CLDN4

(redirected from claudin 4)

CLDN4

A gene on chromosome 7q11.23 that encodes claudin-4, an integral membrane protein of the claudin family, the members of which form part of the tight junction strands and may play a role in embryonic and post-natal organogenesis and function.

Molecular pathology
CLDN4 is deleted in Williams-Beuren syndrome, a multisystem neurodevelopmental disorder.
Mentioned in ?
References in periodicals archive ?
Inhibition of Claudin 4 expression also blocks the formation of the native tight junction.
2, CK [cytokeratin] 7, CK20, CK17, CK19, MUC1, MUC2, MUC4, MUC5AC, MUC6, p53, DPC4/ SMAD4, CDX2, pVHL [von Hippel-Lindau tumor suppressor gene protein], S100P, IMP-3 [insulin-like growth factor 2 messenger RNA binding protein 3], maspin, mesothelin, claudin 4, claudin 18, annexin A8, fascin, PSCA [prostate stem cell antigen], MOC31, CEA [carcinoembryonic antigen], and CA19-9 [cancer antigen 19-9]) in the diagnosis of ductal adenocarcinoma of the pancreas by using 60 cases of pancreatic DAC on routine and tissue microarray (TMA) sections.
2, CK7, CK20, CK17, CK19); (2) mucin gene products (MUC1, MUC2, MUC4, MUC5AC, MUC6); (3) tumor suppressor genes and transcription factors (p53, DPC4/SMAD4, CDX2, pVHL); and (4) tumor-associated proteins (S100P, IMP-3, maspin, mesothelin, claudin 4, claudin 18, annexin A8, fascin, PSCA, MOC31, CEA, CA19-9).
2, CK7, CK19, MUC1, MUC6, CA19-9, MOC31, PSCA, mesothelin, an nexin A8, claudin 4, and claudin 18; (4) normal pancreatic ducts were usually negative for IMP-3, maspin, S100P, CK17, MUC2, MUC4, and MUC5AC; (5) 60% of adenocar cinoma cases showed loss of expression of DPC4/SMAD4; and (6) strong background staining was frequently seen with fascin (including staining for endothelial cells and stromal cells), PSCA, and annexin A8.
Benign ducts were frequently positive for CA19-9, mesothelin, MUC1, MUC6, MOC31, PSCA, claudin 4, and claudin 18, which limits the application of these markers in distinguishing DAC from nonneoplastic pancreatic ducts.
Normal pancreatic ducts and acini are usually positive for MOC31, PSCA, claudin 4, and claudin 18, which limits the application of these markers in the distinction between pancreatic DAC and reactive ducts.