crumbs homolog 3 (Drosophila); Involved in the establishment of cell polarity in mammalian epithelial cells. Regulates the morphogenesis of tight junctions (123 aa)

par-6 partitioning defective 6 homolog alpha (C. elegans); Adapter protein involved in asymmetrical cell division and cell polarization processes. Probably involved in the formation of epithelial tight junctions. Association with PARD3 may prevent the interaction of PARD3 with F11R/JAM1, thereby preventing tight junction assembly. The PARD6-PARD3 complex links GTP-bound Rho small GTPases to atypical protein kinase C proteins (346 aa)

claudin 1; Plays a major role in tight junction-specific obliteration of the intercellular space, through calcium- independent cell-adhesion activity (By similarity). Acts as a co- receptor for HCV entry into hepatic cells (211 aa)

acid-sensing (proton-gated) ion channel 3; Cation channel with high affinity for sodium, which is gated by extracellular protons and inhibited by the diuretic amiloride. Generates a biphasic current with a fast inactivating and a slow sustained phase. In sensory neurons is proposed to mediate the pain induced by acidosis that occurs in ischemic, damaged or inflamed tissue. May be involved in hyperalgesia. May play a role in mechanoreception. Heteromeric channel assembly seems to modulate channel properties (549 aa)

tight junction protein 3 (952 aa)

angiomotin; Plays a central role in tight junction maintenance via the complex formed with ARHGAP17, which acts by regulating the uptake of polarity proteins at tight junctions. Appears to regulate endothelial cell migration and tube formation. May also play a role in the assembly of endothelial cell-cell junctions (1084 aa)

nephronophthisis 4; Involved in the organization of apical junctions in kidney cells together with NPHP1 and RPGRIP1L/NPHP8 (By similarity). Does not seem to be strictly required for ciliogenesis (By similarity) (1426 aa)

crumbs homolog 2 (Drosophila); May play a role in polarized cells morphogenesis (1285 aa)