressin2-B and antisauvagine-30; recombinant urocortin-2; Crhr2 reporter/Cre lines; ChAT-IRES-Cre (JAX 006410); facial nerve crush assay.

References

Direct evidence located at the region

No Allen ISH section could be located at this region's centroid for the recorded experiments.

Look it up yourself: Allen Mouse Brain ISH for Ucn2 Allen reference atlas: VII (structure 661)ABC Atlas MERFISH viewer(in the ABC Atlas choose dataset MERFISH-C57BL6J-638850-CCF, colour cells by gene "Ucn2" or by parcellation_substructure "VII")All genes confined to VII + 3-D brain

Direct spatial evidence

VII MERFISH region locator — Real single-cell MERFISH coordinates for the VII (Facial motor nucleus) section -- our own ground-truth data, showing exactly where this region sits, independent of whether the Allen ISH section below is easy to read.

Regional expression figure

Predicted WMB × fine-CCF profile; not direct full-transcriptome spatial measurement.

Spatial profile

VII

0.132

MOBopl

0.0686

0.0631

DMX

0.0577

0.0535

PPY

0.0511

MOBmi

0.0479

AMBd

0.0452

DTN

0.0451

MOBipl

0.0428

0.0403

0.0391

SCsg

0.0389

SCig

0.0374

PRC

0.0374

RPA

0.0369

PDTg

0.0364

PAS

0.0363

PVHd

0.036

Pa5

0.0359

Evidence and specificity

Evidence status: PREDICTED_FINE
Direct sources: None; predicted localization only
Exclusive threshold: 12 positive regions out of 554
Spatial specificity: 0.296
Top-region fraction: 0.085
Filter status: PASS

Interpretation limits

Cell-type-to-region projection is imputed expression, not direct spatial measurement.
Adult reference atlases do not establish stability across age, sex, strain, state, or disease.
Transcript abundance does not guarantee protein abundance or genetic-tool performance.