Seroatlas · Human Serome Atlas

CTXN3

Cortexin-3

Also known as: CTXN3_HUMAN

Cross-references: UniProt · Ensembl · Human Protein Atlas · GeneCards · NCBI Gene

Protein identityUniProt · HPA

UniProt accession
Q4LDR2
Gene
CTXN3
Ensembl
ENSG00000205279
Chromosome
5
Canonical length
81 aa
Protein class
Predicted membrane proteins
Subcellular location
Principal piece,End piece

OverviewNCBI Gene

Predicted to be located in membrane. [provided by Alliance of Genome Resources, Jul 2025]

Canonical amino-acid sequenceUniProt

81 residues, UniProt reviewed canonical sequence.

>Q4LDR2|CTXN3
     1  MDGGQPIPSS LVPLGNESAD SSMSLEQKMT FVFVILLFIF LGILIVRCFR ILLDPYRSMP
    61  TSTWADGLEG LEKGQFDHAL A

LocalizationUniProt · AlphaFold · HPA

Whether an antibody against CTXN3 can act on the native protein depends on physical access: surface and secreted proteins are reachable by circulating antibodies, intracellular proteins usually are not.

Antibody reachability
Unknown
Secreted
No
Transmembrane segments
1
Mean surface accessibility (rSASA)
0.56
Highest tissue expression
74 nTPM

Expression across tissuesHPA

Tissue

  • kidney: 74 nTPM
  • cerebral cortex: 20 nTPM
  • skeletal muscle: 12 nTPM
  • midbrain: 12 nTPM
  • pituitary gland: 4.9 nTPM
  • hypothalamus: 4.8 nTPM

Single-cell type

  • corticotrophs: 14 nCPM
  • brain inhibitory neurons: 9.3 nCPM
  • lactotrophs: 7.3 nCPM
  • other brain neurons: 7.2 nCPM
  • thymic myoid cells: 5.4 nCPM
  • brain excitatory neurons: 5 nCPM

Immune cell

  • basophil: 0 nTPM
  • classical monocyte: 0 nTPM
  • eosinophil: 0 nTPM
  • gdT-cell: 0 nTPM
  • intermediate monocyte: 0 nTPM
  • MAIT T-cell: 0 nTPM

Brain region

  • midbrain: 20 nTPM
  • pons: 18 nTPM
  • cerebral cortex: 14 nTPM
  • thalamus: 8.4 nTPM
  • medulla oblongata: 7.2 nTPM
  • hypothalamus: 6 nTPM

Genetic constraint and essentialitygnomAD · DepMap

Does the body need this protein intact? Low LOEUF or a strong DepMap dependency means loss or blockade of the protein is likely to be felt.

gnomAD LOEUF (loss-of-function intolerance)
1.77
gnomAD pLI
0.14
gnomAD missense Z
0.2
DepMap mean gene effect
0.01
DepMap dependency class
selective

Cancer expressionTCGA

Across TCGA tumor cohorts, this protein is over-expressed in roughly 3% of surveyed tumor types (aggregate summary; per-cohort expression, alteration, and survival load in the interactive view).

OntologyGO

Cellular components

Protein domainsUniProt · Pfam · InterPro

KeywordsUniProt

Antibody and autoantibody relevanceSeroatlas analysis

Seroatlas reads CTXN3 as an antibody target. Whether an autoantibody or antibody against CTXN3 could matter depends on whether native CTXN3 is physically reachable, whether the body needs it intact, and whether it acts in a disease-relevant tissue.

CTXN3 is annotated as predominantly intracellular. Intracellular proteins are common autoantibody markers, becoming visible to the immune system after cell injury or altered processing, but are usually markers of disease rather than direct drivers.

Annotation status

The present source text does not explicitly label CTXN3 as an autoantigen. Seroatlas presents hypothesis context only and does not manufacture a known-serology claim.

Canonical record: https://seroatlas.com/gene/CTXN3. Study-independent annotations aggregated from UniProt, Human Protein Atlas, PubMed, IEDB, Pfam, InterPro, Gene Ontology, AlphaFold, gnomAD, DepMap, ClinVar, TCGA. Catalog release seroatlas-reviewed-human-uniprot-20260313.

Seroatlas is the reference for exploring autoantibody and antibody serology at the human-protein level: the autoreactome and human serome, multiplex serology (HuProt, HuScan, VirScan, PhIP-Seq).

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